diff --git a/.github/workflows/build_iar.yml b/.github/workflows/build_iar.yml
new file mode 100644
index 000000000..9c1bfa18a
--- /dev/null
+++ b/.github/workflows/build_iar.yml
@@ -0,0 +1,59 @@
+name: Build IAR
+
+on:
+  push:
+    paths:
+      - 'src/**'
+      - 'examples/**'
+      - 'lib/**'
+      - 'hw/**'
+  pull_request:
+    branches: [ master ]
+    paths:
+      - 'src/**'
+      - 'examples/**'
+      - 'lib/**'
+      - 'hw/**'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  build-arm:
+    runs-on: [self-hosted, Linux, X64, hifiphile]
+    strategy:
+      fail-fast: false
+      matrix:
+        family:
+        # Alphabetical order
+        - 'stm32f0'
+        - 'stm32f1'
+        - 'stm32f4'
+        - 'stm32f7'
+        - 'stm32g4'
+        - 'stm32h7'
+        - 'stm32l4'
+    steps:
+    - name: Clean workspace
+      run: |
+        echo "Cleaning up previous run"
+        rm -rf "${{ github.workspace }}"
+        mkdir -p "${{ github.workspace }}"
+
+    - name: Checkout TinyUSB
+      uses: actions/checkout@v3
+
+    - name: Checkout submodules and dependencies
+      run: |
+        git submodule update --init lib/FreeRTOS-Kernel lib/lwip lib/sct_neopixel
+        python3 tools/get_dependencies.py ${{ matrix.family }}
+
+    - name: Checkout pico-sdk for rp2040
+      if: matrix.family == 'rp2040'
+      run: |
+        git clone --depth 1 -b develop https://github.com/raspberrypi/pico-sdk ~/pico-sdk
+        echo >> $GITHUB_ENV PICO_SDK_PATH=~/pico-sdk
+
+    - name: Build
+      run: python3 tools/build_family.py ${{ matrix.family }} CC=iccarm
diff --git a/examples/device/board_test/Makefile b/examples/device/board_test/Makefile
index b65575ce6..5a455078e 100644
--- a/examples/device/board_test/Makefile
+++ b/examples/device/board_test/Makefile
@@ -9,10 +9,4 @@ INC += \
 EXAMPLE_SOURCE += $(wildcard src/*.c)
 SRC_C += $(addprefix $(CURRENT_PATH)/, $(EXAMPLE_SOURCE))
 
-# board_test example is special example that doesn't enable device or host stack
-# This can cause some TinyUSB API missing, this hack to allow us to fill those API
-# to pass the compilation process
-CFLAGS +=	\
-	-D"tud_int_handler(x)= " \
-
 include ../../rules.mk
diff --git a/examples/device/board_test/src/tusb_config.h b/examples/device/board_test/src/tusb_config.h
index 5aea4fd2c..2c2eb5280 100644
--- a/examples/device/board_test/src/tusb_config.h
+++ b/examples/device/board_test/src/tusb_config.h
@@ -30,6 +30,11 @@
  extern "C" {
 #endif
 
+// board_test example is special example that doesn't enable device or host stack
+// This can cause some TinyUSB API missing, this define hack to allow us to fill those API
+// to pass the compilation process
+#define tud_int_handler(x)
+
 //--------------------------------------------------------------------
 // COMMON CONFIGURATION
 //--------------------------------------------------------------------
diff --git a/examples/device/cdc_msc_freertos/Makefile b/examples/device/cdc_msc_freertos/Makefile
index ff4b41108..4ee816880 100644
--- a/examples/device/cdc_msc_freertos/Makefile
+++ b/examples/device/cdc_msc_freertos/Makefile
@@ -4,13 +4,14 @@ include ../../../tools/top.mk
 include ../../make.mk
 
 FREERTOS_SRC = lib/FreeRTOS-Kernel
+FREERTOS_PORTABLE_SRC= $(FREERTOS_SRC)/portable/$(if $(USE_IAR),IAR,GCC)/$(FREERTOS_PORT)
 
 INC += \
 	src \
 	src/FreeRTOSConfig \
 	$(TOP)/hw \
 	$(TOP)/$(FREERTOS_SRC)/include \
-	$(TOP)/$(FREERTOS_SRC)/portable/GCC/$(FREERTOS_PORT)
+	$(TOP)/$(FREERTOS_PORTABLE_SRC)
 	
 # Example source
 EXAMPLE_SOURCE = \
@@ -27,17 +28,20 @@ SRC_C += \
 	$(FREERTOS_SRC)/queue.c \
 	$(FREERTOS_SRC)/tasks.c \
 	$(FREERTOS_SRC)/timers.c \
-	$(subst ../../../,,$(wildcard ../../../$(FREERTOS_SRC)/portable/GCC/$(FREERTOS_PORT)/*.c))
+	$(subst ../../../,,$(wildcard ../../../$(FREERTOS_PORTABLE_SRC)/*.c))
+
+SRC_S += \
+	$(subst ../../../,,$(wildcard ../../../$(FREERTOS_PORTABLE_SRC)/*.s))
 
 # include heap manage if configSUPPORT_DYNAMIC_ALLOCATION = 1
 # SRC_C += $(FREERTOS_SRC)/portable/MemMang/heap_1.c
 # CFLAGS += -Wno-error=sign-compare
 
 # Suppress FreeRTOSConfig.h warnings
-CFLAGS += -Wno-error=redundant-decls
+GCC_CFLAGS += -Wno-error=redundant-decls
 
 # Suppress FreeRTOS source warnings
-CFLAGS += -Wno-error=cast-qual
+GCC_CFLAGS += -Wno-error=cast-qual
 
 # FreeRTOS (lto + Os) linker issue
 LDFLAGS += -Wl,--undefined=vTaskSwitchContext
diff --git a/examples/device/cdc_msc_freertos/src/FreeRTOSConfig/FreeRTOSConfig.h b/examples/device/cdc_msc_freertos/src/FreeRTOSConfig/FreeRTOSConfig.h
index 968c59749..9bef9bbbf 100644
--- a/examples/device/cdc_msc_freertos/src/FreeRTOSConfig/FreeRTOSConfig.h
+++ b/examples/device/cdc_msc_freertos/src/FreeRTOSConfig/FreeRTOSConfig.h
@@ -42,6 +42,9 @@
  * See http://www.freertos.org/a00110.html.
  *----------------------------------------------------------*/
 
+// skip if included from IAR assembler
+#ifndef __IASMARM__
+
 // Include MCU header
 #include "bsp/board_mcu.h"
 
@@ -57,6 +60,8 @@
   extern uint32_t SystemCoreClock;
 #endif
 
+#endif
+
 /* Cortex M23/M33 port configuration. */
 #define configENABLE_MPU								        0
 #define configENABLE_FPU								        1
@@ -144,10 +149,10 @@
 
 #ifdef __RX__
 /* Renesas RX series */
-#define vSoftwareInterruptISR					INT_Excep_ICU_SWINT
-#define vTickISR								INT_Excep_CMT0_CMI0
-#define configPERIPHERAL_CLOCK_HZ				(configCPU_CLOCK_HZ/2)
-#define configKERNEL_INTERRUPT_PRIORITY			1
+#define vSoftwareInterruptISR					        INT_Excep_ICU_SWINT
+#define vTickISR								              INT_Excep_CMT0_CMI0
+#define configPERIPHERAL_CLOCK_HZ				      (configCPU_CLOCK_HZ/2)
+#define configKERNEL_INTERRUPT_PRIORITY			  1
 #define configMAX_SYSCALL_INTERRUPT_PRIORITY	4
 
 #else
@@ -163,9 +168,18 @@
 #if defined(__NVIC_PRIO_BITS)
   // For Cortex-M specific: __NVIC_PRIO_BITS is defined in core_cmx.h
 	#define configPRIO_BITS       __NVIC_PRIO_BITS
+
 #elif defined(__ECLIC_INTCTLBITS)
   // RISC-V Bumblebee core from nuclei
   #define configPRIO_BITS       __ECLIC_INTCTLBITS
+
+#elif defined(__IASMARM__)
+  // FIXME: IAR Assembler cannot include mcu header directly to get __NVIC_PRIO_BITS.
+  // Therefore we will hard coded it to minimum value of 2 to get pass ci build.
+  // IAR user must update this to correct value of the target MCU
+  #message "configPRIO_BITS is hard coded to 2 to pass IAR build only. User should update it per MCU"
+  #define configPRIO_BITS       2
+
 #else
   #error "FreeRTOS configPRIO_BITS to be defined"
 #endif
diff --git a/examples/device/dfu/Makefile b/examples/device/dfu/Makefile
index 69b633fea..5148ed55a 100644
--- a/examples/device/dfu/Makefile
+++ b/examples/device/dfu/Makefile
@@ -6,7 +6,10 @@ INC += \
 	$(TOP)/hw \
 
 # Example source
-EXAMPLE_SOURCE += $(wildcard src/*.c)
+EXAMPLE_SOURCE = \
+	src/main.c \
+	src/usb_descriptors.c
+
 SRC_C += $(addprefix $(CURRENT_PATH)/, $(EXAMPLE_SOURCE))
 
 include ../../rules.mk
diff --git a/examples/device/hid_composite_freertos/Makefile b/examples/device/hid_composite_freertos/Makefile
index 9c66b896d..a354a90b6 100644
--- a/examples/device/hid_composite_freertos/Makefile
+++ b/examples/device/hid_composite_freertos/Makefile
@@ -4,13 +4,14 @@ include ../../../tools/top.mk
 include ../../make.mk
 
 FREERTOS_SRC = lib/FreeRTOS-Kernel
+FREERTOS_PORTABLE_SRC= $(FREERTOS_SRC)/portable/$(if $(USE_IAR),IAR,GCC)/$(FREERTOS_PORT)
 
 INC += \
 	src \
 	src/FreeRTOSConfig \
 	$(TOP)/hw \
 	$(TOP)/$(FREERTOS_SRC)/include \
-	$(TOP)/$(FREERTOS_SRC)/portable/GCC/$(FREERTOS_PORT)	
+	$(TOP)/$(FREERTOS_PORTABLE_SRC)
 
 # Example source
 EXAMPLE_SOURCE = \
@@ -26,17 +27,20 @@ SRC_C += \
 	$(FREERTOS_SRC)/queue.c \
 	$(FREERTOS_SRC)/tasks.c \
 	$(FREERTOS_SRC)/timers.c \
-	$(subst ../../../,,$(wildcard ../../../$(FREERTOS_SRC)/portable/GCC/$(FREERTOS_PORT)/*.c))
+	$(subst ../../../,,$(wildcard ../../../$(FREERTOS_PORTABLE_SRC)/*.c))
+
+SRC_S += \
+	$(subst ../../../,,$(wildcard ../../../$(FREERTOS_PORTABLE_SRC)/*.s))
 
 # include heap manage if configSUPPORT_DYNAMIC_ALLOCATION = 1
 # SRC_C += $(FREERTOS_SRC)/portable/MemMang/heap_1.c
 # CFLAGS += -Wno-error=sign-compare
 
 # Suppress FreeRTOSConfig.h warnings
-CFLAGS += -Wno-error=redundant-decls
+GCC_CFLAGS += -Wno-error=redundant-decls
 
 # Suppress FreeRTOS source warnings
-CFLAGS += -Wno-error=cast-qual
+GCC_CFLAGS += -Wno-error=cast-qual
 
 # FreeRTOS (lto + Os) linker issue
 LDFLAGS += -Wl,--undefined=vTaskSwitchContext
diff --git a/examples/device/hid_composite_freertos/src/FreeRTOSConfig/FreeRTOSConfig.h b/examples/device/hid_composite_freertos/src/FreeRTOSConfig/FreeRTOSConfig.h
index 968c59749..9bef9bbbf 100644
--- a/examples/device/hid_composite_freertos/src/FreeRTOSConfig/FreeRTOSConfig.h
+++ b/examples/device/hid_composite_freertos/src/FreeRTOSConfig/FreeRTOSConfig.h
@@ -42,6 +42,9 @@
  * See http://www.freertos.org/a00110.html.
  *----------------------------------------------------------*/
 
+// skip if included from IAR assembler
+#ifndef __IASMARM__
+
 // Include MCU header
 #include "bsp/board_mcu.h"
 
@@ -57,6 +60,8 @@
   extern uint32_t SystemCoreClock;
 #endif
 
+#endif
+
 /* Cortex M23/M33 port configuration. */
 #define configENABLE_MPU								        0
 #define configENABLE_FPU								        1
@@ -144,10 +149,10 @@
 
 #ifdef __RX__
 /* Renesas RX series */
-#define vSoftwareInterruptISR					INT_Excep_ICU_SWINT
-#define vTickISR								INT_Excep_CMT0_CMI0
-#define configPERIPHERAL_CLOCK_HZ				(configCPU_CLOCK_HZ/2)
-#define configKERNEL_INTERRUPT_PRIORITY			1
+#define vSoftwareInterruptISR					        INT_Excep_ICU_SWINT
+#define vTickISR								              INT_Excep_CMT0_CMI0
+#define configPERIPHERAL_CLOCK_HZ				      (configCPU_CLOCK_HZ/2)
+#define configKERNEL_INTERRUPT_PRIORITY			  1
 #define configMAX_SYSCALL_INTERRUPT_PRIORITY	4
 
 #else
@@ -163,9 +168,18 @@
 #if defined(__NVIC_PRIO_BITS)
   // For Cortex-M specific: __NVIC_PRIO_BITS is defined in core_cmx.h
 	#define configPRIO_BITS       __NVIC_PRIO_BITS
+
 #elif defined(__ECLIC_INTCTLBITS)
   // RISC-V Bumblebee core from nuclei
   #define configPRIO_BITS       __ECLIC_INTCTLBITS
+
+#elif defined(__IASMARM__)
+  // FIXME: IAR Assembler cannot include mcu header directly to get __NVIC_PRIO_BITS.
+  // Therefore we will hard coded it to minimum value of 2 to get pass ci build.
+  // IAR user must update this to correct value of the target MCU
+  #message "configPRIO_BITS is hard coded to 2 to pass IAR build only. User should update it per MCU"
+  #define configPRIO_BITS       2
+
 #else
   #error "FreeRTOS configPRIO_BITS to be defined"
 #endif
diff --git a/examples/device/net_lwip_webserver/Makefile b/examples/device/net_lwip_webserver/Makefile
index 881866a56..55bd820bd 100644
--- a/examples/device/net_lwip_webserver/Makefile
+++ b/examples/device/net_lwip_webserver/Makefile
@@ -4,7 +4,7 @@ include ../../../tools/top.mk
 include ../../make.mk
 
 # suppress warning caused by lwip
-CFLAGS += \
+GCC_CFLAGS += \
   -Wno-error=null-dereference \
   -Wno-error=unused-parameter \
   -Wno-error=unused-variable
diff --git a/examples/device/net_lwip_webserver/src/arch/bpstruct.h b/examples/device/net_lwip_webserver/src/arch/bpstruct.h
new file mode 100644
index 000000000..74ead358f
--- /dev/null
+++ b/examples/device/net_lwip_webserver/src/arch/bpstruct.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#if defined(__ICCARM__)
+#pragma pack(1)
+#endif
diff --git a/examples/device/net_lwip_webserver/src/arch/epstruct.h b/examples/device/net_lwip_webserver/src/arch/epstruct.h
new file mode 100644
index 000000000..f6390959e
--- /dev/null
+++ b/examples/device/net_lwip_webserver/src/arch/epstruct.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#if defined(__ICCARM__)
+#pragma pack()
+#endif
diff --git a/examples/device/usbtmc/src/usbtmc_app.c b/examples/device/usbtmc/src/usbtmc_app.c
index 8f87a6dca..503ee3071 100644
--- a/examples/device/usbtmc/src/usbtmc_app.c
+++ b/examples/device/usbtmc/src/usbtmc_app.c
@@ -23,7 +23,7 @@
  *
  */
 
-#include <strings.h>
+#include <string.h>
 #include <stdlib.h>     /* atoi */
 #include "tusb.h"
 #include "bsp/board.h"
@@ -148,11 +148,12 @@ bool tud_usbtmc_msg_data_cb(void *data, size_t len, bool transfer_complete)
   queryState = transfer_complete;
   idnQuery = 0;
 
-  if(transfer_complete && (len >=4) && !strncasecmp("*idn?",data,4))
+  if ( transfer_complete && (len >= 4) && (!strncmp("*idn?", data, 4) || !strncmp("*IDN?", data, 4)) )
   {
     idnQuery = 1;
   }
-  if(transfer_complete && !strncasecmp("delay ",data,5))
+
+  if ( transfer_complete && (!strncmp("delay ", data, 5) || !strncmp("DELAY ", data, 5)) )
   {
     queryState = 0;
     int d = atoi((char*)data + 5);
diff --git a/examples/device/video_capture/src/usb_descriptors.c b/examples/device/video_capture/src/usb_descriptors.c
index 499ee311c..0cf772010 100644
--- a/examples/device/video_capture/src/usb_descriptors.c
+++ b/examples/device/video_capture/src/usb_descriptors.c
@@ -99,6 +99,7 @@ uint8_t const desc_fs_configuration[] =
 {
   // Config number, interface count, string index, total length, attribute, power in mA
   TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, 0, 500),
+
   // IAD for Video Control
 #if defined(CFG_EXAMPLE_VIDEO_READONLY) && !defined(CFG_EXAMPLE_VIDEO_DISABLE_MJPEG)
   TUD_VIDEO_CAPTURE_DESCRIPTOR_MJPEG(4, EPNUM_VIDEO_IN,
diff --git a/examples/make.mk b/examples/make.mk
index 73a39a8fe..dd7a5cf4e 100644
--- a/examples/make.mk
+++ b/examples/make.mk
@@ -49,14 +49,31 @@ endif
 #-------------- Cross Compiler  ------------
 # Can be set by board, default to ARM GCC
 CROSS_COMPILE ?= arm-none-eabi-
+
 # Allow for -Os to be changed by board makefiles in case -Os is not allowed
 CFLAGS_OPTIMIZED ?= -Os
 
-CC = $(CROSS_COMPILE)gcc
-CXX = $(CROSS_COMPILE)g++
-GDB = $(CROSS_COMPILE)gdb
-OBJCOPY = $(CROSS_COMPILE)objcopy
-SIZE = $(CROSS_COMPILE)size
+ifeq ($(CC),iccarm)
+USE_IAR = 1
+endif
+
+ifdef USE_IAR
+  AS = iasmarm
+  LD = ilinkarm
+  OBJCOPY = ielftool
+  SIZE = echo "size not available for IAR"
+
+else
+  CC = $(CROSS_COMPILE)gcc
+  CXX = $(CROSS_COMPILE)g++
+  AS = $(CC) -x assembler-with-cpp
+  LD = $(CC)
+  
+  GDB = $(CROSS_COMPILE)gdb
+  OBJCOPY = $(CROSS_COMPILE)objcopy
+  SIZE = $(CROSS_COMPILE)size
+endif
+
 MKDIR = mkdir
 
 ifeq ($(CMDEXE),1)
@@ -78,8 +95,8 @@ SRC_C += $(subst $(TOP)/,,$(wildcard $(TOP)/$(BOARD_PATH)/*.c))
 
 INC   += $(TOP)/$(FAMILY_PATH)
 
-# Compiler Flags
-CFLAGS += \
+# GCC Compiler Flags
+GCC_CFLAGS += \
   -ggdb \
   -fdata-sections \
   -ffunction-sections \
@@ -110,13 +127,13 @@ CFLAGS += \
 
 # conversion is too strict for most mcu driver, may be disable sign/int/arith-conversion
 #  -Wconversion
-  
+
 # Debugging/Optimization
 ifeq ($(DEBUG), 1)
-  CFLAGS += -O0
+  GCC_CFLAGS += -O0
   NO_LTO = 1
 else
-  CFLAGS += $(CFLAGS_OPTIMIZED)
+  GCC_CFLAGS += $(CFLAGS_OPTIMIZED)
 endif
 
 # Log level is mapped to TUSB DEBUG option
diff --git a/examples/rules.mk b/examples/rules.mk
index c3134056a..6a62288ce 100644
--- a/examples/rules.mk
+++ b/examples/rules.mk
@@ -46,23 +46,51 @@ INC += $(TOP)/src
 
 CFLAGS += $(addprefix -I,$(INC))
 
+ifdef USE_IAR
+
+SRC_S += $(IAR_SRC_S)
+
+ASFLAGS := $(CFLAGS) $(IAR_ASFLAGS) $(ASFLAGS) -S
+IAR_LDFLAGS += --config $(TOP)/$(IAR_LD_FILE)
+CFLAGS += $(IAR_CFLAGS) -e --debug --silent
+
+else
+
+SRC_S += $(GCC_SRC_S)
+
+CFLAGS += $(GCC_CFLAGS) -MD
+
 # LTO makes it difficult to analyze map file for optimizing size purpose
 # We will run this option in ci
 ifeq ($(NO_LTO),1)
 CFLAGS := $(filter-out -flto,$(CFLAGS))
 endif
 
-ifneq ($(LD_FILE),)
-LDFLAGS_LD_FILE ?= -Wl,-T,$(TOP)/$(LD_FILE)
+LDFLAGS += $(CFLAGS) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections
+
+ifdef LD_FILE
+LDFLAGS += -Wl,-T,$(TOP)/$(LD_FILE)
+endif
+
+ifdef GCC_LD_FILE
+LDFLAGS += -Wl,-T,$(TOP)/$(GCC_LD_FILE)
 endif
 
-LDFLAGS += $(CFLAGS) $(LDFLAGS_LD_FILE) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections
 ifneq ($(SKIP_NANOLIB), 1)
 LDFLAGS += -specs=nosys.specs -specs=nano.specs
 endif
 
 ASFLAGS += $(CFLAGS)
 
+endif # USE_IAR
+
+# Verbose mode
+ifeq ("$(V)","1")
+$(info CFLAGS  $(CFLAGS) ) $(info )
+$(info LDFLAGS $(LDFLAGS)) $(info )
+$(info ASFLAGS $(ASFLAGS)) $(info )
+endif
+
 # Assembly files can be name with upper case .S, convert it to .s
 SRC_S := $(SRC_S:.S=.s)
 
@@ -72,13 +100,6 @@ SRC_S := $(SRC_S:.S=.s)
 OBJ += $(addprefix $(BUILD)/obj/, $(SRC_S:.s=_asm.o))
 OBJ += $(addprefix $(BUILD)/obj/, $(SRC_C:.c=.o))
 
-# Verbose mode
-ifeq ("$(V)","1")
-$(info CFLAGS  $(CFLAGS) ) $(info )
-$(info LDFLAGS $(LDFLAGS)) $(info )
-$(info ASFLAGS $(ASFLAGS)) $(info )
-endif
-
 # ---------------------------------------
 # Rules
 # ---------------------------------------
@@ -96,10 +117,30 @@ else
 	@$(MKDIR) -p $@
 endif
 
-$(BUILD)/$(PROJECT).elf: $(OBJ)
-	@echo LINK $@
-	@$(CC) -o $@ $(LDFLAGS) $^ -Wl,--start-group $(LIBS) -Wl,--end-group
+# We set vpath to point to the top of the tree so that the source files
+# can be located. By following this scheme, it allows a single build rule
+# to be used to compile all .c files.
+vpath %.c . $(TOP)
+vpath %.s . $(TOP)
+vpath %.S . $(TOP)
 
+# Compile .c file
+$(BUILD)/obj/%.o: %.c
+	@echo CC $(notdir $@)
+	@$(CC) $(CFLAGS) -c -o $@ $<
+
+# ASM sources lower case .s
+$(BUILD)/obj/%_asm.o: %.s
+	@echo AS $(notdir $@)
+	@$(AS) $(ASFLAGS) -c -o $@ $<
+
+# ASM sources upper case .S
+$(BUILD)/obj/%_asm.o: %.S
+	@echo AS $(notdir $@)
+	@$(AS) $(ASFLAGS) -c -o $@ $<
+
+ifndef USE_IAR
+# GCC based compiler
 $(BUILD)/$(PROJECT).bin: $(BUILD)/$(PROJECT).elf
 	@echo CREATE $@
 	@$(OBJCOPY) -O binary $^ $@
@@ -108,6 +149,26 @@ $(BUILD)/$(PROJECT).hex: $(BUILD)/$(PROJECT).elf
 	@echo CREATE $@
 	@$(OBJCOPY) -O ihex $^ $@
 
+$(BUILD)/$(PROJECT).elf: $(OBJ)
+	@echo LINK $@
+	@$(LD) -o $@ $(LDFLAGS) $^ -Wl,--start-group $(LIBS) -Wl,--end-group
+
+else
+
+# IAR Compiler
+$(BUILD)/$(PROJECT).bin: $(BUILD)/$(PROJECT).elf
+	@echo CREATE $@
+	@$(OBJCOPY) --silent --bin $^ $@
+
+$(BUILD)/$(PROJECT).hex: $(BUILD)/$(PROJECT).elf
+	@echo CREATE $@
+	@$(OBJCOPY) --silent --ihex $^ $@
+
+$(BUILD)/$(PROJECT).elf: $(OBJ)
+	@echo LINK $@
+	@$(LD) -o $@ $(IAR_LDFLAGS) $^
+endif
+
 # UF2 generation, iMXRT need to strip to text only before conversion
 ifeq ($(FAMILY),imxrt)
 $(BUILD)/$(PROJECT).uf2: $(BUILD)/$(PROJECT).elf
@@ -122,27 +183,8 @@ endif
 
 copy-artifact: $(BUILD)/$(PROJECT).bin $(BUILD)/$(PROJECT).hex $(BUILD)/$(PROJECT).uf2
 
-# We set vpath to point to the top of the tree so that the source files
-# can be located. By following this scheme, it allows a single build rule
-# to be used to compile all .c files.
-vpath %.c . $(TOP)
-$(BUILD)/obj/%.o: %.c
-	@echo CC $(notdir $@)
-	@$(CC) $(CFLAGS) -c -MD -o $@ $<
-
-# ASM sources lower case .s
-vpath %.s . $(TOP)
-$(BUILD)/obj/%_asm.o: %.s
-	@echo AS $(notdir $@)
-	@$(CC) -x assembler-with-cpp $(ASFLAGS) -c -o $@ $<
-
-# ASM sources upper case .S
-vpath %.S . $(TOP)
-$(BUILD)/obj/%_asm.o: %.S
-	@echo AS $(notdir $@)
-	@$(CC) -x assembler-with-cpp $(ASFLAGS) -c -o $@ $<
-
 endif
+# ---------------- GNU Make End -----------------------
 
 .PHONY: clean
 clean:
@@ -151,7 +193,6 @@ ifeq ($(CMDEXE),1)
 else
 	$(RM) -rf $(BUILD)
 endif
-# ---------------- GNU Make End -----------------------
 
 # get depenecies
 .PHONY: get-deps
diff --git a/hw/bsp/board.c b/hw/bsp/board.c
index 7e96735bd..14858c2b6 100644
--- a/hw/bsp/board.c
+++ b/hw/bsp/board.c
@@ -77,8 +77,10 @@ void board_led_task(void)
 //--------------------------------------------------------------------+
 // newlib read()/write() retarget
 //--------------------------------------------------------------------+
-
-#if defined(__MSP430__) || defined(__RX__)
+#ifdef __ICCARM__
+  #define sys_write   __write
+  #define sys_read    __read
+#elif defined(__MSP430__) || defined(__RX__)
   #define sys_write   write
   #define sys_read    read
 #else
diff --git a/hw/bsp/stm32f0/boards/stm32f070rbnucleo/board.mk b/hw/bsp/stm32f0/boards/stm32f070rbnucleo/board.mk
index 7c0ee40b6..cf787a103 100644
--- a/hw/bsp/stm32f0/boards/stm32f070rbnucleo/board.mk
+++ b/hw/bsp/stm32f0/boards/stm32f070rbnucleo/board.mk
@@ -1,11 +1,15 @@
 CFLAGS += -DSTM32F070xB -DCFG_EXAMPLE_VIDEO_READONLY
 
-LD_FILE = $(BOARD_PATH)/stm32F070rbtx_flash.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f070xb.s
+GCC_LD_FILE = $(BOARD_PATH)/stm32F070rbtx_flash.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f070xb.s
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f070xb.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f070xb_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f070rb
 
 # flash target using on-board stlink
-flash: flash-stlink
+flash: flash-stlink
\ No newline at end of file
diff --git a/hw/bsp/stm32f0/boards/stm32f072disco/board.mk b/hw/bsp/stm32f0/boards/stm32f072disco/board.mk
index 7c72d8f4c..4216ba186 100644
--- a/hw/bsp/stm32f0/boards/stm32f072disco/board.mk
+++ b/hw/bsp/stm32f0/boards/stm32f072disco/board.mk
@@ -1,8 +1,10 @@
 CFLAGS += -DSTM32F072xB -DCFG_EXAMPLE_VIDEO_READONLY
 
-LD_FILE = $(BOARD_PATH)/STM32F072RBTx_FLASH.ld
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f072xb.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32F072RBTx_FLASH.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f072xb.s
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f072xb.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f072xb_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f072rb
diff --git a/hw/bsp/stm32f0/boards/stm32f072eval/board.mk b/hw/bsp/stm32f0/boards/stm32f072eval/board.mk
index b625c3ebd..bb9cba22a 100644
--- a/hw/bsp/stm32f0/boards/stm32f072eval/board.mk
+++ b/hw/bsp/stm32f0/boards/stm32f072eval/board.mk
@@ -1,8 +1,10 @@
 CFLAGS += -DSTM32F072xB -DLSI_VALUE=40000 -DCFG_EXAMPLE_VIDEO_READONLY
 
-LD_FILE = $(BOARD_PATH)/STM32F072VBTx_FLASH.ld
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f072xb.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32F072VBTx_FLASH.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f072xb.s
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f072xb.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f072xb_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f072vb
diff --git a/hw/bsp/stm32f0/family.c b/hw/bsp/stm32f0/family.c
index 8de3147e2..a7e914128 100644
--- a/hw/bsp/stm32f0/family.c
+++ b/hw/bsp/stm32f0/family.c
@@ -118,7 +118,8 @@ void board_init(void)
 
 void board_led_write(bool state)
 {
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
+  GPIO_PinState pin_state = (GPIO_PinState) (state ? LED_STATE_ON : (1-LED_STATE_ON));
+  HAL_GPIO_WritePin(LED_PORT, LED_PIN, pin_state);
 }
 
 uint32_t board_button_read(void)
@@ -153,7 +154,7 @@ uint32_t board_millis(void)
 
 void HardFault_Handler (void)
 {
-  asm("bkpt");
+   __asm("BKPT #0\n");
 }
 
 #ifdef  USE_FULL_ASSERT
diff --git a/hw/bsp/stm32f0/family.mk b/hw/bsp/stm32f0/family.mk
index 39831e154..2983af49e 100644
--- a/hw/bsp/stm32f0/family.mk
+++ b/hw/bsp/stm32f0/family.mk
@@ -7,18 +7,32 @@ ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
 
 include $(TOP)/$(BOARD_PATH)/board.mk
 
+# --------------
+# Compiler Flags
+# --------------
 CFLAGS += \
+  -DCFG_EXAMPLE_MSC_READONLY \
+  -DCFG_TUSB_MCU=OPT_MCU_STM32F0
+
+# GCC Flags
+GCC_CFLAGS += \
   -flto \
   -mthumb \
   -mabi=aapcs \
   -mcpu=cortex-m0 \
   -mfloat-abi=soft \
   -nostdlib -nostartfiles \
-  -DCFG_EXAMPLE_MSC_READONLY \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32F0
 
 # suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=unused-parameter -Wno-error=cast-align -Wno-error=cast-qual
+GCC_CFLAGS += -Wno-error=unused-parameter -Wno-error=cast-align -Wno-error=cast-qual
+
+# IAR Flags
+IAR_CFLAGS += --cpu cortex-m0
+IAR_ASFLAGS += --cpu cortex-m0
+
+# ------------------------
+# All source paths should be relative to the top level.
+# ------------------------
 
 SRC_C += \
   src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c \
diff --git a/hw/bsp/stm32f1/boards/stm32f103_bluepill/board.mk b/hw/bsp/stm32f1/boards/stm32f103_bluepill/board.mk
index db64b3a3f..159b3ecb6 100644
--- a/hw/bsp/stm32f1/boards/stm32f103_bluepill/board.mk
+++ b/hw/bsp/stm32f1/boards/stm32f103_bluepill/board.mk
@@ -1,8 +1,12 @@
 CFLAGS += -DSTM32F103xB -DHSE_VALUE=8000000U -DCFG_EXAMPLE_VIDEO_READONLY
 
-# All source paths should be relative to the top level.
-LD_FILE = $(BOARD_PATH)/STM32F103X8_FLASH.ld
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f103xb.s
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f103xb.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32F103X8_FLASH.ld
+
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f103xb.s
+IAR_LD_FILE = $(BOARD_PATH)/stm32f103x8_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f103c8
diff --git a/hw/bsp/stm32f1/boards/stm32f103_bluepill/stm32f103x8_flash.icf b/hw/bsp/stm32f1/boards/stm32f103_bluepill/stm32f103x8_flash.icf
new file mode 100644
index 000000000..07601c2e8
--- /dev/null
+++ b/hw/bsp/stm32f1/boards/stm32f103_bluepill/stm32f103x8_flash.icf
@@ -0,0 +1,31 @@
+/*###ICF### Section handled by ICF editor, don't touch! ****/
+/*-Editor annotation file-*/
+/* IcfEditorFile="$TOOLKIT_DIR$\config\ide\IcfEditor\cortex_v1_0.xml" */
+/*-Specials-*/
+define symbol __ICFEDIT_intvec_start__ = 0x08000000;
+/*-Memory Regions-*/
+define symbol __ICFEDIT_region_ROM_start__   = 0x08000000 ;
+define symbol __ICFEDIT_region_ROM_end__     = 0x0800FFFF;
+define symbol __ICFEDIT_region_RAM_start__   = 0x20000000;
+define symbol __ICFEDIT_region_RAM_end__     = 0x20004FFF;
+/*-Sizes-*/
+define symbol __ICFEDIT_size_cstack__   = 0x400;
+define symbol __ICFEDIT_size_heap__     = 0x200;
+/**** End of ICF editor section. ###ICF###*/
+
+
+define memory mem with size = 4G;
+define region ROM_region   = mem:[from __ICFEDIT_region_ROM_start__   to __ICFEDIT_region_ROM_end__];
+define region RAM_region   = mem:[from __ICFEDIT_region_RAM_start__   to __ICFEDIT_region_RAM_end__];
+
+define block CSTACK    with alignment = 8, size = __ICFEDIT_size_cstack__   { };
+define block HEAP      with alignment = 8, size = __ICFEDIT_size_heap__     { };
+
+initialize by copy { readwrite };
+do not initialize  { section .noinit };
+
+place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };
+
+place in ROM_region   { readonly };
+place in RAM_region   { readwrite,
+                        block CSTACK, block HEAP };
diff --git a/hw/bsp/stm32f1/boards/stm32f103_mini_2/board.mk b/hw/bsp/stm32f1/boards/stm32f103_mini_2/board.mk
index eeda87080..efea75be7 100644
--- a/hw/bsp/stm32f1/boards/stm32f103_mini_2/board.mk
+++ b/hw/bsp/stm32f1/boards/stm32f103_mini_2/board.mk
@@ -1,8 +1,12 @@
 CFLAGS += -DSTM32F103xB -DHSE_VALUE=8000000U
 
-# All source paths should be relative to the top level.
-LD_FILE = $(BOARD_PATH)/STM32F103XC_FLASH.ld
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f103xb.s
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f103xb.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32F103XC_FLASH.ld
+
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f103xb.s
+IAR_LD_FILE = $(BOARD_PATH)/stm32f103xc_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f103rc
diff --git a/hw/bsp/stm32f1/boards/stm32f103_mini_2/stm32f103xc_flash.icf b/hw/bsp/stm32f1/boards/stm32f103_mini_2/stm32f103xc_flash.icf
new file mode 100644
index 000000000..5f8a5ecad
--- /dev/null
+++ b/hw/bsp/stm32f1/boards/stm32f103_mini_2/stm32f103xc_flash.icf
@@ -0,0 +1,31 @@
+/*###ICF### Section handled by ICF editor, don't touch! ****/
+/*-Editor annotation file-*/
+/* IcfEditorFile="$TOOLKIT_DIR$\config\ide\IcfEditor\cortex_v1_0.xml" */
+/*-Specials-*/
+define symbol __ICFEDIT_intvec_start__ = 0x08000000;
+/*-Memory Regions-*/
+define symbol __ICFEDIT_region_ROM_start__   = 0x08000000 ;
+define symbol __ICFEDIT_region_ROM_end__     = 0x0803FFFF;
+define symbol __ICFEDIT_region_RAM_start__   = 0x20000000;
+define symbol __ICFEDIT_region_RAM_end__     = 0x2000BFFF;
+/*-Sizes-*/
+define symbol __ICFEDIT_size_cstack__   = 0x400;
+define symbol __ICFEDIT_size_heap__     = 0x200;
+/**** End of ICF editor section. ###ICF###*/
+
+
+define memory mem with size = 4G;
+define region ROM_region   = mem:[from __ICFEDIT_region_ROM_start__   to __ICFEDIT_region_ROM_end__];
+define region RAM_region   = mem:[from __ICFEDIT_region_RAM_start__   to __ICFEDIT_region_RAM_end__];
+
+define block CSTACK    with alignment = 8, size = __ICFEDIT_size_cstack__   { };
+define block HEAP      with alignment = 8, size = __ICFEDIT_size_heap__     { };
+
+initialize by copy { readwrite };
+do not initialize  { section .noinit };
+
+place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };
+
+place in ROM_region   { readonly };
+place in RAM_region   { readwrite,
+                        block CSTACK, block HEAP };
diff --git a/hw/bsp/stm32f1/family.c b/hw/bsp/stm32f1/family.c
index 8fcf9ebd6..246d496c8 100644
--- a/hw/bsp/stm32f1/family.c
+++ b/hw/bsp/stm32f1/family.c
@@ -104,7 +104,8 @@ void board_init(void)
 
 void board_led_write(bool state)
 {
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
+  GPIO_PinState pin_state = (GPIO_PinState) (state ? LED_STATE_ON : (1-LED_STATE_ON));
+  HAL_GPIO_WritePin(LED_PORT, LED_PIN, pin_state);
 }
 
 uint32_t board_button_read(void)
@@ -139,7 +140,7 @@ uint32_t board_millis(void)
 
 void HardFault_Handler (void)
 {
-  asm("bkpt");
+  __asm("BKPT #0\n");
 }
 
 #ifdef  USE_FULL_ASSERT
diff --git a/hw/bsp/stm32f1/family.mk b/hw/bsp/stm32f1/family.mk
index 3fb2e6e70..4327f1cf8 100644
--- a/hw/bsp/stm32f1/family.mk
+++ b/hw/bsp/stm32f1/family.mk
@@ -6,19 +6,28 @@ ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
 
 include $(TOP)/$(BOARD_PATH)/board.mk
 
+# --------------
+# Compiler Flags
+# --------------
 CFLAGS += \
+  -DCFG_TUSB_MCU=OPT_MCU_STM32F1
+
+# GCC Flags
+GCC_CFLAGS += \
   -flto \
   -mthumb \
   -mabi=aapcs \
   -mcpu=cortex-m3 \
   -mfloat-abi=soft \
   -nostdlib -nostartfiles \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32F1
 
-# mcu driver cause following warnings
-#CFLAGS += -Wno-error=unused-parameter
+# IAR Flags
+IAR_CFLAGS += --cpu cortex-m3
+IAR_ASFLAGS += --cpu cortex-m3
 
+# ------------------------
 # All source paths should be relative to the top level.
+# ------------------------
 SRC_C += \
   src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c \
   $(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \
diff --git a/hw/bsp/stm32f4/boards/feather_stm32f405/board.mk b/hw/bsp/stm32f4/boards/feather_stm32f405/board.mk
index 1de56fe5a..1962dd9d8 100644
--- a/hw/bsp/stm32f4/boards/feather_stm32f405/board.mk
+++ b/hw/bsp/stm32f4/boards/feather_stm32f405/board.mk
@@ -1,8 +1,12 @@
 CFLAGS += -DSTM32F405xx
 
-LD_FILE = $(BOARD_PATH)/STM32F405RGTx_FLASH.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f405xx.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32F405RGTx_FLASH.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f405xx.s
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f405xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f405xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f405rg
diff --git a/hw/bsp/stm32f4/boards/pyboardv11/board.mk b/hw/bsp/stm32f4/boards/pyboardv11/board.mk
index 02dcd1219..0a9100e1e 100644
--- a/hw/bsp/stm32f4/boards/pyboardv11/board.mk
+++ b/hw/bsp/stm32f4/boards/pyboardv11/board.mk
@@ -1,8 +1,12 @@
 CFLAGS += -DSTM32F405xx
 
-LD_FILE = $(BOARD_PATH)/STM32F405RGTx_FLASH.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f405xx.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32F405RGTx_FLASH.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f405xx.s
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f405xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f405xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f405rg
diff --git a/hw/bsp/stm32f4/boards/stm32f401blackpill/board.mk b/hw/bsp/stm32f4/boards/stm32f401blackpill/board.mk
index de0f3d4c7..11f9b81aa 100644
--- a/hw/bsp/stm32f4/boards/stm32f401blackpill/board.mk
+++ b/hw/bsp/stm32f4/boards/stm32f401blackpill/board.mk
@@ -1,8 +1,12 @@
 CFLAGS += -DSTM32F401xC
 
-LD_FILE = $(BOARD_PATH)/STM32F401VCTx_FLASH.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f401xc.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32F401VCTx_FLASH.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f401xc.s
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f401xc.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f401xc_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f401cc
diff --git a/hw/bsp/stm32f4/boards/stm32f407disco/board.mk b/hw/bsp/stm32f4/boards/stm32f407disco/board.mk
index 212b924b4..a184804d3 100644
--- a/hw/bsp/stm32f4/boards/stm32f407disco/board.mk
+++ b/hw/bsp/stm32f4/boards/stm32f407disco/board.mk
@@ -1,8 +1,13 @@
 CFLAGS += -DSTM32F407xx
 
-LD_FILE = $(BOARD_PATH)/STM32F407VGTx_FLASH.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f407xx.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32F407VGTx_FLASH.ld
+
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f407xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f407xx_flash.icf
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f407xx.s
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f407vg
diff --git a/hw/bsp/stm32f4/boards/stm32f411blackpill/board.mk b/hw/bsp/stm32f4/boards/stm32f411blackpill/board.mk
index 78be4348a..ac15eaa5d 100644
--- a/hw/bsp/stm32f4/boards/stm32f411blackpill/board.mk
+++ b/hw/bsp/stm32f4/boards/stm32f411blackpill/board.mk
@@ -1,8 +1,12 @@
 CFLAGS += -DSTM32F411xE
 
-LD_FILE = $(BOARD_PATH)/STM32F411CEUx_FLASH.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f411xe.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32F411CEUx_FLASH.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f411xe.s
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f411xe.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f411xe_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f411ce
diff --git a/hw/bsp/stm32f4/boards/stm32f411disco/board.mk b/hw/bsp/stm32f4/boards/stm32f411disco/board.mk
index 48272acff..c5736050c 100644
--- a/hw/bsp/stm32f4/boards/stm32f411disco/board.mk
+++ b/hw/bsp/stm32f4/boards/stm32f411disco/board.mk
@@ -1,8 +1,12 @@
 CFLAGS += -DSTM32F411xE
 
-LD_FILE = $(BOARD_PATH)/STM32F411VETx_FLASH.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f411xe.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32F411VETx_FLASH.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f411xe.s
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f411xe.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f411xe_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f411ve
diff --git a/hw/bsp/stm32f4/boards/stm32f412disco/board.mk b/hw/bsp/stm32f4/boards/stm32f412disco/board.mk
index 50973f737..7dc3699e0 100644
--- a/hw/bsp/stm32f4/boards/stm32f412disco/board.mk
+++ b/hw/bsp/stm32f4/boards/stm32f412disco/board.mk
@@ -1,8 +1,12 @@
 CFLAGS += -DSTM32F412Zx
 
-LD_FILE = $(BOARD_PATH)/STM32F412ZGTx_FLASH.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f412zx.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32F412ZGTx_FLASH.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f412zx.s
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f412zx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f412zx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f412zg
diff --git a/hw/bsp/stm32f4/boards/stm32f412nucleo/board.mk b/hw/bsp/stm32f4/boards/stm32f412nucleo/board.mk
index 50973f737..7dc3699e0 100644
--- a/hw/bsp/stm32f4/boards/stm32f412nucleo/board.mk
+++ b/hw/bsp/stm32f4/boards/stm32f412nucleo/board.mk
@@ -1,8 +1,12 @@
 CFLAGS += -DSTM32F412Zx
 
-LD_FILE = $(BOARD_PATH)/STM32F412ZGTx_FLASH.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f412zx.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32F412ZGTx_FLASH.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f412zx.s
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f412zx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f412zx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f412zg
diff --git a/hw/bsp/stm32f4/boards/stm32f439nucleo/board.mk b/hw/bsp/stm32f4/boards/stm32f439nucleo/board.mk
index b7b36a8a6..e1f337a7e 100644
--- a/hw/bsp/stm32f4/boards/stm32f439nucleo/board.mk
+++ b/hw/bsp/stm32f4/boards/stm32f439nucleo/board.mk
@@ -1,8 +1,12 @@
 CFLAGS += -DSTM32F439xx
 
-LD_FILE = $(BOARD_PATH)/STM32F439ZITX_FLASH.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f439xx.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32F439ZITX_FLASH.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f439xx.s
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f439xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f439xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f439zi
diff --git a/hw/bsp/stm32f4/family.c b/hw/bsp/stm32f4/family.c
index 82d4957e7..674058f50 100644
--- a/hw/bsp/stm32f4/family.c
+++ b/hw/bsp/stm32f4/family.c
@@ -150,7 +150,8 @@ void board_init(void)
 
 void board_led_write(bool state)
 {
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
+  GPIO_PinState pin_state = (GPIO_PinState) (state ? LED_STATE_ON : (1-LED_STATE_ON));
+  HAL_GPIO_WritePin(LED_PORT, LED_PIN, pin_state);
 }
 
 uint32_t board_button_read(void)
@@ -190,7 +191,7 @@ uint32_t board_millis(void)
 
 void HardFault_Handler (void)
 {
-  asm("bkpt");
+  __asm("BKPT #0\n");
 }
 
 // Required by __libc_init_array in startup code if we are compiling using
diff --git a/hw/bsp/stm32f4/family.mk b/hw/bsp/stm32f4/family.mk
index 9811d3371..e8352bad7 100644
--- a/hw/bsp/stm32f4/family.mk
+++ b/hw/bsp/stm32f4/family.mk
@@ -7,18 +7,32 @@ ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
 
 include $(TOP)/$(BOARD_PATH)/board.mk
 
+# --------------
+# Compiler Flags
+# --------------
 CFLAGS += \
+  -DCFG_TUSB_MCU=OPT_MCU_STM32F4
+
+# GCC Flags
+GCC_CFLAGS += \
   -flto \
   -mthumb \
   -mabi=aapcs \
   -mcpu=cortex-m4 \
   -mfloat-abi=hard \
   -mfpu=fpv4-sp-d16 \
-  -nostdlib -nostartfiles \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32F4
+  -nostdlib -nostartfiles
 
 # suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=cast-align
+GCC_CFLAGS += -Wno-error=cast-align
+
+# IAR Flags
+IAR_CFLAGS += --cpu cortex-m4 --fpu VFPv4
+IAR_ASFLAGS += --cpu cortex-m4 --fpu VFPv4
+
+# -----------------
+# Sources & Include
+# -----------------
 
 SRC_C += \
 	src/portable/synopsys/dwc2/dcd_dwc2.c \
diff --git a/hw/bsp/stm32f7/boards/stlinkv3mini/board.mk b/hw/bsp/stm32f7/boards/stlinkv3mini/board.mk
index a18b3231d..e1d352cc9 100644
--- a/hw/bsp/stm32f7/boards/stlinkv3mini/board.mk
+++ b/hw/bsp/stm32f7/boards/stlinkv3mini/board.mk
@@ -6,9 +6,13 @@ CFLAGS += \
   -DSTM32F723xx \
   -DHSE_VALUE=25000000 \
 
-# All source paths should be relative to the top level.
-LD_FILE = $(BOARD_PATH)/STM32F723xE_FLASH.ld
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f723xx.s
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f723xx.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32F723xE_FLASH.ld
+
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f723xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f723xx_flash.icf
 
 # flash target using on-board stlink
 flash: flash-stlink
diff --git a/hw/bsp/stm32f7/boards/stm32f723disco/board.mk b/hw/bsp/stm32f7/boards/stm32f723disco/board.mk
index 66d9ff8fb..6ddb727c7 100644
--- a/hw/bsp/stm32f7/boards/stm32f723disco/board.mk
+++ b/hw/bsp/stm32f7/boards/stm32f723disco/board.mk
@@ -5,8 +5,13 @@ CFLAGS += \
   -DSTM32F723xx \
   -DHSE_VALUE=25000000 \
 
-LD_FILE = $(BOARD_PATH)/STM32F723xE_FLASH.ld
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f723xx.s
+# GCC
+GCC_LD_FILE = $(BOARD_PATH)/STM32F723xE_FLASH.ld
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f723xx.s
+
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f723xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f723xx_flash.icf
 
 # flash target using on-board stlink
 flash: flash-stlink
diff --git a/hw/bsp/stm32f7/boards/stm32f746disco/board.mk b/hw/bsp/stm32f7/boards/stm32f746disco/board.mk
index 2ba59f67a..ba31baa16 100644
--- a/hw/bsp/stm32f7/boards/stm32f746disco/board.mk
+++ b/hw/bsp/stm32f7/boards/stm32f746disco/board.mk
@@ -5,8 +5,13 @@ CFLAGS += \
   -DSTM32F746xx \
   -DHSE_VALUE=25000000
 
-LD_FILE = $(BOARD_PATH)/STM32F746ZGTx_FLASH.ld
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f746xx.s
+# GCC
+GCC_LD_FILE = $(BOARD_PATH)/STM32F746ZGTx_FLASH.ld
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f746xx.s
+
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f746xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f746xx_flash.icf
 
 # flash target using on-board stlink
 flash: flash-stlink
diff --git a/hw/bsp/stm32f7/boards/stm32f746nucleo/board.mk b/hw/bsp/stm32f7/boards/stm32f746nucleo/board.mk
index 3dcf4817e..e4d31040e 100644
--- a/hw/bsp/stm32f7/boards/stm32f746nucleo/board.mk
+++ b/hw/bsp/stm32f7/boards/stm32f746nucleo/board.mk
@@ -5,8 +5,13 @@ CFLAGS += \
   -DSTM32F746xx \
   -DHSE_VALUE=8000000
 
-LD_FILE = $(BOARD_PATH)/STM32F746ZGTx_FLASH.ld
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f746xx.s
+# GCC
+GCC_LD_FILE = $(BOARD_PATH)/STM32F746ZGTx_FLASH.ld
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f746xx.s
+
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f746xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f746xx_flash.icf
 
 # flash target using on-board stlink
 flash: flash-stlink
diff --git a/hw/bsp/stm32f7/boards/stm32f767nucleo/board.mk b/hw/bsp/stm32f7/boards/stm32f767nucleo/board.mk
index 7710619e5..a460245b2 100644
--- a/hw/bsp/stm32f7/boards/stm32f767nucleo/board.mk
+++ b/hw/bsp/stm32f7/boards/stm32f767nucleo/board.mk
@@ -5,8 +5,13 @@ CFLAGS += \
   -DSTM32F767xx \
 	-DHSE_VALUE=8000000 \
 
-LD_FILE = $(BOARD_PATH)/STM32F767ZITx_FLASH.ld
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f767xx.s
+# GCC
+GCC_LD_FILE = $(BOARD_PATH)/STM32F767ZITx_FLASH.ld
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f767xx.s
+
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f767xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f767xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f767zi
diff --git a/hw/bsp/stm32f7/boards/stm32f769disco/board.mk b/hw/bsp/stm32f7/boards/stm32f769disco/board.mk
index 45b4a78c7..18f59e8b2 100644
--- a/hw/bsp/stm32f7/boards/stm32f769disco/board.mk
+++ b/hw/bsp/stm32f7/boards/stm32f769disco/board.mk
@@ -6,8 +6,13 @@ CFLAGS += \
   -DSTM32F769xx \
   -DHSE_VALUE=25000000 \
 
-LD_FILE = $(BOARD_PATH)/STM32F769ZITx_FLASH.ld
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f769xx.s
+# GCC
+GCC_LD_FILE = $(BOARD_PATH)/STM32F769ZITx_FLASH.ld
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f769xx.s
+
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f769xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f769xx_flash.icf
 
 # flash target using on-board stlink
 flash: flash-stlink
diff --git a/hw/bsp/stm32f7/family.c b/hw/bsp/stm32f7/family.c
index 425e6e1bc..536eb0554 100644
--- a/hw/bsp/stm32f7/family.c
+++ b/hw/bsp/stm32f7/family.c
@@ -268,7 +268,8 @@ void board_init(void)
 
 void board_led_write(bool state)
 {
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
+  GPIO_PinState pin_state = (GPIO_PinState) (state ? LED_STATE_ON : (1-LED_STATE_ON));
+  HAL_GPIO_WritePin(LED_PORT, LED_PIN, pin_state);
 }
 
 uint32_t board_button_read(void)
@@ -303,7 +304,7 @@ uint32_t board_millis(void)
 
 void HardFault_Handler (void)
 {
-  asm("bkpt");
+  __asm("BKPT #0\n");
 }
 
 // Required by __libc_init_array in startup code if we are compiling using
diff --git a/hw/bsp/stm32f7/family.mk b/hw/bsp/stm32f7/family.mk
index b8a5d7ead..781b8bb18 100644
--- a/hw/bsp/stm32f7/family.mk
+++ b/hw/bsp/stm32f7/family.mk
@@ -7,14 +7,10 @@ ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
 
 include $(TOP)/$(BOARD_PATH)/board.mk
 
+# --------------
+# Compiler Flags
+# --------------
 CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m7 \
-  -mfloat-abi=hard \
-  -mfpu=fpv5-d16 \
-  -nostdlib -nostartfiles \
   -DCFG_TUSB_MCU=OPT_MCU_STM32F7 \
   -DBOARD_TUD_RHPORT=$(PORT)
 
@@ -30,8 +26,26 @@ else
   $(info "Using OTG_FS")
 endif
 
+# GCC Flags
+GCC_CFLAGS += \
+  -flto \
+  -mthumb \
+  -mabi=aapcs \
+  -mcpu=cortex-m7 \
+  -mfloat-abi=hard \
+  -mfpu=fpv5-d16 \
+  -nostdlib -nostartfiles
+
 # mcu driver cause following warnings
-CFLAGS += -Wno-error=shadow -Wno-error=cast-align
+GCC_CFLAGS += -Wno-error=shadow -Wno-error=cast-align
+
+# IAR Flags
+IAR_CFLAGS += --cpu cortex-m7 --fpu VFPv5_D16
+IAR_ASFLAGS += --cpu cortex-m7 --fpu VFPv5_D16
+
+# -----------------
+# Sources & Include
+# -----------------
 
 SRC_C += \
 	src/portable/synopsys/dwc2/dcd_dwc2.c \
diff --git a/hw/bsp/stm32g4/boards/stm32g474nucleo/board.mk b/hw/bsp/stm32g4/boards/stm32g474nucleo/board.mk
index e41edd3b7..2f6ec0ed6 100644
--- a/hw/bsp/stm32g4/boards/stm32g474nucleo/board.mk
+++ b/hw/bsp/stm32g4/boards/stm32g474nucleo/board.mk
@@ -2,9 +2,13 @@ CFLAGS += \
 	-DSTM32G474xx \
 	-DHSE_VALUE=24000000
 
-LD_FILE = $(BOARD_PATH)/STM32G474RETx_FLASH.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32g474xx.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32G474RETx_FLASH.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32g474xx.s
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32g474xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32g474xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32g474re
diff --git a/hw/bsp/stm32g4/family.c b/hw/bsp/stm32g4/family.c
index a2312b0d8..32c46b7d8 100644
--- a/hw/bsp/stm32g4/family.c
+++ b/hw/bsp/stm32g4/family.c
@@ -137,7 +137,8 @@ void board_init(void)
 
 void board_led_write(bool state)
 {
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
+  GPIO_PinState pin_state = (GPIO_PinState) (state ? LED_STATE_ON : (1-LED_STATE_ON));
+  HAL_GPIO_WritePin(LED_PORT, LED_PIN, pin_state);
 }
 
 uint32_t board_button_read(void)
@@ -177,7 +178,7 @@ uint32_t board_millis(void)
 
 void HardFault_Handler (void)
 {
-  asm("bkpt");
+  __asm("BKPT #0\n");
 }
 
 // Required by __libc_init_array in startup code if we are compiling using
diff --git a/hw/bsp/stm32g4/family.mk b/hw/bsp/stm32g4/family.mk
index 04222f3bb..79defac56 100644
--- a/hw/bsp/stm32g4/family.mk
+++ b/hw/bsp/stm32g4/family.mk
@@ -7,7 +7,14 @@ ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
 
 include $(TOP)/$(BOARD_PATH)/board.mk
 
+# --------------
+# Compiler Flags
+# --------------
 CFLAGS += \
+  -DCFG_TUSB_MCU=OPT_MCU_STM32G4
+  
+# GCC Flags
+GCC_CFLAGS += \
   -flto \
   -mthumb \
   -mabi=aapcs \
@@ -15,10 +22,17 @@ CFLAGS += \
   -mfloat-abi=hard \
   -mfpu=fpv4-sp-d16 \
   -nostdlib -nostartfiles \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32G4
 
 # suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=cast-align
+GCC_CFLAGS += -Wno-error=cast-align
+
+# IAR Flags
+IAR_CFLAGS += --cpu cortex-m4 --fpu VFPv4
+IAR_ASFLAGS += --cpu cortex-m4 --fpu VFPv4
+
+# -----------------
+# Sources & Include
+# -----------------
 
 SRC_C += \
 	src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c \
diff --git a/hw/bsp/stm32h7/boards/daisyseed/board.mk b/hw/bsp/stm32h7/boards/daisyseed/board.mk
index 68c62968e..4d718f04e 100644
--- a/hw/bsp/stm32h7/boards/daisyseed/board.mk
+++ b/hw/bsp/stm32h7/boards/daisyseed/board.mk
@@ -3,8 +3,13 @@ CFLAGS += -DSTM32H750xx -DCORE_CM7 -DHSE_VALUE=16000000
 # Default is FulSpeed port
 PORT ?= 0
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h750xx.s
-LD_FILE = $(BOARD_PATH)/stm32h750ibkx_flash.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h750xx.s
+GCC_LD_FILE = $(BOARD_PATH)/stm32h750ibkx_flash.ld
+
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h750xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h750xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32h750ibk6_m7
diff --git a/hw/bsp/stm32h7/boards/stm32h723nucleo/board.mk b/hw/bsp/stm32h7/boards/stm32h723nucleo/board.mk
index bbd0a0e58..57dfb7e64 100644
--- a/hw/bsp/stm32h7/boards/stm32h723nucleo/board.mk
+++ b/hw/bsp/stm32h7/boards/stm32h723nucleo/board.mk
@@ -3,8 +3,13 @@ CFLAGS += -DSTM32H723xx -DHSE_VALUE=8000000
 # Default is FulSpeed port
 PORT ?= 0
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h723xx.s
-LD_FILE = $(BOARD_PATH)/stm32h723xx_flash.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h723xx.s
+GCC_LD_FILE = $(BOARD_PATH)/stm32h723xx_flash.ld
+
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h723xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h723xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32h723zg
diff --git a/hw/bsp/stm32h7/boards/stm32h743eval/board.mk b/hw/bsp/stm32h7/boards/stm32h743eval/board.mk
index b768a0ee6..78ff47c09 100644
--- a/hw/bsp/stm32h7/boards/stm32h743eval/board.mk
+++ b/hw/bsp/stm32h7/boards/stm32h743eval/board.mk
@@ -4,8 +4,13 @@ CFLAGS += -DSTM32H743xx -DHSE_VALUE=25000000
 PORT ?= 1
 SPEED ?= high
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h743xx.s
-LD_FILE = $(BOARD_PATH)/stm32h743xx_flash.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h743xx.s
+GCC_LD_FILE = $(BOARD_PATH)/stm32h743xx_flash.ld
+
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h743xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h743xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32h743xi
diff --git a/hw/bsp/stm32h7/boards/stm32h743nucleo/board.mk b/hw/bsp/stm32h7/boards/stm32h743nucleo/board.mk
index fc670fe76..4bdd5b6a8 100644
--- a/hw/bsp/stm32h7/boards/stm32h743nucleo/board.mk
+++ b/hw/bsp/stm32h7/boards/stm32h743nucleo/board.mk
@@ -3,8 +3,13 @@ CFLAGS += -DSTM32H743xx -DHSE_VALUE=8000000
 # Default is FulSpeed port
 PORT ?= 0
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h743xx.s
-LD_FILE = $(BOARD_PATH)/stm32h743xx_flash.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h743xx.s
+GCC_LD_FILE = $(BOARD_PATH)/stm32h743xx_flash.ld
+
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h743xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h743xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32h743zi
diff --git a/hw/bsp/stm32h7/boards/stm32h745disco/board.mk b/hw/bsp/stm32h7/boards/stm32h745disco/board.mk
index 384065bde..b51b109f6 100644
--- a/hw/bsp/stm32h7/boards/stm32h745disco/board.mk
+++ b/hw/bsp/stm32h7/boards/stm32h745disco/board.mk
@@ -6,8 +6,13 @@ CFLAGS += -DSTM32H745xx -DCORE_CM7 -DHSE_VALUE=25000000
 # Default is FulSpeed port
 PORT ?= 0
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h745xx.s
-LD_FILE = $(ST_CMSIS)/Source/Templates/gcc/linker/stm32h745xx_flash_CM7.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h745xx.s
+GCC_LD_FILE = $(ST_CMSIS)/Source/Templates/gcc/linker/stm32h745xx_flash_CM7.ld
+
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h745xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h745xx_flash_CM7.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32h745xi_m7
diff --git a/hw/bsp/stm32h7/boards/waveshare_openh743i/board.h b/hw/bsp/stm32h7/boards/waveshare_openh743i/board.h
index 2b072e07c..cf6ad762e 100644
--- a/hw/bsp/stm32h7/boards/waveshare_openh743i/board.h
+++ b/hw/bsp/stm32h7/boards/waveshare_openh743i/board.h
@@ -212,9 +212,9 @@ static inline void board_stm32h7_post_init(void)
 
   // Reset PHY, change the delays as you see fit
   timer_board_delay(&tim2Handle, 5U);
-  HAL_GPIO_WritePin(ULPI_RST_PORT, ULPI_RST_PIN, 1U);
+  HAL_GPIO_WritePin(ULPI_RST_PORT, ULPI_RST_PIN, GPIO_PIN_SET);
   timer_board_delay(&tim2Handle, 20U);
-  HAL_GPIO_WritePin(ULPI_RST_PORT, ULPI_RST_PIN, 0U);
+  HAL_GPIO_WritePin(ULPI_RST_PORT, ULPI_RST_PIN, GPIO_PIN_RESET);
   timer_board_delay(&tim2Handle, 20U);
 
   //Disable the timer used for delays
diff --git a/hw/bsp/stm32h7/boards/waveshare_openh743i/board.mk b/hw/bsp/stm32h7/boards/waveshare_openh743i/board.mk
index 4dfcc1cac..fbf4b55c6 100644
--- a/hw/bsp/stm32h7/boards/waveshare_openh743i/board.mk
+++ b/hw/bsp/stm32h7/boards/waveshare_openh743i/board.mk
@@ -3,15 +3,20 @@ CFLAGS += -DSTM32H743xx -DHSE_VALUE=8000000
 # Default is HS port
 PORT ?= 1
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h743xx.s
-LD_FILE = $(BOARD_PATH)/STM32H743IITX_FLASH.ld
-
 # Use Timer module for ULPI PHY reset
 CFLAGS += -DHAL_TIM_MODULE_ENABLED
 SRC_C += \
   $(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_tim.c \
   $(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_tim_ex.c
 
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h743xx.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32H743IITX_FLASH.ld
+
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32h743xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32h743xx_flash.icf
+
 # For flash-jlink target
 JLINK_DEVICE = stm32h743ii
 
diff --git a/hw/bsp/stm32h7/family.c b/hw/bsp/stm32h7/family.c
index 0aa8fe47f..28a2568fa 100644
--- a/hw/bsp/stm32h7/family.c
+++ b/hw/bsp/stm32h7/family.c
@@ -225,7 +225,8 @@ void board_init(void)
 
 void board_led_write(bool state)
 {
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
+  GPIO_PinState pin_state = (GPIO_PinState) (state ? LED_STATE_ON : (1-LED_STATE_ON));
+  HAL_GPIO_WritePin(LED_PORT, LED_PIN, pin_state);
 }
 
 uint32_t board_button_read(void)
@@ -261,7 +262,7 @@ uint32_t board_millis(void)
 
 void HardFault_Handler(void)
 {
-  asm("bkpt");
+  __asm("BKPT #0\n");
 }
 
 // Required by __libc_init_array in startup code if we are compiling using
diff --git a/hw/bsp/stm32h7/family.mk b/hw/bsp/stm32h7/family.mk
index a1cd93b27..834347b4b 100644
--- a/hw/bsp/stm32h7/family.mk
+++ b/hw/bsp/stm32h7/family.mk
@@ -7,14 +7,10 @@ ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
 
 include $(TOP)/$(BOARD_PATH)/board.mk
 
+# --------------
+# Compiler Flags
+# --------------
 CFLAGS += \
-  -flto \
-  -mthumb \
-  -mabi=aapcs \
-  -mcpu=cortex-m7 \
-  -mfloat-abi=hard \
-  -mfpu=fpv5-d16 \
-  -nostdlib -nostartfiles \
   -DCFG_TUSB_MCU=OPT_MCU_STM32H7 \
 	-DBOARD_TUD_RHPORT=$(PORT)
 
@@ -30,10 +26,26 @@ else
   $(info "Using OTG_FS")
 endif
 
-# suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=maybe-uninitialized -Wno-error=cast-align
+# GCC Flags
+GCC_CFLAGS += \
+  -flto \
+  -mthumb \
+  -mabi=aapcs \
+  -mcpu=cortex-m7 \
+  -mfloat-abi=hard \
+  -mfpu=fpv5-d16 \
+  -nostdlib -nostartfiles
 
-# All source paths should be relative to the top level.
+# suppress warning caused by vendor mcu driver
+GCC_CFLAGS += -Wno-error=maybe-uninitialized -Wno-error=cast-align
+
+# IAR Flags
+IAR_CFLAGS += --cpu cortex-m7 --fpu VFPv5_D16
+IAR_ASFLAGS += --cpu cortex-m7 --fpu VFPv5_D16
+
+# -----------------
+# Sources & Include
+# -----------------
 
 SRC_C += \
 	src/portable/synopsys/dwc2/dcd_dwc2.c \
diff --git a/hw/bsp/stm32l4/boards/stm32l412nucleo/board.mk b/hw/bsp/stm32l4/boards/stm32l412nucleo/board.mk
index 841ee4948..854397fc8 100644
--- a/hw/bsp/stm32l4/boards/stm32l412nucleo/board.mk
+++ b/hw/bsp/stm32l4/boards/stm32l412nucleo/board.mk
@@ -1,10 +1,13 @@
 CFLAGS += \
   -DSTM32L412xx \
 
-# All source paths should be relative to the top level.
-LD_FILE = $(BOARD_PATH)/STM32L412KBUx_FLASH.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32l412xx.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32L412KBUx_FLASH.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32l412xx.s
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32l412xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32l412xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32l412kb
diff --git a/hw/bsp/stm32l4/boards/stm32l476disco/board.mk b/hw/bsp/stm32l4/boards/stm32l476disco/board.mk
index e7b8557a5..125f1f106 100644
--- a/hw/bsp/stm32l4/boards/stm32l476disco/board.mk
+++ b/hw/bsp/stm32l4/boards/stm32l476disco/board.mk
@@ -1,10 +1,13 @@
 CFLAGS += \
   -DSTM32L476xx \
 
-# All source paths should be relative to the top level.
-LD_FILE = $(BOARD_PATH)/STM32L476VGTx_FLASH.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32l476xx.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32L476VGTx_FLASH.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32l476xx.s
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32l476xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32l476xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32l476vg
diff --git a/hw/bsp/stm32l4/boards/stm32l4p5nucleo/board.mk b/hw/bsp/stm32l4/boards/stm32l4p5nucleo/board.mk
index 8252dd838..11edcd9a8 100644
--- a/hw/bsp/stm32l4/boards/stm32l4p5nucleo/board.mk
+++ b/hw/bsp/stm32l4/boards/stm32l4p5nucleo/board.mk
@@ -1,10 +1,13 @@
 CFLAGS += \
   -DSTM32L4P5xx \
 
-# All source paths should be relative to the top level.
-LD_FILE = $(BOARD_PATH)/STM32L4P5ZGTX_FLASH.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32l4p5xx.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32L4P5ZGTX_FLASH.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32l4p5xx.s
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32l4p5xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32l4p5xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32l4p5zg
diff --git a/hw/bsp/stm32l4/boards/stm32l4r5nucleo/board.mk b/hw/bsp/stm32l4/boards/stm32l4r5nucleo/board.mk
index 3d7fa227b..6dca88a8b 100644
--- a/hw/bsp/stm32l4/boards/stm32l4r5nucleo/board.mk
+++ b/hw/bsp/stm32l4/boards/stm32l4r5nucleo/board.mk
@@ -2,10 +2,13 @@ CFLAGS += \
   -DHSE_VALUE=8000000 \
   -DSTM32L4R5xx \
 
-# All source paths should be relative to the top level.
-LD_FILE = $(BOARD_PATH)/STM32L4RXxI_FLASH.ld
+# GCC
+GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32l4r5xx.s
+GCC_LD_FILE = $(BOARD_PATH)/STM32L4RXxI_FLASH.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32l4r5xx.s
+# IAR
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32l4r5xx.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32l4r5xx_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32l4r5zi
diff --git a/hw/bsp/stm32l4/family.c b/hw/bsp/stm32l4/family.c
index 0b1443aa0..19b84c086 100644
--- a/hw/bsp/stm32l4/family.c
+++ b/hw/bsp/stm32l4/family.c
@@ -179,7 +179,8 @@ void board_init(void)
 
 void board_led_write(bool state)
 {
-  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
+  GPIO_PinState pin_state = (GPIO_PinState) (state ? LED_STATE_ON : (1-LED_STATE_ON));
+  HAL_GPIO_WritePin(LED_PORT, LED_PIN, pin_state);
 }
 
 uint32_t board_button_read(void)
@@ -214,7 +215,7 @@ uint32_t board_millis(void)
 
 void HardFault_Handler (void)
 {
-  asm("bkpt 0x10");
+  __asm("BKPT #0\n");
 }
 
 // Required by __libc_init_array in startup code if we are compiling using
diff --git a/hw/bsp/stm32l4/family.mk b/hw/bsp/stm32l4/family.mk
index 1361e184c..4fab7dc0d 100644
--- a/hw/bsp/stm32l4/family.mk
+++ b/hw/bsp/stm32l4/family.mk
@@ -6,23 +6,36 @@ ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
 
 include $(TOP)/$(BOARD_PATH)/board.mk
 
+# --------------
+# Compiler Flags
+# --------------
 CFLAGS += \
+  -DCFG_TUSB_MCU=OPT_MCU_STM32L4
+
+# GCC Flags
+GCC_CFLAGS += \
   -flto \
   -mthumb \
   -mabi=aapcs \
   -mcpu=cortex-m4 \
   -mfloat-abi=hard \
   -mfpu=fpv4-sp-d16 \
-  -nostdlib -nostartfiles \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32L4
+  -nostdlib -nostartfiles
 
 # suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=maybe-uninitialized -Wno-error=cast-align
+GCC_CFLAGS += -Wno-error=maybe-uninitialized -Wno-error=cast-align
+
+# IAR Flags
+IAR_CFLAGS += --cpu cortex-m4 --fpu VFPv4
+IAR_ASFLAGS += --cpu cortex-m4 --fpu VFPv4
+
+# -----------------
+# Sources & Include
+# -----------------
 
-#src/portable/st/synopsys/dcd_synopsys.c
 SRC_C += \
 	src/portable/synopsys/dwc2/dcd_dwc2.c \
-    src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c \
+	src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c \
 	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \
 	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal.c \
 	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_cortex.c \
diff --git a/src/class/video/video_device.c b/src/class/video/video_device.c
index e17d0a90f..257285126 100644
--- a/src/class/video/video_device.c
+++ b/src/class/video/video_device.c
@@ -108,7 +108,7 @@ typedef struct TU_ATTR_PACKED {
 
 /* video control interface */
 typedef struct TU_ATTR_PACKED {
-  void const *beg;  /* The head of the first video control interface descriptor */
+  uint8_t const *beg;  /* The head of the first video control interface descriptor */
   uint16_t    len;  /* Byte length of the descriptors */
   uint16_t    cur;  /* offset for current video control interface */
   uint8_t     stm[CFG_TUD_VIDEO_STREAMING]; /* Indices of streaming interface */
@@ -174,7 +174,7 @@ static tusb_desc_vc_itf_t const* _get_desc_vc(videod_interface_t const *self)
 static tusb_desc_vs_itf_t const* _get_desc_vs(videod_streaming_interface_t const *self)
 {
   if (!self->desc.cur) return NULL;
-  void const *desc = _videod_itf[self->index_vc].beg;
+  uint8_t const *desc = _videod_itf[self->index_vc].beg;
   return (tusb_desc_vs_itf_t const*)(desc + self->desc.cur);
 }
 
@@ -247,9 +247,9 @@ static void const* _next_desc_itf(void const *beg, void const *end)
  *
  * @return The pointer for interface descriptor.
  * @retval end   did not found interface descriptor */
-static inline void const* _find_desc_itf(void const *beg, void const *end, uint_fast8_t itfnum, uint_fast8_t altnum)
+static inline uint8_t const* _find_desc_itf(void const *beg, void const *end, uint_fast8_t itfnum, uint_fast8_t altnum)
 {
-  return _find_desc_3(beg, end, TUSB_DESC_INTERFACE, itfnum, altnum);
+  return (uint8_t const*) _find_desc_3(beg, end, TUSB_DESC_INTERFACE, itfnum, altnum);
 }
 
 /** Find the first endpoint descriptor belonging to the current interface descriptor.
@@ -275,7 +275,7 @@ static void const* _find_desc_ep(void const *beg, void const *end)
 static inline void const* _end_of_control_descriptor(void const *desc)
 {
   tusb_desc_vc_itf_t const *vc = (tusb_desc_vc_itf_t const *)desc;
-  return desc + vc->std.bLength + vc->ctl.wTotalLength;
+  return ((uint8_t const*) desc) + vc->std.bLength + tu_le16toh(vc->ctl.wTotalLength);
 }
 
 /** Find the first entity descriptor with the entity ID
@@ -305,7 +305,7 @@ static void const* _find_desc_entity(void const *desc, uint_fast8_t entityid)
 static inline void const* _end_of_streaming_descriptor(void const *desc)
 {
   tusb_desc_vs_itf_t const *vs = (tusb_desc_vs_itf_t const *)desc;
-  return desc + vs->std.bLength + vs->stm.wTotalLength;
+  return ((uint8_t const*) desc) + vs->std.bLength + tu_le16toh(vs->stm.wTotalLength);
 }
 
 /** Find the first format descriptor with the specified format number. */
@@ -581,8 +581,10 @@ static bool _negotiate_streaming_parameters(videod_streaming_interface_t const *
 static bool _close_vc_itf(uint8_t rhport, videod_interface_t *self)
 {
   tusb_desc_vc_itf_t const *vc = _get_desc_vc(self);
+
   /* The next descriptor after the class-specific VC interface header descriptor. */
-  void const *cur = (void const*)vc + vc->std.bLength + vc->ctl.bLength;
+  void const *cur = (uint8_t const*)vc + vc->std.bLength + vc->ctl.bLength;
+
   /* The end of the video control interface descriptor. */
   void const *end = _end_of_control_descriptor(vc);
   if (vc->std.bNumEndpoints) {
@@ -603,10 +605,11 @@ static bool _close_vc_itf(uint8_t rhport, videod_interface_t *self)
 static bool _open_vc_itf(uint8_t rhport, videod_interface_t *self, uint_fast8_t altnum)
 {
   TU_LOG2("    open VC %d\n", altnum);
-  void const *beg = self->beg;
-  void const *end = beg + self->len;
+  uint8_t const *beg = self->beg;
+  uint8_t const *end = beg + self->len;
+
   /* The first descriptor is a video control interface descriptor. */
-  void const *cur = _find_desc_itf(beg, end, _desc_itfnum(beg), altnum);
+  uint8_t const *cur = _find_desc_itf(beg, end, _desc_itfnum(beg), altnum);
   TU_LOG2("    cur %d\n", cur - beg);
   TU_VERIFY(cur < end);
 
@@ -616,7 +619,8 @@ static bool _open_vc_itf(uint8_t rhport, videod_interface_t *self, uint_fast8_t
   TU_ASSERT(vc->ctl.bInCollection <= CFG_TUD_VIDEO_STREAMING);
 
   /* Update to point the end of the video control interface descriptor. */
-  end  = _end_of_control_descriptor(cur);
+  end = _end_of_control_descriptor(cur);
+
   /* Advance to the next descriptor after the class-specific VC interface header descriptor. */
   cur += vc->std.bLength + vc->ctl.bLength;
   TU_LOG2("    bNumEndpoints %d\n", vc->std.bNumEndpoints);
@@ -631,7 +635,7 @@ static bool _open_vc_itf(uint8_t rhport, videod_interface_t *self, uint_fast8_t
     /* Open the notification endpoint */
     TU_ASSERT(usbd_edpt_open(rhport, notif));
   }
-  self->cur = (uint16_t) ((void const*)vc - beg);
+  self->cur = (uint16_t) ((uint8_t const*)vc - beg);
   return true;
 }
 
@@ -643,7 +647,7 @@ static bool _open_vs_itf(uint8_t rhport, videod_streaming_interface_t *stm, uint
 {
   uint_fast8_t i;
   TU_LOG2("    reopen VS %d\n", altnum);
-  void const *desc = _videod_itf[stm->index_vc].beg;
+  uint8_t const *desc = _videod_itf[stm->index_vc].beg;
 
   /* Close endpoints of previous settings. */
   for (i = 0; i < TU_ARRAY_SIZE(stm->desc.ep); ++i) {
@@ -654,16 +658,18 @@ static bool _open_vs_itf(uint8_t rhport, videod_streaming_interface_t *stm, uint
     stm->desc.ep[i] = 0;
     TU_LOG2("    close EP%02x\n", ep_adr);
   }
+
   /* clear transfer management information */
   stm->buffer  = NULL;
   stm->bufsize = 0;
   stm->offset  = 0;
 
   /* Find a alternate interface */
-  void const *beg = desc + stm->desc.beg;
-  void const *end = desc + stm->desc.end;
-  void const *cur = _find_desc_itf(beg, end, _desc_itfnum(beg), altnum);
+  uint8_t const *beg = desc + stm->desc.beg;
+  uint8_t const *end = desc + stm->desc.end;
+  uint8_t const *cur = _find_desc_itf(beg, end, _desc_itfnum(beg), altnum);
   TU_VERIFY(cur < end);
+
   uint_fast8_t numeps = ((tusb_desc_interface_t const *)cur)->bNumEndpoints;
   TU_ASSERT(numeps <= TU_ARRAY_SIZE(stm->desc.ep));
   stm->desc.cur = (uint16_t) (cur - desc); /* Save the offset of the new settings */
@@ -1043,7 +1049,6 @@ static int handle_video_stm_req(uint8_t rhport, uint8_t stage,
 
     default: return VIDEO_ERROR_INVALID_REQUEST;
   }
-  return VIDEO_ERROR_UNKNOWN;
 }
 
 //--------------------------------------------------------------------+
@@ -1076,7 +1081,7 @@ bool tud_video_n_frame_xfer(uint_fast8_t ctl_idx, uint_fast8_t stm_idx, void *bu
   if (!stm || !stm->desc.ep[0] || stm->buffer) return false;
 
   /* Find EP address */
-  void const *desc = _videod_itf[stm->index_vc].beg;
+  uint8_t const *desc = _videod_itf[stm->index_vc].beg;
   uint8_t ep_addr = 0;
   for (uint_fast8_t i = 0; i < CFG_TUD_VIDEO_STREAMING; ++i) {
     uint_fast16_t ofs_ep = stm->desc.ep[i];
@@ -1143,13 +1148,15 @@ uint16_t videod_open(uint8_t rhport, tusb_desc_interface_t const * itf_desc, uin
   }
   TU_ASSERT(ctl_idx < CFG_TUD_VIDEO, 0);
 
-  void const *end = (void const*)itf_desc + max_len;
-  self->beg = itf_desc;
+  uint8_t const *end = (uint8_t const*)itf_desc + max_len;
+  self->beg = (uint8_t const*) itf_desc;
   self->len = max_len;
+
   /*------------- Video Control Interface -------------*/
   TU_VERIFY(_open_vc_itf(rhport, self, 0), 0);
   tusb_desc_vc_itf_t const *vc = _get_desc_vc(self);
   uint_fast8_t bInCollection   = vc->ctl.bInCollection;
+
   /* Find the end of the video interface descriptor */
   void const *cur = _next_desc_itf(itf_desc, end);
   for (uint8_t stm_idx = 0; stm_idx < bInCollection; ++stm_idx) {
@@ -1200,7 +1207,7 @@ bool videod_control_xfer_cb(uint8_t rhport, uint8_t stage, tusb_control_request_
   for (itf = 0; itf < CFG_TUD_VIDEO_STREAMING; ++itf) {
     videod_streaming_interface_t *stm = &_videod_streaming_itf[itf];
     if (!stm->desc.beg) continue;
-    void const *desc = _videod_itf[stm->index_vc].beg;
+    uint8_t const *desc = _videod_itf[stm->index_vc].beg;
     if (itfnum == _desc_itfnum(desc + stm->desc.beg)) break;
   }
 
@@ -1226,7 +1233,7 @@ bool videod_xfer_cb(uint8_t rhport, uint8_t ep_addr, xfer_result_t result, uint3
     uint_fast16_t const ep_ofs = stm->desc.ep[0];
     if (!ep_ofs) continue;
     ctl = &_videod_itf[stm->index_vc];
-    void const *desc = ctl->beg;
+    uint8_t const *desc = ctl->beg;
     if (ep_addr == _desc_ep_addr(desc + ep_ofs)) break;
   }
 
diff --git a/src/common/tusb_compiler.h b/src/common/tusb_compiler.h
index 2c30daf6f..a0a49d7ec 100644
--- a/src/common/tusb_compiler.h
+++ b/src/common/tusb_compiler.h
@@ -76,9 +76,9 @@
  * - ##__VA_ARGS__ is used to deal with 0 paramerter (swallows comma)
  *------------------------------------------------------------------*/
 #if !defined(__CCRX__)
-#define TU_ARGS_NUM(...)   _TU_NARG(_0, ##__VA_ARGS__,_RSEQ_N())
+#define TU_ARGS_NUM(...)   _TU_NARG(_0, ##__VA_ARGS__, _RSEQ_N())
 #else
-#define TU_ARGS_NUM(...)   _TU_NARG(_0, __VA_ARGS__,_RSEQ_N())
+#define TU_ARGS_NUM(...)   _TU_NARG(_0, __VA_ARGS__, _RSEQ_N())
 #endif
 
 #define _TU_NARG(...)      _GET_NTH_ARG(__VA_ARGS__)
diff --git a/src/common/tusb_types.h b/src/common/tusb_types.h
index 32cdba450..82798a484 100644
--- a/src/common/tusb_types.h
+++ b/src/common/tusb_types.h
@@ -543,22 +543,35 @@ TU_ATTR_ALWAYS_INLINE static inline const char *tu_edpt_type_str(tusb_xfer_type_
 //--------------------------------------------------------------------+
 // Descriptor helper
 //--------------------------------------------------------------------+
+
+// return next descriptor
 TU_ATTR_ALWAYS_INLINE static inline uint8_t const * tu_desc_next(void const* desc)
 {
   uint8_t const* desc8 = (uint8_t const*) desc;
   return desc8 + desc8[DESC_OFFSET_LEN];
 }
 
+// get descriptor type
 TU_ATTR_ALWAYS_INLINE static inline uint8_t tu_desc_type(void const* desc)
 {
   return ((uint8_t const*) desc)[DESC_OFFSET_TYPE];
 }
 
+// get descriptor length
 TU_ATTR_ALWAYS_INLINE static inline uint8_t tu_desc_len(void const* desc)
 {
   return ((uint8_t const*) desc)[DESC_OFFSET_LEN];
 }
 
+// find descriptor that match byte1 (type)
+uint8_t const * tu_desc_find(uint8_t const* desc, uint8_t const* end, uint8_t byte1);
+
+// find descriptor that match byte1 (type) and byte2
+uint8_t const * tu_desc_find2(uint8_t const* desc, uint8_t const* end, uint8_t byte1, uint8_t byte2);
+
+// find descriptor that match byte1 (type) and byte2
+uint8_t const * tu_desc_find3(uint8_t const* desc, uint8_t const* end, uint8_t byte1, uint8_t byte2, uint8_t byte3);
+
 #ifdef __cplusplus
  }
 #endif
diff --git a/src/tusb.c b/src/tusb.c
index a5c820b8d..44b34b0e6 100644
--- a/src/tusb.c
+++ b/src/tusb.c
@@ -73,6 +73,41 @@ bool tusb_inited(void)
   return ret;
 }
 
+//--------------------------------------------------------------------+
+// Descriptor helper
+//--------------------------------------------------------------------+
+
+uint8_t const * tu_desc_find(uint8_t const* desc, uint8_t const* end, uint8_t byte1)
+{
+  while(desc+1 < end)
+  {
+    if ( desc[1] == byte1 ) return desc;
+    desc += desc[DESC_OFFSET_LEN];
+  }
+  return NULL;
+}
+
+uint8_t const * tu_desc_find2(uint8_t const* desc, uint8_t const* end, uint8_t byte1, uint8_t byte2)
+{
+  while(desc+2 < end)
+  {
+    if ( desc[1] == byte1 && desc[2] == byte2) return desc;
+    desc += desc[DESC_OFFSET_LEN];
+  }
+  return NULL;
+}
+
+uint8_t const * tu_desc_find3(uint8_t const* desc, uint8_t const* end, uint8_t byte1, uint8_t byte2, uint8_t byte3)
+{
+  while(desc+3 < end)
+  {
+    if (desc[1] == byte1 && desc[2] == byte2 && desc[3] == byte3) return desc;
+    desc += desc[DESC_OFFSET_LEN];
+  }
+  return NULL;
+}
+
+
 //--------------------------------------------------------------------+
 // Endpoint Helper for both Host and Device stack
 //--------------------------------------------------------------------+
diff --git a/src/tusb_option.h b/src/tusb_option.h
index 67377b7ec..cf5b21c9c 100644
--- a/src/tusb_option.h
+++ b/src/tusb_option.h
@@ -27,9 +27,6 @@
 #ifndef _TUSB_OPTION_H_
 #define _TUSB_OPTION_H_
 
-// To avoid GCC compiler warnings when -pedantic option is used (strict ISO C)
-typedef int make_iso_compilers_happy;
-
 #include "common/tusb_compiler.h"
 
 #define TUSB_VERSION_MAJOR     0
@@ -435,6 +432,9 @@ typedef int make_iso_compilers_happy;
   #error Control Endpoint Max Packet Size cannot be larger than 64
 #endif
 
+// To avoid GCC compiler warnings when -pedantic option is used (strict ISO C)
+typedef int make_iso_compilers_happy;
+
 #endif /* _TUSB_OPTION_H_ */
 
 /** @} */
diff --git a/test/unit-test/test/test_common_func.c b/test/unit-test/test/test_common_func.c
new file mode 100644
index 000000000..981531dd7
--- /dev/null
+++ b/test/unit-test/test/test_common_func.c
@@ -0,0 +1,82 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2023, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#include <string.h>
+#include "unity.h"
+
+#include "tusb_common.h"
+
+//--------------------------------------------------------------------+
+// MACRO TYPEDEF CONSTANT ENUM DECLARATION
+//--------------------------------------------------------------------+
+
+
+//------------- IMPLEMENTATION -------------//
+
+void setUp(void)
+{
+}
+
+void tearDown(void)
+{
+}
+
+void test_TU_ARGS_NUM(void)
+{
+  TEST_ASSERT_EQUAL( 0, TU_ARGS_NUM());
+  TEST_ASSERT_EQUAL( 1, TU_ARGS_NUM(a1));
+  TEST_ASSERT_EQUAL( 2, TU_ARGS_NUM(a1, a2));
+  TEST_ASSERT_EQUAL( 3, TU_ARGS_NUM(a1, a2, a3));
+  TEST_ASSERT_EQUAL( 4, TU_ARGS_NUM(a1, a2, a3, a4));
+  TEST_ASSERT_EQUAL( 5, TU_ARGS_NUM(a1, a2, a3, a4, a5));
+  TEST_ASSERT_EQUAL( 6, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6));
+  TEST_ASSERT_EQUAL( 7, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7));
+  TEST_ASSERT_EQUAL( 8, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8));
+  TEST_ASSERT_EQUAL( 9, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9));
+  TEST_ASSERT_EQUAL(10, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10));
+  TEST_ASSERT_EQUAL(11, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11));
+  TEST_ASSERT_EQUAL(12, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12));
+  TEST_ASSERT_EQUAL(13, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13));
+  TEST_ASSERT_EQUAL(14, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14));
+  TEST_ASSERT_EQUAL(15, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15));
+  TEST_ASSERT_EQUAL(16, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16));
+  TEST_ASSERT_EQUAL(17, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17));
+  TEST_ASSERT_EQUAL(18, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18));
+  TEST_ASSERT_EQUAL(19, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19));
+  TEST_ASSERT_EQUAL(20, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20));
+  TEST_ASSERT_EQUAL(21, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21));
+  TEST_ASSERT_EQUAL(22, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22));
+  TEST_ASSERT_EQUAL(23, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23));
+  TEST_ASSERT_EQUAL(24, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24));
+  TEST_ASSERT_EQUAL(25, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25));
+  TEST_ASSERT_EQUAL(26, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26));
+  TEST_ASSERT_EQUAL(27, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27));
+  TEST_ASSERT_EQUAL(28, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28));
+  TEST_ASSERT_EQUAL(29, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28, a29));
+  TEST_ASSERT_EQUAL(30, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28, a29, a30));
+  TEST_ASSERT_EQUAL(31, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28, a29, a30, a31));
+  TEST_ASSERT_EQUAL(32, TU_ARGS_NUM(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28, a29, a30, a31, a32));
+}
diff --git a/tools/build_board.py b/tools/build_board.py
index 8d10ef820..4593dafa5 100644
--- a/tools/build_board.py
+++ b/tools/build_board.py
@@ -52,7 +52,7 @@ if __name__ == '__main__':
     for example in all_examples:
         print(build_separator)
         with Pool(processes=os.cpu_count()) as pool:
-            pool_args = list((map(lambda b, e=example: [e, b], all_boards)))
+            pool_args = list((map(lambda b, e=example, o='': [e, b, o], all_boards)))
             result = pool.starmap(build_utils.build_example, pool_args)
             # sum all element of same index (column sum)
             result = list(map(sum, list(zip(*result))))
diff --git a/tools/build_family.py b/tools/build_family.py
index c6c64d2b3..cdc099691 100644
--- a/tools/build_family.py
+++ b/tools/build_family.py
@@ -11,6 +11,7 @@ SKIPPED = "\033[33mskipped\033[0m"
 
 build_separator = '-' * 106
 
+make_iar_option = 'CC=iccarm'
 
 def filter_with_input(mylist):
     if len(sys.argv) > 1:
@@ -19,7 +20,7 @@ def filter_with_input(mylist):
             mylist[:] = input_args
 
 
-def build_family(example, family):
+def build_family(example, family, make_option):
     all_boards = []
     for entry in os.scandir("hw/bsp/{}/boards".format(family)):
         if entry.is_dir() and entry.name != 'pico_sdk':
@@ -28,13 +29,17 @@ def build_family(example, family):
     all_boards.sort()
 
     with Pool(processes=os.cpu_count()) as pool:
-        pool_args = list((map(lambda b, e=example: [e, b], all_boards)))
+        pool_args = list((map(lambda b, e=example, o=make_option: [e, b, o], all_boards)))
         result = pool.starmap(build_utils.build_example, pool_args)
         # sum all element of same index (column sum)
         return list(map(sum, list(zip(*result))))
 
 
 if __name__ == '__main__':
+    # IAR CC
+    if make_iar_option not in sys.argv:
+        make_iar_option = ''
+
     # If examples are not specified in arguments, build all
     all_examples = []
     for dir1 in os.scandir("examples"):
@@ -62,7 +67,7 @@ if __name__ == '__main__':
     for example in all_examples:
         print(build_separator)
         for family in all_families:
-            fret = build_family(example, family)
+            fret = build_family(example, family, make_iar_option)
             total_result = list(map(lambda x, y: x + y, total_result, fret))
 
     total_time = time.monotonic() - total_time
diff --git a/tools/build_utils.py b/tools/build_utils.py
index f457c7986..ad1daf8c7 100644
--- a/tools/build_utils.py
+++ b/tools/build_utils.py
@@ -77,7 +77,7 @@ def skip_example(example, board):
     return False
 
 
-def build_example(example, board):
+def build_example(example, board, make_option):
     start_time = time.monotonic()
     flash_size = "-"
     sram_size = "-"
@@ -91,14 +91,14 @@ def build_example(example, board):
         ret[2] = 1
         print(build_format.format(example, board, status, '-', flash_size, sram_size))
     else:
-        build_result = subprocess.run("make -j -C examples/{} BOARD={} all".format(example, board), shell=True,
+        build_result = subprocess.run("make -j -C examples/{} BOARD={} {} all".format(example, board, make_option), shell=True,
                                       stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
 
         if build_result.returncode == 0:
             status = SUCCEEDED
             ret[0] = 1
             (flash_size, sram_size) = build_size(example, board)
-            subprocess.run("make -j -C examples/{} BOARD={} copy-artifact".format(example, board), shell=True,
+            subprocess.run("make -j -C examples/{} BOARD={} {} copy-artifact".format(example, board, make_option), shell=True,
                            stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
         else:
             status = FAILED