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..2c4df85ba 100644
--- a/examples/rules.mk
+++ b/examples/rules.mk
@@ -46,31 +46,34 @@ INC += $(TOP)/src
 
 CFLAGS += $(addprefix -I,$(INC))
 
+ifdef USE_IAR
+
+IAR_CFLAGS += $(CFLAGS) -e --debug
+IAR_LDFLAGS += --config $(TOP)/$(IAR_LD_FILE)
+
+else
+
+CFLAGS += $(GCC_CFLAGS)
+
 # LTO makes it difficult to analyze map file for optimizing size purpose
 # We will run this option in ci
 ifeq ($(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
 
-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)
 
-# Assembly files can be name with upper case .S, convert it to .s
-SRC_S := $(SRC_S:.S=.s)
-
-# Due to GCC LTO bug https://bugs.launchpad.net/gcc-arm-embedded/+bug/1747966
-# assembly file should be placed first in linking order
-# '_asm' suffix is added to object of assembly file
-OBJ += $(addprefix $(BUILD)/obj/, $(SRC_S:.s=_asm.o))
-OBJ += $(addprefix $(BUILD)/obj/, $(SRC_C:.c=.o))
+endif
 
 # Verbose mode
 ifeq ("$(V)","1")
@@ -79,6 +82,21 @@ $(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)
+IAR_SRC_S := $(IAR_SRC_S:.S=.s)
+
+# Due to GCC LTO bug https://bugs.launchpad.net/gcc-arm-embedded/+bug/1747966
+# assembly file should be placed first in linking order
+# '_asm' suffix is added to object of assembly file
+ifdef USE_IAR
+OBJ += $(addprefix $(BUILD)/obj/, $(IAR_SRC_S:.s=_asm.o))
+else
+OBJ += $(addprefix $(BUILD)/obj/, $(SRC_S:.s=_asm.o))
+endif
+
+OBJ += $(addprefix $(BUILD)/obj/, $(SRC_C:.c=.o))
+
 # ---------------------------------------
 # Rules
 # ---------------------------------------
@@ -96,9 +114,15 @@ else
 	@$(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)
+
+ifndef USE_IAR
+# GCC based compiler
 
 $(BUILD)/$(PROJECT).bin: $(BUILD)/$(PROJECT).elf
 	@echo CREATE $@
@@ -108,6 +132,56 @@ $(BUILD)/$(PROJECT).hex: $(BUILD)/$(PROJECT).elf
 	@echo CREATE $@
 	@$(OBJCOPY) -O ihex $^ $@
 
+$(BUILD)/$(PROJECT).elf: $(OBJ)
+	@echo LINK $@
+	@$(LD) -o $@ $(LDFLAGS) $^ -Wl,--start-group $(LIBS) -Wl,--end-group
+
+$(BUILD)/obj/%.o: %.c
+	@echo CC $(notdir $@)
+	@$(CC) $(CFLAGS) -c -MD -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 $@ $<
+
+else
+
+# IAR Compiler
+
+$(BUILD)/$(PROJECT).bin: $(BUILD)/$(PROJECT).elf
+	@echo CREATE $@
+	@$(OBJCOPY) --bin $^ $@
+
+$(BUILD)/$(PROJECT).hex: $(BUILD)/$(PROJECT).elf
+	@echo CREATE $@
+	@$(OBJCOPY) --ihex $^ $@
+
+$(BUILD)/$(PROJECT).elf: $(OBJ)
+	@echo LINK $@
+	@$(LD) $(IAR_LDFLAGS) $^ -o $@
+
+$(BUILD)/obj/%.o: %.c
+	@echo CC $(notdir $@)
+	@$(CC) $(IAR_CFLAGS) -c -o $@ $<
+
+# ASM sources lower case .s
+$(BUILD)/obj/%_asm.o: %.s
+	@echo AS $(notdir $@)
+	@$(AS) $(IAR_ASFLAGS) -c -o $@ $<
+
+# ASM sources upper case .S
+$(BUILD)/obj/%_asm.o: %.S
+	@echo AS $(notdir $@)
+	@$(AS) $(IAR_ASFLAGS) -c -o $@ $<
+
+endif
+
 # UF2 generation, iMXRT need to strip to text only before conversion
 ifeq ($(FAMILY),imxrt)
 $(BUILD)/$(PROJECT).uf2: $(BUILD)/$(PROJECT).elf
@@ -122,27 +196,8 @@ 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 +206,6 @@ ifeq ($(CMDEXE),1)
 else
 	$(RM) -rf $(BUILD)
 endif
-# ---------------- GNU Make End -----------------------
 
 # get depenecies
 .PHONY: get-deps
diff --git a/hw/bsp/stm32f0/boards/stm32f070rbnucleo/board.mk b/hw/bsp/stm32f0/boards/stm32f070rbnucleo/board.mk
index 7c0ee40b6..242b5a034 100644
--- a/hw/bsp/stm32f0/boards/stm32f070rbnucleo/board.mk
+++ b/hw/bsp/stm32f0/boards/stm32f070rbnucleo/board.mk
@@ -1,11 +1,13 @@
 CFLAGS += -DSTM32F070xB -DCFG_EXAMPLE_VIDEO_READONLY
 
+SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f070xb.s
 LD_FILE = $(BOARD_PATH)/stm32F070rbtx_flash.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f070xb.s
+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/family.c b/hw/bsp/stm32f0/family.c
index 8de3147e2..806c4af51 100644
--- a/hw/bsp/stm32f0/family.c
+++ b/hw/bsp/stm32f0/family.c
@@ -153,7 +153,7 @@ 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..a81ab426f 100644
--- a/hw/bsp/stm32f0/family.mk
+++ b/hw/bsp/stm32f0/family.mk
@@ -8,17 +8,28 @@ ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
 include $(TOP)/$(BOARD_PATH)/board.mk
 
 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
 
 SRC_C += \
   src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c \