From 387b0525e97126cae2d57d616094f05eaedfe7d6 Mon Sep 17 00:00:00 2001
From: Matthias Ringwald <matthias@ringwald.ch>
Date: Mon, 5 Feb 2018 15:16:23 +0100
Subject: [PATCH] stm32-l053r8-em9304: support ENABLE_SEGGER_RTT

---
 port/stm32-l053r8-em9304/btstack_config.h              | 1 +
 port/stm32-l053r8-em9304/cubemx-l053r8-em9304/Makefile | 4 ++++
 port/stm32-l053r8-em9304/port.c                        | 8 ++++++++
 3 files changed, 13 insertions(+)

diff --git a/port/stm32-l053r8-em9304/btstack_config.h b/port/stm32-l053r8-em9304/btstack_config.h
index 0acc5e481..445e0cd0e 100644
--- a/port/stm32-l053r8-em9304/btstack_config.h
+++ b/port/stm32-l053r8-em9304/btstack_config.h
@@ -16,6 +16,7 @@
 #define ENABLE_LE_DATA_LENGTH_EXTENSION
 #define ENABLE_LOG_INFO
 #define ENABLE_LOG_ERROR
+// #define ENABLE_SEGGER_RTT
 
 // BTstack configuration. buffers, sizes, ...
 #define HCI_ACL_PAYLOAD_SIZE 100
diff --git a/port/stm32-l053r8-em9304/cubemx-l053r8-em9304/Makefile b/port/stm32-l053r8-em9304/cubemx-l053r8-em9304/Makefile
index 6c6ead0a3..a5ea2be27 100644
--- a/port/stm32-l053r8-em9304/cubemx-l053r8-em9304/Makefile
+++ b/port/stm32-l053r8-em9304/cubemx-l053r8-em9304/Makefile
@@ -51,6 +51,7 @@ VPATH += ${BTSTACK_ROOT}/src/classic
 VPATH += ${BTSTACK_ROOT}/platform/embedded
 VPATH += ${BTSTACK_ROOT}/example
 VPATH += ${BTSTACK_ROOT}/3rd-party/micro-ecc
+VPATH += ${BTSTACK_ROOT}/3rd-party/segger-rtt
 VPATH += ${BTSTACK_ROOT}/chipset/em9301
 
 ######################################
@@ -109,6 +110,8 @@ Src/stm32l0xx_it.c \
 	sm.c \
 	uECC.c \
 	0000000_META_hci_patches_v5_iram.c \
+SEGGER_RTT.c \
+SEGGER_RTT_Syscalls_GCC.c \
 
 # ASM sources
 ASM_SOURCES =  \
@@ -178,6 +181,7 @@ C_INCLUDES += -I${BTSTACK_ROOT}/src/ble/gatt-service
 C_INCLUDES += -I${BTSTACK_ROOT}/src/classic
 C_INCLUDES += -I${BTSTACK_ROOT}/src
 C_INCLUDES += -I${BTSTACK_ROOT}/3rd-party/micro-ecc
+C_INCLUDES += -I${BTSTACK_ROOT}/3rd-party/segger-rtt
 C_INCLUDES += -I${BTSTACK_ROOT}/platform/embedded
 
 # compile gcc flags
diff --git a/port/stm32-l053r8-em9304/port.c b/port/stm32-l053r8-em9304/port.c
index a27d0cda8..17ca34b49 100644
--- a/port/stm32-l053r8-em9304/port.c
+++ b/port/stm32-l053r8-em9304/port.c
@@ -59,11 +59,17 @@
 #include "hci_dump.h"
 #include "btstack_debug.h"
 
+#ifdef ENABLE_SEGGER_RTT
+#include "SEGGER_RTT.h"
+#endif
+
 // retarget printf
 #include <stdio.h>
 #include <unistd.h>
 #include <errno.h>
 
+#ifndef ENABLE_SEGGER_RTT
+
 int _write(int file, char *ptr, int len){
     uint8_t cr = '\r';
     if (file == STDOUT_FILENO || file == STDERR_FILENO) {
@@ -80,6 +86,8 @@ int _write(int file, char *ptr, int len){
     return -1;
 }
 
+#endif
+
 int _read(int file, char * ptr, int len){
     (void)(file);
     (void)(ptr);