Add support for DEBUG_PRINT using SEGGER RTT

Makefile

@@ -227,6 +227,12 @@ PROJ_OBJ += configblockeeprom.o crc_bosch.o
 PROJ_OBJ += sleepus.o
 PROJ_OBJ += pulse_processor.o lighthouse_geometry.o
 
+ifeq ($(DEBUG_PRINT_ON_SEGGER_RTT), 1)
+VPATH += $(LIB)/Segger_RTT/RTT
+INCLUDES += -I$(LIB)/Segger_RTT/RTT
+PROJ_OBJ += SEGGER_RTT.o SEGGER_RTT_printf.o
+CFLAGS += -DDEBUG_PRINT_ON_SEGGER_RTT
+endif
 
 # Libs
 PROJ_OBJ += libarm_math.a
@@ -241,7 +247,7 @@ SIZE = $(CROSS_COMPILE)size
 OBJCOPY = $(CROSS_COMPILE)objcopy
 GDB = $(CROSS_COMPILE)gdb
 
-INCLUDES  = -I$(FREERTOS)/include -I$(PORT) -Isrc
+INCLUDES += -I$(FREERTOS)/include -I$(PORT) -Isrc
 INCLUDES += -Isrc/config -Isrc/hal/interface -Isrc/modules/interface
 INCLUDES += -Isrc/utils/interface -Isrc/drivers/interface -Isrc/platform
 INCLUDES += -Ivendor/CMSIS/CMSIS/Include -Isrc/drivers/bosch/interface

src/lib/Segger_RTT/License.txt

@@ -0,0 +1,44 @@
+Important - Read carefully:
+
+SEGGER RTT - Real Time Transfer for embedded targets
+
+All rights reserved.
+
+SEGGER strongly recommends to not make any changes
+to or modify the source code of this software in order to stay
+compatible with the RTT protocol and J-Link.
+
+Redistribution and use in source and binary forms, with or
+without modification, are permitted provided that the following
+conditions are met:
+
+o Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+
+o 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.
+
+o Neither the name of SEGGER Microcontroller GmbH
+  nor the names of its contributors may be used to endorse or
+  promote products derived from this software without specific
+  prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+CONTRIBUTORS "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 SEGGER Microcontroller 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.
+
+
+(c) 2014 - 2016  SEGGER Microcontroller GmbH
+www.segger.com

src/lib/Segger_RTT/README.txt

@@ -0,0 +1,20 @@
+README.txt for the SEGGER RTT Implementation Pack.
+
+Included files:
+===============
+Root Directory
+  - Examples
+    - Main_RTT_InputEchoApp.c    - Sample application which echoes input on Channel 0.
+    - Main_RTT_MenuApp.c         - Sample application to demonstrate RTT bi-directional functionality.
+    - Main_RTT_PrintfTest.c      - Sample application to test RTT small printf implementation.
+    - Main_RTT_SpeedTestApp.c    - Sample application for measuring RTT performance. embOS needed.
+  - RTT
+    - SEGGER_RTT.c                - The RTT implementation.
+    - SEGGER_RTT.h                - Header for RTT implementation.
+    - SEGGER_RTT_Conf.h           - Pre-processor configuration for the RTT implementation.
+    - SEGGER_RTT_Printf.c         - Simple implementation of printf to write formatted strings via RTT.
+  - Syscalls
+    - RTT_Syscalls_GCC.c          - Low-level syscalls to retarget printf() to RTT with GCC / Newlib.
+    - RTT_Syscalls_IAR.c          - Low-level syscalls to retarget printf() to RTT with IAR compiler.
+    - RTT_Syscalls_KEIL.c         - Low-level syscalls to retarget printf() to RTT with KEIL/uVision compiler.
+    - RTT_Syscalls_SES.c          - Low-level syscalls to retarget printf() to RTT with SEGGER Embedded Studio.