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cmake

use cmake as build system

project tree

basePrj/  
|---- CMakeLists.txt  
|---- libs  
|     ----  hello  
│     ----  CMakeLists.txt  
│     ----  inc  
            ---- hello.h  
      ----  src  
│           ---- hello.c  
|---- src  
      ---- main.c

// top-level CMake file
cmake_minimum_required(VERSION 3.16.4)

project(basePrj)

add_subdirectory(libs/hello)

set(SOURCES src/main.c)

add_executable(${PROJECT_NAME} ${SOURCES})
target_link_libraries(${PROJECT_NAME} hello)

build process

$ cd basePrj
$ mkdir build
$ cd build
$ cmake ..
$ make
$ ./basePrj
Hello World!

setup CMake

// cross compiling for arm set(CMAKE_SYSTEM_NAME Generic)
set(CMAKE_SYSTEM_PROCESSOR arm)
set(CMAKE_CROSSCOMPILING 1)

// toolchain set(GCC_PATH ${TOOLCHAIN_PATH}/gcc-arm-none-eabi-9-2019-q4-major/bin)
set(CMAKE_C_COMPILER ${GCC_PATH}/arm-none-eabi-gcc CACHE PATH "" FORCE)

// compiler flags for target set(CMAKE_C_FLAGS "-mcpu=cortex-m4 -march=armv7e-m -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16 -DPART_STM32F411VExx -ffunction-sections -fdata-sections -Wall -specs="nosys.specs"")

// compiler flags for debug or release build set(CMAKE_C_FLAGS_RELEASE "-Os")
set(CMAKE_C_FLAGS_DEBUG "-Og -g -gdwarf-3 -gstrict-dwarf")

// linker flags for target set(CMAKE_EXE_LINKER_FLAGS "--entry Reset_Handler -Wl,-T"../stm32f411vexx.ld"")

// objcopy with cmake --> ALL specify the target is run automatically with make
set(CMAKE_C_OBJCOPY ${GCC_PATH}/arm-none-eabi-objcopy CACHE PATH "" FORCE)

add_custom_target(${PROJECT_NAME}.bin ALL DEPENDS ${PROJECT_NAME}.elf)
add_custom_command(TARGET ${PROJECT_NAME}.bin
COMMAND ${CMAKE_C_OBJCOPY} ARGS -O binary ${PROJECT_NAME}.elf
${PROJECT_NAME}.bin)

// flash with cmake --> to be fixed with pyocd or openocd
// without ALL --> does not run automatically
// USES_TERMINAL --> see the output from JLinkExe add_custom_target(flash DEPENDS ${PROJECT_NAME}.bin) add_custom_command(TARGET flash USES_TERMINAL COMMAND JLinkExe -CommanderScript ../flash.jlink)

// debugging --> create a debug directory $ cd targetPrj
$ mkdir debug
$ cd debug
$ cmake -DCMAKE_BUILD_TYPE=Debug ..
$ make

// launch gdb server
$ JLinkGDBServer -if JTAG -device STM32F411VExx

// launch gdb $ arm-none-eabi-gdb targetPrj.elf
(gdb) target remote :2331
mon reset
load

// wrap to a cmake command --> using tmux
set(CMAKE_C_GDB ${GCC_PATH}/arm-none-eabi-gdb CACHE PATH "" FORCE)

add_custom_target(gdb DEPENDS ${PROJECT_NAME}.elf)
add_custom_command(TARGET gdb
COMMAND tmux -e JLinkGDBServer -if JTAG -device STM32F411VExx &
COMMAND tmux -e ${CMAKE_C_GDB} ${PROJECT_NAME}.elf -x ../gdbInit &)