项目在做什么
- 本项目是为了研究MCU在linux下开发而做的
--build 存放cmake编译生成的文件
--cmake 存放cmake编译时会用到的文件，比如工具链检查、编译选项等
--prj windows下kei工程的工程文件
--src 源码- 本项目中大量的CMakeLists.txt的写法参考了LoRa-Node
目前项目已经初步能够运行了
使用的组件
- VSCODE -> 程序员使用的文本编辑器
- cmake -> 组织编译逻辑
- arm-none-eabi --> 编译，生成elf,bin,hex
- JLinkGDBServer -> GDB 服务器
- cortex-debug -> 用来调试程序
我的环境
jk@jk:~$ sudo lsb_release -a
[sudo] jk 的密码：
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.2 LTS
Release: 18.04
Codename: bionic至此，需要的组件就罗列清除了，下面来讲下怎么安装
组件安装
VSCODE
官网瞎下载安装即可，每什么可讲的，记得安装最新版
CMake（需要>3.6）
jk@jk:~$ cmake -version
cmake version 3.10.2
CMake suite maintained and supported by Kitware (kitware.com/cmake).
安装方法：
- Ubuntu 16.04/ Linux Mint 18: Since the official repository version is too old, one can use e.g. PPA
- Linux Arch:
pacman -S cmake
arm-none-eabi
- GNU ARM-Toolchain
- GNU/Linux:
- Ubuntu 16.04/ Linux Mint 18: Since the official repository version is too old, one can use e.g. PPA
- Ubuntu 18.04: the toolchain has been updated but there is a bug with
libnewlibcausing the linker to fail.sudo apt install gcc-arm-none-eabi - Linux Arch:
pacman -S arm-none-eabi-gcc arm-none-eabi-newlib
JLinkGDBServer
jk@jk:~$ JLinkGDBServer -version
SEGGER J-Link GDB Server V6.48b Command Line Version
JLinkARM.dll V6.48b (DLL compiled Aug 2 2019 10:20:19)
去官网下载:JLinkGDBServer
我下载的是deb格式,使用dpkg -i安装即可
cortex-debug
VSCODE 里面搜索cortex-debug 安装即可
至此，安装就完成了
思路
首先，我们来看main函数
/**
* Main application entry point.
*/
int main( void )
{
board_init();
uart1.rx_complete_callback = uartCallback;
while(1)
{
HAL_UART_SendBytes((uint8_t*)"hello world\r\n",sizeof("hello world\r\n"));
DelayMs(5000);
}
}这个程序就是将硬件初始化，然后5s打印一次"Hello World\r\n"
也就是说这个程序主要分为三个部分：
- main
- 驱动
- MCU HAL 库
我们来看一下源码结构，也可以得出结论
jk@jk:~/programe/stm32-linux-cmake$ tree -d -L 2 src
src
├── apps
└── boards
├── driver
└── stm32其中:
apps中存放的就是main.c文件
boards中存放的是硬件部分
boards.driver存放的是硬件的驱动
boards.stm32中存放的就是stm32的HAL库的代码
所以，我的思路是：
- app/boards.driver/boards.stm32这三部分分别生成三个target，最后由这三个target生成exe
实现
AS WE KNOWN
编译需要指定.c文件，编译.c文件时由于多函数跨文件调用是通过头文件进行的，所以需要找寻头文件，当头文件找不到时就无法调用指定函数
将.c文件添加到指定target的方法，我这里用了两种，两种方式都可以达到一样的效果
一个个添加
list(APPEND ${PROJECT_NAME}_SOURCES "${CMAKE_CURRENT_SOURCE_DIR}/main.c" )添加指定文件夹下的所有c文件
file(GLOB ${PROJECT_NAME}_SOURCES "${CMAKE_CURRENT_LIST_DIR}/*.c")
将头文件路径添加倒target路径，是通过cmake的target_include_directories()方法，其中，我们可以通过${CMAKE_CURRENT_SOURCE_DIR},直接添加目录，但有时候，我们需要添加别的target的头文件，此时可以用表达式去获取target的头文件，比如
1. $<TARGET_PROPERTY:drivers,INTERFACE_INCLUDE_DIRECTORIES>通过这个表达式可以获取到在drivers这个target中添加的头文件
CMake的用法还有很多，太灵活了，我这写的也只是冰山一角，后面还要继续努力
### 干活
编译程序
在项目的根目录建立CMakeLists.txt,将apps,boards.driver,boards.stm32三个subdirectory分别导入，并在这三个文件夹中写好分别的CMakeLists.txt
我们分别将三个target命名为
- app -->project(app)
- drivers -->project(drivers)
- stm32l051 -->project(stm32l051)
并在其中添加好各自target的.c文件和头文件，具体见源码
ok之后，CMake文件就编写完了
我们需要执行
- mkdir build
- cd build
- cmake -DCMAKE_TOOLCHAIN_FILE="cmake/toolchain-arm-none-eabi.cmake" ..
PS:
- 在根目录生成build文件夹，这是为了方便我们管理，后续如果要删除编译的产物，直接删除build文件夹即可，也可以防止编译的产物污染代码
- Makefile生成成功提示如下:
jk@jk:~/programe/stm32-linux-cmake$ ./configure -- The C compiler identification is GNU 8.3.1 -- The CXX compiler identification is GNU 8.3.1 -- Check for working C compiler: /home/jk/cross-tool/gcc-arm-none-eabi-8-2019-q3-update/bin/arm-none-eabi-gcc -- Check for working C compiler: /home/jk/cross-tool/gcc-arm-none-eabi-8-2019-q3-update/bin/arm-none-eabi-gcc -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Detecting C compile features -- Detecting C compile features - done -- Check for working CXX compiler: /home/jk/cross-tool/gcc-arm-none-eabi-8-2019-q3-update/bin/arm-none-eabi-g++ -- Check for working CXX compiler: /home/jk/cross-tool/gcc-arm-none-eabi-8-2019-q3-update/bin/arm-none-eabi-g++ -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Detecting CXX compile features -- Detecting CXX compile features - done Linker script: /home/jk/programe/stm32-linux-cmake/src/boards/stm32/cmsis/arm-gcc/stm32l051xx_flash.ld -- The ASM compiler identification is GNU -- Found assembler: /home/jk/cross-tool/gcc-arm-none-eabi-8-2019-q3-update/bin/arm-none-eabi-gcc -- Configuring done -- Generating done -- Build files have been written to: /home/jk/programe/stm32-linux-cmake/build执行make,编译程序
jk@jk:~/programe/stm32-linux-cmake/build$ make Scanning dependencies of target app [ 3%] Building C object src/apps/CMakeFiles/app.dir/main.c.obj [ 3%] Built target app Scanning dependencies of target stm32l051 [ 6%] Building ASM object src/boards/stm32/CMakeFiles/stm32l051.dir/cmsis/arm-gcc/startup_stm32l051xx.s.obj [ 9%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/cmsis/system_stm32l0xx.c.obj [ 12%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal.c.obj [ 16%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_adc.c.obj [ 19%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_adc_ex.c.obj [ 22%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_cortex.c.obj [ 25%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_dma.c.obj [ 29%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_flash.c.obj [ 32%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_flash_ex.c.obj [ 35%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_gpio.c.obj [ 38%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_i2c.c.obj [ 41%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_pwr.c.obj [ 45%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_pwr_ex.c.obj [ 48%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_rcc.c.obj [ 51%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_rcc_ex.c.obj [ 54%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_rtc.c.obj [ 58%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_rtc_ex.c.obj [ 61%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_spi.c.obj [ 64%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_uart.c.obj [ 67%] Building C object src/boards/stm32/CMakeFiles/stm32l051.dir/mcu/stm32/STM32L0xx_HAL_Driver/Src/stm32l0xx_hal_uart_ex.c.obj [ 67%] Built target stm32l051 Scanning dependencies of target drivers [ 70%] Building C object src/boards/driver/CMakeFiles/drivers.dir/board.c.obj [ 74%] Building C object src/boards/driver/CMakeFiles/drivers.dir/delay.c.obj [ 77%] Building C object src/boards/driver/CMakeFiles/drivers.dir/gpio-board.c.obj [ 80%] Building C object src/boards/driver/CMakeFiles/drivers.dir/gpio.c.obj [ 83%] Building C object src/boards/driver/CMakeFiles/drivers.dir/key_board.c.obj [ 87%] Building C object src/boards/driver/CMakeFiles/drivers.dir/led_board.c.obj [ 90%] Building C object src/boards/driver/CMakeFiles/drivers.dir/stm32l0xx_hal_msp.c.obj [ 93%] Building C object src/boards/driver/CMakeFiles/drivers.dir/stm32l0xx_it.c.obj [ 96%] Building C object src/boards/driver/CMakeFiles/drivers.dir/uart_board.c.obj [ 96%] Built target drivers Scanning dependencies of target arm_minisys [100%] Linking C executable arm_minisys text data bss dec hex filename 14988 12 400 15400 3c28 arm_minisys [100%] Built target arm_minisys Scanning dependencies of target arm_minisys.hex [100%] Built target arm_minisys.hex Scanning dependencies of target arm_minisys.bin [100%] Built target arm_minisys.bin至此，程序编译完成
配置VSCODE
- 配置launch.json (应以调试)
- 配置c_cpp_properties.json(用于编写，阅读代码)
此处我使用的是JLinkGDBServer，是因为之前使用openocd进行调试时总是出现问题，而用JLinkGDBServer则没发现什么问题
launch.json
不讲了，自己看配置文件吧
c_cpp_properties.json
之前没有仔细配置时，总是在代码编辑器的右边出现红色的错误提示，很是难受，配完之后，这些错误提示都消失了，就舒服了。
下面我讲一下其中重的部分:
includePath,这个下面一定要靶所有的头文件的路径都包含进去，不然找不到头文件，就会出现波浪线的错误提示了，可以使用**的用法，来将目录下的所有文件都导入
"includePath": [ "${workspaceFolder}/src/**", "/home/jk/cross-tool/gcc-arm-none-eabi-8-2019-q3-update/arm-none-eabi/include/**" ],defines,需要把程序中使用的宏添加到此处，否则编辑器对预编译宏做的代码开关也是没法正确识别,例如：
"defines": [ "STM32L051xx", "USE_HAL_DRIVER" ],compilerPath,这个填写正确的gcc路径，否则也是有奇奇怪怪的错误
最后的注意事项
- 当CMake config/generate失败的时候，可以尝试将build文件夹删除，重新进行，可能会成功
- 因为此处我是通过传递工具链文件的方式来传递工具链给CMake的，指令有些长，且难记，为了方便，我将指令做成了config文件，在${ROOT}下有个config文件，这样，后面只要执行./config就可以生成Makefile文件了
- 代码结构要清晰，要尽量接耦，否则CMakeLists.txt文件编写时会互相调用，显得不整洁