【AT-START-L021 测评】Linux下开发环境搭建(cmake+gcc+openocd)与点灯

只看该作者 · 2024-12-1 20:43

概述
开发板很漂亮，AT系的经典黑白色搭配。笔者一直是linux下开发，这次也不例外，但相对于以前用cmake+gcc+pyocd组合https://bbs.21ic.com/icview-3374312-1-1.html，这次换个花样，改用cmake+gcc+openocd。pyocd最大的优点是能利用Keil的现成pack，但弱点也很明显不支持板级扩展的nor flash烧写，而openocd在编写适当算法支持后，MCU内置flash和板级扩展的flash都能支持。另外openocd的速度天然比pycod快。一般而言做mcu的openocd flash烧录算法还是需要一番功夫的，好在AT官方其实做了openocd的支持，其代码仓库在

复制

https://github.com/ArteryTek/openocd

clone后编译即可，并不复杂，这里不再赘述

PS：其实笔者有个梦想--openocd一统浆糊。事实上笔者也是这么做的，自己维护了一个openocd仓库，把各家MCU的支持都合在一起了，这样编译出来的openocd可以用于笔者所用到的所有MCU。

Firmware Library
AT32L021的Firmware Library请从雅特力官方下载。

CMakeLists.txt
接下来就是书写CMakeLists.txt了，基于AT32F405改一改就可以用了，只是要注意CPU从cortex-m4变成
了cortex-m0+，除此以外就是一些宏定义，比如AT32F405RCT7_7改成AT32L021C8T7，AT_START_F405_V1改成AT_START_L021_V1，最后做好目录文件的一些变动，最后笔者的点灯用例的CMakeLists如下

复制

set(CMAKE_SYSTEM_NAME Generic)

set(CMAKE_SYSTEM_VERSION 1)

set(CMAKE_TRY_COMPILE_TARGET_TYPE "STATIC_LIBRARY")

cmake_minimum_required(VERSION 3.20)



set(CMAKE_C_COMPILER arm-none-eabi-gcc)

set(CMAKE_CXX_COMPILER arm-none-eabi-g++)

set(CMAKE_ASM_COMPILER arm-none-eabi-gcc)

set(CMAKE_AR arm-none-eabi-ar)

set(CMAKE_OBJCOPY arm-none-eabi-objcopy)

set(CMAKE_OBJDUMP arm-none-eabi-objdump)

set(SIZE arm-none-eabi-size)



set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)

set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)

set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)



add_compile_options(-mthumb -mcpu=cortex-m0plus -mfloat-abi=soft)

add_compile_options(-ffunction-sections -fdata-sections -fno-builtin -fno-common -Wall -Wshadow -Wdouble-promotion -Werror -Wno-unused-parameter)



add_compile_options(-O3)



project(at32l021 C ASM)

set(CMAKE_CXX_STANDARD 11)

set(CMAKE_C_STANDARD 99)



include_directories(libraries/cmsis/cm0plus/core_support

                    libraries/cmsis/cm0plus/device_support/

                    libraries/drivers/inc/

                    project/at32l021_board/

                    project/at_start_l021/examples/gpio/led_toggle/inc)



add_definitions(-DAT32L021C8T7 -DAT_START_L021_V1)



file(GLOB_RECURSE SOURCES

                "project/at32l021_board/at32l021_board.c"

                "project/at_start_l021/examples/gpio/led_toggle/src/*.c"

                "libraries/drivers/src/*.c"

                "libraries/cmsis/cm0plus/device_support/system_at32l021.c"

                "libraries/cmsis/cm0plus/device_support/startup/gcc/startup_at32l021.s"

                )



set(LINKER_SCRIPT ${CMAKE_SOURCE_DIR}/libraries/cmsis/cm0plus/device_support/startup/gcc/linker/AT32L021x8_FLASH.ld)

add_link_options(

                -mthumb -mcpu=cortex-m0plus -mfloat-abi=soft

                -Wl,--gc-sections,--print-memory-usage,-Map,${PROJECT_NAME}.map

                --specs=nano.specs

                --specs=nosys.specs)

add_link_options(-T ${LINKER_SCRIPT})



add_executable(${PROJECT_NAME}.elf ${SOURCES} ${LINKER_SCRIPT})



set(HEX_FILE ${PROJECT_BINARY_DIR}/${PROJECT_NAME}.hex)

set(BIN_FILE ${PROJECT_BINARY_DIR}/${PROJECT_NAME}.bin)

set(LST_FILE ${PROJECT_BINARY_DIR}/${PROJECT_NAME}.lst)

add_custom_command(TARGET ${PROJECT_NAME}.elf POST_BUILD

        COMMAND ${CMAKE_OBJCOPY} -Oihex [        DISCUZ_CODE_51        ]lt;TARGET_FILE:${PROJECT_NAME}.elf> ${HEX_FILE}

        COMMAND ${CMAKE_OBJCOPY} -Obinary [        DISCUZ_CODE_51        ]lt;TARGET_FILE:${PROJECT_NAME}.elf> ${BIN_FILE}

        COMMAND ${CMAKE_OBJDUMP} --all-headers --demangle --disassemble [        DISCUZ_CODE_51        ]lt;TARGET_FILE:${PROJECT_NAME}.elf> > ${LST_FILE}

        COMMAND ${SIZE} --format=berkeley [        DISCUZ_CODE_51        ]lt;TARGET_FILE:${PROJECT_NAME}.elf>

)

测试代码
把官方的点灯改一改以测试openocd烧录正常:

复制

int main(void)

{

  system_clock_config();



  at32_board_init();



  uart_print_init(115200);

  printf("Hello AT32L021\r\n");

  while(1)

  {

    at32_led_toggle(LED2);

    delay_ms(200);

    at32_led_toggle(LED3);

    delay_ms(200);

    at32_led_toggle(LED4);

    delay_ms(200);

  }

}

openocd烧录

复制

openocd -f interface/cmsis-dap.cfg -f target/at32l021xx.cfg -c "program build/at32l021.bin verify reset exit 0x8000000"

运行结果
串口有Hello AT32L021打印，三个LED交互闪烁，说明固件成功烧录了。