ESP32的SDK(ESP-IDF)本身提供了esp32平台的cmake toolchain文件:
esp-idf-v4.4\tools\cmake\toolchain-esp32.cmake
1就是esp32的工具链文件定义样板。如下:
set(CMAKE_SYSTEM_NAME Generic)set(CMAKE_C_COMPILER xtensa-esp32-elf-gcc)set(CMAKE_CXX_COMPILER xtensa-esp32-elf-g++)set(CMAKE_ASM_COMPILER xtensa-esp32-elf-gcc)set(CMAKE_C_FLAGS "-mlongcalls -Wno-frame-address" CACHE STRING "C Compiler Base Flags")set(CMAKE_CXX_FLAGS "-mlongcalls -Wno-frame-address" CACHE STRING "C++ Compiler Base Flags")
在项目应用中我们可以根据自己的需要在toolchain-esp32.cmake
的基础上修改以适应项目交叉的实际需要,比如我的项目中需要用到cJSON库,ESP-IDF中以组件(components)形式提供了cJSON库支持,所以在基于esp32时我需要用到这个ESP-IDF内置的cJSON库。那么在定义自己的工具链文件时就可以基于toolchain-esp32.cmake
做如下修改:
esp32.toolchain.cmake
# ESP32工具链定义,基于 esp-idf-v4.4/tools/cmake/toolchain-esp32.cmake 修改# author guyadong# date /02/12set(CMAKE_SYSTEM_NAME Generic)set(CMAKE_C_COMPILER xtensa-esp32-elf-gcc)set(CMAKE_CXX_COMPILER xtensa-esp32-elf-g++)set(CMAKE_ASM_COMPILER xtensa-esp32-elf-gcc)set(CMAKE_C_FLAGS "-mlongcalls -Wno-frame-address" CACHE STRING "C Compiler Base Flags")set(CMAKE_CXX_FLAGS "-mlongcalls -Wno-frame-address" CACHE STRING "C++ Compiler Base Flags")# IDF_PATH 环境变量为ESP-IDF的安装位置,执行export.sh(.bat)脚本即会定义if(NOT $ENV{IDF_PATH} STREQUAL "")set(IDF_PATH $ENV{IDF_PATH})endif()if(NOT IDF_PATH)message(FATAL_ERROR "NOT DEFINE SDK PREFIX FOR CROSS COMIPILER")endif()# degnci 需要cJSON库支持,所以这里需要将ESP32 SDK中cJSON头文件夹加入搜索路径include_directories("${IDF_PATH}/components/json/cJSON" )
附录
ESP32交叉编译器下载
Win64:
/espressif/crosstool-NG/releases/download/esp-r2/xtensa-esp32-elf-gcc8_4_0-esp-r2-patch2-win64.zipLinux X86_64
/espressif/crosstool-NG/releases/download/esp-r2/xtensa-esp32-elf-gcc8_4_0-esp-r2-patch2-linux-amd64.tar.gz
更多版本选择请访问:
/espressif/crosstool-NG/releases
ESP-IDF 4.4 下载
/github_assets/espressif/esp-idf/releases/download/v4.4/esp-idf-v4.4.zip
esp-idf-v4.4为ESP-IDF的安装路径 ↩︎