How to include Espressif vendor components and files?

yanjos · February 25, 2020, 4:33am

For #include “common/common.h” to work, you would need to have the common.h header file inside of a folder named “common” and the path to the folder in your compiler’s include path.

The #include “freertos/FreeRTOS.h” statement compiles because the header file exists in a folder called “freertos” and the path to that folder is in your compiler’s include path.

For including the lwip component, you will need to build with the “AFR_ESP_LWIP” flag set to one. For example:
“cmake -S . -B build -DAFR_ESP_LWIP=1 -DCMAKE_TOOLCHAIN_FILE=freertos/tools/cmake/toolchains/xtensa-esp32.cmake -GNinja”

The lwip component is an exception because of a conditional used for choosing between the FreeRTOS+ TCP stack and the lwip stack.

github.com

aws/amazon-freertos/blob/987d9697ad4dc924bd71333c57b2f68bbe81b172/vendors/espressif/boards/esp32/CMakeLists.txt#L52


      
              $<$<COMPILE_LANGUAGE:CXX>:${IDF_CXX_COMPILE_OPTIONS}>
          )
          
          # Compiler definitions/macros
          target_compile_definitions(
              AFR::compiler::mcu_port
              INTERFACE
              ${IDF_COMPILE_DEFINITIONS}
          )
          
          if(AFR_ESP_LWIP)
          target_compile_definitions(
              AFR::compiler::mcu_port
              INTERFACE $<$<COMPILE_LANGUAGE:C>:${compiler_defined_symbols}>
              -DAFR_ESP_LWIP
          )
          endif()
          
          # Linker flags
          target_link_options(
              AFR::compiler::mcu_port

You can see an example of how to use the lwip component in Archit’s response here: