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I'm trying to get a simple program that uses GPIO running on a Pico W. But I've run into a build issue. I'm 99% sure the problem is in my CMakeList.txt file. But it isn't apparent to me where I've made a mistake. I did try clearing my build directory and tried building again. This arrives at the same result. The error I get is as follows.

[ 96%] Built target squarewave_pio_squarewave_pio_h
[ 97%] Building CXX object CMakeFiles/squarewave_pio.dir/main.cpp.o
/home/j2inet/shares/projects/j2inet/irdetect/main.cpp:2:10: fatal error: pico/stdlib.h: No such file or directory
    2 | #include "pico/stdlib.h"
      |          ^~~~~~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/squarewave_pio.dir/build.make:80: CMakeFiles/squarewave_pio.dir/main.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:1811: CMakeFiles/squarewave_pio.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

The source code for my project is on GitHub here in the addingGpio branch: https://github.com/j2inet/irdetect/tree/addingGpio

But I'll share what I think to be the most relevant part, which is my CMakeList.txt

cmake_minimum_required(VERSION 3.13)

include(pico_sdk_import.cmake)


project(test_project C CXX ASM)
set(CMAKE_C_STANDARD 11)
set(CMAKE_CXX_STANDARD 23)
pico_sdk_init()


add_executable(irdetect
   main.cpp
   squarewave.pio
   )


pico_enable_stdio_usb(irdetect 1)
pico_enable_stdio_uart(irdetect 1)
pico_add_extra_outputs(irdetect)


add_library(squarewave_pio squarewave.pio)
pico_generate_pio_header(squarewave_pio ${CMAKE_CURRENT_LIST_DIR}/pio/squarewave.pio)


target_sources(squarewave_pio PRIVATE main.cpp) 
target_link_libraries(irdetect pico_stdlib pico_cyw43_arch_none hardware_pio)
 pico_add_extra_outputs(squarewave_pio)

I build with the command cmake .. -DPICO_BOARD=pico_w && make from my ./build subfolder.

The include section of the source code doesn't contain anything that stands out as unusual to me.

#include <stdio.h>
#include "pico/stdlib.h"
#include "hardware/gpio.h"
#include "pico/binary_info.h"
#include "pico/cyw43_arch.h"

#include "build/squarewave.pio.h"
Joel
  • 131
  • 4

1 Answers1

1

I got this working! The root of the problem was that I had added the PIO program as a library that the build needed to produce. The PIO programs are converted to header files, not libraries. In adding a library target, the build process was trying to build my .cpp again, only that library hadn't been configured to link to the stdio resources. The solution was to remove the add_library directive and other elements that were associated with it.

Joel
  • 131
  • 4