Building a Library

Code
1

I want to make a library for my stm32 where i can use peripherals like
#include “hardware/gpio.h”
#include “hardware/uart.h”
i have all the code but need to build that trying cmake but failing can anyone please help with the structure and cmake

2

What have you done so far, do you have a draft of your project file (CMakeLists.txt)?
If you know absolutely nothing about CMake, I would recommend you to go through CMake Tutorial.

3

I did before I can Do if every file is in a single dir for example hardware(src, inc) but for a bit more complex structure i still can do but i want to do it in such way so that i can include them as #include “hardware/gpio.h” can you please help me about how the structure should be or should I compile them as library or just use them as include directory and so on

4

So how are you doing it at the moment? Show us what you’ve done so far.
Also, I must admit, I barely understood anything from your post.

5 
add_library(uart STATIC
  uart.c
  uart.h
  # Add other uart source files here
)

# Include directories for uart
target_include_directories(uart PUBLIC ${CMAKE_SOURCE_DIR}/core)
#This the cmakefile inside myproject/hardware/uart

# Add subdirectories for each peripheral
add_subdirectory(i2c)
add_subdirectory(uart)
add_subdirectory(clock)
add_subdirectory(spi)
#this is the cmakefile inside myproject/hardware

cmake_minimum_required(VERSION 3.20)

set(TARGET STM32F4XX)



include(arm-none-eabi.cmake)

project(${TARGET} VERSION 1.0.0 LANGUAGES ASM C CXX)

add_subdirectory(hardware)

add_executable(${TARGET} src/main.c)

target_include_directories(${TARGET} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/core ${CMAKE_CURRENT_SOURCE_DIR}/inc)


if(NOT CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE Debug)
endif()


target_link_libraries(${TARGET} i2c uart)

target_link_options(${TARGET} PRIVATE
                    -T${LINKER_SCRIPT}
                    -Wl,--gc-sections
                    -Wl,--print-memory-usage
                    -Wl,-Map=${TARGET}.map
                    # -specs=nano.specs
                    -lstdc++
                    -lc 
                    -lm
                    )
#this is the top level cmake file of my project

in this way it is working but i have to use relative path
#inlclude "../hardware/uart/uart.h"
but i want like
#include "hardware/uart.h"

6

Okay, that makes it more clear. Right then, looking at this:

add_library(uart STATIC
  uart.c
  uart.h
)

I assume that uart.h path is myproject/hardware/uart/uart.h, but then here:

target_include_directories(uart PUBLIC ${CMAKE_SOURCE_DIR}/core)

you are adding core, whose path seems to be myproject/core, so this looks like a typo, and instead it should be this, I guess:

# you probably shouldn't assume that your project will always be the top-level one to use CMAKE_SOURCE_DIR
target_include_directories(uart PUBLIC ${CMAKE_SOURCE_DIR})

and then STM32F4XX target should get it through linking to uart target, so you should be then able to do it almost as you wanted:

// because uart.h isn't located directly in `myproject/hardware/`, is it, as there is also `uart` subfolder
#include <hardware/uart/uart.h>

Note that if you are going to distribute your library/project, that won’t work for consuming project, as you’d need to set different paths with $<BUILD_INTERFACE:...>/$<INSTALL_INTERFACE:...> generator expressions.

7

Thanks for all the suggestions. I was trying it like pico-sdk for raspberry pi pico but that use really complex cmake so i guess i have to change the directory structure a bit to achieve what I really want