stm32l4-base

A clean (and very simple) base for stm32l4xx projects based on cmake

To start with your STM32L4xx project

1. Clone this repository:

git clone --recursive https://github.com/soundslikefrank/stm32l4-base.git my-cool-project

2. Now we need to make a few adjustments. Use STM32CubeMX to generate code for your MCU/board (leave all default values), but use Makefile as Toolchain / IDE
3. Copy these files to the corresponding locations (adjust file names):

STM32CubeMXProject/startup_stm32l4xxxx.s -> ./startup_stm32l4xxxx.s STM32CubeMXProject/STM32L4xxxxxx_FLASH.ld -> ./STM32L4xxxxxx_FLASH.ld

Then you can remove the old corresponding old files that come with this project.

3. Adjust the references to these files in the CMakeLists.txt:

# Set startup file in project files:
set(PROJECT_FILES
  # ...

  startup_stm32l4xxxx.s
  )

and

# If you're not sure which identifier to use, look into the STM32CubeMX generated Makefile
target_compile_definitions(${EXECUTABLE} PRIVATE
  -DUSE_HAL_DRIVER
  -DSTM32L4xxxx # change this!
  )

and

target_link_options(${EXECUTABLE} PRIVATE
  -T${CMAKE_SOURCE_DIR}/STM32L4xxxxxx_FLASH.ld

4. -optional- You might want to do some clock configuration (using STM32CubeMX or editing the file system_stm32l4xx.c directly), especially if you're using an external crystal

5. -optional- Uncomment HAL modules that you don't need in include/stm32l4xx_hal_conf.h and CMakeLists.txt

6. To build (we are assuming an out-of-source build):

mkdir build && cd build
cmake -DCMAKE_TOOLCHAIN_FILE=../arm-none-eabi-gcc.cmake ..
make # or directly
make upload # use OpenOCD to flash!

You only ever need to run the cmake command again after you made changes to the CMakeLists.txt.