mkdir STM32_example_cmake
cd STM32_example_cmake
git clone --recurse-submodules https://github.com/STMicroelectronics/STM32CubeF1
git clone https://github.com/ObKo/stm32-cmake
mkdir blink
cd blink

cat <<EOF >> blink.c
#include "stm32f1xx.h"
#include "stm32f1xx_ll_bus.h"
#include "stm32f1xx_ll_gpio.h"

void GPIO_config(void) {
  LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOC);
  LL_GPIO_SetPinMode(GPIOC, LL_GPIO_PIN_13, LL_GPIO_MODE_OUTPUT);
  LL_GPIO_SetPinOutputType(GPIOC, LL_GPIO_PIN_13, LL_GPIO_OUTPUT_PUSHPULL);
  LL_GPIO_SetPinSpeed(GPIOC, LL_GPIO_PIN_13, LL_GPIO_SPEED_FREQ_LOW);
}

int main(void) {
  GPIO_config();

  for (;;) {
    LL_GPIO_ResetOutputPin(GPIOC, LL_GPIO_PIN_13);
    for (volatile int i = 0; i < 100000; i++);
    LL_GPIO_SetOutputPin(GPIOC, LL_GPIO_PIN_13);
    for (volatile int i = 0; i < 100000; i++);
  }
}
EOF

cat <<EOF >> CMakeLists.txt
cmake_minimum_required(VERSION 3.16)

project(stm32-blink C ASM)
set(CMAKE_INCLUDE_CURRENT_DIR TRUE)

find_package(CMSIS COMPONENTS STM32F1 REQUIRED)
find_package(HAL COMPONENTS STM32F1 LL_RCC LL_GPIO REQUIRED)

add_executable(blink blink.c)
target_link_libraries(blink
    HAL::STM32::F1::LL_RCC
    HAL::STM32::F1::LL_GPIO
    CMSIS::STM32::F103C8
    STM32::NoSys
)
stm32_generate_hex_file(blink)
stm32_print_size_of_target(blink)
EOF

mkdir build
cd build
cmake -DCMAKE_TOOLCHAIN_FILE=../../STM32_example_cmake/stm32-cmake/cmake/stm32_gcc.cmake -DSTM32_CUBE_F1_PATH=../../STM32_example_cmake/STM32CubeF1/ -DCMAKE_BUILD_TYPE=Release ..
make