Open STM32CubeMX and start a new STM32 project.
I'm using the STM32F4 Discovery board which has an STM32F407VG microcontroller and 4 onboard LEDs. For this project, I'm using the STM32 Cube Framework with the HAL libraries. I'm also developing on a PC running Ubuntu 20.04.3.
Select STM32F4-DISC1 from the board selector.
The STM32F4 Discovery board has the following LEDs available to the user:
LED |
NAME |
PIN |
|---|---|---|
| Green | LD4 | PD12 |
| Orange | LD3 | PD13 |
| Red | LD5 | PD14 |
| Blue | LD6 | PD15 |
For this tutorial we'll use the green LED (LD4 - port D, pin 12). In the MCU pinout viewer, set PD12 to GPIO_Output. Save and generate the code.
In the code editor, add the following to the main function in main.c:
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_12);
HAL_Delay(500);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
Build the program and download it to the board. You should see the green LED flashing every 1 second.
You probably already guessed it but the HAL_Delay() function pauses the execution
of the program for a given number of milliseconds (500 ms in the code above).
Adjusting this will speed up or slow down the blinking of the LED.