README.md

Hands-on: printf over Virtual COMport (UART1)

1. Add UART1 support on top of hands-on #1

2. Add the following code:

   • Inside USER CODE Block 3:

         /* USER CODE BEGIN 3 */
         HAL_Delay(500);
       HAL_GPIO_TogglePin(GPIOI, GPIO_PIN_1);
         printf("LD1: %d\n\r", HAL_GPIO_ReadPin(GPIOI, GPIO_PIN_1));
     }
       /* USER CODE END 3 */

   • Inside USER CODE Block 4:

     /* USER CODE BEGIN 4 */
     #ifdef __GNUC__
     #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
     #else
       #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
     #endif /* __GNUC__ */
     {
       HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xFFFF);
       return ch;
     }
     /* USER CODE END 4 */

   • Inside USER CODE Block Includes

     /* USER CODE BEGIN Includes */
     #include <stdio.h>
     /* USER CODE END Includes */

3. "Build Project" --> "Debug As --> 2 STM32 C/C++ Application" to enter Debug Perspective.

4. Before pressing "Resume" button to run your code, let's activate STM32CubeIDE UART console

   • Select "Command Shell Console" as shown below:
   • Set "Serial Port" in Connection Type and then press "New" button:
   • Assign proper "Connection name" and "Serial port" and then press "Finish" button as shown below:

5. Press "Resume" button in Debug Perspective and message will be printed in the console:

6. Let's move on to the next topic still regarding printf.