dekunukem/stm32_tutorials

STM32 tutorial with STM32Cube and Keil MDK-ARM

stm32_tutorials's Issues

fputc/printf() do not seem to work.

I did exactly as described, while using a Nucleo F042k6.

My main while loop includes:
`HAL_Delay(500);
HAL_UART_Transmit(&huart2,(uint8_t*)"hello\r",7,10);
HAL_Delay(500);

char lol[32];
sprintf(lol, "lol %u \r", (unsigned int)10);
HAL_UART_Transmit(&huart2, (uint8_t*)lol, strlen(lol),5);
HAL_Delay(500);
printf("Hello from printf");

with the fputc copied and pasted from your example. /* USER CODE BEGIN 0 */
int fputc(int ch, FILE *f)
{
HAL_UART_Transmit(&huart2, (unsigned char )&ch, 1, 100);
return ch;
}
/ USER CODE END 0 */
`
It all compiles fine. Uploads... no indication of a problem except printf simply does nothing.
The sprintf lol business was my old method of printing strings before I found your tutorial.

In the terminal, I get:
.lol 10 hello .lol 10 hello .lol 10 hello .lol 10 hello .lol 10 hello
Is this method tested? Any idea what's going wrong?

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)

Hi,

/**

• @brief EXTI line detection callback.
• @param GPIO_Pin Specifies the port pin connected to corresponding EXTI line.
• @RetVal None
  /
  __weak void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
  {
  / Prevent unused argument(s) compilation warning */
  UNUSED(GPIO_Pin);

/* NOTE: This function should not be modified, when the callback is needed,
the HAL_GPIO_EXTI_Callback could be implemented in the user file
*/
}

Great, let's write our own HAL_GPIO_EXTI_Callback then:
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
printf("oh my\n");
}

In the above code, At which pin trigger the above code function should be call?

Thanks

Lesson 1: UART Transmit

i tried this lesson using stm32f446re and stm32cubeide the led blinks but the uart transmit isn't working