[STM32] printf와 float 출력하기

Printf추가하기

 

다음 부분을 코드에 추가한다.

/* USER CODE BEGIN 0 */
#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif

/**
 * @brief Retargets the C library printf function to the USART
 * @param None
 * @retval None
 */
PUTCHAR_PROTOTYPE{
	if (ch == '\n') HAL_UART_Transmit(&huart2, (uint8_t*)"\r", 1, 0xFFFF);
	HAL_UART_Transmit(&huart2, (uint8_t*)&ch, 1, 0xFFFF);
	return ch;
}

 

float 출력하기

 

 

Use float with printf from newlib-nano를 체크해준다.