1.CUBEMx配置串口的IO口
选择USART3并配置为Asynchronous
设置时钟为216MHz
串口设置为8位数据,1位停止位
2.生成代码,并添加串口重定向程序,以便使用printf
3.实验成功
串口重定向代码如下
/*-----------------串口重定向 使用printf输出---------------*/
#ifdef __GNUC__
/* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf
set to 'Yes') calls __io_putchar() */
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */
/**
* @brief Retargets the C library printf function to the USART.
* @param None
* @retval None
*/
PUTCHAR_PROTOTYPE
{
/* Place your implementation of fputc here */
/* e.g. write a character to the EVAL_COM1 and Loop until the end of transmission */
HAL_UART_Transmit(&huart3, (uint8_t *)&ch, 1, 0x0001);
return ch;
}
/*-----------------------------------------------------------*/