首先将串口初始化,然后添加重定向代码
下面使用的是串口三,因此以串口三为例:
- UART_HandleTypeDef huart3;
- #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;
- }
复制代码
添加完代码后就可以使用printf进行打印了~
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