这里不用keil自带的microLib这个代码，就是自己重新映射端口。
包含头文件 stdio.h
- #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__ */
- PUTCHAR_PROTOTYPE
- {
- USART_SendData_8bit(DEBUG_USARTx, (uint8_t)ch);
- while (USART_GetFlagStatus(DEBUG_USARTx, USART_FLAG_TXE) == RESET);
- return ch;
- }
| 
楼主
