这样改应该就行了 int fputc(int ch, FILE *f) { USART_SendData(USART1, (u8) ch); while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET); return ch; } int fgetc(FILE *f) { while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE==RESET)); return (USART_ReceiveData(USART1)); }
