printf照写不误
但是需要添加如下函数：
int fputc(int ch, FILE *f)
{
/* Write a character to the USART */
USART_SendData(USART2, (uint8_t) ch);
/* Loop until the end of transmission */
while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET)
{
}
return ch;
}
int fgetc(FILE *f)
{
/* Waiting for user input */
while ( USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == RESET);
return (uint8_t)USART2->DR;
}
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楼主
