#include "stm32f10x.h"
#include "stdio.h"

void UART1_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
  
  USART_InitStructure.USART_BaudRate = 9600;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_2;
  USART_InitStructure.USART_Parity = USART_Parity_Odd;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

  /* Configure the USART1 */
  USART_Init(USART1, &USART_InitStructure);

  /* Enable the USART Transmoit interrupt: this interrupt is generated when the 
     USART1 transmit data register is empty */  
  USART_ITConfig(USART1, USART_IT_TXE, ENABLE);

  /* Enable the USART Receive interrupt: this interrupt is generated when the 
     USART1 receive data register is not empty */
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

  /* Enable USART1 */
  USART_Cmd(USART1, ENABLE);

}
int fputc(int ch, FILE *f) 
{ 
    USART_SendData(USART1, (u8) ch); 
 
     
    /* Loop until the end of transmission */ 
    while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET) 
    { 
    } 

    return ch; 
}

 
int main(void)
{  

 UART1_Configuration();

printf("nihao");





}
为什么我的这个用MDK中debug调试不显示打印nihao？