我初学STM32F107的板子，做了USART的实验，就是通过按键中断向PC终端发送程序。程序做完后，用keil编译没什么问题，但是数据总是发不了？程序就在下边，麻烦各位大神看看。。
 
#include "stm32f10x_lib.h"
#include "stm32f10x.h"
#include
EXTI_InitTypeDef EXTI_InitStructure;
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
void USART_Configuration(void);
 
int main (void)
{
RCC_Configuration();
GPIO_Configuration();
NVIC_Configuration();
USART_Configuration();
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource7);
EXTI_InitStructure.EXTI_Line = EXTI_Line7;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
EXTI_GenerateSWInterrupt(EXTI_Line7);
printf("System: nothing is impossible!\n");
        while(1)
        {
        }
}
 
void RCC_Configuration(void)
{
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB| RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOD, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
 
}
 
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_PinRemapConfig(GPIO_Remap_USART2,ENABLE);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOD,&GPIO_InitStructure);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOD,&GPIO_InitStructure);
}
 
void NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;
        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
          NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
          NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
         NVIC_Init(&NVIC_InitStructure);
}
 
void USART_Configuration(void)
{
  USART_InitTypeDef USART_InitStructure;
  USART_ClockInitTypeDef USART_ClockInitStructure;
  USART_InitStructure.USART_BaudRate = 115200;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; 
  USART_Init(USART2,&USART_InitStructure);
  USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;          
  USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
  USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
  USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
  USART_ClockInit(USART2,&USART_ClockInitStructure);
  USART_Cmd(USART2, ENABLE);
}
 
 
int fput(int ch, FILE * f)
 {
 USART_SendData(USART2,(u8)ch);
 while(USART_GetFlagStatus(USART2,USART_FLAG_TC) == RESET)
 {
 }         
        return ch;
 }
 
 这下变的是中断程序
#include "stm32f10x_it.h"
#include
 
void EXTI9_5_IRQHandler(void)
{
 if (EXTI_GetITStatus(EXTI_Line7) != RESET) 
 printf ( "\n the 7th external interrupt happend!\n");
 EXTI_ClearITPendingBit( EXTI_Line7 ) ;
}

 
 

printf ( "\n the 7th external interrupt happend!\n");
这个用的是串口0吧