Stm32RS232串口通信——中断接收发送数据

main.c配置：

 /*
 *说明：
 *PA0:KEY1;PA1:KEY2;
 *PA2:LED1;PA3:LED2;
 *PA9:USART1_TX;PA10:USART1_RX
 */
 #include "stm32f10x.h"
 #include "stm32f10x_rcc.h"
 #include "stm32f10x_gpio.h"
 #include "stm32f10x_usart.h"
 #include "stm32f10x_exti.h"
 #include "system_stm32f10x.h"
 #include "misc.h"

 void RCC_Configuration(void);
 void GPIO_Configuration(void);
 void USART_Configuration(void);
 void NVIC_Configuration(void);

 int main()
 {
     SystemInit();//72m

     RCC_Configuration();
     GPIO_Configuration();
     USART_Configuration();
     NVIC_Configuration();

     while(1);
 }

 void RCC_Configuration(void)
 {
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO,ENABLE);
 }

 void GPIO_Configuration(void)
 {
   GPIO_InitTypeDef GPIO_InitStructure;

   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;             //管脚9
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;       //复用推挽输出
   GPIO_Init(GPIOA, &GPIO_InitStructure);                //TX初始化

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;            //管脚10
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
   GPIO_Init(GPIOA, &GPIO_InitStructure);                //RX初始化

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
   GPIO_Init(GPIOA, &GPIO_InitStructure);
 }

 void USART_Configuration(void)//串口初始化函数
 {
     //串口参数初始化
     USART_InitTypeDef USART_InitStructure;               //串口设置恢复默认参数
     //初始化参数设置
     USART_InitStructure.USART_BaudRate = 9600;                  //波特率9600
     USART_InitStructure.USART_WordLength = USART_WordLength_8b; //字长8位
     USART_InitStructure.USART_StopBits = USART_StopBits_1;      //1位停止字节
     USART_InitStructure.USART_Parity = USART_Parity_No;         //无奇偶校验
     USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无流控制
     USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//打开Rx接收和Tx发送功能
     USART_Init(USART1,&USART_InitStructure);                   //初始化

     USART_ITConfig(USART1,USART_IT_TXE,ENABLE);                //允许串口1发送中断。
     USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);               //允许串口1接收中断。
     USART_Cmd(USART1,ENABLE);                                  //启动串口
     USART_ClearFlag(USART1,USART_FLAG_TC);                     //发送完成标志位
 }
 void NVIC_Configuration(void)//配置中断优先级
 {
   NVIC_InitTypeDef NVIC_InitStructure;

   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

   NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
   NVIC_Init(&NVIC_InitStructure);
 }

stm32f10x_it.c的中断函数接收发送数据（接收和发送的时候改变LED状态）：

 #include "..\include\stm32f10x.h"
 #include "..\include\stm32f10x_it.h"
 #include "..\include\stm32f10x_gpio.h"
 #include "..\include\stm32f10x_usart.h"

 void USART1_IRQHandler(void)
 {
   u8 RX_dat;

   if(USART_GetITStatus(USART1,USART_IT_RXNE)==SET)//USART_IT_RXNE：接收中断
   {
     USART_ClearITPendingBit(USART1,USART_IT_RXNE);
     RX_dat=USART_ReceiveData(USART1);
     while(USART_GetFlagStatus(USART1,USART_FLAG_RXNE)==RESET){}  //接收数据寄存器非空标志位
     GPIO_WriteBit(GPIOA,GPIO_Pin_2,(BitAction)(Bit_SET-GPIO_ReadOutputDataBit(GPIOA,GPIO_Pin_2)));

     USART_SendData(USART1,RX_dat);
     while(USART_GetFlagStatus(USART1,USART_FLAG_TXE) == RESET){} //发送数据寄存器空标志位
     GPIO_WriteBit(GPIOA,GPIO_Pin_3,(BitAction)(Bit_SET-GPIO_ReadOutputDataBit(GPIOA,GPIO_Pin_3)));
   }
 }