Stm32RS232串口通信——中断接收发送数据

main.c配置：

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/* 

*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）：

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#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)));  

  }     

}