Stm32RS485串口通信——中断接收发送数据

/*
*说明：
*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();

GPIO_ResetBits(GPIOE,GPIO_Pin_5);
while(1);
}

void RCC_Configuration(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOE|RCC_APB2Periph_AFIO,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
}

void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;             //CS_485
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;      //推挽输出
GPIO_Init(GPIOE, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;             //管脚2
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_3;             //管脚3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
GPIO_Init(GPIOA, &GPIO_InitStructure);                //RX初始化
}

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(USART2,&USART_InitStructure);                   //初始化

USART_ITConfig(USART2,USART_IT_TXE,ENABLE);                //允许串口1发送中断。
USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);               //允许串口1接收中断。
USART_Cmd(USART2,ENABLE);                                  //启动串口
USART_ClearFlag(USART2,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 = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

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

void delay_ms(u16 time)
{
u16 i=0;
while(time--)
{
i=12000;
while(i--);
}
}

void USART2_IRQHandler(void)
{
u8 RX_dat;

if(USART_GetITStatus(USART2,USART_IT_RXNE)==SET)//USART_IT_RXNE：接收中断
{
RX_dat=USART_ReceiveData(USART2);
GPIO_SetBits(GPIOE,GPIO_Pin_5);
delay_ms(1);

USART_SendData(USART2,RX_dat);
while(USART_GetFlagStatus(USART2,USART_FLAG_TXE) == RESET){} //发送数据寄存器空标志位
delay_ms(2);
GPIO_ResetBits(GPIOE,GPIO_Pin_5);
}
}