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();//72mRCC_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_485GPIO_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2GPIO_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3GPIO_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9600USART_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 "..includestm32f10x.h" #include "..includestm32f10x_it.h"#include "..includestm32f10x_gpio.h"#include "..includestm32f10x_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);} }