Stm32RS232串口通信——中断接收发送数据
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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"
voidRCC_Configuration(void);
voidGPIO_Configuration(void);
voidUSART_Configuration(void);
voidNVIC_Configuration(void);
intmain()
{
SystemInit();//72m
RCC_Configuration();
GPIO_Configuration();
USART_Configuration();
NVIC_Configuration();
while(1);
}
voidRCC_Configuration(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO,ENABLE);
}
voidGPIO_Configuration(void)
{
GPIO_InitTypeDefGPIO_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);
}
voidUSART_Configuration(void)//串口初始化函数
{
//串口参数初始化
USART_InitTypeDefUSART_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
}
voidNVIC_Configuration(void)//配置中断优先级
{
NVIC_InitTypeDefNVIC_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"..includestm32f10x.h"
#include"..includestm32f10x_it.h"
#include"..includestm32f10x_gpio.h"
#include"..includestm32f10x_usart.h"
voidUSART1_IRQHandler(void)
{
u8RX_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)));
}
}