stm32什么触发串口接收中断

串口配置好即配置好GPIO和NVIC并初始化相应外设，然后每接受一个data就触发一次中断，转到中断入口处处理，然后清除中断标志位。一般情况下只有接受的时候采用中断方式，而发送只是放到buff寄存器里，不需要中断方式。以下是以前学习的时候串口通讯点灯的代码：

#include "usart.h"

void usart_config(void)

{

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA

| RCC_APB2Periph_AFIO,ENABLE);

usart_release_gpio_init();

usart_nvic_init();

usart_para_init();

}

void usart_release_gpio_init(void)

{

GPIO_InitTypeDef GPIO_InitStruct;

GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9;

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA,&GPIO_InitStruct);//配置好的参数初始化PA9

GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10;

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA,&GPIO_InitStruct);//配置好的参数初始化PA10

}

void usart_para_init(void)

{

USART_InitTypeDef USART_InitStruct;

USART_InitStruct.USART_BaudRate = 9600; //波特率9600

USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //无硬件流控

USART_InitStruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;

USART_InitStruct.USART_WordLength = USART_WordLength_8b; //8

USART_InitStruct.USART_Parity = USART_Parity_No; //n

USART_InitStruct.USART_StopBits = USART_StopBits_1; //1

USART_Init(USART1,&USART_InitStruct);//配置好的参数初始化USART1

USART_ClearFlag(USART1,USART_FLAG_TC);//清除发送完成标志位

USART_Cmd(USART1, ENABLE); //使能USART1

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//使能USART1接收中断

}

void usart_nvic_init(void)

{

NVIC_InitTypeDef NVIC_InitStruct;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); //设置组优先级

NVIC_InitStruct.NVIC_IRQChannel = USART1_IRQn; //设置串口1中断

NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级0

NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0; //子优先级0

NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE; //使能

NVIC_Init(&NVIC_InitStruct);//配置好的参数初始化NVIC

}

void USART1_IRQHandler ()

{

u8 RxData;

if(USART_GetFlagStatus(USART1, USART_IT_RXNE) != RESET) //判断是否有中断

{

RxData = USART_ReceiveData(USART1);

if(RxData == 0x00 )

{

GPIO_SetBits(GPIOB, GPIO_Pin_15);

}

else

{

GPIO_ResetBits(GPIOB, GPIO_Pin_15);

}

}

USART_ClearITPendingBit(USART1,USART_IT_RXNE); //清除接收终端标志位

}