代码如下,设置中断监听PD4上的按钮按下事件,当按钮事件发生令LED闪烁(PD2), 但是当我用上位机给mcu串口发送信息,也会触发该中断从而引发LED闪烁.串口引脚为PD5,PD6,USB转串口的芯片为CH340E.
代码如下:
/********************************** (C) COPYRIGHT *******************************
* File Name : main.c
* Author : WCH
* Version : V1.0.0
* Date : 2022/08/08
* Description : Main program body.
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* SPDX-License-Identifier: Apache-2.0
*******************************************************************************/
#include "debug.h"
void INIT()
{
INTERRUPT_INIT();
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);
GPIO_INIT(GPIOD,GPIO_Pin_2, GPIO_Mode_Out_PP);
GPIO_WriteBit(GPIOD, GPIO_Pin_2, Bit_RESET);
}
void INTERRUPT_INIT(){
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOD, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure = {0};
EXTI_InitTypeDef EXTERNAL_EXTI_InitStructure = {0};
NVIC_InitTypeDef NVIC_InitStructure = {0};
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; // pull down
GPIO_Init(GPIOD, &GPIO_InitStructure);
/* PD4 ----> EXTI_Line4 */
GPIO_EXTILineConfig(GPIO_PortSourceGPIOD, GPIO_PinSource4);
EXTERNAL_EXTI_InitStructure.EXTI_Line = EXTI_Line4;
EXTERNAL_EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTERNAL_EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTERNAL_EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTERNAL_EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI7_0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void EXTI7_0_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
/*********************************************************************
* @fn EXTI0_IRQHandler
*
* @brief This function handles EXTI0 Handler.
*
* @return none
*/
void EXTI7_0_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line4)!=RESET)
{
EXTI_ClearITPendingBit(EXTI_Line4); /* Clear Flag */
LED_Blink();
}
}
void LED_Blink(){
u8 i = 6;
while(i--){
GPIO_WriteBit(GPIOD, GPIO_Pin_2, Bit_SET);
Delay_Ms(300);
GPIO_WriteBit(GPIOD, GPIO_Pin_2, Bit_RESET);
Delay_Ms(300);
}
}
/*********************************************************************
* @fn GPIO_INIT
*
* @brief Initializes GPIO by given params
*
* @return none
*/
void GPIO_INIT(GPIO_TypeDef *GPIOx, u16 PIN_NUM, GPIOMode_TypeDef IO_MODE)
{
GPIO_InitTypeDef GPIO_InitStructure = {0};
GPIO_InitStructure.GPIO_Pin = PIN_NUM;
GPIO_InitStructure.GPIO_Mode = IO_MODE;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIOx, &GPIO_InitStructure);
}
/*********************************************************************
* @fn main
*
* @brief Main program.
*
* @return none
*/
int main(void)
{
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
Delay_Init();
INIT();
while(1);
}
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