【STM32项目设计】STM32F411健康助手--三脚--波轮开关--外部中断输入（3）

硬件设计

软件设计

key.c 波轮按键默认为低电平，需要配置为下拉输入，如果浮空的话电压会在1.8v上下波动，单片机检测会出现异常。波动时为高电平，设置为高电平触发。

key0是一个普通按键，忽略即可，key1~3为波轮开关的三个按键。

#include "key.h"

 /**
  * @brief  配置嵌套向量中断控制器NVIC
  * @param  无
  * @retval 无
  */
static void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
  
  /* 配置NVIC为优先级组1 */
	/* 提示 NVIC_PriorityGroupConfig() 在整个工程只需要调用一次来配置优先级分组*/
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
  
  /* 配置中断源：按键1 */
  NVIC_InitStructure.NVIC_IRQChannel = KEY0_INT_EXTI_IRQ;
  /* 配置抢占优先级：1 */
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  /* 配置子优先级：1 */
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  /* 使能中断通道 */
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  
  /* 配置中断源：按键2，其他使用上面相关配置 */  
  NVIC_InitStructure.NVIC_IRQChannel = KEY1_INT_EXTI_IRQ;
  NVIC_Init(&NVIC_InitStructure);
  NVIC_InitStructure.NVIC_IRQChannel = KEY2_INT_EXTI_IRQ;
  NVIC_Init(&NVIC_InitStructure);
  NVIC_InitStructure.NVIC_IRQChannel = KEY3_INT_EXTI_IRQ;
  NVIC_Init(&NVIC_InitStructure);
}

 /**
  * @brief  配置 PA0 为线中断口，并设置中断优先级
  * @param  无
  * @retval 无
  */
void EXTI_Key_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure; 
EXTI_InitTypeDef EXTI_InitStructure;
  
	/*开启按键GPIO口的时钟*/
  RCC_AHB1PeriphClockCmd(KEY0_INT_GPIO_CLK|KEY1_INT_GPIO_CLK|KEY1_INT_GPIO_CLK|KEY3_INT_GPIO_CLK ,ENABLE);
  
  /* 使能 SYSCFG 时钟 ，使用GPIO外部中断时必须使能SYSCFG时钟*/
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
  
  /* 配置 NVIC */
  NVIC_Configuration();
  
/* 选择按键0的引脚 */ 
  GPIO_InitStructure.GPIO_Pin = KEY0_INT_GPIO_PIN;
  /* 设置引脚为输入模式 */ 
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;	    		
  /* 设置引脚不上拉也不下拉 */
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  /* 使用上面的结构体初始化按键 */
  GPIO_Init(KEY1_INT_GPIO_PORT, &GPIO_InitStructure); 

	/* 连接 EXTI 中断源 到key0引脚 */
  SYSCFG_EXTILineConfig(KEY0_INT_EXTI_PORTSOURCE,KEY0_INT_EXTI_PINSOURCE);

  /* 选择 EXTI 中断源 */
  EXTI_InitStructure.EXTI_Line = KEY0_INT_EXTI_LINE;
  /* 中断模式 */
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  /* 上升沿触发 */
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;  
  /* 使能中断/事件线 */
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);
  
  	/* 选择按键1的引脚 */ 
  GPIO_InitStructure.GPIO_Pin = KEY1_INT_GPIO_PIN;
  /* 设置引脚为输入模式 */ 
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;	    		
  /* 设置引脚不上拉也不下拉 */
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
  /* 使用上面的结构体初始化按键 */
  GPIO_Init(KEY1_INT_GPIO_PORT, &GPIO_InitStructure); 

	/* 连接 EXTI 中断源 到key1引脚 */
  SYSCFG_EXTILineConfig(KEY1_INT_EXTI_PORTSOURCE,KEY1_INT_EXTI_PINSOURCE);

  /* 选择 EXTI 中断源 */
  EXTI_InitStructure.EXTI_Line = KEY1_INT_EXTI_LINE;
  /* 中断模式 */
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  /* 上升沿触发 */
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;  
  /* 使能中断/事件线 */
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);
  
  	/* 选择按键2的引脚 */ 
  GPIO_InitStructure.GPIO_Pin = KEY2_INT_GPIO_PIN;
  /* 设置引脚为输入模式 */ 
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;	    		
  /* 设置引脚不上拉也不下拉 */
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
  /* 使用上面的结构体初始化按键 */
  GPIO_Init(KEY1_INT_GPIO_PORT, &GPIO_InitStructure); 

	/* 连接 EXTI 中断源 到key1引脚 */
  SYSCFG_EXTILineConfig(KEY2_INT_EXTI_PORTSOURCE,KEY2_INT_EXTI_PINSOURCE);

  /* 选择 EXTI 中断源 */
  EXTI_InitStructure.EXTI_Line = KEY2_INT_EXTI_LINE;
  /* 中断模式 */
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  /* 上升沿触发 */
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;  
  /* 使能中断/事件线 */
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);
  
  
  	/* 选择按键3的引脚 */ 
  GPIO_InitStructure.GPIO_Pin = KEY3_INT_GPIO_PIN;
  /* 设置引脚为输入模式 */ 
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;	    		
  /* 设置引脚不上拉也不下拉 */
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
  /* 使用上面的结构体初始化按键 */
  GPIO_Init(KEY1_INT_GPIO_PORT, &GPIO_InitStructure); 

	/* 连接 EXTI 中断源 到key3引脚 */
  SYSCFG_EXTILineConfig(KEY3_INT_EXTI_PORTSOURCE,KEY3_INT_EXTI_PINSOURCE);

  /* 选择 EXTI 中断源 */
  EXTI_InitStructure.EXTI_Line = KEY3_INT_EXTI_LINE;
  /* 中断模式 */
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  /* 上升沿触发 */
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;  
  /* 使能中断/事件线 */
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);
}
/*********************************************END OF FILE**********************/

key.h

#ifndef __KEY_H
#define __KEY_H

#include "main.h"

#define KEY0_INT_GPIO_PORT                GPIOA
#define KEY0_INT_GPIO_CLK                 RCC_AHB1Periph_GPIOA
#define KEY0_INT_GPIO_PIN                 GPIO_Pin_7
#define KEY0_INT_EXTI_PORTSOURCE          EXTI_PortSourceGPIOA
#define KEY0_INT_EXTI_PINSOURCE           EXTI_PinSource7
#define KEY0_INT_EXTI_LINE                EXTI_Line7
#define KEY0_INT_EXTI_IRQ                 EXTI9_5_IRQn
#define KEY0_IRQHandler                   EXTI9_5_IRQHandler

#define KEY1_INT_GPIO_PORT                GPIOB
#define KEY1_INT_GPIO_CLK                 RCC_AHB1Periph_GPIOB
#define KEY1_INT_GPIO_PIN                 GPIO_Pin_0
#define KEY1_INT_EXTI_PORTSOURCE          EXTI_PortSourceGPIOB
#define KEY1_INT_EXTI_PINSOURCE           EXTI_PinSource0
#define KEY1_INT_EXTI_LINE                EXTI_Line0
#define KEY1_INT_EXTI_IRQ                 EXTI0_IRQn
#define KEY1_IRQHandler                   EXTI0_IRQHandler

#define KEY2_INT_GPIO_PORT                GPIOB
#define KEY2_INT_GPIO_CLK                 RCC_AHB1Periph_GPIOB
#define KEY2_INT_GPIO_PIN                 GPIO_Pin_1
#define KEY2_INT_EXTI_PORTSOURCE          EXTI_PortSourceGPIOB
#define KEY2_INT_EXTI_PINSOURCE           EXTI_PinSource1
#define KEY2_INT_EXTI_LINE                EXTI_Line1
#define KEY2_INT_EXTI_IRQ                 EXTI1_IRQn
#define KEY2_IRQHandler                   EXTI1_IRQHandler

#define KEY3_INT_GPIO_PORT                GPIOB
#define KEY3_INT_GPIO_CLK                 RCC_AHB1Periph_GPIOB
#define KEY3_INT_GPIO_PIN                 GPIO_Pin_2
#define KEY3_INT_EXTI_PORTSOURCE          EXTI_PortSourceGPIOB
#define KEY3_INT_EXTI_PINSOURCE           EXTI_PinSource2
#define KEY3_INT_EXTI_LINE                EXTI_Line2
#define KEY3_INT_EXTI_IRQ                 EXTI2_IRQn
#define KEY3_IRQHandler                   EXTI2_IRQHandler

void EXTI_Key_Config(void);


#endif

it.c

/**
  ******************************************************************************
  * @file    Project/STM32F4xx_StdPeriph_Templates/stm32f4xx_it.c 
  * @author  MCD Application Team
  * @version V1.4.0
  * @date    04-August-2014
  * @brief   Main Interrupt Service Routines.
  *          This file provides template for all exceptions handler and 
  *          peripherals interrupt service routine.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_it.h"
#include "main.h"

/** @addtogroup Template_Project
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/******************************************************************************/
/*            Cortex-M4 Processor Exceptions Handlers                         */
/******************************************************************************/

/**
  * @brief  This function handles NMI exception.
  * @param  None
  * @retval None
  */
void NMI_Handler(void)
{
}

/**
  * @brief  This function handles Hard Fault exception.
  * @param  None
  * @retval None
  */
void HardFault_Handler(void)
{
  /* Go to infinite loop when Hard Fault exception occurs */
  while (1)
  {
  }
}

/**
  * @brief  This function handles Memory Manage exception.
  * @param  None
  * @retval None
  */
void MemManage_Handler(void)
{
  /* Go to infinite loop when Memory Manage exception occurs */
  while (1)
  {
  }
}

/**
  * @brief  This function handles Bus Fault exception.
  * @param  None
  * @retval None
  */
void BusFault_Handler(void)
{
  /* Go to infinite loop when Bus Fault exception occurs */
  while (1)
  {
  }
}

/**
  * @brief  This function handles Usage Fault exception.
  * @param  None
  * @retval None
  */
void UsageFault_Handler(void)
{
  /* Go to infinite loop when Usage Fault exception occurs */
  while (1)
  {
  }
}

/**
  * @brief  This function handles SVCall exception.
  * @param  None
  * @retval None
  */
void SVC_Handler(void)
{
}

/**
  * @brief  This function handles Debug Monitor exception.
  * @param  None
  * @retval None
  */
void DebugMon_Handler(void)
{
}

/**
  * @brief  This function handles PendSVC exception.
  * @param  None
  * @retval None
  */
void PendSV_Handler(void)
{
}

/**
  * @brief  This function handles SysTick Handler.
  * @param  None
  * @retval None
  */
void SysTick_Handler(void)
{
  //TimingDelay_Decrement();
}

void KEY0_IRQHandler(void)
{
	char buf[20];
  //确保是否产生了EXTI Line中断
	if(EXTI_GetITStatus(KEY0_INT_EXTI_LINE) != RESET) 
	{
		memset(buf, 0, sizeof(buf));
		sprintf(buf, "key = %d", 0);
		Gui_DrawFont_GBK16(20,30,BLUE,GRAY0, buf);
		//清除中断标志位
		EXTI_ClearITPendingBit(KEY0_INT_EXTI_LINE);     
	}  
}

void KEY1_IRQHandler(void)
{
	char buf[20];
  //确保是否产生了EXTI Line中断
	if(EXTI_GetITStatus(KEY1_INT_EXTI_LINE) != RESET) 
	{
		memset(buf, 0, sizeof(buf));
		sprintf(buf, "key = %d", 1);
		Gui_DrawFont_GBK16(20,30,BLUE,GRAY0, buf);
		
		//清除中断标志位
		EXTI_ClearITPendingBit(KEY1_INT_EXTI_LINE);     
	}  
}


void KEY2_IRQHandler(void)
{
	char buf[20];
  //确保是否产生了EXTI Line中断
	if(EXTI_GetITStatus(KEY2_INT_EXTI_LINE) != RESET) 
	{
		memset(buf, 0, sizeof(buf));
		sprintf(buf, "key = %d", 2);
		Gui_DrawFont_GBK16(20,30,BLUE,GRAY0, buf);
		//清除中断标志位
		EXTI_ClearITPendingBit(KEY2_INT_EXTI_LINE);     
	}  
}


void KEY3_IRQHandler(void)
{
	char buf[20];
  //确保是否产生了EXTI Line中断
	if(EXTI_GetITStatus(KEY3_INT_EXTI_LINE) != RESET) 
	{
		memset(buf, 0, sizeof(buf));
		sprintf(buf, "key = %d", 3);
		Gui_DrawFont_GBK16(20,30,BLUE,GRAY0, buf);
		//清除中断标志位
		EXTI_ClearITPendingBit(KEY3_INT_EXTI_LINE);     
	}  
}


/******************************************************************************/
/*                 STM32F4xx Peripherals Interrupt Handlers                   */
/*  Add here the Interrupt Handler for the used peripheral(s) (PPP), for the  */
/*  available peripheral interrupt handler's name please refer to the startup */
/*  file (startup_stm32f4xx.s).                                               */
/******************************************************************************/

/**
  * @brief  This function handles PPP interrupt request.
  * @param  None
  * @retval None
  */
/*void PPP_IRQHandler(void)
{
}*/

/**
  * @}
  */ 


/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/