本次实验用到蜂鸣器,按键,led模块,附上各模块的初始化函数
//led初始化
#include "led.h"
void LED_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOE, ENABLE);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);
GPIO_SetBits(GPIOB,GPIO_Pin_5);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5;
GPIO_Init(GPIOE,&GPIO_InitStructure);
GPIO_SetBits(GPIOE,GPIO_Pin_5);
}
//按键初始化
#include "key.h"
#include "stm32f10x.h"
#include "sys.h"
#include "delay.h"
void KEY_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOE, ENABLE);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4; //按键
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;
GPIO_Init(GPIOE,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPD;
GPIO_Init(GPIOA,&GPIO_InitStructure);
}
u8 KEY_Scan(u8 mode)
{
static u8 key_up=1;
if(mode)key_up=1;
if(key_up&&(KEY0==0||KEY1==0||KEY2==0||WK_UP==1))
{
delay_ms(10);
key_up=0;
if(KEY0==0)return KEY0_PRES;
else if(KEY1==0)return KEY1_PRES;
else if(KEY2==0)return KEY2_PRES;
else if(WK_UP==1)return WKUP_PRES;
}else if(KEY0==1&&KEY1==1&&KEY2==1&&WK_UP==0)key_up=1;
return 0;
}
//蜂鸣器初始化
#include "beep.h"
void BEEP_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);
GPIO_ResetBits(GPIOB,GPIO_Pin_8);
}
本实验的重点是外部中断的配置,而其一般的一般配置步骤为:
1.初始化IO 为输入; GPIO_Init();
2.开启IO口复用时钟;RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
3.设置IO口与中短线的映射关系;void GPIO_EXTILineConfig();
4.初始化线上中断,设置触发条件等;EXTI_Init();
5.配置中断分组(NVIC),并使能中断;NVIC_Init();
6.编写中断服务函数;EXTIx_IRQHandle();
7.清除中断标志位;EXTI_ClearITPendingBit();
#include "led.h"
#include "key.h"
#include "beep.h"
#include "delay.h"
#include "usart.h"
#include "exti.h"
void EXTIX_Init(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
KEY_Init();
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource2);
//GPIOE.2
EXTI_InitStructure.EXTI_Line=EXTI_Line2;
EXTI_InitStructure.EXTI_LineCmd =ENABLE;
EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;
EXTI_Init(&EXTI_InitStructure);
//GPIOE.3
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource3);
EXTI_InitStructure.EXTI_Line=EXTI_Line3;
EXTI_Init(&EXTI_InitStructure);
//GPIOE.4
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource4);
EXTI_InitStructure.EXTI_Line=EXTI_Line4;
EXTI_Init(&EXTI_InitStructure);
//GPIOA.0
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource0);
EXTI_InitStructure.EXTI_Line=EXTI_Line0;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel=EXTI0_IRQn;//WK_UP
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=3;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel=EXTI2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE; //KEY2
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=2;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel=EXTI3_IRQn; //KEY1
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel=EXTI4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE; //KEY0
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
NVIC_Init(&NVIC_InitStructure);
}
//WK_UP中断服务函数
void EXTI0_IRQHandler(void)
{
delay_ms(10); //按键去抖
if(WK_UP ==1)
{
BEEP=!BEEP; //蜂鸣器状态的翻转转
}
EXTI_ClearITPendingBit(EXTI_Line0); //清除中断标志位
}
//KEY2中断服务函数
void EXTI2_IRQHandler(void)
{
delay_ms(10);
if(KEY2 ==0)
{
LED0=!LED0; //LED0状态翻转
}
EXTI_ClearITPendingBit(EXTI_Line2);
}
//KEY1中断服务函数
void EXTI3_IRQHandler(void)
{
delay_ms(10);
if(KEY1 ==0)
{
LED1=!LED1;
}
EXTI_ClearITPendingBit(EXTI_Line3);
}
//KEY0中断服务函数
void EXTI4_IRQHandler(void)
{
delay_ms(10);
if(KEY0==0)
{
LED0=!LED0;
LED1=!LED1;
}
EXTI_ClearITPendingBit(EXTI_Line4);
}
主函数代码:
#include "led.h"
#include "delay.h"
#include "key.h"
#include "sys.h"
#include "usart.h"
#include "exti.h"
#include "beep.h"
int main()
{
delay_init();
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置中断优先级分组为2
LED_Init();
BEEP_Init();
KEY_Init();
EXTIX_Init();
LED0=0;
while(1)
{
printf("OK\r\n");
delay_ms(1000);
}
}