ARM day7 - 技术栈

实现三个按键中断代码

按键1中断控制LED1

按键2中断控制LED2

按键3中断控制LED3

key_it.h:

cpp 复制代码

#ifndef __KEY_IT_H__
#define __KEY_IT_H__

#include"stm32mp1xx_gpio.h"
#include"stm32mp1xx_rcc.h"
#include"stm32mp1xx_exti.h"
#include"stm32mp1xx_gic.h"
void key1_config();
void key2_config();
void key3_config();
void do_irq(void);
#endif

led.h:

cpp 复制代码

#ifndef __LED_H__
#define __LED_H__
#include"stm32mp1xx_gpio.h"
#include"stm32mp1xx_rcc.h"
#include"stm32mp1xx_exti.h"
#include"stm32mp1xx_gic.h"
// typedef struct{
//     unsigned int MODER;
//     unsigned int OTYPER;
//     unsigned int OSPEEDR;
//     unsigned int PUPDR;
//     unsigned int IDR;
//     unsigned int ODR;
//     unsigned int BSRR;
// }gpio_t;

// #define  GPIOE ((gpio_t *)0x50006000)
// #define  GPIOF ((gpio_t *)0x50007000)

void led1_init();
void led2_init();
void led3_init();
void led1_ctl(int flag);
void led2_ctl(int flag);
void led3_ctl(int flag);
#endif

do_irq.c:

cpp 复制代码

#include"key_it.h"
#include"led.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{
       //先获取中断号
    unsigned int irqno=(GICC->IAR &0x3ff);
    switch(irqno)
    {
        case 99://按键1中断
            //进行中断处理
            printf("do_key1_int\n");
            if((GPIOE->ODR &=(0x1<<10)) == 0 )
            {
                led1_ctl(1);
            }else
            led1_ctl(0);
            //清除GICD中的中断排队标志
            GICD->ICPENDR[3] |= (0x1<<3);
            //清除EXTI中的事件挂起标志
            EXTI->FPR1 |= (0x1<<9);
            break;
        case 97://按键2中断
            //进行中断处理
            printf("do_key2_int\n");
            if((GPIOF->ODR &=(0x1<<10)) == 0 )
            {
                led2_ctl(1);
            }else
            led2_ctl(0);
            //清除GICD中的中断排队标志
            GICD->ICPENDR[3] |= (0x1<<1);
            //清除EXTI中的事件挂起标志
            EXTI->FPR1 |= (0x1<<7);
            
            break;
        case 98://按键3中断
            //进行中断处理
            printf("do_key3_int\n");
            if((GPIOE->ODR &=(0x1<<8)) == 0 )
            {
                led3_ctl(1);
            }else
            led3_ctl(0);
            //清除GICD中的中断排队标志
            GICD->ICPENDR[3] |= (0x1<<2);
            //清除EXTI中的事件挂起标志
            EXTI->FPR1 |= (0x1<<8);
            
            break;
    }
    //清除IAR保存的中断号
    GICC->EOIR = irqno;
}

key_it.c:

cpp 复制代码

#include"key_it.h"

//按键1中断的配置
void key1_config()
{
    //使能GPIOF外设时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //将PF9设置为输入
    GPIOF->MODER &= (~(0x3<<18));
    //设置PF9生成EXTI9事件
    EXTI->EXTICR3 &= (~(0xff<<8));
    EXTI->EXTICR3 |= (0x05<<8);
    //设置下降沿检测EXTI9事件
    EXTI->FTSR1 |= (0x1<<9);
    //取消EXTI9的事件屏蔽
    EXTI->C1IMR1 |= (0X1<<9);
    //使能99号中断
    GICD->ISENABLER[3] |= (0X1<<3);
    //设置99号中断的优先级
    GICD->IPRIORITYR[24] &= (~(0x1f<<27));
    //设置99号中断的目标处理器
    GICD->ITARGETSR[24] |= (0x1<<24);
    //全局使能组0中断被转发到GICC层
    GICD->CTRL |= 0X1;
    //设置中断的优先级掩码
    GICC->PMR |= (0x1f<<3);
    //全局使能组0中断被转发给处理器
    GICC->CTRL |= (0x1);
}
//按键2中断的配置
void key2_config()
{
    //使能GPIOF外设时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //将PF7设置为输入
    GPIOF->MODER &= (~(0x3<<14));
    //设置PF7生成EXTI7事件
    EXTI->EXTICR2 &= (~(0xff<<24));
    EXTI->EXTICR2 |= (0x05<<24);
    //设置下降沿检测EXTI7事件
    EXTI->FTSR1 |= (0x1<<7);
    //取消EXTI7的事件屏蔽
    EXTI->C1IMR1 |= (0X1<<7);
    //使能97号中断
    GICD->ISENABLER[3] |= (0X1<<1);
    //设置97号中断的优先级
    GICD->IPRIORITYR[24] &= (~(0x1f<<11));
    //设置97号中断的目标处理器
    GICD->ITARGETSR[24] |= (0x1<<8);
    //全局使能组0中断被转发到GICC层
    GICD->CTRL |= 0X1;
    //设置中断的优先级掩码
    GICC->PMR |= (0x1f<<3);
    //全局使能组0中断被转发给处理器
    GICC->CTRL |= (0x1);
}
//按键3中断的配置
void key3_config()
{
    //使能GPIOF外设时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //将PF8设置为输入
    GPIOF->MODER &= (~(0x3<<16));
    //设置PF8生成EXTI8事件
    EXTI->EXTICR3 &= (~0xff);
    EXTI->EXTICR3 |= (0x05);
    //设置下降沿检测EXTI8事件
    EXTI->FTSR1 |= (0x1<<8);
    //取消EXTI8的事件屏蔽
    EXTI->C1IMR1 |= (0X1<<8);
    //使能98号中断
    GICD->ISENABLER[3] |= (0X1<<2);
    //设置98号中断的优先级
    GICD->IPRIORITYR[24] &= (~(0x1f<<19));
    //设置98号中断的目标处理器
    GICD->ITARGETSR[24] |= (0x1<<16);
    //全局使能组0中断被转发到GICC层
    GICD->CTRL |= 0X1;
    //设置中断的优先级掩码
    GICC->PMR |= (0x1f<<3);
    //全局使能组0中断被转发给处理器
    GICC->CTRL |= (0x1);
}

led.c:

cpp 复制代码

#include "led.h"

void led1_init()
{
    // 设置PE10为输出模式
    GPIOE->MODER &= (~(0x3 << 20));
    GPIOE->MODER |= (0x1 << 20);
    // 设置PE10为推挽输出
    GPIOE->OTYPER &= (~(0x1 << 10));
    // 设置PE10为低速输出
    GPIOE->OSPEEDR &= (~(0x3 << 20));
    // 设置PE10无上拉下拉
    GPIOE->PUPDR &= (~(0x3 << 20));
}
void led2_init()
{
    // 设置Pf10为输出模式
    GPIOF->MODER &= (~(0x3 << 20));
    GPIOF->MODER |= (0x1 << 20);
    // 设置PF10为推挽输出
    GPIOF->OTYPER &= (~(0x1 << 10));
    // 设置PF10为低速输出
    GPIOF->OSPEEDR &= (~(0x3 << 20));
    // 设置PF10无上拉下拉
   GPIOF->PUPDR &= (~(0x3 << 20));
}
void led3_init()
{
    // 设置PE8为输出模式
    GPIOE->MODER &= (~(0x3 << 16));
    GPIOE->MODER |= (0x1 << 16);

    // 设置PE8为推挽输出
    GPIOE->OTYPER &= (~(0x1 << 8));

    // 设置PE8为低速输出
    GPIOE->OSPEEDR &= (~(0x3 << 16));

    // 设置PE8无上拉下拉
    GPIOE->PUPDR &= (~(0x3 << 16));
}
//LED1控制
void led1_ctl(int flag)
{
    if(flag==1)
    {
        GPIOE->ODR |= (0x1<<10);
    }
    else if(flag==0)
    {
        GPIOE->ODR &= (~(0x1<<10));
    }
}
//LED2控制
void led2_ctl(int flag)
{
    if(flag==1)
    {
        GPIOF->ODR |= (0x1<<10);
    }
    else if(flag==0)
    {
        GPIOF->ODR &= (~(0x1<<10));
    }
}
//LED3控制
void led3_ctl(int flag)
{
    if(flag==1)
    {
        GPIOE->ODR |= (0x1<<8);
    }
    else if(flag==0)
    {
        GPIOE->ODR &= (~(0x1<<8));
    }
}

main.c:

cpp 复制代码

#include"key_it.h"
#include"led.h"
extern void printf(const char *fmt, ...);
//手动封装一个延时函数
void delay_ms(int ms)
{
    int i,j;
    for(i=0;i<ms;i++)
    {
        for(j=0;j<2000;j++)
        {

        }
    }
}
int main()
{
    //使能GPIO的外设时钟
    *((unsigned int *)0X50000A28) |= (0X3<<4);
    led1_init();
    led2_init();
    led3_init();

    key1_config();
    key2_config();
    key3_config();
     while(1)
    {
        printf("do_main\n");
        delay_ms(1000);
    }
    return 0;
}