按键中断实验

key.h

#include "key.h"

extern void printf(const char *fmt, ...);

unsigned int i = 0;

void do_irq(void)

{

    int irqno;//保存中断号

    irqno=GICC->IAR & 0X3FF;

    switch(irqno)

    {

        case 99://key1

           if(GPIOE->ODR & (0x1<<10) != 0)

               GPIOE->ODR &= (~(0x1<<10));

            else

                GPIOE->ODR |=(0x1<<10);

            GICD->ICPENDR[3] |= (0x1<<3);

            EXTI->FPR1 |= (0x1<<9);

            break;

        case 97://key2

            GPIOB->ODR |= (0x1<<6);

            GICD->ICPENDR[3] |= (0x1<<1);

            EXTI->FPR1 |= (0x1<<7);

            break;

        case 98://key3

            GPIOE->ODR |= (0x1<<9);

            GICD->ICPENDR[3] |= (0x1<<2);

            EXTI->FPR1 |= (0x1<<8);

    }

    //清除处理完的中断号GICC_EOIR

    GICC->EOIR =irqno;

}

key.h

#ifndef __KEY_H__

#define __KEY_H__

#include "stm32mp1xx_rcc.h"

#include "stm32mp1xx_gpio.h"

#include "stm32mp1xx_exti.h"

#include "stm32mp1xx_gic.h"

void mykey();

void key3_init();

void key12_init();

#endif

key.c

#include "key.h"

void mykey()

{

    RCC->MP_AHB4ENSETR |= (0X3<<4);

    RCC->MP_AHB4ENSETR |= (0x1<<1);

    //led1灯初始

    GPIOE->MODER &= (~(0X3<<20));

    GPIOE->MODER |= (0x1<<20);

    GPIOE->OTYPER &= (~(0X1<<10));

    GPIOE->OSPEEDR &= (~(0X3<<20));

    GPIOE->PUPDR &= (~(0X3<<20));

    GPIOE->ODR |=(0x1<<10);

    //蜂鸣器

    GPIOB->MODER &= (~(0x1<<12));

    GPIOB->MODER |= (0x1<<12);

    GPIOB->OTYPER &= (~(0x1<<6));

    GPIOB->OSPEEDR |= (~(0x3<<12));

    GPIOB->PUPDR &= (~(0x3<<12));

    GPIOB->ODR |= (~(0x1<<6));

    //风扇

    GPIOE->MODER &= (~(0x1<<18));

    GPIOE->MODER |= (0x1<<18);

    GPIOE->OTYPER &= (~(0x1<<9));

    GPIOE->OSPEEDR |= (~(0x3<<18));

    GPIOE->PUPDR &= (~(0x3<<18));

    GPIOE->ODR &= (~(0x1<<9));

}

void key3_init()

{

    //RCC使能GPIOF时钟

    RCC->MP_AHB4ENSETR |= (0x1<<5);

    GPIOF->MODER &= (~(0x3<<16));

    EXTI->EXTICR3 &=(~(0xFF<<0));

    EXTI->EXTICR3 |= (0x5<<0);

    EXTI->FTSR1 |= (0x1<<8);

    EXTI->C1IMR1 |= (0x1<<8);

    GICD->ISENABLER[3] |= (0X1<<2);

    GICD->IPRIORITYR[24] &= (~(0X1F<<19));

    GICD->ITARGETSR[24]  &= (~(0X3<<16));

    GICD->ITARGETSR[24] |= (0X1<<16);

}

void key12_init()

{

    RCC->MP_AHB4ENSETR |= (0x1<<5);

    GPIOF->MODER &= (~(0x3<<18));

    GPIOF->MODER &= (~(0x3<<14));

    EXTI->EXTICR2 &=(~(0xFF<<24));

    EXTI->EXTICR2 |= (0x5<<24);

    EXTI->EXTICR3 &=(~(0xFF<<8));

    EXTI->EXTICR3 |= (0x5<<8);

    EXTI->FTSR1 |= (0x1<<7);

    EXTI->FTSR1 |= (0x1<<9);

    EXTI->C1IMR1 |= (0x1<<7);

    EXTI->C1IMR1 |= (0x1<<9);

    GICD->ISENABLER[3] |= (0X1<<1);

    GICD->ISENABLER[3] |= (0X1<<3);

    GICD->IPRIORITYR[24] &= (~(0X1F<<11));

    GICD->IPRIORITYR[24] &= (~(0X1F<<27));

    GICD->ITARGETSR[24]  &= (~(0X3<<8));

    GICD->ITARGETSR[24] |= (0X1<<8);

    GICD->ITARGETSR[24]  &= (~(0X3<<24));

    GICD->ITARGETSR[24] |= (0X1<<24);

    GICD->CTRL |= 0X1;

    GICC->PMR |= (0x1F<<3);

    GICC->CTRL |= 0X1;    

}

main.c

#include "key.h"

int main()

{

    mykey();

    key12_init();

    key3_init();

    for(;;);

    return 0;

}