10月12日

3个按键中断

key_it.h

#ifndef __KEY_IT_H__
#define __KEY_IT_H__
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"
void key_it_config();
void led_init();
void buzzer_init();
void fan_init();
 
#endif

key_it.c

#include"key_it.h"
 
//中断初始化
void key_it_config()
{
    //RCC使能GPIOF时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //设置PF9 PF7 PF8GPIO输入
    //PF9
    GPIOF->MODER &= (~(0x3<<18));
    //PF8
    GPIOF->MODER &= (~(0x3<<16));
    //pf7
    GPIOF->MODER &= (~(0x3<<14));
    //设置PF9 PF7 PF8产生EXTI事件 EXTI_EXTICRx
    //pf7
    EXTI->EXTICR2 &=(~(0xFF)<<24);
    EXTI->EXTICR2 |= (0x5<<24);
 
    //pf9
    EXTI->EXTICR3 &=(~(0xFF)<<8);
    EXTI->EXTICR3 |= (0x5<<8);
 
    //pf8
    EXTI->EXTICR3 &=(~(0xFF)<<0);
    EXTI->EXTICR3 |= (0x5<<0);
 
 
    //设置事件触发方式为下降沿触发EXTI_FTSR1
    //pf7
    EXTI->FTSR1 |= (0x1<<7);
    //pf8
    EXTI->FTSR1 |= (0x1<<8);
    //pf9
    EXTI->FTSR1 |= (0x1<<9);
    //设置EXTI事件触发不屏蔽EXTI_IMR1
    //PF7
    EXTI->C1IMR1 |= (0x1<<7);
    //PF8
    EXTI->C1IMR1 |= (0x1<<8);
    //PF9
    EXTI->C1IMR1 |= (0x1<<9);
    //使能中断能转发到特定的CPU接口层GICD_ISENABLERx
    //PF7 97号中断
    GICD->ISENABLER[3] |= (0X1<<1); 
    //PF78 98号中断
    GICD->ISENABLER[3] |= (0X1<<2); 
    //PF9 99号中断
    GICD->ISENABLER[3] |= (0X1<<3); 
    //GICD_ISENABLERx设置中断优先级
    //PF7
    GICD->IPRIORITYR[24] &= (~(0X1F<<11)); 
    //PF8
    GICD->IPRIORITYR[24] &= (~(0X1F<<19)); 
    //PF9
    GICD->IPRIORITYR[24] &= (~(0X1F<<27)); 
    //设置当前中断被转发到哪一个CPU处理GICD_ITARGETSRx
    //pf7 97中断
    GICD->ITARGETSR[24]  &= (~(0X3<<8));
    GICD->ITARGETSR[24] |= (0X1<<8);
    //pf8 98中断
    GICD->ITARGETSR[24]  &= (~(0X3<<16));
    GICD->ITARGETSR[24] |= (0X1<<16);
    //pf9 99中断
    GICD->ITARGETSR[24]  &= (~(0X3<<24));
    GICD->ITARGETSR[24] |= (0X1<<24);
    //使能组0转发中断GICD_CTLR
    GICD->CTRL |= 0X1;
    //设置中断优先级掩码GICC_PMR
    GICC->PMR |= (0x1F<<3);
 
    //使能CPU可以处理组0转发的中断GICC_CTLR
    GICC->CTRL |= 0X1;
 
    
}
    
//led初始化
void led_init()
{
	//RCC使能
	RCC->MP_AHB4ENSETR |= (0x3<<4);
	//设置PE10  PB6为输出
	GPIOE->MODER &= (~(0x3)<<20);
	GPIOE->MODER |= (0x1<<20);
	//设置推挽输出
	GPIOE->OTYPER &= (~(0x1<<10));
	//设置三个管脚低速输出
	GPIOE->OSPEEDR &= (~0x3<<20);
	//设置三个管脚输出时无上拉下拉电阻
	GPIOE->PUPDR &= (~(0x3)<<20);
}
 
//buzzer初始化
void buzzer_init()
{
	//RCC使能
	RCC->MP_AHB4ENSETR |= (0x3<<1);
	//设置PE10  PB6为输出
	GPIOB->MODER &= (~(0x3)<<12);
	GPIOB->MODER |= (0x1<<12);
	//设置推挽输出
	GPIOB->OTYPER &= (~(0x1<<6));
	//设置三个管脚低速输出
	GPIOB->OSPEEDR &= (~0x3<<12);
	//设置三个管脚输出时无上拉下拉电阻
	GPIOB->PUPDR &= (~(0x3)<<12);
}
 
//fan初始化
void fan_init()
{
	//RCC使能
	RCC->MP_AHB4ENSETR |= (0x3<<4);
	//设置PE10  PB6为输出
	GPIOE->MODER &= (~(0x3)<<18);
	GPIOE->MODER |= (0x1<<18);
	//设置推挽输出
	GPIOE->OTYPER &= (~(0x1<<9));
	//设置三个管脚低速输出
	GPIOE->OSPEEDR &= (~0x3<<18);
	//设置三个管脚输出时无上拉下拉电阻
	GPIOE->PUPDR &= (~(0x3)<<18);
}

do_irq.c

#include "key_it.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
            //按键1中断处理
            printf("按键1  控制LED1\n");
            //LED1亮
            if (!(GPIOE->ODR & 0x1<<10))
            {
                GPIOE->ODR |= (0X1<<10);
            }else
            {
                GPIOE->ODR &= ~(0X1<<10);
            }
    //清除挂起中断标志位GICD_ICPENDRx
        GICD->ICPENDR[3] |= (0x1<<3);
    //清除中断触发标志位EXTI_FPR1
        EXTI->FPR1 |= (0x1<<9);
            break;
        case 97://key2
            //按键2中断处理
            printf("按键2 控制蜂鸣器\n");
            if (!(GPIOB->ODR & 0x1<<6))
            {
                GPIOB->ODR |= 0x1<<6;
            }else
            {
                GPIOB->ODR &= ~(0x1<<6);
            }
            
    //清除挂起中断标志位GICD_ICPENDRx
    GICD->ICPENDR[3] |= (0x1<<1);
    //清除中断触发标志位EXTI_FPR1
    EXTI->FPR1 |= (0x1<<7);
            break;
        case 98://key3
            //按键3中断处理
            printf("按键3 控制风扇\n");
            if (!(GPIOE->ODR & 0x1<<9))
            {
                GPIOE->ODR |= 0x1<<9;
            }else
            {
                GPIOE->ODR &= ~(0x1<<9);
            }
    //清除挂起中断标志位GICD_ICPENDRx
    GICD->ICPENDR[3] |= (0x1<<2);
    //清除中断触发标志位EXTI_FPR1
    EXTI->FPR1 |= (0x1<<8);
            break;
    }
    //清除处理完的中断号GICC_EOIR
    GICC->EOIR =irqno;
}

main.c

#include "key_it.h"
#include "led.h"
int main()
{
    //char c;
    //char *s;
    //uart4_init();//串口初始化
    //中断初始化
    key_it_config();
    led_init();
    buzzer_init();  
    fan_init();
    while(1)
    {
        //保证主程序不结束
    }
    return 0;
}