arm day7

开关中断控制

main.c

#include "key_it.h"
#include "uart.h"
void delay(int ms)
{
  int i,j;
  for(i=0;i<ms;i++)
  {
    for(j=0;j<2000;j++);
  }
}

int main()
{
  key2_it_config();

  key1_it_config();

  key3_it_config();
  all_led_init();
  char buf[128];
   gets(buf); 
    while (1)
    {
        puts(buf);
        delay(1000);
    }
}

// 最终现象：键盘输入a,串口工具显示b

 key_it.c

#include "key_it.h"
void key1_it_config()
{
    //使能GPIOF时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //设置PF9管脚为输入
    GPIOF->MODER &= (~(0x3<<18));
    //设置PF9作为EXTI9事件的输入
    EXTI->EXTICR3 &= (~(0x1f<<8));
    EXTI->EXTICR3 |= (0x05<<8);
    //设置下降沿使能检测EXTI9事件
    EXTI->FTSR1 |= (0x1<<9);
    //设置EXTI9事件不屏蔽
    EXTI->C1IMR1 |= (0x1<<9);
    //GICD使能EXTI9（99号）中断
    GICD->ISENABLER[3] |= (0x1<<3);
    //GICD 设置99号中断的优先级
    GICD->IPRIORITYR[24] &= (~(0x1f<<27));
    //选择CPU0处理当前中断
    GICD->ITARGETSR[24] |= (0x1<<24);
    //全局使能组0中断被转发到GICC
    GICD->CTRL |= (0X1);
    //设置中断的优先级掩码
    GICC->PMR |= (0x1f<<3);
    //允许组0中断被CPU处理
    GICC->CTRL |= (0x1);
}
void key3_it_config()
{
     //使能GPIOF时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //设置PF8管脚为输入
    GPIOF->MODER &= (~(0x3<<16));
    //设置PF8作为EXTI8事件的输入
    EXTI->EXTICR3 &= (~(0xff<<0));
    EXTI->EXTICR3 |= (0x05<<0);
    //设置下降沿使能检测EXTI8事件
    EXTI->FTSR1 |= (0x1<<8);
    //设置EXTI8事件不屏蔽
    EXTI->C1IMR1 |= (0x1<<8);
    //-------------------------------------------------
    //GICD使能EXTI8（98号）中断
    GICD->ISENABLER[3] |= (0x1<<2);
    //GICD 设置98号中断的优先级
    GICD->IPRIORITYR[24] &= (~(0x1f<<19));
    //选择CPU0处理当前中断
    GICD->ITARGETSR[24] |= (0x1<<16);
    //全局使能组0中断被转发到GICC
    GICD->CTRL |= (0X1);
    //设置中断的优先级掩码
    GICC->PMR |= (0x1f<<3);
    //允许组0中断被CPU处理
    GICC->CTRL |= (0x1);
}
void key2_it_config()
{
    //使能GPIOF时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
   //设置PF7输入模式
GPIOF->MODER &=(~(0x3<<14));
 
//设置PF7作为EXTI7事件输入
EXTI->EXTICR2 &=(~(0xff<<24));
EXTI->EXTICR2 |=(0x5<<24);
//设置下降沿检测
EXTI->FTSR1 |=(0x1<<7);
//设置EXTI7事件不屏蔽
EXTI->C1IMR1 |=(0x1<<7);
 
//使能GICD中断
GICD->ISENABLER[3]  |=(0x1<<1);
//设置GICD中断优先级
GICD->IPRIORITYR[24]  &=(~(0x1f<<11));
//设置cpu0处理当前中断
GICD->ITARGETSR[24]  |=(0x1<<8);
//全局使能使组0中断可以被转发到GICC
GICD->CTRL  |=(0x1);
 
//设置优先级掩码
GICC->PMR  |=(0x1f<<3);
//设置允许组0中断被cpu处理
GICC->CTRL |=(0x1);
}

do_it.c

#include "key_it.h"
#include "uart.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void)
{
    int irqno = (GICC->IAR & 0x3ff);
    switch (irqno)
    {
    case 99: // key1
    
    puts("KEY1_INT\n");
        // 清除GICD的中断排队标志
        GICD->ICPENDR[3] |= (0x1<<3);
        // 清除exti的事件触发标志
        EXTI->FPR1 |= (0x1<<9);
        break;
    case 97: // KEY2
    
        puts("KEY2_INT\n");
        //清除GICD的中断排队标志
                    GICD->ICPENDR[3] |=(0x1<<1);
                    //清除EXTI的事件触发标志
                    EXTI->FPR1 |=(0x1<<7);

        break;
    case 98: // key3
   
        led3_on();
        // 清除GICD的中断排队标志
GICD->ICPENDR[3] |=(0x1<<2);
                    //清除EXTI的事件触发标志
                    EXTI->FPR1 |=(0x1<<8);
        break;
    }
    // 清除中断号
    GICC->EOIR = irqno;
}

key_it.h 

#ifndef __KEY_IT_H__
#define __KEY_IT_H__
#include"stm32mp1xx_gpio.h"
#include"stm32mp1xx_gic.h"
#include"stm32mp1xx_exti.h"
#include"stm32mp1xx_rcc.h"
void key1_it_config();
void key2_it_config();
void key3_it_config();
#endif