一、练习
do_irq.c
#include "mykey.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void)
{
unsigned int irqno=(GICC->IAR&0X3FF);
static int key1_flag=0;
static int key2_flag=0;
static int key3_flag=0;
switch (irqno)
{
case 99:
{
//中断处理逻辑
if(key1_flag==0)
{
GPIOE->ODR |= (0x1<<10);
key1_flag=1;
}
else if(key1_flag==1)
{
GPIOE->ODR &=(~(0x1<<10));
key1_flag=0;
}
//清除GICD的中断标志
GICD->ICPENDR[3] |=(0X1<<3);
//清除EXTI的中断触发标志
EXTI->FPR1 |=(0X1<<9);
}
break;
case 98:
{
//中断处理逻辑
//中断处理逻辑
if(key2_flag==0)
{
GPIOF->ODR |= (0x1<<10);
key2_flag=1;
}
else if(key2_flag==1)
{
GPIOF->ODR &=(~(0x1<<10));
key2_flag=0;
}
//清除GICD的中断标志
GICD->ICPENDR[3] |=(0X1<<2);
//清除EXTI的中断触发标志
EXTI->FPR1 |=(0X1<<8);
}
break;
case 97:
{
//中断处理逻辑
//中断处理逻辑
if(key3_flag==0)
{
GPIOE->ODR |= (0x1<<8);
key3_flag=1;
}
else if(key3_flag==1)
{
GPIOE->ODR &=(~(0x1<<8));
key3_flag=0;
}
//清除GICD的中断标志
GICD->ICPENDR[3] |=(0X1<<1);
//清除EXTI的中断触发标志
EXTI->FPR1 |=(0X1<<7);
}
break;
default:
break;
}
GICC->EOIR=irqno;
}
my_key.h
#ifndef __MYKEY_H__
#define __MYKEY_H__
#include "stm32mp1XX_gpio.h"
#include "stm32mp1XX_gic.h"
#include "stm32mp1XX_exti.h"
#include "stm32mp1XX_rcc.h"
void key1_int_config();
void key2_int_config();
void key3_int_config();
void led_init();
#endif
mykey.c
#include "mykey.h"
void key1_int_config()
{
//使能GPIOF外设时钟
RCC->MP_AHB4ENSETR |= (0X1<<5);
//设置PF9为输入
GPIOF->MODER &=(~(0X3<<18));
// 设置PF9产生EXTI9事件
EXTI->EXTICR3 &=(~(0xff<<8));
EXTI->EXTICR3 |=(0x05<<8);
//设置EXTI9为下降沿检测
EXTI->FTSR1 |=(0x1<<9);
//取消EXTI9的屏蔽
EXTI->C1IMR1 |=(0x1<<9);
//全局使能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);
//允许组0中断被转发到GICC层
GICD->CTRL |=0x1;
//设置中断优先级掩码
GICC->PMR |=(0x1f<<3);
//允许组0中断被转发给处理器
GICC->CTRL |=0x1;
}
void key2_int_config()
{
//使能GPIOF外设时钟
RCC->MP_AHB4ENSETR |= (0X1<<5);
//设置PF8为输入
GPIOF->MODER &=(~(0X3<<16));
// 设置PF8产生EXTI8事件
EXTI->EXTICR3 &=(~(0xff<<0));
EXTI->EXTICR3 |=(0x05<<0);
//设置EXTI8为下降沿检测
EXTI->FTSR1 |=(0x1<<8);
//取消EXTI8的屏蔽
EXTI->C1IMR1 |=(0x1<<8);
//全局使能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);
//允许组0中断被转发到GICC层
GICD->CTRL |=0x1;
//设置中断优先级掩码
GICC->PMR |=(0x1f<<3);
//允许组0中断被转发给处理器
GICC->CTRL |=0x1;
}
void key3_int_config()
{
//使能GPIOF外设时钟
RCC->MP_AHB4ENSETR |= (0X1<<5);
//设置PF7为输入
GPIOF->MODER &=(~(0X3<<14));
// 设置PF7产生EXTI7事件
EXTI->EXTICR2 &=(~(0xff<<24));
EXTI->EXTICR2 |=(0x05<<24);
//设置EXTI7为下降沿检测
EXTI->FTSR1 |=(0x1<<7);
//取消EXTI7的屏蔽
EXTI->C1IMR1 |=(0x1<<7);
//全局使能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);
//允许组0中断被转发到GICC层
GICD->CTRL |=0x1;
//设置中断优先级掩码
GICC->PMR |=(0x1f<<3);
//允许组0中断被转发给处理器
GICC->CTRL |=0x1;
}
main.c
#include "mykey.h"
int main()
{
key1_int_config();
key2_int_config();
key3_int_config();
led_init();
while (1)
{
}
return 0;
}