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作业要求：

代码运行效果图：

代码：

do_irq.c:

#include "key_it.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;//延时函数
void delay(int ms)
{int i,j;for(i=0;i<ms;i++){for(j=0;j<2000;j++);}
}void do_irq(void)
{//LED灯初始化all_led_init();int irqno = (GICC->IAR & 0x3ff);switch (irqno){case 99: // key1printf("KEY1_INT\n");//点亮两个灯led1_on();led3_on();delay(1000);//熄灭两个灯led1_off();led_off();delay(1000);// 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: // KEY2printf("KEY2_INT\n");//点亮三个灯led1_on();led2_on();led3_on();delay(1000);//熄灭三个灯led1_off();led2_off();led3_off();delay(1000);// 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: // key3printf("KEY3_INT\n");//延时点亮三个灯，一个灯亮的同时下个灯灭led1_on();delay(1000);led1_off();led2_on();delay(1000);led2_off();led3_on();delay(1000);led3_off();// 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.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GICCGICD->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管脚为输入GPIOF->MODER &= (~(0x3<<14));//设置PF7作为EXTI7事件的输入EXTI->EXTICR2 &= (~(0x1f<<24));EXTI->EXTICR2 |= (0x05<<24);//设置下降沿使能检测EXTI7事件EXTI->FTSR1 |= (0x1<<7);//设置EXTI7事件不屏蔽EXTI->C1IMR1 |= (0x1<<7);//GICD使能EXTI7（97号）中断GICD->ISENABLER[3] |= (0x1<<1);//GICD 设置97号中断的优先级GICD->IPRIORITYR[24] &= (~(0x1f<<11));//选择CPU0处理当前中断GICD->ITARGETSR[24] |= (0x1<<8);//全局使能组0中断被转发到GICCGICD->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 &= (~(0x1f));EXTI->EXTICR3 |= (0x05);//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GICCGICD->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); 
}

led.c

#include "led.h"
void all_led_init()
{RCC_GPIO |= (0X3<<4);//时钟使能GPIOE_MODER &=(~(0X3<<20));//设置PE10输出GPIOE_MODER |= (0X1<<20);//设置PE10为推挽输出GPIOE_OTYPER &=(~(0x1<<10));//PE10为低速输出GPIOE_OSPEEDR &= (~(0x3<<20));//设置无上拉下拉GPIOE_PUPDR &= (~(0x3<<20));//LED2GPIOF_MODER &=(~(0X3<<20));//设置Pf10输出GPIOF_MODER |= (0X1<<20);//设置Pf10为推挽输出GPIOF_OTYPER &=(~(0x1<<10));//Pf10为低速输出GPIOF_OSPEEDR &= (~(0x3<<20));//设置无上拉下拉GPIOF_PUPDR &= (~(0x3<<20));//LED3GPIOE_MODER &=(~(0X3<<16));//设置PE8输出GPIOE_MODER |= (0X1<<16);//设置PE8为推挽输出GPIOE_OTYPER &=(~(0x1<<8));//PE8为低速输出GPIOE_OSPEEDR &= (~(0x3<16));//设置无上拉下拉GPIOE_PUPDR &= (~(0x3<<16));
}
void led1_on()
{GPIOE_ODR |= (0x1<<10);
}void led1_off()
{GPIOE_ODR &= (~(0x1<<10));
}
void led2_on()
{GPIOF_ODR |= (0x1<<10);
}void led2_off()
{GPIOF_ODR &= (~(0x1<<10));
}
void led3_on()
{GPIOE_ODR |= (0x1<<8);
}void led3_off()
{GPIOE_ODR &= (~(0x1<<8));
}

main.c

#include "key_it.h"int main()
{key1_it_config();key2_it_config();key3_it_config();while (1){printf("do main...\n");delay(1000);}
}

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"
#include "led.h"
void key1_it_config();
void key2_it_config();
void key3_it_config();
void delay(int ms);
#endif

led.h

#ifndef __LED_H__
#define __LED_H__#define RCC_GPIO (*(unsigned int *)0x50000a28)
#define GPIOE_MODER (*(unsigned int *)0x50006000)
#define GPIOF_MODER (*(unsigned int *)0x50007000)
#define GPIOE_OTYPER (*(unsigned int *)0x50006004)
#define GPIOF_OTYPER (*(unsigned int *)0x50007004)
#define GPIOE_OSPEEDR (*(unsigned int *)0x50006008)
#define GPIOF_OSPEEDR (*(unsigned int *)0x50007008)
#define GPIOE_PUPDR (*(unsigned int *)0x5000600C)
#define GPIOF_PUPDR (*(unsigned int *)0x5000700c)
#define GPIOE_ODR (*(unsigned int *)0x50006014)
#define GPIOF_ODR (*(unsigned int *)0x50007014)void all_led_init();
void led1_on();
void led1_off();
void led2_on();
void led2_off();
void led3_on();
void led3_off();#endif

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