do_irq_c
#include"key_it.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void)
{//先获取中断号unsigned int irqno=(GICC->IAR &0x3ff);switch(irqno){case 99://按键1中断//进行中断处理printf("do_key1_int\n");//清除GICD中的中断排队标志GICD->ICPENDR[3] |= (0x1<<3);//清除EXTI中的事件挂起标志EXTI->FPR1 |= (0x1<<9);break;case 98://按键2中断//进行中断处理printf("do_key2_int\n");//清除GICD中的中断排队标志GICD->ICPENDR[3] |= (0x1<<2);//清除EXTI中的事件挂起标志EXTI->FPR1 |= (0x1<<8);break;case 97://按键3中断//进行中断处理printf("do_key3_int\n");//清除GICD中的中断排队标志GICD->ICPENDR[3] |= (0x1);//清除EXTI中的事件挂起标志EXTI->FPR1 |= (0x1<<7);break;}//清除IAR保存的中断号GICC->EOIR = irqno;
}key_it.c
#include"key_it.h"
#include"gpio.h"//按键1中的中断配置
void key1_config()
{//使能GPIOF外设时钟RCC->MP_AHB4ENSETR |= (0x1<<5);//将PF9设置为输入GPIOF->MODER &= (~(0X3<<18));//设置PF9生成EXTI9事件EXTI->EXTICR3 &= (~(0xff<<8));EXTI->EXTICR3 |= (0X05<<8);//设置下降沿检测EXTI9事件EXTI->FTSR1 |= (0X1<<9);//取消EXTI9的屏蔽EXTI->C1IMR1 |= (0X1<<9);//使能99号中断GICD->ISENABLER[3] |= (0x1<<3);//设置使能99号中断的优先级GICD->IPRIORITYR[24] &= (~(0X1f<<27));//设置99号中断目标处理器GICD->ITARGETSR[24] |= (0X1<<24);//全局使能组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);//全局使能组0中断转发给处理器GICC->CTRL |= (0X1);
}
//按键2中的中断配置
void key2_config()
{//使能GPIOF外设时钟RCC->MP_AHB4ENSETR |= (0x1<<5);//将PF8设置为输入GPIOF->MODER &= (~(0X3<<16));//设置PF8生成EXTI8事件EXTI->EXTICR3 &= (~(0xff));EXTI->EXTICR3 |= (0X05);//设置下降沿检测EXTI8事件EXTI->FTSR1 |= (0X1<<8);//取消EXTI8的屏蔽EXTI->C1IMR1 |= (0X1<<8);//使能98号中断GICD->ISENABLER[3] |= (0x1<<2);//设置使能98号中断的优先级GICD->IPRIORITYR[24] &= (~(0X1f<<19));//设置98号中断目标处理器GICD->ITARGETSR[24] |= (0X1<<16);//全局使能组0中断被转发到GICC层GICD->CTRL |= (0X1<<0);//设置中断优先级掩码GICC->PMR &= (~(0X1f<<3));GICC->PMR |= (0X6<<3);//全局使能组0中断转发给处理器GICC->CTRL |= (0X1);
}
//按键3中的中断配置
void key3_config()
{//使能GPIOF外设时钟RCC->MP_AHB4ENSETR |= (0x1<<5);//将PF7设置为输入GPIOF->MODER &= (~(0X3<<14));//设置PF7生成EXTI7事件EXTI->EXTICR2 &= (~(0xff<<24));EXTI->EXTICR2 |= (0X5<<24);//设置下降沿检测EXTI7事件EXTI->FTSR1 |= (0X1<<7);//取消EXTI7的屏蔽EXTI->C1IMR1 |= (0X1<<7);//使能97号中断GICD->ISENABLER[3] |= (0x1<<1);//设置使能97号中断的优先级GICD->IPRIORITYR[24] &= (~(0X1f<<11));//设置97号中断目标处理器GICD->ITARGETSR[24] |= (0X1<<8);//全局使能组0中断被转发到GICC层GICD->CTRL |= (0X1<<0);//设置中断优先级掩码GICC->PMR &= (~(0x1f<<3));GICC->PMR |= (0X5<<3);//全局使能组0中断转发给处理器GICC->CTRL |= (0X1<<0);
}key_it.h
#ifndef _KEY_IT_H_
#define _KEY_IT_H_#include "gpio.h"#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"void key1_config();
void key2_config();
void key3_config();
#endif
main.c
#include"key_it.h"
extern void printf(const char *fmt,...);
//手动封装一个延时函数
void delay_ms(int ms)
{int i,j;for(i=0;i<ms;i++){for(j=0;j<2000;j++){}}
}void LED_init()
{RCC_AHB4_ENSETR |= (0x3<<4);gpio_init_t init= {OUTPUT,PP,LOW,NO_PUPD};//LED初始化hal_gpio_init(GPIOE,&init,GPIO_PIN_10); //led1hal_gpio_init(GPIOF,&init,GPIO_PIN_10);//led2hal_gpio_init(GPIOE,&init,GPIO_PIN_8);//led3
}int main()
{LED_init();key1_config();key2_config();key3_config();while(1){printf("do_main\n");delay_ms(1000);}return 0 ;}