day51

main.c 

#include "uart.h"
int main(int argc, const char *argv[])
{
	key_it_config();
	key3_it_config();
	rcc_start();
	gpio_start();
	while(1)
	{	
	}
	return 0;
}
 

 uart.c

#include "uart.h"
void key3_it_config()
{
	RCC->MP_AHB4ENSETR |= (0x1<<5);
	GPIOF->MODER &=(~(0x3<<16));
	EXTI->EXTICR3 &=(~(0xFF<<0));
	EXTI->EXTICR3 |=(0x5<<0);
	EXTI->FTSR1 |=(0x1<<8);
	EXTI->C1IMR1 |=(0x1<<8);
	GICD->ISENABLER[3] |=(0x1<<2);
	GICD->IPRIORITYR[24] &= (~(0x1F<<19));
	GICD->ITARGETSR[24] &= (~(0x3<<16));
	GICD->ITARGETSR[24] |= (0x1<<16); 
}
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);
    //pf8
    // EXTI->EXTICR3 &=(~(0xFF<<0));
    // EXTI->EXTICR3 |= (0x5<<0);
    //pf9
    EXTI->EXTICR3 &=(~(0xFF<<8));
    EXTI->EXTICR3 |= (0x5<<8);
    //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;
}
//给RCC使能
void rcc_start()
{
	RCC->MP_AHB4LPENSETR |= (0x3<<4);
}
void gpio_start()
{
	//PE10 PE9 PE8设置为输出模式
	GPIOE->MODER &= (~(0x3f<<16));
	GPIOE->MODER |= (0x15<<16);
	//PF10设置为输出模式
	GPIOF->MODER &= (~(0x3<<20));
	GPIOF->MODER |= (0x1<<20);
	//PB6设置为输出模式
	GPIOB->MODER &= (~(0x3<<12));
	GPIOB->MODER |= (0x1<<12);
	//PE10 PE9 PE8设置为推挽输出
	GPIOE->OTYPER &= (~(0x7<<8));
	//PF10设置为推挽输出
	GPIOF->OTYPER &= (~(0x1<<10));
	//PB6设置为推挽输出
	GPIOB->OTYPER &= (~(0x1<<6));
	//PE10 PE9 PE8设置为低速输出
	GPIOE->OSPEEDR &= (~(0x3f<<16));
	//PF10设置为低速输出
	GPIOF->OSPEEDR &= (~(0x3<<20));
	//PB6设置为低速输出
	GPIOB->OSPEEDR &= (~(0x3<<12));
	//PE10 PE9 PE8设置为无上拉下拉电阻
	GPIOE->PUPDR &= (~(0x3f<<16));
	//PF10设置为无上拉下拉电阻
	GPIOF->PUPDR &= (~(0x3<<20));
	//PB6设置为无上拉下拉电阻
	GPIOB->PUPDR &= (~(0x3<<16));
}

do_irq.c 

#include "uart.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
int x=0,j=0,k=0;
void do_irq(void) 
{
	int irqno;
	irqno = GICC->IAR & 0x3FF;
	printf("%d\n",irqno);
	switch (irqno)
	{
	case 99://key1
		if(x==0)
		{
			//灯亮
			GPIOF->ODR |=(0x1<<10);
			x=1;
		}else
		{
			//灯灭
			GPIOF->ODR &=(~(0x1<<10));
			x=0;
		}
		GICD->ICPENDR[3] |=(0x1<<3);
		EXTI->FPR1 |=(0x1<<9);
		break;
	case 97://key2
			 if(j == 0)
            {
                //PB6
                GPIOB->ODR |= (0x1<<6);
                j=1;
            }
            //蜂鸣器停
            else
            {
                //PB6
                GPIOB->ODR &= ~(0x1<<6);
                j = 0;
            }
            //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
			if(k==0)
			{
				//PE9
				GPIOE->ODR |=(0x1<<9);
				k=1;
			}
			else
			{
				GPIOE->ODR &=(~(0x1<<9));
				k=0;
			}
            //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;
	}
	GICC->EOIR =irqno;
}