12.26

key_it.c

#include"key_it.h"
void led_init()
{// 设置GPIOE/GPIOF时钟使能RCC->MP_AHB4ENSETR |= (0x3 << 4);// 设置PE10/PE8/PF10为输出模式GPIOE->MODER &= (~(0x3 << 20));GPIOE->MODER |= (0x1 << 20);GPIOE->MODER &= (~(0x3 << 16));GPIOE->MODER |= (0x1 << 16);GPIOF->MODER &= (~(0x3 << 20));GPIOF->MODER |= (0x1 << 20);// 设置PE10/PE8/PF10为推挽输出GPIOE->OTYPER &= (~(0x1 << 10));GPIOE->OTYPER &= (~(0X1 << 8));GPIOF->OTYPER &= (~(0x1 << 10));// 设置PE10/PE8/PF10输出速度为低速GPIOE->OSPEEDR &= (~(0x3 << 20));GPIOE->OSPEEDR &= (~(0X3 << 16));GPIOF->OSPEEDR &= (~(0x3 << 20));// 设置PE10/PE8/PF10无上拉下拉GPIOE->PUPDR &= (~(0x3 << 20));GPIOE->PUPDR &= (~(0X3 << 16));GPIOF->PUPDR &= (~(0X3 << 20));
}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()
{//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()
{//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); 
}

do_irq.c

#include "key_it.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{int irqno = (GICC->IAR & 0x3ff);switch (irqno){case 99: // key1printf("KEY1_INT\n");GPIOE->ODR |= (0x1<<10);// 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);delay(2000);GPIOE->ODR &= (~(0x1<<10));break;case 97: // KEY2printf("KEY2_INT\n");GPIOF->ODR |= (0x1<<10);// 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);delay(2000);GPIOF->ODR &= (~(0x1<<10));break;case 98: // key3printf("KEY3_INT\n");GPIOE->ODR |= (0x1<<8);// 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);delay(2000);GPIOE->ODR &= (~(0x1<<8));break;}// 清除中断号GICC->EOIR = irqno;}

main.c

#include "key_it.h"void delay(int ms){int i,j;for(i=0;i<ms;i++){for(j=0;j<2000;j++);}}int main(){led_init();key1_it_config();key2_it_config();key3_it_config();while (1){printf("do main...\n");delay(1000);}return 0;}