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作业：按键中断实现LED1、蜂鸣器、风扇
key_in.c:
#include "key_in.h"void gpio_init()
{//RCC使能//GPIOERCC->MP_AHB4ENSETR |= (0x1<<4);//GPIOBRCC->MP_AHB4ENSETR |= (0x1<<1);//PE10、PB6、PE9输出模式GPIOE->MODER &= ~(0x3<<20);GPIOE->MODER |= (0x1<<20);GPIOB->MODER &= ~(0x3<<12);GPIOB->MODER |= (0x1<<12);GPIOE->MODER &= ~(0x3<<18);GPIOE->MODER |= (0x1<<18);//推挽模式GPIOE->OTYPER &= ~(0x1<<10);GPIOB->OTYPER &= ~(0x1<<6);GPIOE->OTYPER &= ~(0x1<<9);//速度设置为低速GPIOE->OSPEEDR &= ~(0x3<<20);GPIOB->OSPEEDR &= ~(0x3<<12);GPIOE->OSPEEDR &= ~(0x3<<18);//设置为无上拉下拉电阻GPIOE->PUPDR &= ~(0x3<<20);GPIOB->PUPDR &= ~(0x3<<12);GPIOE->PUPDR &= ~(0x3<<18);}
void key_in_config()
{//RCC使能GPIOF时钟RCC->MP_AHB4ENSETR |= (0x1<<5);//设置PF9 PF7 PF8管脚为输入模式GPIOF->MODER &= ~(0x3f<<14);//设置PF9 PF7 PF8发生EXTI事件 EXTI->EXTICR3 &= ~(0xff<<8);EXTI->EXTICR3 |= (0x05<<8);EXTI->EXTICR2 &= ~(0xff<<24);EXTI->EXTICR2 |= (0x05<<24);EXTI->EXTICR3 &= ~(0xff);EXTI->EXTICR3 |= (0x05);//设置EXTI中断触发模式为下降沿模式EXTI->FTSR1 |= (0x7<<7);//设置EXTI事件触发为不屏蔽EXTI->C1IMR1 |= (0x7<<7);//使能组0GICD->CTRL |= 0x1;//中断使能，使其可以传到CPUGICD->ISENABLER[3] |= (0x1<<3);GICD->ISENABLER[3] |= (0x1<<1);GICD->ISENABLER[3] |= (0x1<<2);//设置中断优先级GICD->IPRIORITYR[24] &= ~(0x1f<<27);GICD->IPRIORITYR[24] &= ~(0x1f<<11);GICD->IPRIORITYR[24] &= ~(0x1f<<19);//选择CPU处理中断GICD->ITARGETSR[24] &= ~(0x3<<24);GICD->ITARGETSR[24] |= (0x1<<24);GICD->ITARGETSR[24] &= ~(0x3<<8);GICD->ITARGETSR[24] |= (0x1<<8);GICD->ITARGETSR[24] &= ~(0x3<<16);GICD->ITARGETSR[24] |= (0x1<<16);//使能CPU处理转发的中断GICC->CTRL |= 0x1;//设置中断掩码GICC->PMR &= ~(0x1f<<3);GICC->PMR |= (0x5<<3);}
do_irq.c:
#include "key_in.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;void do_irq(void)
{int irqno;static int i1=0,i2=0,i3=0;irqno = GICC->IAR & 0x3ff;switch(irqno){case 99:printf("KEY1 %d\n",irqno);i1++;//key1中断处理,LED1if(i1%2==1)GPIOE->ODR |= (0x1<<10);elseGPIOE->ODR &= ~(0x1<<10);//清除挂起中断标识位GICD->ICPENDR[3] |= (0x1<<3);//清除事情挂起标识位EXTI->FPR1 |= (0x1<<9);break;case 97:printf("KEY2 %d\n",irqno);i2++;//key2中断处理,蜂鸣器if(i2%2==1)GPIOB->ODR |= (0x1<<6);elseGPIOB->ODR &= ~(0x1<<6);//清除挂起中断标识位GICD->ICPENDR[3] |= (0x1<<1);//清除事情挂起标识位EXTI->FPR1 |= (0x1<<7);break;case 98:printf("KEY3 %d\n",irqno);i3++;//key3中断处理,风扇if(i3%2==1)GPIOE->ODR |= (0x1<<9);elseGPIOE->ODR &= ~(0x1<<9);//清除挂起中断标识位GICD->ICPENDR[3] |= (0x1<<2);//清除事情挂起标识位EXTI->FPR1 |= (0x1<<8);break;}//清除处理完的中断IAR到EOIRGICC->EOIR=irqno;
}
key_in.h:
#ifndef __KEY_IN_H__
#define __KEY_IN_H__
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"void gpio_init();
void key_in_config();
#endif
main.c:
#include "key_in.h"int main()
{gpio_init();key_in_config();while(1){}return 0;
}
现象:
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