10月12日
3个按键中断
key_it.h
#ifndef __KEY_IT_H__
#define __KEY_IT_H__
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"
void key_it_config();
void led_init();
void buzzer_init();
void fan_init();#endifkey_it.c
#include"key_it.h"//中断初始化
void key_it_config()
{//RCC使能GPIOF时钟RCC->MP_AHB4ENSETR |= (0x1<<5);//设置PF9 PF7 PF8GPIO输入//PF9GPIOF->MODER &= (~(0x3<<18));//PF8GPIOF->MODER &= (~(0x3<<16));//pf7GPIOF->MODER &= (~(0x3<<14));//设置PF9 PF7 PF8产生EXTI事件 EXTI_EXTICRx//pf7EXTI->EXTICR2 &=(~(0xFF)<<24);EXTI->EXTICR2 |= (0x5<<24);//pf9EXTI->EXTICR3 &=(~(0xFF)<<8);EXTI->EXTICR3 |= (0x5<<8);//pf8EXTI->EXTICR3 &=(~(0xFF)<<0);EXTI->EXTICR3 |= (0x5<<0);//设置事件触发方式为下降沿触发EXTI_FTSR1//pf7EXTI->FTSR1 |= (0x1<<7);//pf8EXTI->FTSR1 |= (0x1<<8);//pf9EXTI->FTSR1 |= (0x1<<9);//设置EXTI事件触发不屏蔽EXTI_IMR1//PF7EXTI->C1IMR1 |= (0x1<<7);//PF8EXTI->C1IMR1 |= (0x1<<8);//PF9EXTI->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//PF7GICD->IPRIORITYR[24] &= (~(0X1F<<11)); //PF8GICD->IPRIORITYR[24] &= (~(0X1F<<19)); //PF9GICD->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_CTLRGICD->CTRL |= 0X1;//设置中断优先级掩码GICC_PMRGICC->PMR |= (0x1F<<3);//使能CPU可以处理组0转发的中断GICC_CTLRGICC->CTRL |= 0X1;}//led初始化
void led_init()
{//RCC使能RCC->MP_AHB4ENSETR |= (0x3<<4);//设置PE10 PB6为输出GPIOE->MODER &= (~(0x3)<<20);GPIOE->MODER |= (0x1<<20);//设置推挽输出GPIOE->OTYPER &= (~(0x1<<10));//设置三个管脚低速输出GPIOE->OSPEEDR &= (~0x3<<20);//设置三个管脚输出时无上拉下拉电阻GPIOE->PUPDR &= (~(0x3)<<20);
}//buzzer初始化
void buzzer_init()
{//RCC使能RCC->MP_AHB4ENSETR |= (0x3<<1);//设置PE10 PB6为输出GPIOB->MODER &= (~(0x3)<<12);GPIOB->MODER |= (0x1<<12);//设置推挽输出GPIOB->OTYPER &= (~(0x1<<6));//设置三个管脚低速输出GPIOB->OSPEEDR &= (~0x3<<12);//设置三个管脚输出时无上拉下拉电阻GPIOB->PUPDR &= (~(0x3)<<12);
}//fan初始化
void fan_init()
{//RCC使能RCC->MP_AHB4ENSETR |= (0x3<<4);//设置PE10 PB6为输出GPIOE->MODER &= (~(0x3)<<18);GPIOE->MODER |= (0x1<<18);//设置推挽输出GPIOE->OTYPER &= (~(0x1<<9));//设置三个管脚低速输出GPIOE->OSPEEDR &= (~0x3<<18);//设置三个管脚输出时无上拉下拉电阻GPIOE->PUPDR &= (~(0x3)<<18);
}do_irq.c
#include "key_it.h"extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void)
{int irqno;//保存中断号irqno=GICC->IAR & 0X3FF;switch(irqno){case 99://key1//按键1中断处理printf("按键1 控制LED1\n");//LED1亮if (!(GPIOE->ODR & 0x1<<10)){GPIOE->ODR |= (0X1<<10);}else{GPIOE->ODR &= ~(0X1<<10);}//清除挂起中断标志位GICD_ICPENDRxGICD->ICPENDR[3] |= (0x1<<3);//清除中断触发标志位EXTI_FPR1EXTI->FPR1 |= (0x1<<9);break;case 97://key2//按键2中断处理printf("按键2 控制蜂鸣器\n");if (!(GPIOB->ODR & 0x1<<6)){GPIOB->ODR |= 0x1<<6;}else{GPIOB->ODR &= ~(0x1<<6);}//清除挂起中断标志位GICD_ICPENDRxGICD->ICPENDR[3] |= (0x1<<1);//清除中断触发标志位EXTI_FPR1EXTI->FPR1 |= (0x1<<7);break;case 98://key3//按键3中断处理printf("按键3 控制风扇\n");if (!(GPIOE->ODR & 0x1<<9)){GPIOE->ODR |= 0x1<<9;}else{GPIOE->ODR &= ~(0x1<<9);}//清除挂起中断标志位GICD_ICPENDRxGICD->ICPENDR[3] |= (0x1<<2);//清除中断触发标志位EXTI_FPR1EXTI->FPR1 |= (0x1<<8);break;}//清除处理完的中断号GICC_EOIRGICC->EOIR =irqno;
}
main.c
#include "key_it.h"
#include "led.h"
int main()
{//char c;//char *s;//uart4_init();//串口初始化//中断初始化key_it_config();led_init();buzzer_init(); fan_init();while(1){//保证主程序不结束}return 0;
}