设置按键中断，按键1按下，LED亮，再按一次，灭按键2按下，蜂鸣器响。再按一次，不响按键3按下，风扇转，再按一次，风扇停
src/key_it.c
#include"key_it.h"
//GPIO初始化
void all_led_init()
{
//RCC使能
RCC->MP_AHB4ENSETR |= (0X1<<4);
//设置PE10 PF10 PE8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电阻和下拉电阻
GPIOE->PUPDR &= (~(0X3<<20));
}
void all_spi_init()
{
//RCC使能
RCC->MP_AHB4ENSETR |= (0X3<<1);
//设置PE10 PF10 PE8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电阻和下拉电阻
GPIOB->PUPDR &= (~(0X3<<12));
}
void all_fan_init()
{
//RCC使能
RCC->MP_AHB4ENSETR |= (0X3<<4);
//设置PE10 PF10 PE8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电阻和下拉电阻
GPIOE->PUPDR &= (~(0X3<<18));
}
//按键2的配置
void key2_it_config()
{
//RCC使能GPIOF时钟
RCC->MP_AHB4ENSETR |= (0x1<<5);
//pf7
GPIOF->MODER &= (~(0x3<<14));
//pf7
EXTI->EXTICR2 &=(~(0xFF<<24));
EXTI->EXTICR2 |= (0x5<<24);
//pf7
EXTI->FTSR1 |= (0x1<<7);
//PF7
EXTI->C1IMR1 |= (0x1<<7);
//PF7 97号中断
GICD->ISENABLER[3] |= (0X1<<1);
//PF7
GICD->IPRIORITYR[24] &= (~(0X1F<<11));
//pf7 97中断
GICD->ITARGETSR[24] &= (~(0X3<<8));
GICD->ITARGETSR[24] |= (0X1<<8);
}
//按键1 按键3以及GICC层的配置
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));
//设置PF9 PF7 PF8产生EXTI事件 EXTI_EXTICRx
//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
//pf8
EXTI->FTSR1 |= (0x1<<8);
//pf9
EXTI->FTSR1 |= (0x1<<9);
//设置EXTI事件触发不屏蔽EXTI_IMR1
//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
//PF8 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
//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
//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;
}
src/do_irq.c
#include "key_it.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void)
{
static int flag=0;
static int flag1=0;
static int flag2=0;
int irqno;//保存中断号
irqno=GICC->IAR & 0X3FF;
switch(irqno)
{
case 99://key1
//按键1中断处理
//printf("KEY1 INT\n");
if(0==flag)
{
//LED1亮
GPIOE->ODR |= (0X1<<10);
flag=1;
}
else if(1==flag)
{
//LED1灭
GPIOE->ODR &= (~(0X1<<10));
flag=0;
}
//清除挂起中断标志位GICD_ICPENDRx
GICD->ICPENDR[3] |= (0x1<<3);
//清除中断触发标志位EXTI_FPR1
EXTI->FPR1 |= (0x1<<9);
break;
case 97://key2
//按键2中断处理
//printf("KEY2 INT\n");
if(0==flag1)
{
//蜂鸣器响
GPIOB->ODR |= (0X1<<6);
flag1=1;
}
else if(1==flag1)
{
//蜂鸣器不响
GPIOB->ODR &= (~(0X1<<6));
flag1=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
//按键3中断处理
// printf("KEY3 INT\n");
if(0==flag2)
{
//风扇转
GPIOE->ODR |= (0X1<<9);
flag2=1;
}
else if(1==flag2)
{
//风扇停
GPIOE->ODR &= (~(0X1<<9));
flag2=0;
}
//清除挂起中断标志位GICD_ICPENDRx
GICD->ICPENDR[3] |= (0x1<<2);
//清除中断触发标志位EXTI_FPR1
EXTI->FPR1 |= (0x1<<8);
break;
}
//清除处理完的中断号GICC_EOIR
GICC->EOIR =irqno;
}
include/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 key2_it_config();
void all_led_init();
void all_spi_init();
void all_fan_init();
#endifmain.c文章来源地址https://www.toymoban.com/news/detail-715353.html
#include "uart.h"
#include "key_it.h"
int main()
{
uart4_init();//串口初始化
all_led_init();
//中断初始化
key_it_config();
key2_it_config();
all_spi_init();
all_fan_init();
while(1)
{
//保证主程序不结束
}
return 0;
}
文章来源：https://www.toymoban.com/news/detail-715353.html
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