main.c:
#include "uart.h"
#include "key_it.h"
int main()
{
all_led_init();
uart4_init();//串口初始化
//中断初始化
key_it_config();
key3_it_config();
buzzer_init();
fan_init();
while(1)
{
//保证主程序不结束
}
return 0;
}
src/key_it.c:
#include"key_it.h"
void key3_it_config()
{
//RCC使能GPIOF时钟
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;
}
void all_led_init()
{
//RCC使能
RCC->MP_AHB4ENSETR |= (0x3<<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 buzzer_init()
{
//RCC使能
RCC->MP_AHB4ENSETR |= (0x1<<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 fan_init(){
//RCC使能
RCC->MP_AHB4ENSETR |= (0x1<<4);
//设置PE9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));
}
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 key3_it_config();
void all_led_init();
void buzzer_init();
void fan_init();
#endifdo_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("KEY1 INT\n");
GPIOE->ODR ^=(0X1<<10);
//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");
GPIOB->ODR ^=(0x1<<6);
//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");
GPIOE->ODR ^=(0x1<<9);
//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;
}
