arm 写一段按键中断代码
main.c
#include "uart.h"
#include "key_it.h"
int main()
{
char c;
char *s;
uart4_init();//串口初始化
//中断初始化
key_it_config();
while(1)
{
//保证主程序不结束
}
return 0;
}
src/key_it.c
#include"key_it.h"
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;
}
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();
#endif
src/do_irq.c
#include"key_it.h"
//按键3的配置
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);
}
//按键1 按键2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));
//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;
}