ARM的学习

键控灯

mykey.h

#ifndef __MYKEY_H__
#define __MYKEY_H__
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_exti.h"
void key1_int_config();
void key2_int_config();
void key3_int_config();#endif

mykey.c

#include "mykey.h"void key1_int_config()
{//使能GPIO外设时钟RCC->MP_AHB4ENSETR |=(0x1<<5);//设置PF9为输入GPIOF->MODER &=(~(0x3<<18));//设置PF9产生EXTI9事件EXTI->EXTICR3 &=(~(0xff << 8));EXTI->EXTICR3 |=(0x05 << 8);//设置下降沿检测EXTI9事件EXTI->FTSR1 |= (0x1 << 9);//取消EXTI9事件的屏蔽EXTI->C1IMR1 |= (0x1 << 9);// 全局使能99号中断GICD->ISENABLER[3] |= (0x1 << 3);//设置99号中断的优先级GICD->IPRIORITYR[24] &=(~(0x1f << 27));//设置99号中断的目标处理器GICD->ITARGETSR[24] |=(0x1 <<24);//允许组0中断被转发到GICC层GICD->CTRL |= 0x1;// 设置中断优先级掩码GICC->PMR |=(0x1f << 3);// 允许组0中断被转发给处理器GICC->CTRL |= 0x1;
}void key2_int_config()
{
//使能GPIO外设时钟RCC->MP_AHB4ENSETR |=(0x1<<5);//设置PF7为输入GPIOF->MODER &=(~(0x3<<14));//设置PF7产生EXTI7事件EXTI->EXTICR2 &=(~(0xff << 24));EXTI->EXTICR2 |=(0x05 << 24);//设置下降沿检测EXTI7事件EXTI->FTSR1 |= (0x1 << 7);//取消EXTI7事件的屏蔽EXTI->C1IMR1 |= (0x1 << 7);// 全局使能97号中断GICD->ISENABLER[3] |= (0x1 << 1);//设置97号中断的优先级GICD->IPRIORITYR[24] &=(~(0x1f << 11));//设置97号中断的目标处理器GICD->ITARGETSR[24] |=(0x1 <<8);//允许组0中断被转发到GICC层GICD->CTRL |= 0x1;// 设置中断优先级掩码GICC->PMR |=(0x1f << 3);// 允许组0中断被转发给处理器GICC->CTRL |= 0x1;
}void key3_int_config()
{//使能GPIO外设时钟RCC->MP_AHB4ENSETR |=(0x1<<5);//设置PF8为输入GPIOF->MODER &=(~(0x3<<16));//设置PF8产生EXTI8事件EXTI->EXTICR3 &=(~(0xff ));EXTI->EXTICR3 |=(0x05 );//设置下降沿检测EXTI8事件EXTI->FTSR1 |= (0x1 << 8);//取消EXTI8事件的屏蔽EXTI->C1IMR1 |= (0x1 << 8);// 全局使能98号中断GICD->ISENABLER[3 ]|= (0x1 << 2);//设置98号中断的优先级GICD->IPRIORITYR[24] &=(~(0x1f << 19));//设置98号中断的目标处理器GICD->ITARGETSR[24] |=(0x1 <<16);//允许组0中断被转发到GICC层GICD->CTRL |= 0x1;// 设置中断优先级掩码GICC->PMR |=(0x1f << 3);// 允许组0中断被转发给处理器GICC->CTRL |= 0x1;}

do_irq.c

#include "mykey.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{//获取中断号unsigned int irqno=(GICC->IAR&0x3ff);switch(irqno){case 99://中断处理逻辑i=!i;if(i==0)GPIOE->ODR |=(0x1<<10);elseGPIOE->ODR &=(~(0x1<<10));//清除GICD的中断标志GICD->ICPENDR[3] |=(0X1<<3);//清除EXTI中的中断触发标志EXTI->FPR1 |=(0x1<<9);break;case 98://中断处理逻辑i=!i;if(i==0)GPIOE->ODR |=(0x1<<8);elseGPIOE->ODR &=(~(0x1<<8));//清除GICD的中断标志GICD->ICPENDR[3] |=(0X1<<2);//清除EXTI中的中断触发标志EXTI->FPR1 |=(0x1<<8);break;case 97://中断处理逻辑i=!i;if(i==0)GPIOF->ODR |=(0x1<<10);elseGPIOF->ODR &=(~(0x1<<10));//清除GICD的中断标志GICD->ICPENDR[3] |=(0X1<<1);//清除EXTI中的中断触发标志EXTI->FPR1 |=(0x1<<7);break;}//清除IAR寄存器中保存的中断号GICC->EOIR=irqno;
}

main.c

#include "mykey.h"#include "uart4.h"//手动封装延时函数void delay_ms(int ms){int i,j;for(i=0;i<ms;i++){for(j=0;j<2000;j++){}}}int main(){//按键中断初始化key1_int_config();key2_int_config();key3_int_config();//串口初始化uart4_config();//char str[100];while(1){//死循环不让程序结束}return 0;}