代码示例
key.h
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gic.h"
/********PF9----KEY1***********/
//初始化EXIT层
void pf9_exti_init();
//初始化GICD层
void pf9_gicd_init();
//初始化GICC层
void gicc_init();
//初始化EXIT层
void pf8_exti_init();
//初始化GICD层
void pf8_gicd_init();
//初始化EXIT层
void pf7_exti_init();
//初始化GICD层
void pf7_gicd_init();
#endif
key.c
#include "key.h"
/********PF9----KEY1***********/
//初始化EXIT层
void pf9_exti_init()
{
/******RCC章节初始化****/
//1.设置GPIOF时钟使能
RCC->MP_AHB4ENSETR |= (0X1<<5);
/******GPIO章节初始化****/
//1.设置PF9引脚输入模式
GPIOF->MODER &= (~(0X3<<18));
/******EXIT章节初始化****/
//1.设置PF9引脚和EXTI9控制器进行连接
EXTI->EXTICR3 |= (0X05<<8);
//2.设置PF9引脚检测方式下降沿检测
EXTI->FTSR1 |= (0X1<<9);
//3.设置PF9引脚中断不屏蔽
EXTI->C1IMR1 |= (0X1<<9);
}
void pf8_exti_init()
{
GPIOF->MODER &= (~(0X3<<16));
//1.设置PF8引脚和EXTI8控制器进行连接
EXTI->EXTICR3 |= (0X05<<0);
//2.设置PF8引脚检测方式下降沿检测
EXTI->FTSR1 |= (0X1<<8);
//3.设置PF8引脚中断不屏蔽
EXTI->C1IMR1 |= (0X1<<8);
}
void pf7_exti_init()
{
GPIOF->MODER &= (~(0X3<<14));
//1.设置PF7引脚和EXTI7控制器进行连接
EXTI->EXTICR2 |= (0X05<<24);
//2.设置PF7引脚检测方式下降沿检测
EXTI->FTSR1 |= (0X1<<7);
//3.设置PF7引脚中断不屏蔽
EXTI->C1IMR1 |= (0X1<<7);
}
//初始化GCID层
void pf9_gicd_init()
{
//1.设置GICD层全局中断使能
GICD->CTLR |= 0X1;
//2.设置GICD层中断使能寄存器
GICD->ISENABLER[3] |= (0X1<<3);
//3.设置GICD层中断优先级寄存器
GICD->IPRIORITYR[24] |= (0X1<<27);
//4.设置GICD层中断目标分配
GICD->ITARGETSR[24] |= (0X1<<24);
}
void pf8_gicd_init()
{
//1.设置GICD层全局中断使能
//2.设置GICD层中断使能寄存器
GICD->ISENABLER[3] |= (0X1<<2);
//3.设置GICD层中断优先级寄存器
GICD->IPRIORITYR[24] |= (0X1<<19);
//4.设置GICD层中断目标分配
GICD->ITARGETSR[24] |= (0X1<<16);
}
void pf7_gicd_init()
{
//1.设置GICD层全局中断使能
//2.设置GICD层中断使能寄存器
GICD->ISENABLER[3] |= (0X1<<1);
//3.设置GICD层中断优先级寄存器
GICD->IPRIORITYR[24] |= (0X1<<11);
//4.设置GICD层中断目标分配
GICD->ITARGETSR[24] |= (0X1<<8);
}
//初始化GICC层
void gicc_init()
{
//1.设置GICC层全局中断使能寄存器
GICC->CTLR |= 0X1;
//2.设置GICC层中断优先级寄存器
GICC->PMR |= (0X5<<3);
}
do_irq.c
#include "key.h"
extern void printf(const char *fmt, ...);
extern void delay_ms(int ms);
void do_irq(void)
{
unsigned int num = 0;
//获取中断号
num = GICC->IAR & 0X3FF;
switch(num)
{
case 97:
delay_ms(500);
printf("key2#######\n");
//清除EXTI层中断挂起标志位
EXTI->FPR1 |= (0X1<<7);
//清楚GICD层中断挂起标志位
GICD->ICPENDR[3] |=(0X1<<1);
break;
case 98:
delay_ms(500);
printf("key3#######\n");
//清除EXTI层中断挂起标志位
EXTI->FPR1 |= (0X1<<8);
//清楚GICD层中断挂起标志位
GICD->ICPENDR[3] |=(0X1<<2);
break;
case 99:
delay_ms(500);
printf("key1#######\n");
//清除EXTI层中断挂起标志位
EXTI->FPR1 |= (0X1<<9);
//清楚GICD层中断挂起标志位
GICD->ICPENDR[3] |=(0X1<<3);
break;
}
//清除中断号
GICC->EOIR &= (~(0X3FF));
GICC->EOIR |= num;
}
main.c
#include "key.h"
extern void printf(const char *fmt, ...);
void delay_ms(int ms)
{
int i,j;
for(i = 0; i < ms;i++)
for (j = 0; j < 1800; j++);
}
int main()
{
//1.EXTI初始化
pf9_exti_init();
//2.GICD初始化
pf9_gicd_init();
//初始化EXIT层
pf8_exti_init();
//初始化GICD层
pf8_gicd_init();
//初始化EXIT层
pf7_exti_init();
//初始化GICD层
pf7_gicd_init();
//3.GICC初始化
gicc_init();
while(1)
{
}
return 0;
}
测试结果
本文含有隐藏内容,请 开通VIP 后查看