key_it.c
#include"key_it.h"
void led_init()
{
// 设置GPIOE/GPIOF时钟使能
RCC->MP_AHB4ENSETR |= (0x3 << 4);
// 设置PE10/PE8/PF10为输出模式
GPIOE->MODER &= (~(0x3 << 20));
GPIOE->MODER |= (0x1 << 20);
GPIOE->MODER &= (~(0x3 << 16));
GPIOE->MODER |= (0x1 << 16);
GPIOF->MODER &= (~(0x3 << 20));
GPIOF->MODER |= (0x1 << 20);
// 设置PE10/PE8/PF10为推挽输出
GPIOE->OTYPER &= (~(0x1 << 10));
GPIOE->OTYPER &= (~(0X1 << 8));
GPIOF->OTYPER &= (~(0x1 << 10));
// 设置PE10/PE8/PF10输出速度为低速
GPIOE->OSPEEDR &= (~(0x3 << 20));
GPIOE->OSPEEDR &= (~(0X3 << 16));
GPIOF->OSPEEDR &= (~(0x3 << 20));
// 设置PE10/PE8/PF10无上拉下拉
GPIOE->PUPDR &= (~(0x3 << 20));
GPIOE->PUPDR &= (~(0X3 << 16));
GPIOF->PUPDR &= (~(0X3 << 20));
}
void key1_it_config()
{
//使能GPIOF时钟
RCC->MP_AHB4ENSETR |= (0x1<<5);
//设置PF9管脚为输入
GPIOF->MODER &= (~(0x3<<18));
//设置PF9作为EXTI9事件的输入
EXTI->EXTICR3 &= (~(0x1f<<8));
EXTI->EXTICR3 |= (0x05<<8);
//设置下降沿使能检测EXTI9事件
EXTI->FTSR1 |= (0x1<<9);
//设置EXTI9事件不屏蔽
EXTI->C1IMR1 |= (0x1<<9);
//GICD使能EXTI9(99号)中断
GICD->ISENABLER[3] |= (0x1<<3);
//GICD 设置99号中断的优先级
GICD->IPRIORITYR[24] &= (~(0x1f<<27));
//选择CPU0处理当前中断
GICD->ITARGETSR[24] |= (0x1<<24);
//全局使能组0中断被转发到GICC
GICD->CTRL |= (0X1);
//设置中断的优先级掩码
GICC->PMR |= (0x1f<<3);
//允许组0中断被CPU处理
GICC->CTRL |= (0x1);
}
void key2_it_config()
{
//设置PF7管脚为输入
GPIOF->MODER &= (~(0x3<<14));
//设置PF7作为EXTI7事件的输入
EXTI->EXTICR2 &= (~(0x1f<<24));
EXTI->EXTICR2 |= (0x05<<24);
//设置下降沿使能检测EXTI7事件
EXTI->FTSR1 |= (0x1<<7);
//设置EXTI7事件不屏蔽
EXTI->C1IMR1 |= (0x1<<7);
//GICD使能EXTI7(97号)中断
GICD->ISENABLER[3] |= (0x1<<1);
//GICD 设置97号中断的优先级
GICD->IPRIORITYR[24] &= (~(0x1f<<11));
//选择CPU0处理当前中断
GICD->ITARGETSR[24] |= (0x1<<8);
//全局使能组0中断被转发到GICC
GICD->CTRL |= (0X1);
//设置中断的优先级掩码
GICC->PMR |= (0x1f<<3);
//允许组0中断被CPU处理
GICC->CTRL |= (0x1);
}
void key3_it_config()
{
//设置PF8管脚为输入
GPIOF->MODER &= (~(0x3<<16));
//设置PF8作为EXTI8事件的输入
EXTI->EXTICR3 &= (~0x1f);
EXTI->EXTICR3 |= (0x05);
//设置下降沿使能检测EXTI8事件
EXTI->FTSR1 |= (0x1<<8);
//设置EXTI8事件不屏蔽
EXTI->C1IMR1 |= (0x1<<8);
//GICD使能EXTI8(98号)中断
GICD->ISENABLER[3] |= (0x1<<2);
//GICD 设置98号中断的优先级
GICD->IPRIORITYR[24] &= (~(0x1f<<19));
//选择CPU0处理当前中断
GICD->ITARGETSR[24] |= (0x1<<16);
//全局使能组0中断被转发到GICC
GICD->CTRL |= (0X1);
//设置中断的优先级掩码
GICC->PMR |= (0x1f<<3);
//允许组0中断被CPU处理
GICC->CTRL |= (0x1);
}
do_irq.c
#include "key_it.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void)
{
int irqno = (GICC->IAR & 0x3ff);
switch (irqno)
{
case 99: // key1
printf("KEY1_INT\n");
GPIOE->ODR |= (0x1<<10);
// 清除GICD的中断排队标志
GICD->ICPENDR[3] |= (0x1<<3);
// 清除exti的事件触发标志
EXTI->FPR1 |= (0x1<<9);
delay(2000);
GPIOE->ODR &= (~(0x1<<10));
break;
case 97: // KEY2
printf("KEY2_INT\n");
GPIOF->ODR |= (0x1<<10);
// 清除GICD的中断排队标志
GICD->ICPENDR[3] |= (0x1<<1);
// 清除exti的事件触发标志
EXTI->FPR1 |= (0x1<<7);
delay(2000);
GPIOF->ODR &= (~(0x1<<10));
break;
case 98: // key3
printf("KEY3_INT\n");
GPIOE->ODR |= (0x1<<8);
// 清除GICD的中断排队标志
GICD->ICPENDR[3] |= (0x1<<2);
// 清除exti的事件触发标志
EXTI->FPR1 |= (0x1<<8);
delay(2000);
GPIOE->ODR &= (~(0x1<<8));
break;
}
// 清除中断号
GICC->EOIR = irqno;
}
main.c文章来源:https://www.toymoban.com/news/detail-772614.html
#include "key_it.h"
void delay(int ms)
{
int i,j;
for(i=0;i<ms;i++)
{
for(j=0;j<2000;j++);
}
}
int main()
{
led_init();
key1_it_config();
key2_it_config();
key3_it_config();
while (1)
{
printf("do main...\n");
delay(1000);
}
return 0;
}
文章来源地址https://www.toymoban.com/news/detail-772614.html
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