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三个按键中断,控制对应灯亮灭
main.c
- #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()
-
- {
-
- all_led_init();
-
- key1_it_config();
-
- key2_it_config();
-
- key3_it_config();
-
- while(1)
-
- {
-
- printf("do main...\n");
-
- delay(1000);
-
- }
-
- }
-
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:
- printf("KEY1_INT\n");
- led1_on();
- led2_off();
- led3_off();
- //求出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);
- break;
-
- case 97:
- printf("KEY2_INT\n");
- led1_off();
- led2_on();
- led3_off();
- GICD->ICPENDR[1] |= (0x1);
- EXTI->FPR1 |= (0x1<<7);
- break;
-
- case 98:
- printf("KEY3_INT\n");
- led1_off();
- led2_off();
- led3_on();
- GICD->ICPENDR[2] |= (0x1<<2);
- EXTI->FPR1 |= (0x1<<8);
- break;
- }
- GICC->EOIR = irqno;
- }
key_it.c
- #include "key_it.h"
- 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()
- {
- //使能GPIOF时钟
- //RCC->MP_AHB4ENSETR |= (0x1<<5);
- //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EXTI9事件
- EXTI->FTSR1 |=(0x1<<7);
- //设置EXTI7事件不屏蔽
- EXTI->C1IMR1 |=(0x1<<7);
- //GICO使能EXTI7(97号)中断
- GICD->ISENABLER[3] |=(0x1<<1);
- //GICO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()
- {
- //使能GPIOF时钟
- RCC->MP_AHB4ENSETR |= (0x1<<5);
- //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EXTI9事件不屏蔽
- EXTI->C1IMR1 |=(0x1<<8);
- //GICO使能EXTI8(98号)中断
- GICD->ISENABLER[3] |=(0x1<<2);
- //GICO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);
- }
-
-
key_it.h
- #ifndef __KEY_IT_H__
- #define __KEY_IT_H__
- #include "stm32mp1xx_gpio.h"
- #include "stm32mp1xx_gic.h"
- #include "stm32mp1xx_exti.h"
- #include "stm32mp1xx_rcc.h"
- #include"stm32mp1xx_uart.h"
-
- void key1_it_config();
- void key2_it_config();
- void key3_it_config();
-
- void all_led_init();
- void led1_on();
- void led1_off();
- void led2_on();
- void led2_off();
- void led3_on();
- void led3_off();
- #endif
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