key.h

  1 #ifndef __KEY_H__2 #define __KEY_H__3 4 #include "stm32mp1xx_gpio.h"5 #include "stm32mp1xx_gic.h"6 #include "stm32mp1xx_rcc.h"7 #include "stm32mp1xx_exti.h"8 9 10 //需要初始化GPIOF key1 = pf pin 911 void hal_gpio_key1_init(void);12 13 14 //初始化exti 15 void hal_exti_key1_init(void);16 17 //初始化gicd18 void hal_gicd_key1_init(void);19 20 //初始化gicc21 void hal_gicc_key1_init(void);22 23 #endif                                
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IRQ中断执行代码：

  1 #include "key.h"2 //#include "led.h"3 4 extern void printf(const char *fmt, ...);5 extern void delay_ms(int ms);6 7 unsigned int i = 0;8 void do_irq(void)9 {10     printf("key1 is pressed\n\r");11     //获取中断号12     i = GICC->IAR;13 14     printf("i = %d\n\r",i);15     i &= (0x3ff);16     //判断中断号17     if(99 == i)18     { 19 20   21         GICC->EOIR &= ~(0x3ff);             22         GICC->EOIR |= ((0x3ff)&i);  23             //clear                         24         //99/32 = 3---3                  25         GICD->ICPENDR[3] |= (0x1 <<3);26   27         EXTI->FPR1 |= (0x1 <<9);  28 29  30     //清除中断号以及中断挂起标志    31         32     }   33         34  35     return;36 }

key.c

  1 #include "key.h"                               2                                                3                                                4                                                5 //需要初始化GPIOF key1 = pf pin 9              6 void hal_gpio_key1_init(void)                  7 {                                              8     //RCC使能GPIOF                             9     RCC->MP_AHB4ENSETR |= (0X1 <<5);           10                                                11     //GPIOF pf9设置为input                     12     GPIOF->MODER &= ~(0x3 <<(9*2));            13                                                14     return;                                    15 }                                              16                                                17                                                18 //初始化exti                                   19 void hal_exti_key1_init(void)                  20 {                                              21     EXTI->EXTICR3 &= ~(0XFF <<8);              22     EXTI->EXTICR3 |= (0x05 <<8);               23                                                24     EXTI->FTSR1 |= (0X1 <<9);                  25                                                26     EXTI->C1IMR1 |= (0X1 <<9);                 27                                                28 /*                                             29     EXTI->FPR1 |= (0x1 <<9);                   30 */                                             31     return;                                    32 }                                              33                                                34 //初始化gicd                                   35 void hal_gicd_key1_init(void)                  36 {                                              37     GICD->CTRL |= (0X1);                       38                                                39     //BIT 3                                    40     GICD->ISENABLER[3] |= (0X1<<3);            41                                                42     //99/4 = 24---3; 3:24~31 -->24+3~31        43     GICD->IPRIORITYR[24] &= ~(0x1f <<27);      44     GICD->IPRIORITYR[24] |= (0x01 <<27);       45                                                46     //99/4 = 24---3; 3*8 = 24; [25~24]         47     GICD->ITARGETSR[24] &= ~(0x3 <<24);        48     GICD->ITARGETSR[24] |= (0x1 <<24);         49                                                50 /*                                             51     //clear                                    52     //99/32 = 3---3                            53     GICD->ICPENDR[3] |= (0x1 <<3);             54 */                                             55     return;                                    56 }                                              57                                                58 //初始化gicc                                   59 void hal_gicc_key1_init(void)                  60 {                                              61     GICC->CTRL |= (0x1<<0);                    62                                                63     GICC->PMR &= ~(0x1f <<3);                  64     GICC->PMR |= (0X11 <<3);                   65                                                66 /*                                             67                                                68     GICC->EOIR &= ~(0x3ff);                    69     GICC->EOIR |= ((0x3ff)&GICC->IAR);         70                                                71 */                                             72 }                                              73                                                74                                                75                                                
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main.c

  1 //#include "led.h"                       2 #include "key.h"                         3                                          4 extern void printf(const char *fmt, ...);5 void delay_ms(int ms)                    6 {                                        7     int i,j;                             8     for(i = 0; i < ms;i++)               9         for (j = 0; j < 1800; j++);      10 }                                        11                                          12                                          13 int main(void)                           14 {                                        15     hal_gpio_key1_init();                16                                          17     hal_exti_key1_init();                18                                          19     hal_gicd_key1_init();                20                                          21     hal_gicc_key1_init();                22     while(1)                             23     {                                    24         ;                                25     }                                    26     return 0;                            27 }                                        28 /*                                       29      LED1(INIT);//led1_init();           30     LED2(INIT);//led2_init();            31     LED3(INIT);//led3_init();            32     LED1(ON);//led1_on();                33         delay_ms(500);                   34         LED1(OFF);//led1_off();          35         delay_ms(500);                   36                                          37         LED2(ON);//led2_on();            38         delay_ms(500);                   39         LED2(OFF);//led2_off();          40         delay_ms(500);                   41                                          42         LED3(ON);//led3_on();            43         delay_ms(500);                   44         LED3(OFF);//led3_off();          45         delay_ms(500);                   46                                          47         LED2(ON);//led2_on();            48         delay_ms(500);                   49         LED2(OFF);//led2_off();          50         delay_ms(500);                   51                                          52                                          53 */                                       
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