• 设置按键中断，按键1按下，LED亮，再按一次，灭按键2按下，蜂鸣器响。再按一次，不响按键3按下，风扇转，再按一次，风扇停

    src/key_it.c

    1. #include"key_it.h"
    2. //GPIO初始化
    3. void all_led_init()
    4. {
    5.     //RCC使能
    6.     RCC->MP_AHB4ENSETR  |= (0X1<<4);
    7.     //设置PE10 PF10 PE8为输出
    8.     GPIOE->MODER &= (~(0X3<<20));
    9.     GPIOE->MODER |= (0X1<<20);
    10.     //设置推挽输出
    11.     GPIOE->OTYPER &= (~(0X1<<10)); 
    12.     //设置三个管脚低速输出
    13.     GPIOE->OSPEEDR &= (~(0X3<<20));
    14.     //设置三个管脚输出时无上拉电阻和下拉电阻    
    15.     GPIOE->PUPDR &= (~(0X3<<20));
    16. }
    17. void all_spi_init()
    18. {
    19.     //RCC使能
    20.     RCC->MP_AHB4ENSETR  |= (0X3<<1);
    21.     //设置PE10 PF10 PE8为输出
    22.     GPIOB->MODER &= (~(0X3<<12));
    23.     GPIOB->MODER |= (0X1<<12);
    24.     //设置推挽输出
    25.     GPIOB->OTYPER &= (~(0X1<<6)); 
    26.     //设置三个管脚低速输出
    27.     GPIOB->OSPEEDR &= (~(0X3<<12));
    28.     //设置三个管脚输出时无上拉电阻和下拉电阻    
    29.     GPIOB->PUPDR &= (~(0X3<<12));
    30. }
    31. void all_fan_init()
    32. {
    33.     //RCC使能
    34.     RCC->MP_AHB4ENSETR  |= (0X3<<4);
    35.     //设置PE10 PF10 PE8为输出
    36.     GPIOE->MODER &= (~(0X3<<18));
    37.     GPIOE->MODER |= (0X1<<18);
    38.     //设置推挽输出
    39.     GPIOE->OTYPER &= (~(0X1<<9)); 
    40.     //设置三个管脚低速输出
    41.     GPIOE->OSPEEDR &= (~(0X3<<18));
    42.     //设置三个管脚输出时无上拉电阻和下拉电阻    
    43.     GPIOE->PUPDR &= (~(0X3<<18));
    44. }
    45. //按键2的配置
    46. void key2_it_config()
    47. {
    48.     //RCC使能GPIOF时钟
    49.     RCC->MP_AHB4ENSETR |= (0x1<<5);
    50.     //pf7
    51.     GPIOF->MODER &= (~(0x3<<14));
    52.     //pf7
    53.     EXTI->EXTICR2 &=(~(0xFF<<24));
    54.     EXTI->EXTICR2 |= (0x5<<24);
    55.     //pf7
    56.     EXTI->FTSR1 |= (0x1<<7);
    57.     //PF7
    58.     EXTI->C1IMR1 |= (0x1<<7);
    59.     //PF7 97号中断
    60.     GICD->ISENABLER[3] |= (0X1<<1); 
    61.     //PF7
    62.     GICD->IPRIORITYR[24] &= (~(0X1F<<11)); 
    63.     //pf7 97中断
    64.     GICD->ITARGETSR[24]  &= (~(0X3<<8));
    65.     GICD->ITARGETSR[24] |= (0X1<<8);
    66. }
    67. //按键1 按键3以及GICC层的配置
    68. void key_it_config()
    69. {
    70.     //RCC使能GPIOF时钟
    71.     RCC->MP_AHB4ENSETR |= (0x1<<5);
    72.     //设置PF9 PF7 PF8GPIO输入
    73.     //PF9
    74.     GPIOF->MODER &= (~(0x3<<18));
    75.     //PF8
    76.     GPIOF->MODER &= (~(0x3<<16));
    77.     //设置PF9 PF7 PF8产生EXTI事件 EXTI_EXTICRx
    78.     //pf8
    79.     EXTI->EXTICR3 &=(~(0xFF<<0));
    80.     EXTI->EXTICR3 |= (0x5<<0);
    81.     //pf9
    82.     EXTI->EXTICR3 &=(~(0xFF<<8));
    83.     EXTI->EXTICR3 |= (0x5<<8);
    84.     //设置事件触发方式为下降沿触发EXTI_FTSR1
    85.     //pf8
    86.     EXTI->FTSR1 |= (0x1<<8);
    87.     //pf9
    88.     EXTI->FTSR1 |= (0x1<<9);
    89.     //设置EXTI事件触发不屏蔽EXTI_IMR1
    90.     //PF8
    91.     EXTI->C1IMR1 |= (0x1<<8);
    92.     //PF9
    93.     EXTI->C1IMR1 |= (0x1<<9);
    94.     //使能中断能转发到特定的CPU接口层GICD_ISENABLERx
    95.     //PF8 98号中断
    96.     GICD->ISENABLER[3] |= (0X1<<2); 
    97.     //PF9 99号中断
    98.     GICD->ISENABLER[3] |= (0X1<<3); 
    99.     //GICD_ISENABLERx设置中断优先级
    100.     //PF8
    101.     GICD->IPRIORITYR[24] &= (~(0X1F<<19)); 
    102.     //PF9
    103.     GICD->IPRIORITYR[24] &= (~(0X1F<<27)); 
    104.     //设置当前中断被转发到哪一个CPU处理GICD_ITARGETSRx
    105.     //pf8 98中断
    106.     GICD->ITARGETSR[24]  &= (~(0X3<<16));
    107.     GICD->ITARGETSR[24] |= (0X1<<16);
    108.     //pf9 99中断
    109.     GICD->ITARGETSR[24]  &= (~(0X3<<24));
    110.     GICD->ITARGETSR[24] |= (0X1<<24);
    111.     //使能组0转发中断GICD_CTLR
    112.     GICD->CTRL |= 0X1;
    113.     //设置中断优先级掩码GICC_PMR
    114.     GICC->PMR |= (0x1F<<3);
    115.  
    116.     //使能CPU可以处理组0转发的中断GICC_CTLR
    117.     GICC->CTRL |= 0X1;
    118.  
    119.     
    120. }
    121.

    src/do_irq.c

    1.     #include "key_it.h"
    2.     extern void printf(const char *fmt, ...);
    3.     unsigned int i = 0;
    4.     void do_irq(void) 
    5.     {
    6.         static int flag=0;
    7.         static int flag1=0;
    8.         static int flag2=0;
    9.         int irqno;//保存中断号
    10.             irqno=GICC->IAR & 0X3FF;
    11.             switch(irqno)
    12.             {
    13.                 case 99://key1
    14.                     //按键1中断处理
    15.                     //printf("KEY1 INT\n");
    16.                         if(0==flag)
    17.                         {
    18.                             //LED1亮
    19.                            GPIOE->ODR |= (0X1<<10);
    20.                             flag=1;
    21.                         }
    22.                         else if(1==flag)
    23.                         {
    24.                             //LED1灭
    25.                              GPIOE->ODR &= (~(0X1<<10));
    26.                             flag=0;
    27.                         }
    28.             //清除挂起中断标志位GICD_ICPENDRx
    29.                 GICD->ICPENDR[3] |= (0x1<<3);
    30.             //清除中断触发标志位EXTI_FPR1
    31.                 EXTI->FPR1 |= (0x1<<9);
    32.                 break;
    33.             case 97://key2
    34.                 //按键2中断处理
    35.                 //printf("KEY2 INT\n");
    36.                         if(0==flag1)
    37.                         {
    38.                             //蜂鸣器响
    39.                            GPIOB->ODR |= (0X1<<6);
    40.                             flag1=1;
    41.                         }
    42.                         else if(1==flag1)
    43.                         {
    44.                             //蜂鸣器不响
    45.                              GPIOB->ODR &= (~(0X1<<6));
    46.                             flag1=0;
    47.                         }
    48.         //清除挂起中断标志位GICD_ICPENDRx
    49.         GICD->ICPENDR[3] |= (0x1<<1);
    50.         //清除中断触发标志位EXTI_FPR1
    51.         EXTI->FPR1 |= (0x1<<7);
    52.                 break;
    53.             case 98://key3
    54.                 //按键3中断处理
    55.                // printf("KEY3 INT\n");
    56.                         if(0==flag2)
    57.                         {
    58.                             //风扇转
    59.                            GPIOE->ODR |= (0X1<<9);
    60.                             flag2=1;
    61.                         }
    62.                         else if(1==flag2)
    63.                         {
    64.                             //风扇停
    65.                              GPIOE->ODR &= (~(0X1<<9));
    66.                             flag2=0;
    67.                         }
    68.         //清除挂起中断标志位GICD_ICPENDRx
    69.         GICD->ICPENDR[3] |= (0x1<<2);
    70.         //清除中断触发标志位EXTI_FPR1
    71.         EXTI->FPR1 |= (0x1<<8);
    72.                 break;
    73.         }
    74.         //清除处理完的中断号GICC_EOIR
    75.         GICC->EOIR =irqno;
    76.     }
    77.

    include/key_it.h

    1. #ifndef __KEY_IT_H__
    2. #define __KEY_IT_H__
    3. #include "stm32mp1xx_rcc.h"
    4. #include "stm32mp1xx_gpio.h"
    5. #include "stm32mp1xx_exti.h"
    6. #include "stm32mp1xx_gic.h"
    7.  
    8. void key_it_config();
    9. void key2_it_config();
    10. void all_led_init();
    11. void all_spi_init();
    12. void all_fan_init();
    13.  
    14. #endif

    main.c

    1. #include "uart.h"
    2.  
    3. #include "key_it.h"
    4.  
    5.  
    6.  
    7. int main()
    8.  
    9. {
    10.  
    11.  
    12.     uart4_init();//串口初始化
    13.  
    14.     all_led_init();
    15.  
    16.     //中断初始化
    17.  
    18.     key_it_config();
    19.  
    20. 	key2_it_config();
    21.  
    22.     all_spi_init();
    23.  
    24.     all_fan_init();
    25.  
    26.     while(1)
    27.  
    28.     {
    29.  
    30.         //保证主程序不结束
    31.  
    32.     }  
    33.  
    34. 	return 0;
    35.  
    36.  
    37. }
    38.

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  • 原文地址：https://blog.csdn.net/yjh666jhy/article/details/133797963