• 2023年10月12日

    /src/key_it_c

    1. #include"key_it.h"
    2.  
    3. void led_init()
    4. {
    5. 	RCC->MP_AHB4ENSETR |= (0x1<<4);
    6. 	GPIOE->MODER &= (~(0x3<<20));
    7. 	GPIOE->MODER |= (0x1<<20);
    8. 	GPIOE->OTYPER &= (~(0x1<<10));
    9. 	GPIOE->OSPEEDR &= (~(0x3<<20));
    10. 	GPIOE->PUPDR &= (~(0x3<<16));
    11. }
    12.  
    13. void sp1_init()
    14. {
    15. 	RCC->MP_AHB4ENSETR |= (0x1<<1);
    16. 	GPIOB->MODER &= (~(0x3<<12));
    17. 	GPIOB->MODER |= (0x1<<12);
    18. 	GPIOB->OTYPER &= (~(0x1<<6));
    19. 	GPIOB->OSPEEDR &= (~(0x3<<12));
    20. 	GPIOB->PUPDR &= (~(0x3<<12));
    21. }
    22.  
    23. void fs_init()
    24. {
    25. 	GPIOE->MODER &= (~(0x3<<18));
    26. 	GPIOE->MODER |= (0x1<<18);
    27. 	GPIOE->OTYPER &= (~(0x1<<9));
    28. 	GPIOE->OSPEEDR &= (~(0x3<<18));
    29. 	GPIOE->PUPDR &= (~(0x3<<18));
    30. 	
    31. }
    32.  
    33. void key3_it_config()
    34. {
    35.     //RCC使能GPIOF时钟
    36.     RCC->MP_AHB4ENSETR |= (0x1<<5);
    37.     GPIOF->MODER &= (~(0x3<<16));
    38.     EXTI->EXTICR3 &=(~(0xFF<<0));
    39.     EXTI->EXTICR3 |= (0x5<<0);
    40.     EXTI->FTSR1 |= (0x1<<8);
    41.     EXTI->C1IMR1 |= (0x1<<8);
    42.     GICD->ISENABLER[3] |= (0X1<<2); 
    43.     GICD->IPRIORITYR[24] &= (~(0X1F<<19)); 
    44.     GICD->ITARGETSR[24]  &= (~(0X3<<16));
    45.     GICD->ITARGETSR[24] |= (0X1<<16);
    46. }
    47. void key_it_config()
    48. {
    49.     //RCC使能GPIOF时钟
    50.     RCC->MP_AHB4ENSETR |= (0x1<<5);
    51.     //设置PF9 PF7 PF8GPIO输入
    52.     //PF9
    53.     GPIOF->MODER &= (~(0x3<<18));
    54.     //PF8
    55.     // GPIOF->MODER &= (~(0x3<<16));
    56.     //pf7
    57.     GPIOF->MODER &= (~(0x3<<14));
    58.     //设置PF9 PF7 PF8产生EXTI事件 EXTI_EXTICRx
    59.     //pf7
    60.     EXTI->EXTICR2 &=(~(0xFF<<24));
    61.     EXTI->EXTICR2 |= (0x5<<24);
    62.     //pf8
    63.     // EXTI->EXTICR3 &=(~(0xFF<<0));
    64.     // EXTI->EXTICR3 |= (0x5<<0);
    65.     //pf9
    66.     EXTI->EXTICR3 &=(~(0xFF<<8));
    67.     EXTI->EXTICR3 |= (0x5<<8);
    68.     //设置事件触发方式为下降沿触发EXTI_FTSR1
    69.     //pf7
    70.     EXTI->FTSR1 |= (0x1<<7);
    71.     //pf8
    72.     // EXTI->FTSR1 |= (0x1<<8);
    73.     //pf9
    74.     EXTI->FTSR1 |= (0x1<<9);
    75.     //设置EXTI事件触发不屏蔽EXTI_IMR1
    76.     //PF7
    77.     EXTI->C1IMR1 |= (0x1<<7);
    78.     //PF8
    79.     // EXTI->C1IMR1 |= (0x1<<8);
    80.     //PF9
    81.     EXTI->C1IMR1 |= (0x1<<9);
    82.     //使能中断能转发到特定的CPU接口层GICD_ISENABLERx
    83.     //PF7 97号中断
    84.     GICD->ISENABLER[3] |= (0X1<<1); 
    85.     //PF78 98号中断
    86.     // GICD->ISENABLER[3] |= (0X1<<2); 
    87.     //PF9 99号中断
    88.     GICD->ISENABLER[3] |= (0X1<<3); 
    89.     // GICD_ISENABLERx设置中断优先级
    90.     //PF7
    91.     GICD->IPRIORITYR[24] &= (~(0X1F<<11)); 
    92.     //PF8
    93.     // GICD->IPRIORITYR[24] &= (~(0X1F<<19)); 
    94.     //PF9
    95.     GICD->IPRIORITYR[24] &= (~(0X1F<<27)); 
    96.     //设置当前中断被转发到哪一个CPU处理GICD_ITARGETSRx
    97.     //pf7 97中断
    98.     GICD->ITARGETSR[24]  &= (~(0X3<<8));
    99.     GICD->ITARGETSR[24] |= (0X1<<8);
    100.     //pf8 98中断
    101.     // GICD->ITARGETSR[24]  &= (~(0X3<<16));
    102.     // GICD->ITARGETSR[24] |= (0X1<<16);
    103.     //pf9 99中断
    104.     GICD->ITARGETSR[24]  &= (~(0X3<<24));
    105.     GICD->ITARGETSR[24] |= (0X1<<24);
    106.     //使能组0转发中断GICD_CTLR
    107.     GICD->CTRL |= 0X1;
    108.     //设置中断优先级掩码GICC_PMR
    109.     GICC->PMR |= (0x1F<<3);
    110.  
    111.     //使能CPU可以处理组0转发的中断GICC_CTLR
    112.     GICC->CTRL |= 0X1;
    113.  
    114.     
    115. }

    /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.     int irqno; // 保存中断号
    7.     printf("%d\n",irqno);
    8.     irqno = GICC->IAR & 0X3FF;
    9.     switch (irqno)
    10.     {
    11.     case 99: // key1
    12.         // 按键1中断处理
    13.         printf("KEY1 INT\n");
    14. 		if(GPIOE->ODR & (0x1<<10))
    15. 		{
    16. 			GPIOE->ODR &= (~(0x1<<10));		
    17. 		}else
    18. 		{
    19. 			GPIOE->ODR |= (0x1<<10);
    20. 		}
    21.         // 清除挂起中断标志位GICD_ICPENDRx
    22.         GICD->ICPENDR[3] |= (0x1 << 3);
    23.  
    24.         // 清除中断触发标志位EXTI_FPR1
    25.         EXTI->FPR1 |= (0x1 << 9);
    26.         break;
    27.     case 97: // key2
    28.         // 按键2中断处理
    29.         printf("KEY2 INT\n");
    30. 		if(GPIOB->ODR & (0x1<<6))
    31. 		{
    32. 			GPIOB->ODR &= (~(0x1<<6));		
    33. 		}else
    34. 		{
    35. 			GPIOB->ODR |= (0x1<<6);
    36. 		}
    37.         // 清除挂起中断标志位GICD_ICPENDRx
    38.         // 清除挂起中断标志位GICD_ICPENDRx
    39.         GICD->ICPENDR[3] |= (0x1 << 1);
    40.         // 清除中断触发标志位EXTI_FPR1
    41.         EXTI->FPR1 |= (0x1 << 7);
    42.         break;
    43.     case 98: // key3
    44.         // 按键3中断处理
    45.         printf("KEY3 INT\n");
    46. 		if(GPIOE->ODR & (0x1<<9))
    47. 		{
    48. 			GPIOE->ODR &= (~(0x1<<9));		
    49. 		}else
    50. 		{
    51. 			GPIOE->ODR |= (0x1<<9);
    52. 		}
    53.         // 清除挂起中断标志位GICD_ICPENDRx
    54.         GICD->ICPENDR[3] |= (0x1 << 2);
    55.         // 清除中断触发标志位EXTI_FPR1
    56.         EXTI->FPR1 |= (0x1 << 8);
    57.         break;
    58.     }
    59.     // 清除处理完的中断号GICC_EOIR
    60.     GICC->EOIR = irqno;
    61. }
    62.

    main.c

    1. #include "uart.h"
    2. #include "key_it.h"
    3. int main()
    4. {
    5.     char c;
    6.     char *s;
    7.     uart4_init();//串口初始化
    8.     //中断初始化
    9. 	led_init();
    10. 	fs_init();
    11. 	sp1_init();
    12.     key_it_config();
    13. 	key3_it_config();
    14.     while(1)
    15.     {
    16.         //保证主程序不结束
    17.     }
    18.     return 0;
    19. }

    /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. void key_it_config();
    8. void led_init();
    9. void sp1_init();
    10. void fs_init();
    11.  
    12. #endif

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  • 原文地址：https://blog.csdn.net/2201_75732711/article/details/133797931