• arm day 9

    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。

    main.c

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

    key_it.c

    1. #include"key_it.h"
    2.  
    3. //延时函数
    4. void delay1(int ms)
    5. {
    6. 	for(int i=0;i
    7. 	{
    8. 		for(int j=0;j<2000;i++);
    9. 	}
    10. }
    11.  
    12. //灯
    13. void led1_init()
    14. {
    15. 	//RCC使能
    16. 	RCC->MP_AHB4ENSETR |= (0x3<<4);
    17.     //设置PE10为输出
    18.     GPIOE->MODER &= (~(0X3<<20));
    19.     GPIOE->MODER |= (0X1<<20);
    20.     //设置推挽输出
    21.     GPIOE->OTYPER &= (~(0X1<<10));
    22.     //设置三个管脚低速输出
    23.     GPIOE->OSPEEDR &= (~(0X3<<20));
    24.     //设置三个管脚输出时无上拉电阻和下拉电阻    
    25.     GPIOE->PUPDR &= (~(0X3<<20));
    26. }
    27.  
    28. //蜂鸣器
    29. void spi_init()
    30. {
    31. 	//RCC使能
    32. 	RCC->MP_AHB4ENSETR |= (0x3<<1);
    33. 	//设置PB6为输出
    34. 	GPIOB->MODER &= (~(0x3<<12));
    35. 	GPIOB->MODER |= (0x1<<12);
    36. 	//设置推挽输出
    37. 	GPIOB->OTYPER &= (~(0x1<<6));
    38. 	//设置速度
    39. 	GPIOB->OSPEEDR &= (~(0x3<<12));
    40. 	//设置管脚输出时无上拉电阻和下拉电阻
    41. 	GPIOB->PUPDR &= (~(0x3<<12));
    42. }
    43.  
    44. //风扇
    45. void fan_init()
    46. {	
    47. 	//RCC使能
    48. 	RCC->MP_AHB4ENSETR |= (0x3<<4);
    49.     //设置PE10为输出
    50.     GPIOE->MODER &= (~(0X3<<18));
    51.     GPIOE->MODER |= (0X1<<18);
    52.     //设置推挽输出
    53.     GPIOE->OTYPER &= (~(0X1<<9));
    54.     //设置三个管脚低速输出
    55.     GPIOE->OSPEEDR &= (~(0X3<<18));
    56.     //设置三个管脚输出时无上拉电阻和下拉电阻    
    57.     GPIOE->PUPDR &= (~(0X3<<18));
    58. 	
    59. }
    60.  
    61. //按键3的配置
    62. void key3_it_config()
    63. {
    64.     //RCC使能GPIOF时钟
    65.     RCC->MP_AHB4ENSETR |= (0x1<<5);
    66.     GPIOF->MODER &= (~(0x3<<16));
    67.     EXTI->EXTICR3 &=(~(0xFF<<0));
    68.     EXTI->EXTICR3 |= (0x5<<0);
    69.     EXTI->FTSR1 |= (0x1<<8);
    70.     EXTI->C1IMR1 |= (0x1<<8);
    71.     GICD->ISENABLER[3] |= (0X1<<2); 
    72.     GICD->IPRIORITYR[24] &= (~(0X1F<<19)); 
    73.     GICD->ITARGETSR[24]  &= (~(0X3<<16));
    74.     GICD->ITARGETSR[24] |= (0X1<<16);
    75. }
    76.  
    77. //按键1 按键2以及GICC层的配置
    78. void key_it_config()
    79. {
    80.     //RCC使能GPIOF时钟
    81.     RCC->MP_AHB4ENSETR |= (0x1<<5);
    82.     //设置PF9 PF7 PF8GPIO输入
    83.     //PF9
    84.     GPIOF->MODER &= (~(0x3<<18));
    85.     //PF8
    86.     // GPIOF->MODER &= (~(0x3<<16));
    87.     //pf7
    88.     GPIOF->MODER &= (~(0x3<<14));
    89.     //设置PF9 PF7 PF8产生EXTI事件 EXTI_EXTICRx
    90.     //pf7
    91.     EXTI->EXTICR2 &=(~(0xFF<<24));
    92.     EXTI->EXTICR2 |= (0x5<<24);
    93.     //pf8
    94.     // EXTI->EXTICR3 &=(~(0xFF<<0));
    95.     // EXTI->EXTICR3 |= (0x5<<0);
    96.     //pf9
    97.     EXTI->EXTICR3 &=(~(0xFF<<8));
    98.     EXTI->EXTICR3 |= (0x5<<8);
    99.     //设置事件触发方式为下降沿触发EXTI_FTSR1
    100.     //pf7
    101.     EXTI->FTSR1 |= (0x1<<7);
    102.     //pf8
    103.     // EXTI->FTSR1 |= (0x1<<8);
    104.     //pf9
    105.     EXTI->FTSR1 |= (0x1<<9);
    106.     //设置EXTI事件触发不屏蔽EXTI_IMR1
    107.     //PF7
    108.     EXTI->C1IMR1 |= (0x1<<7);
    109.     //PF8
    110.     // EXTI->C1IMR1 |= (0x1<<8);
    111.     //PF9
    112.     EXTI->C1IMR1 |= (0x1<<9);
    113.     //使能中断能转发到特定的CPU接口层GICD_ISENABLERx
    114.     //PF7 97号中断
    115.     GICD->ISENABLER[3] |= (0X1<<1); 
    116.     //PF78 98号中断
    117.     // GICD->ISENABLER[3] |= (0X1<<2); 
    118.     //PF9 99号中断
    119.     GICD->ISENABLER[3] |= (0X1<<3); 
    120.     // GICD_ISENABLERx设置中断优先级
    121.     //PF7
    122.     GICD->IPRIORITYR[24] &= (~(0X1F<<11)); 
    123.     //PF8
    124.     // GICD->IPRIORITYR[24] &= (~(0X1F<<19)); 
    125.     //PF9
    126.     GICD->IPRIORITYR[24] &= (~(0X1F<<27)); 
    127.     //设置当前中断被转发到哪一个CPU处理GICD_ITARGETSRx
    128.     //pf7 97中断
    129.     GICD->ITARGETSR[24]  &= (~(0X3<<8));
    130.     GICD->ITARGETSR[24] |= (0X1<<8);
    131.     //pf8 98中断
    132.     // GICD->ITARGETSR[24]  &= (~(0X3<<16));
    133.     // GICD->ITARGETSR[24] |= (0X1<<16);
    134.     //pf9 99中断
    135.     GICD->ITARGETSR[24]  &= (~(0X3<<24));
    136.     GICD->ITARGETSR[24] |= (0X1<<24);
    137.     //使能组0转发中断GICD_CTLR
    138.     GICD->CTRL |= 0X1;
    139.     //设置中断优先级掩码GICC_PMR
    140.     GICC->PMR |= (0x1F<<3);
    141.  
    142.     //使能CPU可以处理组0转发的中断GICC_CTLR
    143.     GICC->CTRL |= 0X1;
    144.  
    145.     
    146. }

    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. 	led1_init();  //led初始化
    7. 	spi_init();  //蜂鸣器初始化
    8. 	fan_init();  //风扇初始化
    9. 	static int flag=0;
    10.     int irqno;//保存中断号
    11.     irqno=GICC->IAR & 0X3FF;
    12.     switch(irqno)
    13.     {
    14. 	case 99://key1
    15. 		//按键1中断处理
    16.  
    17. 		if(0==flag)
    18. 		{
    19. 			GPIOE->ODR |= (0x1<<10);
    20. 			flag=1;
    21. 		}
    22. 		else if(1==flag)
    23. 		{
    24. 			GPIOE->ODR &= (~(0x1<<10));
    25. 			flag=0;
    26. 		}
    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. 		if(0==flag)
    36. 		{
    37. 			GPIOB->ODR |= (0x1<<6);
    38. 			flag=1;
    39. 		}
    40. 		else if(1==flag)
    41. 		{
    42. 			GPIOB->ODR &= (~(0x1<<6));
    43. 			flag=0;
    44. 		}
    45.  
    46. 		//清除挂起中断标志位GICD_ICPENDRx
    47. 		GICD->ICPENDR[3] |= (0x1<<1);
    48. 		//清除中断触发标志位EXTI_FPR1
    49. 		EXTI->FPR1 |= (0x1<<7);
    50. 		break;
    51. 	case 98://key3
    52. 		//按键3中断处理
    53. 		
    54. 		if(0==flag)
    55. 		{
    56. 			GPIOE->ODR |= (0x1<<9);
    57. 			flag=1;
    58. 		}
    59. 		else if(1==flag)
    60. 		{
    61. 			GPIOE->ODR &= (~(0x1<<9));
    62. 			flag=0;
    63. 		}
    64.  
    65. 		//清除挂起中断标志位GICD_ICPENDRx
    66. 		GICD->ICPENDR[3] |= (0x1<<2);
    67. 		//清除中断触发标志位EXTI_FPR1
    68. 		EXTI->FPR1 |= (0x1<<8);
    69. 		break;
    70.     }
    71.     //清除处理完的中断号GICC_EOIR
    72.     GICC->EOIR =irqno;
    73. }

    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 key3_it_config();
    9. void delay1(int ms);
    10. void led1_init();
    11. void spi_init();
    12. void fan_init();
    13.  
    14. #endif

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  • 原文地址：https://blog.csdn.net/A18801772899/article/details/133799468