• C语言 cortex-A7核 按键中断 实验【重点】

    一、KEY1

    include/key.h

    1. #ifndef __KEY_H__
    2. #define __KEY_H__
    3.  
    4. #include "stm32mp1xx_rcc.h"
    5. #include "stm32mp1xx_gpio.h"
    6. #include "stm32mp1xx_exti.h"
    7. #include "stm32mp1xx_gic.h"
    8.  
    9. //RCC/GPIO章节初始化
    10. void hal_rcc_gpio_init();
    11.  
    12. //EXTI章节初始化 ---> KEY1
    13. void hal_exti_key1_init();
    14.  
    15. //GIC章节初始化 ---> KEY1
    16. void hal_gic_key1_init();
    17.  
    18. #endif

    src/key.c

    1. #include "key.h"
    2.  
    3. //KEY1 ---> PF9
    4. //KEY2 ---> PF7
    5. //KEY3 ---> PF8
    6.  
    7. //RCC/GPIO章节初始化
    8. void hal_rcc_gpio_init()
    9. {
    10. 	//RCC章节初始化 
    11. 	//1.使能GPIOF组控制器 MP_AHB4ENSETR[5] = 1
    12. 	RCC->MP_AHB4ENSETR |= (0X1 << 5);
    13. 	
    14. 	//GPIO章节初始化
    15. 	//1.使能PF9引脚为输入模式 MODER[19:18] = 00
    16. 	GPIOF->MODER &= (~(0X3 << 18));
    17. 	//2.使能PF7引脚为输入模式 MODER[15:14] = 00
    18. 	GPIOF->MODER &= (~(0x3 << 14));	
    19. 	//3.使能PF8引脚为输入模式 MODER[17:16] = 00
    20. 	GPIOF->MODER &= (~(0x3 << 16));
    21. }
    22.  
    23. //EXTI章节初始化 ---> KEY1
    24. void hal_exti_key1_init()
    25. {
    26. 	//1.设置EXTI中断选择寄存器 PF9 ---> EXTI9  EXTICR3[15:8]=0x05
    27. 	EXTI->EXTICR3 &= (0xff << 8);
    28. 	EXTI->EXTICR3 |= (0x05 << 8);
    29. 	//2.设置PF9引脚，中断触发方式为下降沿触发  FTSR1[9]=1
    30. 	EXTI->FTSR1 |= (0x1 << 9);
    31. 	//3.设置EXTI层中断不屏蔽 IMR1[9]=1
    32. 	EXTI->C1IMR1 |= (0x1 << 9);
    33. }
    34.  
    35. //GIC章节初始化 ---> KEY1
    36. void hal_gic_key1_init()
    37. {
    38. 	//GICD章节初始化
    39. 	//1.设置GICD层使能组0 CTRL[0] = 1
    40. 	GICD->CTRL |= (0x1 << 0);	
    41. 	//2.设置GICD层中断层使能 ISENABLER[3] 第3位写1
    42. 	GICD->ISENABLER[3] |= (0x1 << 3);
    43. 	//3.设置GICD层中断优先级寄存器 IPRIORITYR[24] 第[31:27] = 00000
    44. 	GICD->IPRIORITYR[24] &= (~(0x1f << 27));
    45. 	//4.设置GICD层中断目标分配寄存器  给CPU0 ITARGETSR[24] 第[25:24] = 01
    46. 	GICD->ITARGETSR[24] &= (~(0x1 << 25));
    47. 	GICD->ITARGETSR[24] |= (0x1 << 24);
    48.  
    49. 	//GICC章节初始化
    50. 	//1.使能GICC组0 CTLR[0] = 1
    51. 	GICC->CTRL |= (0x1 << 0);
    52. 	//2.设置KEY1 GICC层优先级 PMR[7:3] = 11111
    53. 	GICC->PMR |= (0x1f << 3);
    54. }

    src/do_irq.c

    1. #include "stm32mp1xx_exti.h"
    2. #include "stm32mp1xx_gic.h"
    3.  
    4. extern void printf(const char *fmt, ...);
    5.  
    6. void do_irq(void) 
    7. {
    8. 	unsigned int interrupt_id;
    9. 	//获取中断号
    10. 	interrupt_id = GICC->IAR & (0x3ff);
    11. 	switch(interrupt_id)
    12. 	{
    13. 	case 97:
    14. 		break;
    15. 	case 98:
    16. 		break;
    17. 	case 99:
    18. 		printf("key1 down!!!");
    19. 		printf("key1 ID = %d\n",interrupt_id);
    20. 		//清除EXTI层中断挂起标志位
    21. 		EXTI->FPR1 |= (0x1 << 9);
    22. 		//清除GICD层中断挂起标志位 ICPENDR[3] 第3位 = 1
    23. 		GICD->ICPENDR[3] |= (0x1 << 3);
    24. 		break;
    25. 	}
    26. 	//清除GICC中对应断号
    27. 	GICC->EOIR = interrupt_id; //将IAR寄存器中的中断号获取值，赋值给EOIR
    28. }

    main.c

    1. #include "key.h"
    2.  
    3. extern void printf(const char *fmt, ...);
    4.  
    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()
    14.  
    15. {
    16. 	hal_rcc_gpio_init(); //RCC/GPIO章节初始化
    17. 	hal_exti_key1_init(); //EXTI章节初始化
    18. 	hal_gic_key1_init(); //GIC章节初始化
    19. 	while(1)
    20.  
    21. 	{
    22.  
    23. 	}
    24. 	return 0;
    25. }

    二、封装函数

    include/key.h

    1. #ifndef __KEY_H__
    2. #define __KEY_H__
    3.  
    4. #include "stm32mp1xx_rcc.h"
    5. #include "led.h"
    6. #include "stm32mp1xx_exti.h"
    7. #include "stm32mp1xx_gic.h"
    8.  
    9. typedef enum{
    10. 	Falling, //下降沿
    11. 	Rising,  //上升沿
    12. }trigger_t;
    13.  
    14. //RCC/GPIO章节初始化
    15. void hal_rcc_gpio_init();
    16.  
    17. //void hal_exti_init(EXTI编号，GPIOF组号，触发方式);
    18. void hal_exti_init(unsigned int EXTI_INPUT,unsigned int GPIOxGroup,trigger_t event_trigger);
    19.  
    20. //void hal_gic_init(中断号，中断优先级);
    21. void hal_gic_init(unsigned int interrupt_id,unsigned int priority);
    22. #endif

    src/key.c

    1. #include "key.h"
    2.  
    3. //KEY1 ---> PF9
    4. //KEY2 ---> PF7
    5. //KEY3 ---> PF8
    6.  
    7. //RCC/GPIO章节初始化
    8. void hal_rcc_gpio_init()
    9. {
    10. 	//RCC章节初始化 
    11. 	//1.使能GPIOF组控制器 MP_AHB4ENSETR[5] = 1
    12. 	RCC->MP_AHB4ENSETR |= (0x1 << 5);
    13. 	//GPIO章节初始化
    14. 	//1.设置KEY1-->PF9引脚为输入模式 MODER[19:18] = 00
    15. 	GPIOF->MODER &= (~(0x3 << 18));
    16. 	//2.设置KEY2-->PF7引脚为输入模式 MODER[15:14] = 00
    17. 	GPIOF->MODER &= (~(0x3 << 14));
    18. 	//1.设置KEY3-->PF8引脚为输入模式 MODER[17:16] = 00
    19. 	GPIOF->MODER &= (~(0x3 << 16));
    20. }
    21.  
    22. //void hal_exti_init(EXTI编号，GPIOF组号，触发方式);
    23. void hal_exti_init(unsigned int EXTI_INPUT,unsigned int GPIOxGroup,trigger_t event_trigger)
    24. {
    25. 	//1.设置EXTI中断选择寄存器 PF9--->EXTI9 EXTICR3[15:8] = 0x05
    26. 	switch(EXTI_INPUT / 4)
    27. 	{
    28. 		case 0:
    29. 			break;
    30. 		case 1:
    31. 			EXTI->EXTICR2 &= (~(0xff << (EXTI_INPUT % 4 * 8)));
    32. 			EXTI->EXTICR2 |= (GPIOxGroup << (EXTI_INPUT % 4 * 8));
    33. 			break;
    34. 		case 2:
    35. 			EXTI->EXTICR3 &= (~(0xff << (EXTI_INPUT % 4 * 8)));
    36. 			EXTI->EXTICR3 |= (GPIOxGroup << (EXTI_INPUT % 4 * 8));
    37. 			break;
    38. 		case 3:
    39. 			break;
    40. 	}
    41. 	//2.设置中断触发方式
    42. 	if(event_trigger == Falling)
    43. 	{
    44. 		EXTI->FTSR1 |= (0x1 << EXTI_INPUT);
    45. 	}else
    46. 	{
    47. 		EXTI->RTSR1 |= (0x1 << EXTI_INPUT);
    48. 	}
    49. 	//3.设置EXTI层中断不屏蔽
    50. 	EXTI->C1IMR1 |= (0x1 << EXTI_INPUT);
    51. }
    52.  
    53. //void hal_gic_init(中断号，中断优先级);
    54. void hal_gic_init(unsigned int interrupt_id,unsigned int priority)
    55. {
    56. 	//GICD章节初始化 
    57. 	//1.设置GICD层使能组0 CTRL[0] = 1
    58. 	GICD->CTRL |= (0x1 << 0);
    59. 	//2.设置GICD层中断设置使能寄存器 
    60. 	GICD->ISENABLER[interrupt_id/32] |= (0x1 << (interrupt_id % 32));
    61. 	//3.设置GICD层中断优先级寄存器 
    62. 	GICD->IPRIORITYR[interrupt_id/4] &= (~(0x1f << (interrupt_id % 4 * 8 + 3)));
    63. 	GICD->IPRIORITYR[interrupt_id/4] |= (priority << (interrupt_id % 4 * 8 + 3));
    64. 	//4.设置GICD层中断目标分配寄存器 ITARGETSR[24] 第[25:24] = 01
    65. 	GICD->ITARGETSR[interrupt_id/4] &= (~(0x3 << (interrupt_id % 4 * 8)));
    66. 	GICD->ITARGETSR[interrupt_id/4] |= (0x1 << (interrupt_id % 4 * 8));
    67.  
    68. 	//GICC章节初始化
    69. 	//1.设置GICC层使能组0 CTRL[0] = 1
    70. 	GICC->CTRL |= (0x1 << 0);
    71. 	//2.设置GICC层中断优先级寄存器 PMR[7:3] = 11111
    72. 	GICC->PMR &= (~(0x1f << 3));
    73. 	GICC->PMR |= (0x1f << 3);
    74. }

    src/do_irq.c

    1. #include "stm32mp1xx_exti.h"
    2. #include "stm32mp1xx_gic.h"
    3. #include "led.h"
    4.  
    5. extern void printf(const char *fmt, ...);
    6.  
    7. void do_irq(void) 
    8. {
    9. 	unsigned int interrupt_id;
    10. 	//获取中断号 ID
    11. 	interrupt_id = GICC->IAR & (0x3ff);
    12. 	switch(interrupt_id)
    13. 	{
    14. 		case 97: //KEY2 ---> LED2 ---->PF10
    15. 			printf("key2 down!!!");
    16. 			printf("key2 ID = %d\n",interrupt_id);
    17. 			GPIOF->ODR ^= (0x1 << 10);
    18. 			//清除EXTI层中断挂起标志位 FPR1[7] = 1
    19. 			EXTI->FPR1 |= (0x1 << 7);
    20. 			//清除GICD层中断挂起标志位 ICPENDR[3]第一位写1
    21. 			GICD->ICPENDR[3] |= (0x1 << 1);
    22. 			break;
    23.  
    24. 		case 98: //KEY3 ---> LED1 ---->PE10
    25. 			printf("key3 down!!!");
    26. 			printf("key3 ID = %d\n",interrupt_id);
    27. 			GPIOE->ODR ^= (0x1 << 10);
    28. 			//清除EXTI层中断挂起标志位 FPR1[8] = 1
    29. 			EXTI->FPR1 |= (0x1 << 8);
    30. 			//清除GICD层中断挂起标志位 ICPENDR[3]第2位写1
    31. 			GICD->ICPENDR[3] |= (0x1 << 2);
    32. 			break;
    33. 		case 99: //KEY1 ---> LED3 ----> PE8
    34. 			printf("key1 down!!!");
    35. 			printf("key1 ID = %d\n",interrupt_id);
    36. 			GPIOE->ODR ^= (0x1 << 8);
    37. 			//清除EXTI层中断挂起标志位 FPR1[9] = 1
    38. 			EXTI->FPR1 |= (0x1 << 9);
    39. 			//清除GICD层中断挂起标志位 ICPENDR[3]第三位写1
    40. 			GICD->ICPENDR[3] |= (0x1 << 3);
    41. 			break;
    42. 	}
    43. 	//清除GICC层中断号 EOIR
    44. 	GICC->EOIR = interrupt_id;
    45. }

    main.c

    1. #include "led.h"
    2.  
    3. #include "key.h"
    4.  
    5.  
    6.  
    7. extern void printf(const char *fmt, ...);
    8.  
    9. void delay_ms(int ms)
    10.  
    11. {
    12.  
    13. 	int i,j;
    14.  
    15. 	for(i = 0; i < ms;i++)
    16.  
    17. 		for (j = 0; j < 1800; j++);
    18.  
    19. }
    20.  
    21.  
    22.  
    23. void led_init()
    24.  
    25. {
    26.  
    27. 	//GPIOE组/GPIOF组使能
    28.  
    29. 	RCC_MP_AHB4ENSETR |= (0x3 << 4);
    30.  
    31. 	//结构体初始化
    32.  
    33. 	gpio_init_t init = {OUTPUT,PP,LOW,NO_PU_PD};
    34.  
    35. 	hal_gpio_init(GPIOE,GPIO_PIN_10,&init);
    36.  
    37. 	hal_gpio_init(GPIOF,GPIO_PIN_10,&init);
    38.  
    39. 	hal_gpio_init(GPIOE,GPIO_PIN_8,&init);
    40.  
    41. }
    42.  
    43.  
    44.  
    45. int main()
    46.  
    47. {
    48.  
    49.  	led_init();// LED1灯初始化
    50.  
    51. 	//key1 ----> PF9 
    52.  
    53. 	hal_rcc_gpio_init();
    54.  
    55. 	hal_exti_init(9,0x05,Falling);
    56.  
    57. 	hal_gic_init(99,9);
    58.  
    59. 	//key2 ----> PF7 
    60.  
    61. 	hal_exti_init(7,0x05,Falling);
    62.  
    63. 	hal_gic_init(97,7);
    64.  
    65. 	//key3 ----> PF8
    66.  
    67. 	hal_exti_init(8,0x05,Falling);
    68.  
    69. 	hal_gic_init(98,8);
    70.  
    71. 	while(1)
    72.  
    73. 	{
    74.  
    75.  
    76.  
    77. 	}
    78.  
    79. 	return 0;
    80.  
    81. }

    调用：include/led.h

    1. #ifndef __LED_H__
    2. #define __LED_H__
    3.  
    4. //LED1 ---> PE10
    5. //LED2 ---> PF10
    6. //LED3 ---> PE8
    7.  
    8. //结构体封装
    9. typedef struct{
    10. 	volatile unsigned int MODER;  // 0x00
    11. 	volatile unsigned int OTYPER; // 0x04
    12. 	volatile unsigned int OSPEEDR; //0x08
    13. 	volatile unsigned int PUPDR; //0x0c
    14. 	volatile unsigned int IDR; //0x10
    15. 	volatile unsigned int ODR; //0x14
    16. }gpio_t;
    17.  
    18. //GPIOE组基地址 0x50006000
    19. #define GPIOE ((gpio_t*)0x50006000)
    20.  
    21. //GPIOF组基地址 0x50007000
    22. #define GPIOF ((gpio_t*)0x50007000)
    23.  
    24. #define RCC_MP_AHB4ENSETR (*(volatile unsigned int*)0x50000A28)
    25.  
    26. //引脚编号封装
    27. #define GPIO_PIN_0 0
    28. #define GPIO_PIN_1 1
    29. #define GPIO_PIN_2 2
    30. #define GPIO_PIN_3 3
    31. #define GPIO_PIN_4 4
    32. #define GPIO_PIN_5 5
    33. #define GPIO_PIN_6 6
    34. #define GPIO_PIN_7 7
    35. #define GPIO_PIN_8 8
    36. #define GPIO_PIN_9 9
    37. #define GPIO_PIN_10 10
    38. #define GPIO_PIN_11 11
    39. #define GPIO_PIN_12 12
    40. #define GPIO_PIN_13 13
    41. #define GPIO_PIN_14 14
    42. #define GPIO_PIN_15 15
    43.  
    44. //模式寄存器封装
    45. typedef enum{
    46. 	INPUT, //输入模式
    47. 	OUTPUT, //输出模式
    48. 	ALT, //复用功能模式
    49. 	ANALOG, //模拟模式
    50. }gpio_moder_t;
    51.  
    52. //输出类型寄存器封装
    53. typedef enum{
    54. 	PP,//推挽
    55. 	OD,//开漏
    56. }gpio_otyper_t;
    57.  
    58. //输出速率寄存器封装
    59. typedef enum{
    60. 	LOW,//低速
    61. 	MED,//中速
    62. 	HIGH,//高速
    63. 	VERY_HIGH,//快速
    64. }gpio_ospeedr_t;
    65.  
    66. //是否需要上下拉电阻进行封装
    67. typedef enum{
    68. 	NO_PU_PD,//禁止上下拉电阻
    69. 	PU,//上拉
    70. 	PD,//下拉
    71. }gpio_pupdr_t;
    72.  
    73. //封装初始化结构体
    74. typedef struct{
    75. 	gpio_moder_t moder; //模式相关寄存器
    76. 	gpio_otyper_t otyper;  //输出类型寄存器 
    77. 	gpio_ospeedr_t ospeedr; //输出速率寄存器 
    78. 	gpio_pupdr_t pupdr;   //是否需要上下拉电阻寄存器
    79. }gpio_init_t;
    80.  
    81. //输出高低电平
    82. typedef enum{
    83. 	GPIO_RESET_T,//低电平
    84. 	GPIO_SET_T,//高电平
    85. }gpio_status_t;
    86.  
    87. //函数功能:gpio相关初始化操作
    88. //参数1：GPIO组编号
    89. //参数2：GPIO引脚编号
    90. //参数3：初始化相关内容
    91. //返回值：无
    92. void hal_gpio_init(gpio_t* gpiox,unsigned int pin,gpio_init_t* init);
    93.  
    94.  
    95. //函数功能:gpio写相关操作
    96. //参数1：GPIO组编号
    97. //参数2：GPIO引脚编号
    98. //参数3：写值 写1高电平  写0低电平
    99. //返回值：无
    100. void hal_gpio_write(gpio_t* gpiox,unsigned int pin,gpio_status_t status);
    101.  
    102. #endif

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  • 原文地址：https://blog.csdn.net/Smallxu_/article/details/133274882