• 按钮控制LED灯、蜂鸣器、风扇实验

    key_it.h

    1. #ifndef __KEY_IT_H__
    2. #define __KEY_IT_H__
    3.  
    4. #include "stm32mp1xx_rcc.h"
    5. #include "stm32mp1xx_gpio.h"
    6. #include "stm32mp1xx_exti.h"
    7. #include "stm32mp1xx_gic.h"
    8.  
    9. void key_it_config();
    10. #endif

    key_it.c

    1. #include "key_it.h"
    2.  
    3. void key_it_config(){
    4.     //RCC使能GPIOF时钟
    5.     RCC->MP_AHB4ENSETR  |= (0x1<<5);
    6.     //设置PF9 PF7 PF8设置为输入模式
    7.     GPIOF->MODER &= (~(0x3F<<14));
    8.     //设置PF9 PF7 PF8产生EXTI事件
    9.     EXTI->EXTICR3 &= (~(0xFF<<8));
    10.     EXTI->EXTICR3 |= (0x5<<8);
    11.     EXTI->EXTICR3 &= (~(0xFF));
    12.     EXTI->EXTICR3 |= (0x5);
    13.     EXTI->EXTICR2 &= (~(0xFF<<24));
    14.     EXTI->EXTICR2 |= (0x5<<24);
    15.     //设置事件触发方式为下降沿触发EXTI_FTSR1
    16.     EXTI->FTSR1 |= (0x7<<7);
    17.     //设置EXTI事件触发不屏蔽EXTI_IMR1
    18.     EXTI->C1IMR1 |= (0x7<<7);
    19.     //使能中断能转发到特定的CPU接口层GICD_ISENABLERx
    20.     GICD->ISENABLER[3] |= (0x7<<1);
    21.     //GICD_ISENABLERx设置中断优先级
    22.     //PF7
    23.     GICD->IPRIORITYR[24] &= (~(0X1F<<11)); 
    24.     //PF8
    25.     GICD->IPRIORITYR[24] &= (~(0X1F<<19)); 
    26.     //PF9
    27.     GICD->IPRIORITYR[24] &= (~(0X1F<<27)); 
    28.     //设置当前中断被转发到哪一个CPU处理GICD_ITARGETSRx
    29.     //pf7 97中断
    30.     GICD->ITARGETSR[24]  &= (~(0X3<<8));
    31.     GICD->ITARGETSR[24] |= (0X1<<8);
    32.     //pf8 98中断
    33.     GICD->ITARGETSR[24]  &= (~(0X3<<16));
    34.     GICD->ITARGETSR[24] |= (0X1<<16);
    35.     //pf9 99中断
    36.     GICD->ITARGETSR[24]  &= (~(0X3<<24));
    37.     GICD->ITARGETSR[24] |= (0X1<<24);
    38.     //使能组0转发中断GICD_CTLR
    39.     GICD->CTRL |= 0X1;
    40.     //设置中断优先级掩码GICC_PMR
    41.     GICC->PMR |= (0x1F<<3);
    42.  
    43.     //使能CPU可以处理组0转发的中断GICC_CTLR
    44.     GICC->CTRL |= 0X1;
    45. }

    led.h

    1. #ifndef __LED_H__
    2. #define __LED_H__
    3.  
    4. #include "stm32mp1xx_gpio.h"
    5. #include "stm32mp1xx_rcc.h"
    6.  
    7. void all_led_init();
    8. #endif

    led.c

    1. #include "led.h"
    2.  
    3. void all_led_init(){
    4.     //RCC使能
    5.     RCC->MP_AHB4ENSETR  |= (0x3<<4);
    6.     //设置PE10 PF10 PE8为输出
    7.     GPIOE->MODER &= (~(0X3<<20));
    8.     GPIOE->MODER |= (0X1<<20);
    9.     GPIOF->MODER &= (~(0X3<<20));
    10.     GPIOF->MODER |= (0X1<<20);
    11.     GPIOE->MODER &= (~(0X3<<16));
    12.     GPIOE->MODER |= (0X1<<16);
    13.     //设置推挽输出
    14.     GPIOE->OTYPER &= (~(0X1<<10));
    15.     GPIOF->OTYPER &= (~(0X1<<10));
    16.     GPIOE->OTYPER &= (~(0X1<<8));
    17.     //设置三个管脚低速输出
    18.     GPIOE->OSPEEDR &= (~(0X3<<20));
    19.     GPIOF->OSPEEDR &= (~(0X3<<20));
    20.     GPIOE->OSPEEDR&= (~(0X3<<16));
    21.     //设置三个管脚输出时无上拉电阻和下拉电阻    
    22.     GPIOE->PUPDR &= (~(0X3<<20));
    23.     GPIOF->PUPDR &= (~(0X3<<20));
    24.     GPIOE->PUPDR &= (~(0X3<<16));
    25. }

    sp.h

    1. #ifndef __SP_H__
    2. #define __SP_H__
    3.  
    4. #include "stm32mp1xx_gpio.h"
    5. #include "stm32mp1xx_rcc.h"
    6.  
    7. void sp_init();
    8. #endif

    sp.c

    1. #include "sp.h"
    2.  
    3. void sp_init(){
    4.     //RCC使能
    5.     RCC->MP_AHB4ENSETR  |= (0x1<<1);
    6.     //设置PE9为输出
    7.     GPIOB->MODER &= (~(0X3<<12));
    8.     GPIOB->MODER |= (0X1<<12);
    9.     //设置推挽输出
    10.     GPIOB->OTYPER &= (~(0X1<<6));
    11.     //设置三个管脚低速输出
    12.     GPIOB->OSPEEDR &= (~(0X3<<12));
    13.     //设置三个管脚输出时无上拉电阻和下拉电阻    
    14.     GPIOB->PUPDR &= (~(0X3<<12));
    15. }

    fan.h

    1. #ifndef __FAN_H__
    2. #define __FAN_H__
    3.  
    4. #include "stm32mp1xx_gpio.h"
    5. #include "stm32mp1xx_rcc.h"
    6.  
    7. void fan_init();
    8. #endif

    fan.c

    1. #include "fan.h"
    2.  
    3. void fan_init(){
    4.     //RCC使能
    5.     RCC->MP_AHB4ENSETR  |= (0x1<<4);
    6.     //设置PE9为输出
    7.     GPIOE->MODER &= (~(0X3<<18));
    8.     GPIOE->MODER |= (0X1<<18);
    9.     //设置推挽输出
    10.     GPIOE->OTYPER &= (~(0X1<<9));
    11.     //设置三个管脚低速输出
    12.     GPIOE->OSPEEDR &= (~(0X3<<18));
    13.     //设置三个管脚输出时无上拉电阻和下拉电阻    
    14.     GPIOE->PUPDR &= (~(0X3<<18));
    15. }

    do_irq.c

    1. #include "key_it.h"
    2. #include "led.h"
    3. #include "sp.h"
    4. #include "fan.h"
    5. extern void printf(const char *fmt, ...);
    6. unsigned int i = 0;
    7. void do_irq(void) 
    8. {
    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.             if(GPIOE->ODR & (1<<10)){
    16.                 GPIOE->ODR &= (~(1<<10));
    17.             }else{
    18.                 GPIOE->ODR |= (1<<10);
    19.             }
    20.             printf("KEY1 INT\n");
    21.     //清除挂起中断标志位GICD_ICPENDRx
    22.         GICD->ICPENDR[3] |= (0x1<<3);
    23.     //清除中断触发标志位EXTI_FPR1
    24.         EXTI->FPR1 |= (0x1<<9);
    25.             break;
    26.         case 97://key2
    27.             //按键2中断处理
    28.             if(GPIOB->ODR & (1<<6)){
    29.                 GPIOB->ODR &= (~(1<<6));
    30.             }else{
    31.                 GPIOB->ODR |= (1<<6);
    32.             }
    33.             printf("KEY2 INT\n");
    34.     //清除挂起中断标志位GICD_ICPENDRx
    35.     GICD->ICPENDR[3] |= (0x1<<1);
    36.     //清除中断触发标志位EXTI_FPR1
    37.     EXTI->FPR1 |= (0x1<<7);
    38.             break;
    39.         case 98://key3
    40.             //按键3中断处理
    41.            if(GPIOE->ODR & (1<<9)){
    42.                 GPIOE->ODR &= (~(1<<9));
    43.             }else{
    44.                 GPIOE->ODR |= (1<<9);
    45.             }
    46.             printf("KEY3 INT\n");
    47.     //清除挂起中断标志位GICD_ICPENDRx
    48.     GICD->ICPENDR[3] |= (0x1<<2);
    49.     //清除中断触发标志位EXTI_FPR1
    50.     EXTI->FPR1 |= (0x1<<8);
    51.             break;
    52.     }
    53.     //清除处理完的中断号GICC_EOIR
    54.     GICC->EOIR =irqno;
    55. }

    main.c

    1. #include "uart4.h"
    2. #include "key_it.h"
    3. #include "led.h"
    4. #include "sp.h"
    5. #include "fan.h"
    6.  
    7. int main()
    8. {
    9. 	uart4_init();
    10. 	key_it_config();
    11. 	all_led_init();
    12. 	sp_init();
    13. 	fan_init();
    14. 	while(1){
    15. 	}
    16. 	return 0;
    17.  
    18. }
    19.  
    20.  
    21.

    效果视频

    按钮控制LED灯、蜂鸣器、风扇实验

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  • 原文地址：https://blog.csdn.net/qq_53268516/article/details/133796915