key_init.h
#ifndef __KEY_INIT_H_#define __KEY_INIT_H_#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"void key_init();#endifkey_init.c
#include "key_init.h"void key_init(){/*** key1 引脚 PF9* key2 引脚 PF7* kry3 引脚 PF8*///使能PF时钟RCC->MP_AHB4ENSETR |= (0X1 << 5);//设置引脚模式位输入,00为输入GPIOF->MODER &= (~(0X3 << 18)); //key1GPIOF->MODER &= (~(0X3 << 14)); //key2GPIOF->MODER &= (~(0X3 << 16)); //key3/*** GPIO的外设的组别有A-K组，每一个GPIO组有16个引脚* 这16个引脚都有对应的EXIT管理：EXIT0-15* EXIT又是由 4 个 EXITCR管理（EXTICR 0-3）* EXTICR 0 ： EXTI 0-3* EXTICR 1 ： EXTI 4-7* EXTICR 2 ： EXTI 8-11* EXTICR 3 ： EXTI 12-15* key1 PE9->EXTI9->EXTICR3* key2 PE7->EXTI7->EXTICR2* key3 PE8->EXTI8->EXTICR3*///设置对应引脚得EXTI事件//清空EXTI->EXTICR3 &= (~(0XFF << 8)); //key1EXTI->EXTICR2 &= (~(0XFF << 24));//key2EXTI->EXTICR3 &= (~(0XFF << 0)); //key3//设置为PF外设触发EXTI->EXTICR3 |= (0X5 << 8); //key1EXTI->EXTICR2 |= (0X5 << 24);//key2EXTI->EXTICR3 |= (0X5 << 0); //key3//设置下降沿检测，也就是引脚电平下降时触发EXTI->FTSR1 |= (0X1 << 9); //key1EXTI->FTSR1 |= (0X1 << 7); //key2EXTI->FTSR1 |= (0X1 << 8); //key3//取消事件屏蔽EXTI->C1IMR1 |= (0X1 << 9); //key1EXTI->C1IMR1 |= (0X1 << 7); //key2EXTI->C1IMR1 |= (0X1 << 8); //key3/*** 一共有287个中断事件* 每个寄存器有32位，也就是有9个寄存器去管理* key1->EXTI9-> 99 -> 99/32=3余3 -> 第 3 个寄存器的第3位* key2->EXTI7-> 97 -> 99/32=3余1 -> 第 3 个寄存器的第1位* key3->EXTI8-> 98 -> 99/32=3余2 -> 第 3 个寄存器的第2位* *///全局使能对应中断号GICD->ISENABLER[3] |= (0X1 << 3); //key1GICD->ISENABLER[3] |= (0X1 << 1); //key2GICD->ISENABLER[3] |= (0X1 << 2); //key3/** * 一共有287个中断事件* 每个中断事件的优先级容量为5位，也就是说只有32个优先级* 但是每个寄存器只有32位，还要字节对齐，所以无法容纳足够 5个 中断事件，只能容纳 4个* 而且设置的字节偏移了 3 位，所以* key1->99-> 99/4=24余3 -> IPRIORITYR 24 的第 3 个* key1->97-> 97/4=24余1 -> IPRIORITYR 24 的第 1 个* key1->98-> 98/4=24余2 -> IPRIORITYR 24 的第 2 个* 将其设置为 0 就是最高优先级*///设置中断优先级GICD->IPRIORITYR[24] &= (~(0X1F << 27)); //key1GICD->IPRIORITYR[24] &= (~(0X1F << 11)); //key2GICD->IPRIORITYR[24] &= (~(0X1F << 19)); //key3/*** 一共287个中断事件* 每个寄存器只存放了4个事件，每 2 位对应一个事件，字节对齐，其偏移量位0* 01：处理器1处理事件* 10：处理器2处理事件* key1->99-> 99/4=24余3 -> IPRIORITYR 24 的第 3 个* key1->97-> 97/4=24余1 -> IPRIORITYR 24 的第 1 个* key1->98-> 98/4=24余2 -> IPRIORITYR 24 的第 2 个*///设置处理中断的处理器GICD->ITARGETSR[24] |= (0X1 << 24); //key1GICD->ITARGETSR[24] |= (0X1 << 8); //key2GICD->ITARGETSR[24] |= (0X1 << 16); //key3//允许中断可以被转发到核0中GICD->CTRL |= (0X1 << 0);//设置中断的优先级掩码为最低优先级//当优先级掩码比中断优先级底时，中断才能转发GICC->PMR |= (0X1F << 3);//允许优先级掩码中断转发到核0中GICC->CTRL |= (0X1 << 0);
}module.h
#ifndef __MODULE_H_#define __MODULE_H_#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h"typedef enum{LED_1,LED_2,LED_3
}Led_t;typedef enum{CMD_ON,CMD_OFF
}Cmd_t;void module_init();
void module_led_ctrl(Led_t led, Cmd_t cmd);
void module_fan_ctrl(Cmd_t cmd);
void module_motor_ctrl(Cmd_t cmd);
void module_buzzer_ctrl(Cmd_t cmd);#endifmodule.c
#include "module.h"void module_init(){//时钟使能RCC->MP_AHB4ENSETR |= (0X1 << 1); //PBRCC->MP_AHB4ENSETR |= (0X1 << 4); //PERCC->MP_AHB4ENSETR |= (0X1 << 5); //PF//模式选择//模式位复位GPIOE->MODER &= (~(0X3 << 20)); //LED1GPIOF->MODER &= (~(0X3 << 20)); //LED2GPIOE->MODER &= (~(0X3 << 16)); //LED3GPIOE->MODER &= (~(0X3 << 18)); //FANGPIOF->MODER &= (~(0X3 << 12)); //MOTORGPIOB->MODER &= (~(0X3 << 12)); //BUZZER//模式位置位GPIOE->MODER |= (0X1 << 20); //LED1GPIOF->MODER |= (0X1 << 20); //LED2GPIOE->MODER |= (0X1 << 16); //LED3GPIOE->MODER |= (0X1 << 18); //FANGPIOF->MODER |= (0X1 << 12); //MOTORGPIOB->MODER |= (0X1 << 12); //BUZZER//推挽输出设置GPIOE->OTYPER &= (~(0X3 << 10)); //LED1GPIOF->OTYPER &= (~(0X3 << 10)); //LED2GPIOE->OTYPER &= (~(0X3 << 8)); //LED3GPIOE->OTYPER &= (~(0X3 << 9)); //FANGPIOF->OTYPER &= (~(0X3 << 6)); //MOTORGPIOB->OTYPER &= (~(0X3 << 6)); //BUZZER//低速输出设置 GPIOE->OSPEEDR &= (~(0X3 << 20)); //LED1GPIOF->OSPEEDR &= (~(0X3 << 20)); //LED2GPIOE->OSPEEDR &= (~(0X3 << 16)); //LED3GPIOE->OSPEEDR &= (~(0X3 << 18)); //FANGPIOF->OSPEEDR &= (~(0X3 << 12)); //MOTORGPIOB->OSPEEDR &= (~(0X3 << 12)); //BUZZER//无上下拉电阻设置GPIOE->PUPDR &= (~(0X3 << 20)); //LED1GPIOF->PUPDR &= (~(0X3 << 20)); //LED2GPIOE->PUPDR &= (~(0X3 << 16)); //LED3GPIOE->PUPDR &= (~(0X3 << 18)); //FANGPIOF->PUPDR &= (~(0X3 << 12)); //MOTORGPIOB->PUPDR &= (~(0X3 << 12)); //BUZZER
}
//LED灯模组
void module_led_ctrl(Led_t led, Cmd_t cmd){switch(led){case LED_1:if(cmd == CMD_ON){GPIOE->ODR |= (0X1 << 10);}else if(cmd == CMD_OFF){GPIOE->ODR &= (~(0X1 << 10));}break;case LED_2:if(cmd == CMD_ON){GPIOF->ODR |= (0X1 << 10);}else if(cmd == CMD_OFF){GPIOF->ODR &= (~(0X1 << 10));}break;case LED_3:if(cmd == CMD_ON){GPIOE->ODR |= (0X1 << 8);}else if(cmd == CMD_OFF){GPIOE->ODR &= (~(0X1 << 8));}break;}
}
//风扇模组
void module_fan_ctrl(Cmd_t cmd){if(cmd == CMD_ON){GPIOE->ODR |= (0X1 << 9);}else if(cmd == CMD_OFF){GPIOE->ODR &= (~(0X1 << 9));}
}
//马达模组
void module_motor_ctrl(Cmd_t cmd){if(cmd == CMD_ON){GPIOF->ODR |= (0X1 << 6);}else if(cmd == CMD_OFF){GPIOF->ODR &= (~(0X1 << 6));}
}
//蜂鸣器模组
void module_buzzer_ctrl(Cmd_t cmd){if(cmd == CMD_ON){GPIOB->ODR |= (0X1 << 6);}else if(cmd == CMD_OFF){GPIOB->ODR &= (~(0X1 << 6));}
}main.c
#include "key_init.h"
#include "module.h"
#include "delay.h"extern void printf(const char *fmt, ...);
int main()
{key_init();// key1_init();// key2_init();// key3_init();module_init();module_led_ctrl(LED_1, CMD_ON);module_led_ctrl(LED_2, CMD_ON);module_led_ctrl(LED_3, CMD_ON);delay_ms(1000);module_led_ctrl(LED_1, CMD_OFF);module_led_ctrl(LED_2, CMD_OFF);module_led_ctrl(LED_3, CMD_OFF);printf("Init\n");while (1);return 0;
}
