一、KEY1
include/key.h
#ifndef __KEY_H__
#define __KEY_H__
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"
//RCC/GPIO章节初始化
void hal_rcc_gpio_init();
//EXTI章节初始化 ---> KEY1
void hal_exti_key1_init();
//GIC章节初始化 ---> KEY1
void hal_gic_key1_init();
#endif
src/key.c
#include "key.h"
//KEY1 ---> PF9
//KEY2 ---> PF7
//KEY3 ---> PF8
//RCC/GPIO章节初始化
void hal_rcc_gpio_init()
{
//RCC章节初始化
//1.使能GPIOF组控制器 MP_AHB4ENSETR[5] = 1
RCC->MP_AHB4ENSETR |= (0X1 << 5);
//GPIO章节初始化
//1.使能PF9引脚为输入模式 MODER[19:18] = 00
GPIOF->MODER &= (~(0X3 << 18));
//2.使能PF7引脚为输入模式 MODER[15:14] = 00
GPIOF->MODER &= (~(0x3 << 14));
//3.使能PF8引脚为输入模式 MODER[17:16] = 00
GPIOF->MODER &= (~(0x3 << 16));
}
//EXTI章节初始化 ---> KEY1
void hal_exti_key1_init()
{
//1.设置EXTI中断选择寄存器 PF9 ---> EXTI9 EXTICR3[15:8]=0x05
EXTI->EXTICR3 &= (0xff << 8);
EXTI->EXTICR3 |= (0x05 << 8);
//2.设置PF9引脚，中断触发方式为下降沿触发 FTSR1[9]=1
EXTI->FTSR1 |= (0x1 << 9);
//3.设置EXTI层中断不屏蔽 IMR1[9]=1
EXTI->C1IMR1 |= (0x1 << 9);
}
//GIC章节初始化 ---> KEY1
void hal_gic_key1_init()
{
//GICD章节初始化
//1.设置GICD层使能组0 CTRL[0] = 1
GICD->CTRL |= (0x1 << 0);
//2.设置GICD层中断层使能 ISENABLER[3] 第3位写1
GICD->ISENABLER[3] |= (0x1 << 3);
//3.设置GICD层中断优先级寄存器 IPRIORITYR[24] 第[31:27] = 00000
GICD->IPRIORITYR[24] &= (~(0x1f << 27));
//4.设置GICD层中断目标分配寄存器 给CPU0 ITARGETSR[24] 第[25:24] = 01
GICD->ITARGETSR[24] &= (~(0x1 << 25));
GICD->ITARGETSR[24] |= (0x1 << 24);
//GICC章节初始化
//1.使能GICC组0 CTLR[0] = 1
GICC->CTRL |= (0x1 << 0);
//2.设置KEY1 GICC层优先级 PMR[7:3] = 11111
GICC->PMR |= (0x1f << 3);
}
src/do_irq.c
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"
extern void printf(const char *fmt, ...);
void do_irq(void)
{
unsigned int interrupt_id;
//获取中断号
interrupt_id = GICC->IAR & (0x3ff);
switch(interrupt_id)
{
case 97:
break;
case 98:
break;
case 99:
printf("key1 down!!!");
printf("key1 ID = %d\n",interrupt_id);
//清除EXTI层中断挂起标志位
EXTI->FPR1 |= (0x1 << 9);
//清除GICD层中断挂起标志位 ICPENDR[3] 第3位 = 1
GICD->ICPENDR[3] |= (0x1 << 3);
break;
}
//清除GICC中对应断号
GICC->EOIR = interrupt_id; //将IAR寄存器中的中断号获取值，赋值给EOIR
}
main.c
#include "key.h"
extern void printf(const char *fmt, ...);
void delay_ms(int ms)
{
int i,j;
for(i = 0; i < ms;i++)
for (j = 0; j < 1800; j++);
}
int main()
{
hal_rcc_gpio_init(); //RCC/GPIO章节初始化
hal_exti_key1_init(); //EXTI章节初始化
hal_gic_key1_init(); //GIC章节初始化
while(1)
{
}
return 0;
}
二、封装函数
include/key.h
#ifndef __KEY_H__
#define __KEY_H__
#include "stm32mp1xx_rcc.h"
#include "led.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"
typedef enum{
Falling, //下降沿
Rising, //上升沿
}trigger_t;
//RCC/GPIO章节初始化
void hal_rcc_gpio_init();
//void hal_exti_init(EXTI编号，GPIOF组号，触发方式);
void hal_exti_init(unsigned int EXTI_INPUT,unsigned int GPIOxGroup,trigger_t event_trigger);
//void hal_gic_init(中断号，中断优先级);
void hal_gic_init(unsigned int interrupt_id,unsigned int priority);
#endif
src/key.c
#include "key.h"
//KEY1 ---> PF9
//KEY2 ---> PF7
//KEY3 ---> PF8
//RCC/GPIO章节初始化
void hal_rcc_gpio_init()
{
//RCC章节初始化
//1.使能GPIOF组控制器 MP_AHB4ENSETR[5] = 1
RCC->MP_AHB4ENSETR |= (0x1 << 5);
//GPIO章节初始化
//1.设置KEY1-->PF9引脚为输入模式 MODER[19:18] = 00
GPIOF->MODER &= (~(0x3 << 18));
//2.设置KEY2-->PF7引脚为输入模式 MODER[15:14] = 00
GPIOF->MODER &= (~(0x3 << 14));
//1.设置KEY3-->PF8引脚为输入模式 MODER[17:16] = 00
GPIOF->MODER &= (~(0x3 << 16));
}
//void hal_exti_init(EXTI编号，GPIOF组号，触发方式);
void hal_exti_init(unsigned int EXTI_INPUT,unsigned int GPIOxGroup,trigger_t event_trigger)
{
//1.设置EXTI中断选择寄存器 PF9--->EXTI9 EXTICR3[15:8] = 0x05
switch(EXTI_INPUT / 4)
{
case 0:
break;
case 1:
EXTI->EXTICR2 &= (~(0xff << (EXTI_INPUT % 4 * 8)));
EXTI->EXTICR2 |= (GPIOxGroup << (EXTI_INPUT % 4 * 8));
break;
case 2:
EXTI->EXTICR3 &= (~(0xff << (EXTI_INPUT % 4 * 8)));
EXTI->EXTICR3 |= (GPIOxGroup << (EXTI_INPUT % 4 * 8));
break;
case 3:
break;
}
//2.设置中断触发方式
if(event_trigger == Falling)
{
EXTI->FTSR1 |= (0x1 << EXTI_INPUT);
}else
{
EXTI->RTSR1 |= (0x1 << EXTI_INPUT);
}
//3.设置EXTI层中断不屏蔽
EXTI->C1IMR1 |= (0x1 << EXTI_INPUT);
}
//void hal_gic_init(中断号，中断优先级);
void hal_gic_init(unsigned int interrupt_id,unsigned int priority)
{
//GICD章节初始化
//1.设置GICD层使能组0 CTRL[0] = 1
GICD->CTRL |= (0x1 << 0);
//2.设置GICD层中断设置使能寄存器
GICD->ISENABLER[interrupt_id/32] |= (0x1 << (interrupt_id % 32));
//3.设置GICD层中断优先级寄存器
GICD->IPRIORITYR[interrupt_id/4] &= (~(0x1f << (interrupt_id % 4 * 8 + 3)));
GICD->IPRIORITYR[interrupt_id/4] |= (priority << (interrupt_id % 4 * 8 + 3));
//4.设置GICD层中断目标分配寄存器 ITARGETSR[24] 第[25:24] = 01
GICD->ITARGETSR[interrupt_id/4] &= (~(0x3 << (interrupt_id % 4 * 8)));
GICD->ITARGETSR[interrupt_id/4] |= (0x1 << (interrupt_id % 4 * 8));
//GICC章节初始化
//1.设置GICC层使能组0 CTRL[0] = 1
GICC->CTRL |= (0x1 << 0);
//2.设置GICC层中断优先级寄存器 PMR[7:3] = 11111
GICC->PMR &= (~(0x1f << 3));
GICC->PMR |= (0x1f << 3);
}
src/do_irq.c
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"
#include "led.h"
extern void printf(const char *fmt, ...);
void do_irq(void)
{
unsigned int interrupt_id;
//获取中断号 ID
interrupt_id = GICC->IAR & (0x3ff);
switch(interrupt_id)
{
case 97: //KEY2 ---> LED2 ---->PF10
printf("key2 down!!!");
printf("key2 ID = %d\n",interrupt_id);
GPIOF->ODR ^= (0x1 << 10);
//清除EXTI层中断挂起标志位 FPR1[7] = 1
EXTI->FPR1 |= (0x1 << 7);
//清除GICD层中断挂起标志位 ICPENDR[3]第一位写1
GICD->ICPENDR[3] |= (0x1 << 1);
break;
case 98: //KEY3 ---> LED1 ---->PE10
printf("key3 down!!!");
printf("key3 ID = %d\n",interrupt_id);
GPIOE->ODR ^= (0x1 << 10);
//清除EXTI层中断挂起标志位 FPR1[8] = 1
EXTI->FPR1 |= (0x1 << 8);
//清除GICD层中断挂起标志位 ICPENDR[3]第2位写1
GICD->ICPENDR[3] |= (0x1 << 2);
break;
case 99: //KEY1 ---> LED3 ----> PE8
printf("key1 down!!!");
printf("key1 ID = %d\n",interrupt_id);
GPIOE->ODR ^= (0x1 << 8);
//清除EXTI层中断挂起标志位 FPR1[9] = 1
EXTI->FPR1 |= (0x1 << 9);
//清除GICD层中断挂起标志位 ICPENDR[3]第三位写1
GICD->ICPENDR[3] |= (0x1 << 3);
break;
}
//清除GICC层中断号 EOIR
GICC->EOIR = interrupt_id;
}
main.c
#include "led.h"
#include "key.h"
extern void printf(const char *fmt, ...);
void delay_ms(int ms)
{
int i,j;
for(i = 0; i < ms;i++)
for (j = 0; j < 1800; j++);
}
void led_init()
{
//GPIOE组/GPIOF组使能
RCC_MP_AHB4ENSETR |= (0x3 << 4);
//结构体初始化
gpio_init_t init = {OUTPUT,PP,LOW,NO_PU_PD};
hal_gpio_init(GPIOE,GPIO_PIN_10,&init);
hal_gpio_init(GPIOF,GPIO_PIN_10,&init);
hal_gpio_init(GPIOE,GPIO_PIN_8,&init);
}
int main()
{
led_init();// LED1灯初始化
//key1 ----> PF9
hal_rcc_gpio_init();
hal_exti_init(9,0x05,Falling);
hal_gic_init(99,9);
//key2 ----> PF7
hal_exti_init(7,0x05,Falling);
hal_gic_init(97,7);
//key3 ----> PF8
hal_exti_init(8,0x05,Falling);
hal_gic_init(98,8);
while(1)
{
}
return 0;
}
调用：include/led.h
#ifndef __LED_H__
#define __LED_H__
//LED1 ---> PE10
//LED2 ---> PF10
//LED3 ---> PE8
//结构体封装
typedef struct{
volatile unsigned int MODER; // 0x00
volatile unsigned int OTYPER; // 0x04
volatile unsigned int OSPEEDR; //0x08
volatile unsigned int PUPDR; //0x0c
volatile unsigned int IDR; //0x10
volatile unsigned int ODR; //0x14
}gpio_t;
//GPIOE组基地址 0x50006000
#define GPIOE ((gpio_t*)0x50006000)
//GPIOF组基地址 0x50007000
#define GPIOF ((gpio_t*)0x50007000)
#define RCC_MP_AHB4ENSETR (*(volatile unsigned int*)0x50000A28)
//引脚编号封装
#define GPIO_PIN_0 0
#define GPIO_PIN_1 1
#define GPIO_PIN_2 2
#define GPIO_PIN_3 3
#define GPIO_PIN_4 4
#define GPIO_PIN_5 5
#define GPIO_PIN_6 6
#define GPIO_PIN_7 7
#define GPIO_PIN_8 8
#define GPIO_PIN_9 9
#define GPIO_PIN_10 10
#define GPIO_PIN_11 11
#define GPIO_PIN_12 12
#define GPIO_PIN_13 13
#define GPIO_PIN_14 14
#define GPIO_PIN_15 15
//模式寄存器封装
typedef enum{
INPUT, //输入模式
OUTPUT, //输出模式
ALT, //复用功能模式
ANALOG, //模拟模式
}gpio_moder_t;
//输出类型寄存器封装
typedef enum{
PP,//推挽
OD,//开漏
}gpio_otyper_t;
//输出速率寄存器封装
typedef enum{
LOW,//低速
MED,//中速
HIGH,//高速
VERY_HIGH,//快速
}gpio_ospeedr_t;
//是否需要上下拉电阻进行封装
typedef enum{
NO_PU_PD,//禁止上下拉电阻
PU,//上拉
PD,//下拉
}gpio_pupdr_t;
//封装初始化结构体
typedef struct{
gpio_moder_t moder; //模式相关寄存器
gpio_otyper_t otyper; //输出类型寄存器
gpio_ospeedr_t ospeedr; //输出速率寄存器
gpio_pupdr_t pupdr; //是否需要上下拉电阻寄存器
}gpio_init_t;
//输出高低电平
typedef enum{
GPIO_RESET_T,//低电平
GPIO_SET_T,//高电平
}gpio_status_t;
//函数功能:gpio相关初始化操作
//参数1：GPIO组编号
//参数2：GPIO引脚编号
//参数3：初始化相关内容
//返回值：无
void hal_gpio_init(gpio_t* gpiox,unsigned int pin,gpio_init_t* init);
//函数功能:gpio写相关操作
//参数1：GPIO组编号
//参数2：GPIO引脚编号
//参数3：写值 写1高电平 写0低电平
//返回值：无
void hal_gpio_write(gpio_t* gpiox,unsigned int pin,gpio_status_t status);
#endif
