`STM32` | `GPIO`输入之 按键检测

STM32 | GPIO输入之 按键检测

时间：2023-03-19

文章目录

• `STM32` | `GPIO`输入之 按键检测

• 1.硬件设计
• 2.代码编写

• 2-1.新建文件
• 2-2.编码

1.硬件设计

按键按下，GPIO输入为高电平；

2.代码编写

1. 使能GPIO端口时钟；
2. 初始化GPIO目标引脚为输入模式(浮空输入)；
3. 编写简单测试程序，检测按键的状态，实现按键控制LED灯。

2-1.新建文件

flyer@ThinkPad-FLY MINGW64 /d/05_study/STM32/stm32-f103rct6-mini-prj/code/02-FWLib_LED/User (master)
$ mkdir Key

flyer@ThinkPad-FLY MINGW64 /d/05_study/STM32/stm32-f103rct6-mini-prj/code/02-FWLib_LED/User (master)
$ cd Key/

flyer@ThinkPad-FLY MINGW64 /d/05_study/STM32/stm32-f103rct6-mini-prj/code/02-FWLib_LED/User/Key (master)
$ vim bsp_key.c

flyer@ThinkPad-FLY MINGW64 /d/05_study/STM32/stm32-f103rct6-mini-prj/code/02-FWLib_LED/User/Key (master)
$ cp bsp_key.c bsp_key.h

flyer@ThinkPad-FLY MINGW64 /d/05_study/STM32/stm32-f103rct6-mini-prj/code/02-FWLib_LED/User/Key (master)
$ vim bsp_key.h

flyer@ThinkPad-FLY MINGW64 /d/05_study/STM32/stm32-f103rct6-mini-prj/code/02-FWLib_LED/User/Key (master)
$ ls
bsp_key.c  bsp_key.h

2-2.编码

stm32-f103rct6-mini-prj\code\02-FWLib_LED\User\Key\bsp_key.h

/*******************************************************************
 *   > File Name: bsp_key.h
 *   > Create Time: Sun Mar 19 19:45:51 2023
 ******************************************************************/
#ifndef __BSP_KEY_H__
#define __BSP_KEY_H__

#include "stm32f10x.h"

#define KEY_ON  1
#define KEY_OFF 0

#define    KEY1_GPIO_CLK    RCC_APB2Periph_GPIOA
#define    KEY1_GPIO_PORT   GPIOA
#define    KEY1_GPIO_PIN    GPIO_Pin_0

#define    KEY2_GPIO_CLK    RCC_APB2Periph_GPIOC
#define    KEY2_GPIO_PORT   GPIOC
#define    KEY2_GPIO_PIN    GPIO_Pin_13

extern void Key_GPIO_Config(void);
extern uint8_t Key_Scan(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin);

#endif

stm32-f103rct6-mini-prj\code\02-FWLib_LED\User\Key\bsp_key.c

/*******************************************************************
 *   > File Name: bsp_key.c
 *   > Create Time: Sun Mar 19 19:45:51 2023
 ******************************************************************/
#include "bsp_key.h"

void Key_GPIO_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(KEY1_GPIO_CLK|KEY2_GPIO_CLK,ENABLE);

    GPIO_InitStructure.GPIO_Pin = KEY1_GPIO_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(KEY1_GPIO_PORT, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = KEY2_GPIO_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(KEY2_GPIO_PORT, &GPIO_InitStructure);
}

uint8_t Key_Scan(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
{
    if(GPIO_ReadInputDataBit(GPIOx,  GPIO_Pin) == KEY_ON){
        while(GPIO_ReadInputDataBit(GPIOx,  GPIO_Pin) == KEY_ON);
        return KEY_ON;
    }
    else
        return KEY_OFF;
}

stm32-f103rct6-mini-prj\code\02-FWLib_LED\User\main.c

/*******************************************************************
 *   > File Name: main.c
 *   > Create Time: Sun Mar 19 15:37:45 2023
 ******************************************************************/

#include "stm32f10x.h"
#include "bsp_led.h"
#include "bsp_key.h"

#define SOFT_DELAY  Delay(0xFFFFF);

void Delay(__IO uint32_t nCount)
{
    for(;nCount != 0; nCount --);
}

void tester_led(void)
{
    LED1(ON);
    SOFT_DELAY;
    LED1(OFF);

    LED2(ON);
    SOFT_DELAY;
    LED2(OFF);
}

void tester_key(void)
{
    if(Key_Scan(KEY1_GPIO_PORT, KEY1_GPIO_PIN) == KEY_ON){
        LED1_Toggle();
    }

    if(Key_Scan(KEY2_GPIO_PORT, KEY2_GPIO_PIN) == KEY_ON){
        LED2_Toggle();
    }
}

int main(void)
{
    LED_GPIO_Config();
    Key_GPIO_Config();

    while(1){
        tester_key();
    }

    return 0;
}

stm32-f103rct6-mini-prj\code\02-FWLib_LED\User\Led\bsp_led.c

void LED1_Toggle(void)
{
    static char isLedOn = 0;

    if(isLedOn == 0){
        LED1(ON);
        isLedOn = 1;
    }else{
        LED1(OFF);
        isLedOn = 0;
    }
}

void LED2_Toggle(void)
{
    static char isLedOn = 0;

    if(isLedOn == 0){
        LED2(ON);
        isLedOn = 1;
    }else{
        LED2(OFF);
        isLedOn = 0;
    }
}

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