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MultiButton

简介

MultiButton 是一个小巧简单易用的事件驱动型按键驱动模块,可无限量扩展按键,按键事件的回调异步处理方式可以简化你的程序结构,去除冗余的按键处理硬编码,让你的按键业务逻辑更清晰。

使用方法

1.先申请一个按键结构

structButtonbutton1;

2.初始化按键对象,绑定按键的GPIO电平读取接口read_button_pin() ,后一个参数设置有效触发电平

button_init(&button1, read_button_pin, 0, 0);

3.注册按键事件

button_attach(&button1, SINGLE_CLICK, Callback_SINGLE_CLICK_Handler);
button_attach(&button1, DOUBLE_CLICK, Callback_DOUBLE_Click_Handler);
...

4.启动按键

button_start(&button1);

5.设置一个5ms间隔的定时器循环调用后台处理函数

while(1) {
...
if(timer_ticks==5) {
timer_ticks=0;
button_ticks();
}
}

特性

MultiButton 使用C语言实现,基于面向对象方式设计思路,每个按键对象单独用一份数据结构管理:

structButton {
uint16_tticks;
uint8_trepeat: 4;
uint8_tevent : 4;
uint8_tstate : 3;
uint8_tdebounce_cnt : 3;
uint8_tactive_level : 1;
uint8_tbutton_level : 1;
uint8_tbutton_id;
uint8_t (*hal_button_Level)(uint8_tbutton_id_);
BtnCallbackcb[number_of_event];
structButton*next;
};

这样每个按键使用单向链表相连,依次进入 button_handler(struct Button* handle) 状态机处理,所以每个按键的状态彼此独立。

按键事件

事件说明
PRESS_DOWN按键按下,每次按下都触发
PRESS_UP按键弹起,每次松开都触发
PRESS_REPEAT重复按下触发,变量repeat计数连击次数
SINGLE_CLICK单击按键事件
DOUBLE_CLICK双击按键事件
LONG_PRESS_START达到长按时间阈值时触发一次
LONG_PRESS_HOLD长按期间一直触发

Examples

#include"button.h"unit8_tbtn1_id=0;
structButtonbtn1;
uint8_tread_button_GPIO(uint8_tbutton_id)
{
// you can share the GPIO read function with multiple Buttonsswitch(button_id)
{
casebtn1_id:
returnHAL_GPIO_ReadPin(B1_GPIO_Port, B1_Pin);
break;
default:
return0;
break;
}
}
voidBTN1_PRESS_DOWN_Handler(void*btn)
{
//do something...
}
voidBTN1_PRESS_UP_Handler(void*btn)
{
//do something...
}
...
intmain()
{
button_init(&btn1, read_button_GPIO, 0, btn1_id);
button_attach(&btn1, PRESS_DOWN, BTN1_PRESS_DOWN_Handler);
button_attach(&btn1, PRESS_UP, BTN1_PRESS_UP_Handler);
button_attach(&btn1, PRESS_REPEAT, BTN1_PRESS_REPEAT_Handler);
button_attach(&btn1, SINGLE_CLICK, BTN1_SINGLE_Click_Handler);
button_attach(&btn1, DOUBLE_CLICK, BTN1_DOUBLE_Click_Handler);
button_attach(&btn1, LONG_PRESS_START, BTN1_LONG_PRESS_START_Handler);
button_attach(&btn2, LONG_PRESS_HOLD, BTN1_LONG_PRESS_HOLD_Handler);
button_start(&btn1);
//make the timer invoking the button_ticks() interval 5ms.//This function is implemented by yourself.__timer_start(button_ticks, 0, 5);
while(1)
{}
}

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Button driver for embedded system

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