Air101-LCD扩展板按键源码

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最新推荐文章于 2024-12-10 14:59:36 发布

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本文链接：https://blog.youkuaiyun.com/Denuin/article/details/123598777

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嵌入式硬件

本文档介绍了一个名为keyscan.lua的Lua模块，用于处理Air101-LCD扩展板上的按键输入。该模块支持设置不同按键的回调函数，包括按键按下、释放和长按三种状态，并提供了初始化GPIO和定时扫描按键的功能，适用于ESP32-C3开发板。

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keyscan.lua

使用方法

本文整理了之前Air101-LCD扩展板按键的测试程序，写成模块方便以后直接拿来使用。

Air101-LCD扩展板按键测试程序_Denuin的博客-优快云博客_air101开发板

keyscan.lua

--- 模块功能：Air101-LCD扩展板按键程序
-- @module keyscan
-- @author Denuin
-- @release 2022.03.19
local keyscan = {}

local updateflag = 0
local laststate = 0
local holdcnt = 0

-- 默认：ESP32-C3 板子的gpio引脚号，可通过keyscan.gpio来修改
local pin_key_up = 8 -- LCD_UPKEY
local pin_key_down = 13 -- LCD_RKEY
local pin_key_left = 5 -- LCD_DWKEY
local pin_key_right = 9 -- LCD_LKEY
local pin_key_center = 4 -- LCD_CENTER

local pass_left_fun = nil
local pass_up_fun = nil
local pass_right_fun = nil
local pass_down_fun = nil
local pass_center_fun = nil

local release_left_fun = nil
local release_up_fun = nil
local release_right_fun = nil
local release_down_fun = nil
local release_center_fun = nil

local hold_left_fun = nil
local hold_up_fun = nil
local hold_right_fun = nil
local hold_down_fun = nil
local hold_center_fun = nil

local function key_pass_action(flag)
    if flag & 0x0001 == 0x0001 then
        if pass_up_fun ~= nil then pass_up_fun() end
    end
    if flag & 0x0002 == 0x0002 then
        if pass_down_fun ~= nil then pass_down_fun() end
    end
    if flag & 0x0004 == 0x0004 then
        if pass_left_fun ~= nil then pass_left_fun() end
    end
    if flag & 0x0008 == 0x0008 then
        if pass_right_fun ~= nil then pass_right_fun() end
    end
    if flag & 0x0010 == 0x0010 then
        if pass_center_fun ~= nil then pass_center_fun() end
    end
end

local function key_hold_action(flag)
    if flag & 0x0001 == 0x0001 then
        if hold_up_fun ~= nil then hold_up_fun() end
    end
    if flag & 0x0002 == 0x0002 then
        if hold_down_fun ~= nil then hold_down_fun() end
    end
    if flag & 0x0004 == 0x0004 then
        if hold_left_fun ~= nil then hold_left_fun() end
    end
    if flag & 0x0008 == 0x0008 then
        if hold_right_fun ~= nil then hold_right_fun() end
    end
    if flag & 0x0010 == 0x0010 then
        if hold_center_fun ~= nil then hold_center_fun() end
    end
end

local function key_release_action(flag)
    if flag & 0x0001 == 0x0001 then
        if release_up_fun ~= nil then release_up_fun() end
    end
    if flag & 0x0002 == 0x0002 then
        if release_down_fun ~= nil then release_down_fun() end
    end
    if flag & 0x0004 == 0x0004 then
        if release_left_fun ~= nil then release_left_fun() end
    end
    if flag & 0x0008 == 0x0008 then
        if release_right_fun ~= nil then release_right_fun() end
    end
    if flag & 0x0010 == 0x0010 then
        if release_center_fun ~= nil then release_center_fun() end
    end
end

function keyscan.gpio(pin_left, pin_up, pin_right, pin_down, pin_center)
    pin_key_up = pin_up
    pin_key_down = pin_down
    pin_key_left = pin_left
    pin_key_right = pin_right
    pin_key_center = pin_center
end

function keyscan.pass(...)
    local arg = {...}
    for i, v in ipairs(arg) do
        if i == 1 then pass_left_fun = v end
        if i == 2 then pass_up_fun = v end
        if i == 3 then pass_right_fun = v end
        if i == 4 then pass_down_fun = v end
        if i == 5 then pass_center_fun = v end
    end
end

function keyscan.release(...)
    local arg = {...}
    for i, v in ipairs(arg) do
        if i == 1 then release_left_fun = v end
        if i == 2 then release_up_fun = v end
        if i == 3 then release_right_fun = v end
        if i == 4 then release_down_fun = v end
        if i == 5 then release_center_fun = v end
    end
end

function keyscan.hold(...)
    local arg = {...}
    for i, v in ipairs(arg) do
        if i == 1 then hold_left_fun = v end
        if i == 2 then hold_up_fun = v end
        if i == 3 then hold_right_fun = v end
        if i == 4 then hold_down_fun = v end
        if i == 5 then hold_center_fun = v end
    end
end

function keyscan.setup()
    gpio.setup(pin_key_up, nil, gpio.PULLUP)
    gpio.setup(pin_key_down, nil, gpio.PULLUP)
    gpio.setup(pin_key_left, nil, gpio.PULLUP)
    gpio.setup(pin_key_right, nil, gpio.PULLUP)
    gpio.setup(pin_key_center, nil, gpio.PULLUP)
end

-- 20ms进行一次扫描
function keyscan.run()
    local state = 0

    if gpio.get(pin_key_up) == 0 then state = state | 0x0001 end
    if gpio.get(pin_key_down) == 0 then state = state | 0x0002 end
    if gpio.get(pin_key_left) == 0 then state = state | 0x0004 end
    if gpio.get(pin_key_right) == 0 then state = state | 0x0008 end
    if gpio.get(pin_key_center) == 0 then state = state | 0x0010 end

    if state == 0 then
        holdcnt = 0
        if laststate ~= 0 then
            key_release_action(laststate)
            laststate = 0
        end
    else
        if laststate == 0 then key_pass_action(state) end

        holdcnt = holdcnt + 1
        if holdcnt > 50 then holdcnt = 45 end

        -- 长按
        if state ~= laststate then holdcnt = 0 end
        if holdcnt == 49 then key_hold_action(state) end

        laststate = state
    end

end

return keyscan

使用方法

-- （其它代码略）

local keyscan = require("keyscan")

-- 引脚设置
-- 按键顺序：key_left, key_up, key_right, key_down, key_center
keyscan.gpio(5, 8, 9, 13, 4) -- ESP32-C3 板子的gpio引脚号
keyscan.setup() -- 初始化gpio引脚

-- 单击操作
-- 按键顺序：key_left, key_up, key_right, key_down, key_center
keyscan.pass(function() log.info("keyscan.pass", "left") end,
             function() log.info("keyscan.pass", "up") end,
             function() log.info("keyscan.pass", "right") end,
             function() log.info("keyscan.pass", "down") end,
             function() log.info("keyscan.pass", "center") end)

-- 松开操作
-- 按键顺序：key_left, key_up, key_right, key_down, key_center
keyscan.release(function() log.info("keyscan.release", "left") end,
                function() log.info("keyscan.release", "up") end,
                function() log.info("keyscan.release", "right") end,
                function() log.info("keyscan.release", "down") end,
                function() log.info("keyscan.release", "center") end)

-- 长按操作
-- 按键顺序：key_left, key_up, key_right, key_down, key_center
keyscan.hold(function() log.info("keyscan.hold", "left") end,
             function() log.info("keyscan.hold", "up") end,
             function() log.info("keyscan.hold", "right") end,
             function() log.info("keyscan.hold", "down") end,
             function() log.info("keyscan.hold", "center") end)

-- 按键扫描（20ms扫描一次）
sys.taskInit(function()
    while 1 do
        keyscan.run()
        sys.wait(20)
    end
end)


-- （其它代码略）

参考：

Air101-LCD扩展板按键测试程序_Denuin的博客-优快云博客_air101开发板

ESP32-C3开发环境（LuatOS）_Denuin的博客-优快云博客