KISS.lua

local versionInfo = "KISS TLM v1.3.1"

local blnMenuMode = 0

-- mahTarget is used to set our target mah consumption and mahAlertPerc is used for division of alerts
local mahTarget = 1250
local mahAlertPerc = 10

-- OpenTX 2.0 - Percent Unit = 8 // OpenTx 2.1/2.2 - Percent Unit = 13
-- see: https://opentx.gitbooks.io/opentx-lua-reference-guide/content/general/playNumber.html
local percentUnit = 13

local lastMahAlert = 0

-- Fixes mahAlert not appearing after battery disconnect
local lastKnownMah = 0

----------------------------------------------------------------
-- Custom Functions
----------------------------------------------------------------
local function getTelemetryId(name)
    field = getFieldInfo(name)

    if getFieldInfo(name) then
        return field.id
    end

    return -1
end

local data = {}
data.fuelUsed = getTelemetryId("Fuel")
data.volts = getTelemetryId("VFAS")

-------------------------------------------------------------------------
-- Utilities
-------------------------------------------------------------------------
-- Rounding Function
local function round(val, decimal)
    local exp = decimal and 10 ^ decimal or 1

    return math.ceil(val * exp - 0.5) / exp
end

-- MahAlert and Logging of last Value Played
local function playMahPerc(percVal)
    playNumber(percVal, percentUnit)
    lastMahAlert = percVal -- Set our lastMahAlert
end

local function playCritical(percVal)
    playFile("batcrit.wav")
    lastMahAlert = percVal -- Set our lastMahAlert
end

local function playAlerts()
    percVal = 0
    curMah = getValue(data.fuelUsed)

    if curMah ~= 0 then
        percVal = round(((curMah / mahTarget) * 100), 0)

        if percVal ~= lastMahAlert then
            -- Alert the user we are in critical alert
            if percVal > 100 then
                playCritical(percVal)
            elseif percVal > 90 and percVal < 100 then
                playMahPerc(percVal)
            elseif percVal % mahAlertPerc == 0 then
                playMahPerc(percVal)
            end
        end
    end
end

local function drawAlerts()
    percVal = 0

    -- Added to fix mah reseting to Zero on battery disconnects
    tmpMah = getValue(data.fuelUsed)

    if tmpMah ~= 0 then
        lastKnownMah = tmpMah
    end

    tmpVolts = round(getValue(data.volts), 2)

    -- The display of MAH data is now pulled from the lastKnownMah var which will only
    -- be reset on Telemetry reset now.
    percVal = round(((lastKnownMah / mahTarget) * 100), 0)
    lcd.drawText(5, 10, "USED: " .. lastKnownMah .. "mah", MIDSIZE)
    lcd.drawText(90, 30, percVal .. " %", MIDSIZE)
    lcd.drawText(150, 25, tmpVolts .. " V", MIDSIZE)
end

local function doMahAlert()
    playAlerts()
    drawAlerts()
end

local function draw()
    drawAlerts()
end

----------------------------------------------------------------
--
----------------------------------------------------------------
local function init_func()
    doMahAlert()
end

----------------------------------------------------------------
-- Should handle any flow needed when the screen is NOT visible
----------------------------------------------------------------
local function bg_func()
    playAlerts()
end

----------------------------------------------------------------
-- Should handle any flow needed when the screen is visible
-- All screen updating should be done by as little (one) function
-- outside of this run_func
----------------------------------------------------------------
local function run_func(event)
    if blnMenuMode == 1 then
        --We are in our menu mode
        if event == 32 then
            --Take us out of menu mode
            blnMenuMode = 0
        end

        -- Respond to user KeyPresses for mahSetup
        if event == EVT_PLUS_FIRST then
            mahAlertPerc = mahAlertPerc + 1
        end

        -- Long Presses
        if event == 68 then
            mahAlertPerc = mahAlertPerc + 1
        end

        if event == EVT_MINUS_FIRST then
            mahAlertPerc = mahAlertPerc - 1
        end

        -- Long Presses
        if event == 69 then
            mahAlertPerc = mahAlertPerc - 1
        end

        lcd.clear()

        lcd.drawScreenTitle(versionInfo, 2, 2)
        lcd.drawText(35, 10, "Set Percentage Notification")
        lcd.drawText(70, 20, "Every " .. mahAlertPerc .. " %", MIDSIZE)
        lcd.drawText(66, 35, "Use +/- to change", SMLSIZE)

        lcd.drawText(60, 55, "Press [MENU] to return", SMLSIZE)
    else
        if event == 32 then
            --Put us in menu mode
            blnMenuMode = 1
        end

        -- Respond to user KeyPresses for mahSetup
        if event == EVT_PLUS_FIRST then
            mahTarget = mahTarget + 50
        end

        if event == 68 then
            mahTarget = mahTarget + 50
        end

        if event == EVT_MINUS_FIRST then
            mahTarget = mahTarget - 50
        end

        if event == 69 then
            mahTarget = mahTarget - 50
        end

        --Update our screen
        lcd.clear()

        lcd.drawScreenTitle(versionInfo, 1, 2)

        lcd.drawGauge(6, 25, 70, 20, percVal, 100)
        lcd.drawText(130, 10, "Target mAh : ", MIDSIZE)
        lcd.drawText(160, 25, mahTarget, MIDSIZE)
        lcd.drawText(130, 40, "Use +/- to change", SMLSIZE)

        lcd.drawText(30, 55, "Press [MENU] for more options", SMLSIZE)

        draw()
        doMahAlert()
    end
end

return { run = run_func, background = bg_func, init = init_func }