edgetx-lua/mspWarn at main · Akceptor/edgetx-lua · GitHub

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protocol = assert(loadScript("protocols.lua"))()
radio = assert(loadScript("radios.lua"))().msp
assert(loadScript(protocol.mspTransport))()
assert(loadScript("MSP/common.lua"))()

-- =========================
-- CONFIG
-- =========================
local DEFAULT_TEXT = "https://www.youtube.com/@Akceptor"
local MSP_SET_OSD_CUSTOM_MSG = 237   -- dynamic text for analog OSD
local SET_TEXT_SWITCH = "se"
local SWITCH_THRESHOLD = 0
local TEXT_MAX_LENGTH = 32
local DISPLAY_LENGTH = 16
local SCROLL_INTERVAL = 100          -- 1 s assuming 100 Hz timer

-- =========================
-- STATE
-- =========================
local switchWasOn = false
local scrollIndex = 1
local lastScrollTime = 0
local configuredText = DEFAULT_TEXT
local textLength = #configuredText

-- =========================
-- UTILITIES
-- =========================
local function getScrollSegment()
    if textLength == 0 then return "" end
    local segment = string.sub(configuredText, scrollIndex, scrollIndex + DISPLAY_LENGTH - 1)
    if #segment < DISPLAY_LENGTH then
        segment = segment .. string.sub(configuredText, 1, DISPLAY_LENGTH - #segment)
    end
    return segment
end

-- Send MSP 237 (enable + text)
local function sendOsdMessage(text)
    local payload = {1}  -- first byte = enable flag
    for i = 1, TEXT_MAX_LENGTH do
        payload[#payload + 1] = string.byte(text, i) or 0
    end
    protocol.mspWrite(MSP_SET_OSD_CUSTOM_MSG, payload)
end

-- Optional: disable message (hide)
local function clearOsdMessage()
    protocol.mspWrite(MSP_SET_OSD_CUSTOM_MSG, {0})
end

-- =========================
-- LOGIC
-- =========================
local function handleSwitch(telemetryReady)
    if textLength == 0 then
        switchWasOn = false
        return
    end
    local switchValue = getValue(SET_TEXT_SWITCH)
    local switchOn = switchValue and (switchValue > SWITCH_THRESHOLD)
    local now = getTime()

    if telemetryReady and switchOn then
        if not switchWasOn then
            scrollIndex = 1
            lastScrollTime = now
            sendOsdMessage(getScrollSegment())
        elseif now - lastScrollTime >= SCROLL_INTERVAL then
            scrollIndex = (scrollIndex % textLength) + 1
            lastScrollTime = now
            sendOsdMessage(getScrollSegment())
        end
    elseif switchWasOn and not switchOn then
        clearOsdMessage()  -- hide when switch released
    end

    switchWasOn = telemetryReady and switchOn
end

local function updateLogic()
    local telemetryReady = getRSSI() > 0
    if telemetryReady then
        mspProcessTxQ()
    else
        switchWasOn = false
    end
    handleSwitch(telemetryReady)
end

local function run(event)
    updateLogic()
    return 0
end

local function background()
    updateLogic()
    return 0
end

local function init()
    switchWasOn = false
    scrollIndex = 1
    lastScrollTime = 0
end

return { run = run, background = background, init = init }