Minecraft Redstone LCD Firmware

local i = 0
local data = false
local hold = false
local normal = "normal"
local reverse = "reverse"
local mode = ""

local function pulse(side, ticks)
    rs.setOutput(side, true)
    sleep(ticks / 10)
    rs.setOutput(side, false)
end


local function countNormal()
    pulse("left", 2)

    while true do
        data = rs.getInput("back")

        if data and not hold == true then
            pulse("left", 2)
            i = i + 1
            print(i)
        end
        hold = data

        if rs.getInput("right") == true then
            break
        end
        os.sleep(0.01)
    end
end


local function program()
    write("Select mode (normal, reverse): ")
    mode = read()

    if mode == normal then
        countNormal()
    elseif mode == reverse then
        rs.setOutput("bottom", true)
        countNormal()
        rs.setOutput("bottom", false)
    else
        print("Error: mode not allowed (" .. mode ..") , retry")
        os.sleep(2)
        term.clear()
        term.setCursorPos(1, 1)
        program()
    end
end

program()