Code snippets for the Corona SDK Tutorial: Game controllers and axes (https://coronalabs.com/blog/2013/09/24/tutorial-controllers-and-axis)

part6.lua

-- Fetch all input devices currently connected to the system
local inputDevices = system.getInputDevices()

-- Traverse all input devices
for deviceIndex = 1, #inputDevices do

    -- Fetch the input device's axes
    print( deviceIndex, "andoridDeviceid", inputDevices[deviceIndex].androidDeviceId )
    print( deviceIndex, "canVibrate", inputDevices[deviceIndex].canVibrate )
    print( deviceIndex, "connectionState", inputDevices[deviceIndex].connectionState )
    print( deviceIndex, "descriptor", inputDevices[deviceIndex].descriptor )
    print( deviceIndex, "displayName", inputDevices[deviceIndex].displayName )
    print( deviceIndex, "isConnected", inputDevices[deviceIndex].isConnected )
    print( deviceIndex, "permenantid", tostring(inputDevices[deviceIndex].permanentId) )
    print( deviceIndex, "type", inputDevices[deviceIndex].type )

    -- OUYA may append the controller name to the end of the display name in a future update
    -- Future-proof this by looking at the first few characters and, if necessary, parse it

    local displayName = inputDevices[deviceIndex].displayName

    if ( string.sub(displayName,1,20) == "OUYA Game Controller" then
        displayName = string.sub( displayName,1,20 )
    end
    local descriptor = inputDevices[deviceIndex].descriptor
    local inputAxes = inputDevices[deviceIndex]:getAxes()

    -- Only look for Joysticks at the moment and map the controllers
    if ( inputDevices[deviceIndex].type == "joystick" ) then
        print( "We have a joystick; let's find some analog inputs!" )
        if ( #inputAxes > 0 ) then
            local controller = 0

            for axisIndex = 1, #inputAxes do
                if ( axisMap[displayName] and axisMap[displayName][axisIndex] ) then
                    axis[descriptor][axisMap[displayName][axisIndex]] = axisIndex
                    print( "mapped axis[" .. axisMap[displayName][axisIndex] .. "] to ", axisIndex )
                end
            end
        else
            -- Device does not have any axes!
            print( inputDevices[deviceIndex].descriptor .. ": No axes found." )
        end

    else
        print( "Not a Joystick" )
    end
end

-- Keys were handled in a previous blog post, but let's handle them to
-- demonstrate how some axis values map to key events

local function onKeyEvent( event )
   local phase = event.phase
   local keyName = event.keyName
   print( event.phase, event.keyName )
   local message = "Key '" .. event.keyName .. "' was pressed " .. event.phase
   myKeyDisplayText.text = message
   return false
end

Runtime:addEventListener( "key", onKeyEvent )