Dante API

The Dante API (DAPI) consists of two modules for communicating with a Dante device's GPIO interface from a Q-SYS Lua script.

Note: Initial Dante device support includes Audio-Technica microphones only. Other Dante devices that use the DAPI for GPIO might work but are not tested. This is a general interface and the actual usage of the GPIO on the device is specific to the device being controlled.

Creates a browser object that discovers Dante devices on the network. This is useful for knowing whether a device exists on the network.

Syntax

browser = DanteBrowser.New()

Property/Function

.Browse

This returned object can be assigned a callback function. This function is called when a device is added or removed from the network. It takes two arguments - the name of the device and the event type ( "ADDED","REMOVED" ) .

Note: DanteBrowser depends on the underlying Audinate library to provide this information. The REMOVED callback can take an indeterminate amount of time after a device is removed.

Creates an object that gives access to a specific device on the network. It allows the script to set the GPIO state of the device (for example, turn on LEDs) as well as receive GPIO events (for example, when a button is pressed on the device).

Syntax

device = DanteDevice.New(deviceName)

Property/Function

:SetGpio( value, mask )

Sets the GPIO state on the device. Value and mask are integers. Returns a numeric ID for the call.

:GetGpio()

Requests the current state of the GPIO. Returns a numeric ID for the call.

.Gpio

Function callback for when GPIO status changes on the device. Can take a single argument in the form of a table that contains details about the current state of the GPIO. The table contains:

  • .TriggerMask - bit mask of what changed
  • .InputMask - bit mask of pins set as input
  • .InputValue - value of pins set as inputs
  • .OutputMask - bit mask of pins set as output
  • .OutputValue - value of pins set as outputs

.Response

Function callback to determine if the set call succeeded. It takes two arguments: SetID and errorString. The latter will be nil if the call is successful.

Note: Even if no errorString is returned, this does not guarantee that the call made it to the device. However, the existence of an error string definitely means an error occurred.

In this example, we are communicating with an Audio-Technica microphone with these GPIO assignments:

This chart tells us that GPIO 0, 2, 3, 4, 5, 6 and 7 are configured as inputs (i.e., can be set high or low externally) and GPIO 1 is configured as an output (can be read / notified externally).

GPIO 0 is used to switch between LOCAL and REMOTE mode. In LOCAL mode, the mute button locally mutes the microphone audio as well as locally controls the LED when the button is pressed. To control the microphone remotely from Lua, we need to first switch it to REMOTE mode by setting GPIO 0 to 1. This is done by sending the GPIO with a value of 0x1 and a mask of 0x1. The value can be any value as long as the lowest bit is 1 since the device uses the mask to determine which GPIO channels to set or unset. The microphone should remembers this setting through a power cycle, but probably safest to always set them.

This example script synchronizes a local mute state button with the remote button and LED on the microphone.

Copy 
mic = "ATND8677-071142"
  
-- some defines for the bits
remoteMode = 0x1
button = 0x2
greenLED = 0x4
redLED = 0x8
  
browser = DanteBrowser.New()
timer = Timer.New()
device = nil
  
timer.EventHandler = function()
  if device then
    device:GetGpio()
  end
end
  
function dante_gpio(gpio)
  print("got gpio message")
  buttonWasPressed = gpio.TriggerMask & button == button
  buttonIsDown = gpio.InputValue & button == button
  if buttonWasPressed and buttonIsDown then
    Controls.mute.Boolean = not Controls.mute.Boolean
    updateLED()
  end
  Controls.led.Boolean = pressed
end
  
browser.Browse = function(name, br)
  print(string.format("Browse %s %s", name, br))
  if name == mic and br == "ADDED" then
    device = DanteDevice.New(name)
    device.Gpio = dante_gpio
  
    -- make sure mic is in remote mode
    device:SetGpio(remoteMode, remoteMode)
  
    device.Response = function(id, res)
      print("response : ", id, res)
    end
  
    -- every 10 seconds ask for the GPIO state
    -- this could be used along with another timer
    -- to determine if the device is alive on the network
    timer:Start(10)
  end
end
  
greenLED = 0x4
redLED = 0x8
  
function updateLED()
  Controls.mute.Legend = Controls.mute.Boolean and "MUTED" or "UNMUTED"
  if device then
    id = device:SetGpio(Controls.mute.Boolean and redLED or greenLED, greenLED | redLED)
  end
end
  
Controls.mute.EventHandler = function(ctl)
  updateLED()
end