class DisplayData – Display Data

The DisplayData class is used for getting information about the attached DisplayPort/HDMI Display.

Constructors

display.DisplayData

class display.DisplayData(cec=False, ddc=False, ddc_addr=0x50)

cec Pass True to enable CEC communication to an external display (if possible).

ddc Pass True to enable DDC communication to an external display (if possible).

ddc_addr The I2C address to use to talk to the external display EEPROM.

Methods

display.DisplayData.display_id

display.DisplayData.display_id() -> int

Returns the external display EDID data as a bytes() object. Verifying the EDID headers, checksums, and concatenating all sections into one bytes() object is done for you. You may then parse this information by following this guide.

DisplayData.send_frame

DisplayData.send_frame(dst_addr, src_addr, bytes)

Sends a packet on the HDMI-CEC bus to dst_addr with source src_addr and data bytes.

DisplayData.receive_frame

DisplayData.receive_frame(dst_addr, timeout=1000)

Waits timeout milliseconds to receive an HDMI-CEC frame for address dst_addr. Returns True if the received frame was for dst_addr and False if not. On timeout throws an OSError Exception.

DisplayData.frame_callback

DisplayData.frame_callback(callback, dst_addr)

Registers a callback which will be called on reception of an HDMI-CEC frame. The callback will receive two arguments of the frame src_addr as an int and payload as a bytes() object.

dst_addr sets the filter address to listen to on the CEC bus.

If you use this method do not call DisplayData.receive_frame() anymore until the callback is disabled by passing None as the callback for this method.