paralleldisplay – Native helpers for driving parallel displays

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class paralleldisplay.ParallelBus(*, data0: microcontroller.Pin, command: microcontroller.Pin, chip_select: microcontroller.Pin, write: microcontroller.Pin, read: microcontroller.Pin | None, reset: microcontroller.Pin | None = None, frequency: int = 30000000)

Manage updating a display over 8-bit parallel bus in the background while Python code runs. This protocol may be referred to as 8080-I Series Parallel Interface in datasheets. It doesn’t handle display initialization.

Create a ParallelBus object associated with the given pins. The bus is inferred from data0 by implying the next 7 additional pins on a given GPIO port.

The parallel bus and pins are then in use by the display until displayio.release_displays() is called even after a reload. (It does this so CircuitPython can use the display after your code is done.) So, the first time you initialize a display bus in code.py you should call displayio.release_displays() first, otherwise it will error after the first code.py run.

Parameters:

• data_pins (microcontroller.Pin) – A list of data pins. Specify exactly one of data_pins or data0.

• data0 (microcontroller.Pin) – The first data pin. The rest are implied

• command (microcontroller.Pin) – Data or command pin

• chip_select (microcontroller.Pin) – Chip select pin

• write (microcontroller.Pin) – Write pin

• read (microcontroller.Pin) – Read pin, optional

• reset (microcontroller.Pin) – Reset pin, optional

• frequency (int) – The communication frequency in Hz for the display on the bus

reset() → None

Performs a hardware reset via the reset pin. Raises an exception if called when no reset pin is available.

send(command: int, data: circuitpython_typing.ReadableBuffer) → None

Sends the given command value followed by the full set of data. Display state, such as vertical scroll, set via send may or may not be reset once the code is done.