137 lines
4 KiB
Python
137 lines
4 KiB
Python
# SPDX-FileCopyrightText: Copyright (c) 2025 Scott Shawcroft for Adafruit Industries
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#
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# SPDX-License-Identifier: MIT
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"""
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`adafruit_jd79661`
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================================================================================
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CircuitPython `displayio` driver for JD79661-based ePaper displays
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* Author(s): Scott Shawcroft
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Implementation Notes
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--------------------
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**Hardware:**
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* JD79661-based 4-color ePaper displays (128x250 resolution) - Black, White, Red, Yellow
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**Software and Dependencies:**
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* Adafruit CircuitPython firmware for the supported boards:
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https://github.com/adafruit/circuitpython/releases
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"""
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from epaperdisplay import EPaperDisplay
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try:
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import typing
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from fourwire import FourWire
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except ImportError:
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pass
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__version__ = "0.0.0+auto.0"
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__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_JD79661.git"
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# JD79661 Command definitions
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_JD79661_PANEL_SETTING = 0x00
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_JD79661_POWER_SETTING = 0x01
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_JD79661_POWER_OFF = 0x02
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_JD79661_POWER_ON = 0x04
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_JD79661_BOOSTER_SOFTSTART = 0x06
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_JD79661_DEEP_SLEEP = 0x07
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_JD79661_DATA_START_XMIT = 0x10
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_JD79661_DISPLAY_REFRESH = 0x12
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_JD79661_CDI = 0x50
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_JD79661_PLL_CONTROL = 0x60
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_JD79661_RESOLUTION = 0x61
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_START_SEQUENCE = (
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b"\x4d\x01\x78" # Set register 0x4D to 0x78
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b"\x00\x02\x8f\x29" # Panel setting (128x250 resolution)
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b"\x01\x02\x07\x00" # Power setting
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b"\x03\x03\x10\x54\x44" # Power offset
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b"\x06\x07\x05\x00\x3f\x0a\x25\x12\x1a" # Booster soft start
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b"\x50\x01\x37" # CDI
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b"\x60\x02\x02\x02" # TCON
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b"\x61\x04\x00\x80\x00\xfa" # Resolution (0, 128, 0, 250)
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b"\xe7\x01\x1c" # Additional config register
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b"\xe3\x01\x22" # Additional config register
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b"\xb4\x01\xd0" # Additional config register
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b"\xb5\x01\x03" # Additional config register
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b"\xe9\x01\x01" # Additional config register
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b"\x30\x01\x08" # PLL Control
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b"\x04\x00" # Power on and wait
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)
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_STOP_SEQUENCE = (
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b"\x02\x80\x00" # Power off and wait
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b"\x07\x01\xa5" # Deep sleep
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)
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_REFRESH_SEQUENCE = b"\x12\x01\x00" # Display refresh
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# pylint: disable=too-few-public-methods
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class JD79661(EPaperDisplay):
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r"""JD79661 driver
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:param bus: The data bus the display is on
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:param \**kwargs:
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See below
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:Keyword Arguments:
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* *width* (``int``) --
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Display width
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* *height* (``int``) --
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Display height
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* *rotation* (``int``) --
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Display rotation
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"""
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def __init__(self, bus: FourWire, **kwargs) -> None:
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stop_sequence = bytearray(_STOP_SEQUENCE)
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try:
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bus.reset()
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except RuntimeError:
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# No reset pin defined, so no deep sleeping
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stop_sequence = b""
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start_sequence = bytearray(_START_SEQUENCE)
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width = kwargs.get("width", 128)
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height = kwargs.get("height", 250)
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if "rotation" in kwargs and kwargs["rotation"] % 180 != 90:
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width, height = height, width
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# Update resolution in start sequence (bytes at position for resolution command)
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# Find the resolution command in the sequence and update it
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res_pos = start_sequence.find(b"\x61\x04")
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if res_pos != -1:
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if height % 4 != 0:
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height += 4 - height % 4
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start_sequence[res_pos + 2] = (height >> 8) & 0xFF
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start_sequence[res_pos + 3] = height & 0xFF
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start_sequence[res_pos + 4] = (width >> 8) & 0xFF
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start_sequence[res_pos + 5] = width & 0xFF
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print(start_sequence.hex(" "))
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super().__init__(
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bus,
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start_sequence,
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stop_sequence,
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**kwargs,
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ram_width=128,
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ram_height=250,
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busy_state=False,
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write_black_ram_command=_JD79661_DATA_START_XMIT,
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write_color_ram_command=None, # JD79661 uses single RAM with 2-bit pixels
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refresh_display_command=_REFRESH_SEQUENCE,
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always_toggle_chip_select=True,
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address_little_endian=False,
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)
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