From fd2b8d529d684746eff57775cf2b8ec246b9a096 Mon Sep 17 00:00:00 2001 From: Melissa LeBlanc-Williams Date: Thu, 28 Sep 2023 14:44:42 -0700 Subject: [PATCH] Initial eink implementation - not complete --- displayio/_epaperdisplay.py | 292 ++++++++++++++++++++++++++++++++---- 1 file changed, 261 insertions(+), 31 deletions(-) diff --git a/displayio/_epaperdisplay.py b/displayio/_epaperdisplay.py index 114506c..ba5dbf1 100644 --- a/displayio/_epaperdisplay.py +++ b/displayio/_epaperdisplay.py @@ -17,17 +17,31 @@ displayio for Blinka """ -from typing import Optional +import time +from typing import Optional, Union import microcontroller +from digitalio import DigitalInOut from circuitpython_typing import ReadableBuffer -from ._group import Group +from ._displaycore import _DisplayCore +from ._group import Group, circuitpython_splash +from ._colorconverter import ColorConverter from ._displaybus import _DisplayBus +from ._area import Area +from ._constants import ( + CHIP_SELECT_TOGGLE_EVERY_BYTE, + CHIP_SELECT_UNTOUCHED, + DISPLAY_COMMAND, + DISPLAY_DATA, + NO_COMMAND, + DELAY, +) __version__ = "0.0.0+auto.0" __repo__ = "https://github.com/adafruit/Adafruit_Blinka_displayio.git" class EPaperDisplay: + # pylint: disable=too-many-instance-attributes """Manage updating an epaper display over a display bus This initializes an epaper display and connects it into CircuitPython. Unlike other @@ -61,33 +75,35 @@ class EPaperDisplay: write_color_ram_command: Optional[int] = None, color_bits_inverted: bool = False, highlight_color: int = 0x000000, - refresh_display_command: int, + refresh_display_command: Union[int, ReadableBuffer], refresh_time: float = 40.0, busy_pin: Optional[microcontroller.Pin] = None, busy_state: bool = True, - seconds_per_frame: float = 180.0, + seconds_per_frame: float = 180, always_toggle_chip_select: bool = False, grayscale: bool = False, - ): - # pylint: disable=too-many-locals, unused-argument - """ - Create a EPaperDisplay object on the given display bus (displayio.FourWire or - paralleldisplay.ParallelBus). - - The start_sequence and stop_sequence are bitpacked to minimize the ram impact. Every - command begins with a command byte followed by a byte to determine the parameter - count and if a delay is need after. When the top bit of the second byte is 1, the - next byte will be the delay time in milliseconds. The remaining 7 bits are the - parameter count excluding any delay byte. The third through final bytes are the - remaining command parameters. The next byte will begin a new command definition. + advanced_color_epaper: bool = False, + two_byte_sequence_length: bool = False, + start_up_time: float = 0, + address_little_endian: bool = False, + ) -> None: + # pylint: disable=too-many-locals + """Create a EPaperDisplay object on the given display bus (`displayio.FourWire` or + `paralleldisplay.ParallelBus`). + The ``start_sequence`` and ``stop_sequence`` are bitpacked to minimize the ram impact. Every + command begins with a command byte followed by a byte to determine the parameter count and + delay. When the top bit of the second byte is 1 (0x80), a delay will occur after the command + parameters are sent. The remaining 7 bits are the parameter count excluding any delay + byte. The bytes following are the parameters. When the delay bit is set, a single byte after + the parameters specifies the delay duration in milliseconds. The value 0xff will lead to an + extra long 500 ms delay instead of 255 ms. The next byte will begin a new command + definition. :param display_bus: The bus that the display is connected to - :type _DisplayBus: displayio.FourWire or displayio.ParallelBus - :param ~ReadableBuffer start_sequence: Byte-packed - initialization sequence. - :param ~ReadableBuffer stop_sequence: Byte-packed - initialization sequence. + :type _DisplayBus: displayio.FourWire or paralleldisplay.ParallelBus + :param ~circuitpython_typing.ReadableBuffer start_sequence: Byte-packed command sequence. + :param ~circuitpython_typing.ReadableBuffer stop_sequence: Byte-packed command sequence. :param int width: Width in pixels :param int height: Height in pixels :param int ram_width: RAM width in pixels @@ -110,7 +126,8 @@ class EPaperDisplay: :param bool color_bits_inverted: True if 0 bits are used to show the color. Otherwise, 1 means to show color. :param int highlight_color: RGB888 of source color to highlight with third ePaper color. - :param int refresh_display_command: Command used to start a display refresh + :param int refresh_display_command: Command used to start a display refresh. Single int + or byte-packed command sequence :param float refresh_time: Time it takes to refresh the display before the stop_sequence should be sent. Ignored when busy_pin is provided. :param microcontroller.Pin busy_pin: Pin used to signify the display is busy @@ -118,41 +135,254 @@ class EPaperDisplay: :param float seconds_per_frame: Minimum number of seconds between screen refreshes :param bool always_toggle_chip_select: When True, chip select is toggled every byte :param bool grayscale: When true, the color ram is the low bit of 2-bit grayscale + :param bool advanced_color_epaper: When true, the display is a 7-color advanced color + epaper (ACeP) + :param bool two_byte_sequence_length: When true, use two bytes to define sequence length + :param float start_up_time: Time to wait after reset before sending commands + :param bool address_little_endian: Send the least significant byte (not bit) of + multi-byte addresses first. Ignored when ram is addressed with one byte """ - self._bus = display_bus - self._width = width - self._height = height + + if isinstance(refresh_display_command, int): + refresh_sequence = bytearray([refresh_display_command, 0]) + if two_byte_sequence_length: + refresh_sequence += bytes([0]) + elif isinstance(refresh_display_command, ReadableBuffer): + refresh_sequence = bytearray(refresh_display_command) + else: + raise ValueError("Invalid refresh_display_command") + + if write_color_ram_command is None: + write_color_ram_command = NO_COMMAND + + if rotation % 90 != 0: + raise ValueError("Display rotation must be in 90 degree increments") + + color_depth = 1 + core_grayscale = True + + if advanced_color_epaper: + color_depth = 4 + grayscale = False + core_grayscale = False + + self._core = _DisplayCore( + bus=display_bus, + width=width, + height=height, + ram_width=ram_width, + ram_height=ram_height, + colstart=colstart, + rowstart=rowstart, + rotation=rotation, + color_depth=color_depth, + grayscale=core_grayscale, + pixels_in_byte_share_row=True, + bytes_per_cell=1, + reverse_pixels_in_byte=True, + reverse_bytes_in_word=True, + column_command=set_column_window_command, + row_command=set_row_window_command, + set_current_column_command=set_current_column_command, + set_current_row_command=set_current_row_command, + data_as_commands=False, + always_toggle_chip_select=always_toggle_chip_select, + sh1107_addressing=False, + address_little_endian=address_little_endian, + ) + + if highlight_color != 0x000000: + self._core.colorspace.tricolor = True + self._core.colorspace.tricolor_hue = ColorConverter._compute_hue( + highlight_color + ) + self._core.colorspace.tricolor_luma = ColorConverter._compute_luma( + highlight_color + ) + else: + self._core.colorspace.tricolor = False + + self._acep = advanced_color_epaper + self._core.colorspace.sevencolor = advanced_color_epaper + self._write_black_ram_command = write_black_ram_command + self._black_bits_inverted = black_bits_inverted + self._write_color_ram_command = write_color_ram_command + self._color_bits_inverted = color_bits_inverted + self._refresh_time = ( + refresh_time # TODO: Verify we are using seconds instead of ms + ) + self._busy_state = busy_state + self._refreshing = False + self._milliseconds_per_frame = seconds_per_frame * 1000 + self._chip_select = ( + CHIP_SELECT_TOGGLE_EVERY_BYTE + if always_toggle_chip_select + else CHIP_SELECT_UNTOUCHED + ) + self._grayscale = grayscale + + self._start_sequence = start_sequence + self._start_up_time = ( + start_up_time # TODO: Verify we are using seconds instead of ms + ) + self._stop_sequence = stop_sequence + self._refesh_sequence = refresh_sequence + self._busy = None + self._two_byte_sequence_length = two_byte_sequence_length + if busy_pin is not None: + self._busy = DigitalInOut(busy_pin) + self._busy.switch_to_input() + + # Clear the color memory if it isn't in use + if highlight_color == 0x00 and write_color_ram_command != NO_COMMAND: + """TODO: Clear""" + + self.show(circuitpython_splash) + + def __new__(cls, *args, **kwargs): + from . import ( # pylint: disable=import-outside-toplevel, cyclic-import + allocate_display, + ) + + display_instance = super().__new__(cls) + allocate_display(display_instance) + return display_instance def show(self, group: Group) -> None: # pylint: disable=unnecessary-pass """Switches to displaying the given group of layers. When group is None, the default CircuitPython terminal will be shown (eventually). """ - pass + if group is None: + group = circuitpython_splash + self._core.set_root_group(group) + + def update_refresh_mode( + self, start_sequence: ReadableBuffer, seconds_per_frame: float + ) -> None: + """Updates the ``start_sequence`` and ``seconds_per_frame`` parameters to enable + varying the refresh mode of the display.""" + # TODO: Implement def refresh(self) -> None: # pylint: disable=unnecessary-pass """Refreshes the display immediately or raises an exception if too soon. Use ``time.sleep(display.time_to_refresh)`` to sleep until a refresh can occur. """ - pass + # TODO: Implement + + def _get_refresh_areas(self) -> list[Area]: + """Get a list of areas to be refreshed""" + areas = [] + if self._core.full_refresh: + areas.append(self._core.area) + return areas + first_area = None + if self._core.current_group is not None: + self._core.current_group._get_refresh_areas( # pylint: disable=protected-access + areas + ) + first_area = areas[0] + if first_area is not None and self._core.row_command == NO_COMMAND: + # Do a full refresh if the display doesn't support partial updates + areas = [self._core.area] + return areas + + def _send_command_sequence( + self, should_wait_for_busy: bool, sequence: ReadableBuffer + ) -> None: + i = 0 + while i < len(sequence): + command = sequence[i] + data_size = sequence[i + 1] + delay = (data_size & DELAY) != 0 + data_size &= ~DELAY + data = sequence[i + 2 : i + 2 + data_size] + if self._two_byte_sequence_length: + data_size = ((data_size & ~DELAY) << 8) + sequence[i + 2] + data = sequence[i + 3 : i + 3 + data_size] + + self._core.begin_transaction() + self._core.send( + DISPLAY_COMMAND, CHIP_SELECT_TOGGLE_EVERY_BYTE, bytes([command]) + ) + self._core.send( + DISPLAY_DATA, + CHIP_SELECT_UNTOUCHED, + data, + ) + self._core.end_transaction() + delay_time_ms = 0 + if delay: + data_size += 1 + delay_time_ms = sequence[i + 1 + data_size] + if delay_time_ms == 255: + delay_time_ms = 500 + time.sleep(delay_time_ms / 1000) + if should_wait_for_busy: + self._wait_for_busy() + i += 2 + data_size + if self._two_byte_sequence_length: + i += 1 + + def _finish_refresh(self) -> None: + self._send_command_sequence(False, self._refesh_sequence) + self._refreshing = True + self._core.finish_refresh() + + def _wait_for_busy(self) -> None: + if self._busy is not None: + while self._busy.value != self._busy_state: + time.sleep(0.001) + + @property + def rotation(self) -> int: + """The rotation of the display as an int in degrees""" + return self._core.rotation + + @rotation.setter + def rotation(self, value: int) -> None: + if value % 90 != 0: + raise ValueError("Display rotation must be in 90 degree increments") + transposed = self._core.rotation in (90, 270) + will_transposed = value in (90, 270) + if transposed != will_transposed: + self._core.width, self._core.height = self._core.height, self._core.width + self._core.set_rotation(value) @property def time_to_refresh(self) -> float: """Time, in fractional seconds, until the ePaper display can be refreshed.""" - return 0.0 + return 0.0 # TODO: Implement + + @property + def busy(self) -> bool: + """True when the display is refreshing. This uses the ``busy_pin`` when available or the + ``refresh_time`` otherwise.""" + return self._refreshing @property def width(self) -> int: """Display Width""" - return self._width + return self._core.width @property def height(self) -> int: """Display Height""" - return self._height + return self._core.height @property def bus(self) -> _DisplayBus: """Current Display Bus""" - return self._bus + return self._core._bus + + @property + def root_group(self) -> Group: + """The root group on the epaper display. + If the root group is set to ``None``, no output will be shown. + """ + return self._core.root_group + + @root_group.setter + def root_group(self, new_group: Group) -> None: + self._core.root_group = new_group -- 2.49.0