text: # SPDX-FileCopyrightText: 2018 Dean Miller for Adafruit Industries
  #
  # SPDX-License-Identifier: MIT
  
  """
  `adafruit_epd.ssd1675` - Adafruit SSD1675 - ePaper display driver
  ====================================================================================
  CircuitPython driver for Adafruit SSD1675 display breakouts
  * Author(s): Dean Miller, Ladyada
  """
  
  import time
  from micropython import const
  import adafruit_framebuf
  from adafruit_epd.epd import Adafruit_EPD
  
  __version__ = "0.0.0-auto.0"
  __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_EPD.git"
  
  _SSD1675_DRIVER_CONTROL = const(0x01)
  _SSD1675_GATE_VOLTAGE = const(0x03)
  _SSD1675_SOURCE_VOLTAGE = const(0x04)
  _SSD1675_DEEP_SLEEP = const(0x10)
  _SSD1675_DATA_MODE = const(0x11)
  _SSD1675_SW_RESET = const(0x12)
  _SSD1675_HV_READY = const(0x14)
  _SSD1675_VCI_READY = const(0x15)
  _SSD1675_TEMP_WRITE = const(0x1A)
  _SSD1675_MASTER_ACTIVATE = const(0x20)
  _SSD1675_DISP_CTRL1 = const(0x21)
  _SSD1675_DISP_CTRL2 = const(0x22)
  _SSD1675_WRITE_RAM1 = const(0x24)
  _SSD1675_WRITE_RAM2 = const(0x26)
  _SSD1675_WRITE_VCOM = const(0x2C)
  _SSD1675_READ_OTP = const(0x2D)
  _SSD1675_WRITE_LUT = const(0x32)
  _SSD1675_WRITE_DUMMY = const(0x3A)
  _SSD1675_WRITE_GATELINE = const(0x3B)
  _SSD1675_WRITE_BORDER = const(0x3C)
  _SSD1675_SET_RAMXPOS = const(0x44)
  _SSD1675_SET_RAMYPOS = const(0x45)
  _SSD1675_SET_RAMXCOUNT = const(0x4E)
  _SSD1675_SET_RAMYCOUNT = const(0x4F)
  _SSD1675_SET_ANALOGBLOCK = const(0x74)
  _SSD1675_SET_DIGITALBLOCK = const(0x7E)
  _LUT_DATA = b"\x80`@\x00\x00\x00\x00\x10` \x00\x00\x00\x00\x80`@\x00\x00\x00\x00\x10` \x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x03\x00\x00\x02\t\t\x00\x00\x02\x03\x03\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x15A\xa820\n"  # pylint: disable=line-too-long
  
  
  class Adafruit_SSD1675(Adafruit_EPD):
      """driver class for Adafruit SSD1675 ePaper display breakouts"""
  
      # pylint: disable=too-many-arguments
      def __init__(
          self, width, height, spi, *, cs_pin, dc_pin, sramcs_pin, rst_pin, busy_pin
      ):
          super().__init__(
              width, height, spi, cs_pin, dc_pin, sramcs_pin, rst_pin, busy_pin
          )
          stride = width
          if stride % 8 != 0:
              stride += 8 - stride % 8
  
          self._buffer1_size = int(stride * height / 8)
          self._buffer2_size = self._buffer1_size
  
          if sramcs_pin:
              self._buffer1 = self.sram.get_view(0)
              self._buffer2 = self.sram.get_view(self._buffer1_size)
          else:
              self._buffer1 = bytearray(self._buffer1_size)
              self._buffer2 = bytearray(self._buffer2_size)
          # since we have *two* framebuffers - one for red and one for black
          # we dont subclass but manage manually
          self._framebuf1 = adafruit_framebuf.FrameBuffer(
              self._buffer1,
              width,
              height,
              stride=stride,
              buf_format=adafruit_framebuf.MHMSB,
          )
          self._framebuf2 = adafruit_framebuf.FrameBuffer(
              self._buffer2,
              width,
              height,
              stride=stride,
              buf_format=adafruit_framebuf.MHMSB,
          )
          self.set_black_buffer(0, True)
          self.set_color_buffer(0, True)
          # pylint: enable=too-many-arguments
  
      def begin(self, reset=True):
          """Begin communication with the display and set basic settings"""
          if reset:
              self.hardware_reset()
          self.power_down()
  
      def busy_wait(self):
          """Wait for display to be done with current task, either by polling the
          busy pin, or pausing"""
          if self._busy:
              while self._busy.value:
                  time.sleep(0.01)
          else:
              time.sleep(0.5)
  
      def power_up(self):
          """Power up the display in preparation for writing RAM and updating"""
          self.hardware_reset()
          time.sleep(0.1)
          self.busy_wait()
  
          self.command(_SSD1675_SW_RESET)
          self.busy_wait()
  
          # set analog block control
          self.command(_SSD1675_SET_ANALOGBLOCK, bytearray([0x54]))
          # set digital block control
          self.command(_SSD1675_SET_DIGITALBLOCK, bytearray([0x3B]))
  
          # driver output control
          self.command(_SSD1675_DRIVER_CONTROL, bytearray([0xFA, 0x01, 0x00]))
          # Data entry sequence
          self.command(_SSD1675_DATA_MODE, bytearray([0x03]))
          # Set ram X start/end postion
          self.command(_SSD1675_SET_RAMXPOS, bytearray([0x00, 0x0F]))
          # Set ram Y start/end postion
          self.command(_SSD1675_SET_RAMYPOS, bytearray([0, 0, 0xF9, 0]))
          # Border color
          self.command(_SSD1675_WRITE_BORDER, bytearray([0x03]))
          # Vcom Voltage
          self.command(_SSD1675_WRITE_VCOM, bytearray([0x70]))
          # Set gate voltage
          self.command(_SSD1675_GATE_VOLTAGE, _LUT_DATA[70:71])
          # Set gate voltage
          self.command(_SSD1675_SOURCE_VOLTAGE, _LUT_DATA[71:74])
          # Set dummy line period
          self.command(_SSD1675_WRITE_DUMMY, _LUT_DATA[74:75])
          # Set gate line width
          self.command(_SSD1675_WRITE_GATELINE, _LUT_DATA[75:76])
          # LUT
          self.command(_SSD1675_WRITE_LUT, _LUT_DATA[0:70])
  
          self.command(_SSD1675_SET_RAMXCOUNT, bytearray([0]))
          # Set RAM Y address counter
          self.command(_SSD1675_SET_RAMYCOUNT, bytearray([0xF9, 0]))
  
          self.busy_wait()
  
      def power_down(self):
          """Power down the display - required when not actively displaying!"""
          self.command(_SSD1675_DEEP_SLEEP, bytearray([0x01]))
          time.sleep(0.1)
  
      def update(self):
          """Update the display from internal memory"""
          self.command(_SSD1675_DISP_CTRL2, bytearray([0xC7]))
          self.command(_SSD1675_MASTER_ACTIVATE)
          self.busy_wait()
          if not self._busy:
              time.sleep(3)  # wait 3 seconds
  
      def write_ram(self, index):
          """Send the one byte command for starting the RAM write process. Returns
          the byte read at the same time over SPI. index is the RAM buffer, can be
          0 or 1 for tri-color displays."""
          if index == 0:
              return self.command(_SSD1675_WRITE_RAM1, end=False)
          if index == 1:
              return self.command(_SSD1675_WRITE_RAM2, end=False)
          raise RuntimeError("RAM index must be 0 or 1")
  
      def set_ram_address(self, x, y):  # pylint: disable=unused-argument, no-self-use
          """Set the RAM address location, not used on this chipset but required by
          the superclass"""
          self.command(_SSD1675_SET_RAMXCOUNT, bytearray([x]))
          self.command(_SSD1675_SET_RAMYCOUNT, bytearray([y, y >> 8]))
  