rough beginnings of an ssd1375b driver

Author: ladyada

adafruit_epd/ssd1675b.py

@@ -0,0 +1,215 @@
+# The MIT License (MIT)
+#
+# Copyright (c) 2018 Dean Miller for Adafruit Industries
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+"""
+`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"
+
+_SSD1675B_DRIVER_CONTROL = const(0x01)
+_SSD1675B_GATE_VOLTAGE = const(0x03)
+_SSD1675B_SOURCE_VOLTAGE = const(0x04)
+_SSD1675B_INIT_SETTING = const(0x08)
+_SSD1675B_INIT_WRITE_REG = const(0x09)
+_SSD1675B_INIT_READ_REG = const(0x0A)
+_SSD1675B_BOOSTER_SOFT_START = const(0x0C)
+_SSD1675B_GATESCAN_START = const(0x0F)
+_SSD1675B_DEEP_SLEEP = const(0x10)
+_SSD1675B_DATA_MODE = const(0x11)
+_SSD1675B_SW_RESET = const(0x12)
+_SSD1675B_HV_READY = const(0x14)
+_SSD1675B_VCI_READY = const(0x15)
+_SSD1675B_TEMP_CONTROL = const(0x18)
+_SSD1675B_TEMP_WRITE = const(0x1A)
+_SSD1675B_TEMP_READ = const(0x1B)
+_SSD1675B_EXTTEMP_WRITE = const(0x1C)
+_SSD1675B_MASTER_ACTIVATE = const(0x20)
+_SSD1675B_DISP_CTRL1 = const(0x21)
+_SSD1675B_DISP_CTRL2 = const(0x22)
+_SSD1675B_WRITE_RAM1 = const(0x24)
+_SSD1675B_WRITE_RAM2 = const(0x26)
+_SSD1675B_READ_RAM = const(0x27)
+_SSD1675B_VCOM_SENSE = const(0x28)
+_SSD1675B_VCOM_DURATION = const(0x29)
+_SSD1675B_WRITE_VCOM_OTP = const(0x2A)
+_SSD1675B_WRITE_VCOM_CTRL = const(0x2B)
+_SSD1675B_WRITE_VCOM_REG = const(0x2C)
+_SSD1675B_READ_OTP = const(0x2D)
+_SSD1675B_READ_USERID = const(0x2E)
+_SSD1675B_READ_STATUS = const(0x2F)
+_SSD1675B_WRITE_WS_OTP = const(0x30)
+_SSD1675B_LOAD_WS_OTP = const(0x31)
+_SSD1675B_WRITE_LUT = const(0x32)
+_SSD1675B_CRC_CALC = const(0x34)
+_SSD1675B_CRC_READ = const(0x35)
+_SSD1675B_PROG_OTP = const(0x36)
+_SSD1675B_WRITE_DISPLAY_OPT = const(0x37)
+_SSD1675B_WRITE_USERID = const(0x38)
+_SSD1675B_OTP_PROGMODE = const(0x39)
+_SSD1675B_WRITE_DUMMY = const(0x3A)
+_SSD1675B_WRITE_GATELINE = const(0x3B)
+_SSD1675B_WRITE_BORDER = const(0x3C)
+_SSD1675B_READ_RAM = const(0x41)
+_SSD1675B_SET_RAMXPOS = const(0x44)
+_SSD1675B_SET_RAMYPOS = const(0x45)
+_SSD1675B_AUTOWRITE_RED = const(0x46)
+_SSD1675B_AUTOWRITE_BW = const(0x47)
+_SSD1675B_SET_RAMXCOUNT = const(0x4E)
+_SSD1675B_SET_RAMYCOUNT = const(0x4F)
+_SSD1675B_SET_ANALOGBLOCK = const(0x74)
+_SSD1675B_SET_DIGITALBLOCK = const(0x7E)
+_SSD1675B_NOP = const(0xFF)
+_LUT_DATA = b'\xa0\x90P\x00\x00\x00\x00\x00\x00\x00P\x90\xa0\x00\x00\x00\x00\x00\x00\x00\xa0\x90P\x00\x00\x00\x00\x00\x00\x00P\x90\xa0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0f\x0f\x00\x00\x00\x0f\x0f\x00\x00\x03\x0f\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x15A\xa82P,\x0b' # pylint: disable=line-too-long
+
+
+class Adafruit_SSD1675B(Adafruit_EPD):
+    """driver class for Adafruit SSD1675B 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(Adafruit_SSD1675B, self).__init__(width, height, spi, cs_pin, dc_pin,
+                                               sramcs_pin, rst_pin, busy_pin)
+        if width % 8 != 0:
+            width += (8 - width % 8)
+
+        self._buffer1_size = int(width * 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,
+                                                        buf_format=adafruit_framebuf.MHMSB)
+        self._framebuf2 = adafruit_framebuf.FrameBuffer(self._buffer2, width, height,
+                                                        buf_format=adafruit_framebuf.MHMSB)
+        self.set_black_buffer(0, True)
+        self.set_color_buffer(1, 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(_SSD1675B_SW_RESET)
+        self.busy_wait()
+
+        # set analog block control
+        self.command(_SSD1675B_SET_ANALOGBLOCK, bytearray([0x54]))
+        # set digital block control
+        self.command(_SSD1675B_SET_DIGITALBLOCK, bytearray([0x3B]))
+
+        # driver output control
+        self.command(_SSD1675B_DRIVER_CONTROL,
+                     bytearray([0xF9, 0x00, 0x00]))
+
+        # Data entry sequence
+        self.command(_SSD1675B_DATA_MODE, bytearray([0x01]))
+
+        # Set ram X start/end postion
+        self.command(_SSD1675B_SET_RAMXPOS, bytearray([0x00, 0x0F]))
+        # Set ram Y start/end postion
+        self.command(_SSD1675B_SET_RAMYPOS, bytearray([0xF9, 0x0, 0x0, 0x0]))
+
+        # Border color
+        self.command(_SSD1675B_WRITE_BORDER, bytearray([0x01]))
+
+        # Vcom Voltage
+        self.command(_SSD1675B_WRITE_VCOM_REG, bytearray([0x50]))
+        # Set gate voltage
+        self.command(_SSD1675B_GATE_VOLTAGE, _LUT_DATA[100:101])
+        # Set source voltage
+        self.command(_SSD1675B_SOURCE_VOLTAGE, _LUT_DATA[101:104])
+        # Set dummy line period
+        self.command(_SSD1675B_WRITE_DUMMY, _LUT_DATA[105:106])
+        # Set gate line width
+        self.command(_SSD1675B_WRITE_GATELINE, _LUT_DATA[106:107])
+        # LUT
+        self.command(_SSD1675B_WRITE_LUT, _LUT_DATA[0:100])
+
+        # Set temperature control
+        #self.command(_SSD1675B_TEMP_CONTROL, bytearray([0x80]))
+
+        # Set RAM X address counter
+        self.command(_SSD1675B_SET_RAMXCOUNT, bytearray([0]))
+        # Set RAM Y address counter
+        self.command(_SSD1675B_SET_RAMYCOUNT, bytearray([0xF9, 0]))
+
+        self.busy_wait()
+
+    def power_down(self):
+        """Power down the display - required when not actively displaying!"""
+        self.command(_SSD1675B_DEEP_SLEEP, bytearray([0x01]))
+        time.sleep(0.1)
+
+    def update(self):
+        """Update the display from internal memory"""
+        self.command(_SSD1675B_DISP_CTRL2, bytearray([0xFF]))
+        self.command(_SSD1675B_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(_SSD1675B_WRITE_RAM1, end=False)
+        if index == 1:
+            return self.command(_SSD1675B_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(_SSD1675B_SET_RAMXCOUNT, bytearray([x]))
+        self.command(_SSD1675B_SET_RAMYCOUNT, bytearray([y, y>>8]))