""" MicroPython Waveshare 4.2" Black/White GDEW042T2 e-paper display driver https://github.com/mcauser/micropython-waveshare-epaper MIT License Copyright (c) 2017 Waveshare Copyright (c) 2018 Mike Causer 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. """ from micropython import const from time import sleep_ms import ustruct # Display resolution EPD_WIDTH = const(400) EPD_HEIGHT = const(300) # Display commands PANEL_SETTING = const(0x00) POWER_SETTING = const(0x01) POWER_OFF = const(0x02) #POWER_OFF_SEQUENCE_SETTING = const(0x03) POWER_ON = const(0x04) #POWER_ON_MEASURE = const(0x05) BOOSTER_SOFT_START = const(0x06) DEEP_SLEEP = const(0x07) DATA_START_TRANSMISSION_1 = const(0x10) #DATA_STOP = const(0x11) DISPLAY_REFRESH = const(0x12) DATA_START_TRANSMISSION_2 = const(0x13) LUT_FOR_VCOM = const(0x20) LUT_WHITE_TO_WHITE = const(0x21) LUT_BLACK_TO_WHITE = const(0x22) LUT_WHITE_TO_BLACK = const(0x23) LUT_BLACK_TO_BLACK = const(0x24) PLL_CONTROL = const(0x30) #TEMPERATURE_SENSOR_COMMAND = const(0x40) #TEMPERATURE_SENSOR_SELECTION = const(0x41) #TEMPERATURE_SENSOR_WRITE = const(0x42) #TEMPERATURE_SENSOR_READ = const(0x43) VCOM_AND_DATA_INTERVAL_SETTING = const(0x50) #LOW_POWER_DETECTION = const(0x51) #TCON_SETTING = const(0x60) RESOLUTION_SETTING = const(0x61) #GSST_SETTING = const(0x65) #GET_STATUS = const(0x71) #AUTO_MEASUREMENT_VCOM = const(0x80) #READ_VCOM_VALUE = const(0x81) VCM_DC_SETTING = const(0x82) #PARTIAL_WINDOW = const(0x90) #PARTIAL_IN = const(0x91) #PARTIAL_OUT = const(0x92) #PROGRAM_MODE = const(0xA0) #ACTIVE_PROGRAMMING = const(0xA1) #READ_OTP = const(0xA2) #POWER_SAVING = const(0xE3) BUSY = const(0) # 0=busy, 1=idle class EPD: def __init__(self, spi, cs, dc, rst, busy): self.spi = spi self.cs = cs self.dc = dc self.rst = rst self.busy = busy self.cs.init(self.cs.OUT, value=1) self.dc.init(self.dc.OUT, value=0) self.rst.init(self.rst.OUT, value=0) self.busy.init(self.busy.IN) self.width = EPD_WIDTH self.height = EPD_HEIGHT # 44/42 bytes (look up tables) LUT_VCOM0 = bytearray(b'\x00\x17\x00\x00\x00\x02\x00\x17\x17\x00\x00\x02\x00\x0A\x01\x00\x00\x01\x00\x0E\x0E\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00') LUT_WW = bytearray(b'\x40\x17\x00\x00\x00\x02\x90\x17\x17\x00\x00\x02\x40\x0A\x01\x00\x00\x01\xA0\x0E\x0E\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00') LUT_BW = LUT_WW LUT_BB = bytearray(b'\x80\x17\x00\x00\x00\x02\x90\x17\x17\x00\x00\x02\x80\x0A\x01\x00\x00\x01\x50\x0E\x0E\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00') LUT_WB = LUT_BB def _command(self, command, data=None): self.dc(0) self.cs(0) self.spi.write(bytearray([command])) self.cs(1) if data is not None: self._data(data) def _data(self, data): self.dc(1) self.cs(0) self.spi.write(data) self.cs(1) def init(self): self.reset() self._command(POWER_SETTING, b'\x03\x00\x2B\x2B\xFF') # VDS_EN VDG_EN, VCOM_HV VGHL_LV[1] VGHL_LV[0], VDH, VDL, VDHR self._command(BOOSTER_SOFT_START, b'\x17\x17\x17') # 07 0f 17 1f 27 2F 37 2f self._command(POWER_ON) self.wait_until_idle() self._command(PANEL_SETTING, b'\xBF\x0B') # KW-BF KWR-AF BWROTP 0f self._command(PLL_CONTROL, b'\x3C') # 3A 100HZ 29 150Hz 39 200HZ 31 171HZ def wait_until_idle(self): while self.busy.value() == BUSY: sleep_ms(100) def reset(self): self.rst(0) sleep_ms(200) self.rst(1) sleep_ms(200) def set_lut(self): self._command(LUT_FOR_VCOM, self.LUT_VCOM0) # vcom self._command(LUT_WHITE_TO_WHITE, self.LUT_WW) # ww -- self._command(LUT_BLACK_TO_WHITE, self.LUT_BW) # bw r self._command(LUT_WHITE_TO_BLACK, self.LUT_BB) # wb w self._command(LUT_BLACK_TO_BLACK, self.LUT_WB) # bb b # draw the current frame memory def display_frame(self, frame_buffer): self._command(RESOLUTION_SETTING, ustruct.pack(">HH", EPD_WIDTH, EPD_HEIGHT)) self._command(VCM_DC_SETTING, b'\x12') self._command(VCOM_AND_DATA_INTERVAL_SETTING) self._command(0x97) # VBDF 17|D7 VBDW 97 VBDB 57 VBDF F7 VBDW 77 VBDB 37 VBDR B7 # TODO should ^ this be _data(0x97), not sure what it does if (frame_buffer != None): self._command(DATA_START_TRANSMISSION_1) for i in range(0, self.width * self.height // 8): self._data(bytearray([0xFF])) # bit set: white, bit reset: black sleep_ms(2) self._command(DATA_START_TRANSMISSION_2) for i in range(0, self.width * self.height // 8): self._data(bytearray([frame_buffer[i]])) sleep_ms(2) self.set_lut() self._command(DISPLAY_REFRESH) sleep_ms(100) self.wait_until_idle() # to wake call reset() or init() def sleep(self): self._command(VCOM_AND_DATA_INTERVAL_SETTING, b'\x17') # border floating self._command(VCM_DC_SETTING) # VCOM to 0V self._command(PANEL_SETTING) sleep_ms(100) self._command(POWER_SETTING, b'\x00\x00\x00\x00\x00') # VG&VS to 0V fast sleep_ms(100) self._command(POWER_OFF) self.wait_until_idle() self._command(DEEP_SLEEP, b'\xA5')