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