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+# *****************************************************************************
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+# * | File : epd4in37g.py
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+# * | Author : Waveshare team
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+# * | Function : Electronic paper driver
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+# * | Info :
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+# *----------------
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+# * | This version: V1.0
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+# * | Date : 2022-08-15
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+# # | Info : python demo
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+# -----------------------------------------------------------------------------
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+# ******************************************************************************/
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+# Permission is hereby granted, free of charge, to any person obtaining a copy
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+# of this software and associated documnetation files (the "Software"), to deal
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+# in the Software without restriction, including without limitation the rights
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+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+# copies of the Software, and to permit persons to whom the Software is
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+# furished to do so, subject to the following conditions:
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+#
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+# The above copyright notice and this permission notice shall be included in
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+# all copies or substantial portions of the Software.
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+#
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+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+# FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+# LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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+# THE SOFTWARE.
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+#
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+
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+import logging
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+from . import epdconfig
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+
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+import PIL
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+from PIL import Image
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+import io
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+
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+# Display resolution
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+EPD_WIDTH = 512
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+EPD_HEIGHT = 368
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+
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+logger = logging.getLogger(__name__)
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+
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+class EPD:
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+ def __init__(self):
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+ self.reset_pin = epdconfig.RST_PIN
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+ self.dc_pin = epdconfig.DC_PIN
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+ self.busy_pin = epdconfig.BUSY_PIN
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+ self.cs_pin = epdconfig.CS_PIN
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+ self.width = EPD_WIDTH
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+ self.height = EPD_HEIGHT
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+ self.BLACK = 0x000000 # 00 BGR
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+ self.WHITE = 0xffffff # 01
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+ self.YELLOW = 0x00ffff # 10
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+ self.RED = 0x0000ff # 11
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+
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+ # Hardware reset
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+ def reset(self):
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+ epdconfig.digital_write(self.reset_pin, 1)
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+ epdconfig.delay_ms(200)
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+ epdconfig.digital_write(self.reset_pin, 0) # module reset
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+ epdconfig.delay_ms(2)
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+ epdconfig.digital_write(self.reset_pin, 1)
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+ epdconfig.delay_ms(200)
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+
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+ def send_command(self, command):
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+ epdconfig.digital_write(self.dc_pin, 0)
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+ epdconfig.digital_write(self.cs_pin, 0)
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+ epdconfig.spi_writebyte([command])
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+ epdconfig.digital_write(self.cs_pin, 1)
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+
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+ def send_data(self, data):
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+ epdconfig.digital_write(self.dc_pin, 1)
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+ epdconfig.digital_write(self.cs_pin, 0)
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+ epdconfig.spi_writebyte([data])
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+ epdconfig.digital_write(self.cs_pin, 1)
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+
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+ def ReadBusyH(self):
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+ logger.debug("e-Paper busy H")
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+ while(epdconfig.digital_read(self.busy_pin) == 0): # 0: idle, 1: busy
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+ epdconfig.delay_ms(5)
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+ logger.debug("e-Paper busy H release")
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+
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+ def ReadBusyL(self):
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+ logger.debug("e-Paper busy L")
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+ while(epdconfig.digital_read(self.busy_pin) == 1): # 0: busy, 1: idle
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+ epdconfig.delay_ms(5)
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+ logger.debug("e-Paper busy L release")
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+
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+ def TurnOnDisplay(self):
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+ self.send_command(0x12) # DISPLAY_REFRESH
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+ self.send_data(0x00)
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+ self.ReadBusyH()
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+
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+ self.send_command(0x02) # POWER_OFF
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+ self.send_data(0X00)
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+ self.ReadBusyH()
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+
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+ def init(self):
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+ if (epdconfig.module_init() != 0):
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+ return -1
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+ # EPD hardware init start
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+ self.reset()
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+ self.ReadBusyH()
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+ epdconfig.delay_ms(30)
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+
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+ self.send_command(0xAA)
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+ self.send_data(0x49)
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+ self.send_data(0x55)
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+ self.send_data(0x20)
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+ self.send_data(0x08)
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+ self.send_data(0x09)
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+ self.send_data(0x18)
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+
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+ self.send_command(0x01)
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+ self.send_data(0x3F)
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+
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+ self.send_command(0x00)
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+ self.send_data(0x4F)
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+ self.send_data(0x69)
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+
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+
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+ self.send_command(0x05)
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+ self.send_data(0x40)
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+ self.send_data(0x1F)
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+ self.send_data(0x1F)
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+ self.send_data(0x2C)
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+
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+ self.send_command(0x08)
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+ self.send_data(0x6F)
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+ self.send_data(0x1F)
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+ self.send_data(0x1F)
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+ self.send_data(0x22)
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+
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+ # ===================
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+ # 20211212
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+ # First setting
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+ self.send_command(0x06)
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+ self.send_data(0x6F)
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+ self.send_data(0x1F)
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+ self.send_data(0x17)
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+ self.send_data(0x17)
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+ # ===================
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+
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+ self.send_command(0x03)
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+ self.send_data(0x00)
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+ self.send_data(0x54)
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+ self.send_data(0x00)
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+ self.send_data(0x44)
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+
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+ self.send_command(0x60)
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+ self.send_data(0x02)
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+ self.send_data(0x00)
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+ # Please notice that PLL must be set for version 2 IC
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+ self.send_command(0x30)
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+ self.send_data(0x08)
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+
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+ self.send_command(0x50)
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+ self.send_data(0x3F)
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+
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+ self.send_command(0x61)
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+ self.send_data(0x02)
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+ self.send_data(0x00)
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+ self.send_data(0x01)
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+ self.send_data(0x70)
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+
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+ self.send_command(0xE3)
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+ self.send_data(0x2F)
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+
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+ self.send_command(0x84)
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+ self.send_data(0x01)
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+ return 0
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+
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+ def getbuffer(self, image):
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+ # Create a pallette with the 4 colors supported by the panel
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+ pal_image = Image.new("P", (1,1))
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+ pal_image.putpalette( (0,0,0, 255,255,255, 255,255,0, 255,0,0) + (0,0,0)*252)
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+
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+ # Check if we need to rotate the image
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+ imwidth, imheight = image.size
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+ if(imwidth == self.width and imheight == self.height):
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+ image_temp = image
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+ elif(imwidth == self.height and imheight == self.width):
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+ image_temp = image.rotate(90, expand=True)
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+ else:
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+ logger.warning("Invalid image dimensions: %d x %d, expected %d x %d" % (imwidth, imheight, self.width, self.height))
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+
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+ # Convert the soruce image to the 4 colors, dithering if needed
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+ image_4color = image_temp.convert("RGB").quantize(palette=pal_image)
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+ buf_4color = bytearray(image_4color.tobytes('raw'))
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+
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+ # into a single byte to transfer to the panel
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+ buf = [0x00] * int(self.width * self.height / 4)
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+ idx = 0
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+ for i in range(0, len(buf_4color), 4):
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+ buf[idx] = (buf_4color[i] << 6) + (buf_4color[i+1] << 4) + (buf_4color[i+2] << 2) + buf_4color[i+3]
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+ idx += 1
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+ return buf
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+
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+ def display(self, image):
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+ if self.width % 4 == 0 :
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+ Width = self.width // 4
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+ else :
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+ Width = self.width // 4 + 1
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+ Height = self.height
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+
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+ self.send_command(0x04)
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+ self.ReadBusyH()
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+
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+ self.send_command(0x10)
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+ for j in range(0, Height):
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+ for i in range(0, Width):
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+ self.send_data(image[i + j * Width])
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+ self.TurnOnDisplay()
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+
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+ def Clear(self, color=0x55):
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+ if self.width % 4 == 0 :
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+ Width = self.width // 4
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+ else :
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+ Width = self.width // 4 + 1
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+ Height = self.height
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+
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+ self.send_command(0x04)
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+ self.ReadBusyH()
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+
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+ self.send_command(0x10)
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+ for j in range(0, Height):
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+ for i in range(0, Width):
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+ self.send_data(color)
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+ self.TurnOnDisplay()
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+
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+ def sleep(self):
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+ self.send_command(0x02) # POWER_OFF
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+ self.send_data(0x00)
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+
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+ self.send_command(0x07) # DEEP_SLEEP
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+ self.send_data(0XA5)
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+
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+ epdconfig.delay_ms(2000)
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+ epdconfig.module_exit()
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+### END OF FILE ###
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+
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SSYYL
