text: # *****************************************************************************
  # * | File        :	  epd4in2bc.py
  # * | Author      :   Waveshare team
  # * | Function    :   Electronic paper driver
  # * | Info        :
  # *----------------
  # * | This version:   V4.0
  # * | Date        :   2019-06-20
  # # | Info        :   python demo
  # -----------------------------------------------------------------------------
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documnetation 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
  # furished 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 OR 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.
  #
  
  import logging
  from . import epdconfig
  
  # Display resolution
  EPD_WIDTH       = 400
  EPD_HEIGHT      = 300
  
  class EPD:
      def __init__(self):
          self.reset_pin = epdconfig.RST_PIN
          self.dc_pin = epdconfig.DC_PIN
          self.busy_pin = epdconfig.BUSY_PIN
          self.cs_pin = epdconfig.CS_PIN
          self.width = EPD_WIDTH
          self.height = EPD_HEIGHT
  
      # Hardware reset
      def reset(self):
          epdconfig.digital_write(self.reset_pin, 1)
          epdconfig.delay_ms(200) 
          epdconfig.digital_write(self.reset_pin, 0)
          epdconfig.delay_ms(10)
          epdconfig.digital_write(self.reset_pin, 1)
          epdconfig.delay_ms(200)   
  
      def send_command(self, command):
          epdconfig.digital_write(self.dc_pin, 0)
          epdconfig.digital_write(self.cs_pin, 0)
          epdconfig.spi_writebyte([command])
          epdconfig.digital_write(self.cs_pin, 1)
  
      def send_data(self, data):
          epdconfig.digital_write(self.dc_pin, 1)
          epdconfig.digital_write(self.cs_pin, 0)
          epdconfig.spi_writebyte([data])
          epdconfig.digital_write(self.cs_pin, 1)
          
      def ReadBusy(self):
          logging.debug("e-Paper busy")
          while(epdconfig.digital_read(self.busy_pin) == 0): # 0: idle, 1: busy
              epdconfig.delay_ms(100)
          logging.debug("e-Paper busy release")
              
      def init(self):
          if (epdconfig.module_init() != 0):
              return -1
              
          self.reset()
  
          self.send_command(0x06) # BOOSTER_SOFT_START
          self.send_data (0x17)
          self.send_data (0x17)
          self.send_data (0x17) # 07 0f 17 1f 27 2F 37 2f
          
          self.send_command(0x04) # POWER_ON
          self.ReadBusy()
          
          self.send_command(0x00) # PANEL_SETTING
          self.send_data(0x0F) # LUT from OTP
          
          return 0
  
      def getbuffer(self, image):
          # logging.debug("bufsiz = ",int(self.width/8) * self.height)
          buf = [0xFF] * (int(self.width/8) * self.height)
          image_monocolor = image.convert('1')
          imwidth, imheight = image_monocolor.size
          pixels = image_monocolor.load()
          # logging.debug("imwidth = %d, imheight = %d",imwidth,imheight)
          if(imwidth == self.width and imheight == self.height):
              logging.debug("Horizontal")
              for y in range(imheight):
                  for x in range(imwidth):
                      # Set the bits for the column of pixels at the current position.
                      if pixels[x, y] == 0:
                          buf[int((x + y * self.width) / 8)] &= ~(0x80 >> (x % 8))
          elif(imwidth == self.height and imheight == self.width):
              logging.debug("Vertical")
              for y in range(imheight):
                  for x in range(imwidth):
                      newx = y
                      newy = self.height - x - 1
                      if pixels[x, y] == 0:
                          buf[int((newx + newy*self.width) / 8)] &= ~(0x80 >> (y % 8))
          return buf
  
      def display(self, imageblack, imagered):
          self.send_command(0x10)
          for i in range(0, int(self.width * self.height / 8)):
              self.send_data(imageblack[i])
          
          self.send_command(0x13)
          for i in range(0, int(self.width * self.height / 8)):
              self.send_data(imagered[i])
          
          self.send_command(0x12) 
          self.ReadBusy()
          
      def Clear(self):
          self.send_command(0x10)
          for i in range(0, int(self.width * self.height / 8)):
              self.send_data(0xFF)
              
          self.send_command(0x13)
          for i in range(0, int(self.width * self.height / 8)):
              self.send_data(0xFF)
          
          self.send_command(0x12) 
          self.ReadBusy()
  
      def sleep(self):
          self.send_command(0x02) # POWER_OFF
          self.ReadBusy()
          self.send_command(0x07) # DEEP_SLEEP
          self.send_data(0xA5) # check code
          
          epdconfig.module_exit()
  ### END OF FILE ###
  
  