alba/frontend/lib/waveshare_epd/epd2in7b_V2.py

# *****************************************************************************
# * | File        :	  epd2in7b_V2.py
# * | Author      :   Waveshare team
# * | Function    :   Electronic paper driver
# * | Info        :
# *----------------
# * | This version:   V1.0
# * | Date        :   2020-10-22
# # | 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       = 176
EPD_HEIGHT      = 264

logger = logging.getLogger(__name__)

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(2)
        epdconfig.digital_write(self.reset_pin, 1)
        epdconfig.delay_ms(200)   

    # Send Command
    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)

    # Send Data
    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)
        
    # Read Busy
    def ReadBusy(self):
        logger.debug("e-Paper busy")
        while(epdconfig.digital_read(self.busy_pin) == 1):      # 0: idle, 1: busy
            epdconfig.delay_ms(10)
        logger.debug("e-Paper busy release")
            
    # Setting the display window
    def SetWindows(self, Xstart, Ystart, Xend, Yend):
        self.send_command(0x44)
        self.send_data((Xstart >> 3) & 0xff)
        self.send_data((Xend >> 3) & 0xff)
        
        self.send_command(0x45)
        self.send_data(Ystart & 0xff)
        self.send_data((Ystart >> 8) & 0xff)
        self.send_data(Yend & 0xff)
        self.send_data((Yend >> 8) & 0xff)
    
    # Set Cursor
    def SetCursor(self, Xstart, Ystart):
        self.send_command(0x4E)
        self.send_data(Xstart & 0xff)
        self.send_command(0x4F)
        self.send_data(Ystart & 0xff)
        self.send_data((Ystart >> 8) & 0xff)
        
    # Initialize the e-Paper register
    def init(self):
        if (epdconfig.module_init() != 0):
            return -1
            
        self.reset()

        self.ReadBusy() 
        self.send_command(0x12)      
        self.ReadBusy() 
        
        self.send_command(0x00)     
        self.send_data(0x27) 
        self.send_data(0x01) 
        self.send_data(0x00) 
        
        self.send_command(0x11)     
        self.send_data(0x03) 
        
        self.SetWindows(0, 0, self.width-1, self.height-1)
        self.SetCursor(0, 0)
        return 0

    def getbuffer(self, image):
        # logger.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()
        # logger.debug("imwidth = %d, imheight = %d",imwidth,imheight)
        if(imwidth == self.width and imheight == self.height):
            logger.debug("Vertical")
            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):
            logger.debug("Horizontal")
            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
    
    # Sends the image buffer in RAM to e-Paper and displays
    def display(self, imageblack, imagered):
        Width = self.width / 8 
        Height = self.height 

        self.send_command(0x24) 
        for i in range(0, int(Width * Height)):
            self.send_data(imageblack[i]) 

        self.send_command(0x26) 
        for i in range(0, int(Width * Height)):
            self.send_data(~imagered[i]) 
        
        self.TurnOnDisplay()

    # Clear the screen
    def Clear(self):
        self.send_command(0x24)
        for i in range(0, int(self.width * self.height / 8)):
            self.send_data(0xff)

        self.send_command(0x26)
        for i in range(0, int(self.width * self.height / 8)):
            self.send_data(0x00)
            
        self.TurnOnDisplay()
        
    # Turn on display
    def TurnOnDisplay(self):
        self.send_command(0x20)
        self.ReadBusy()

    # Enter sleep mode
    def sleep(self):
        self.send_command(0x10)
        self.send_data(0x01)
        
        epdconfig.delay_ms(2000)
        epdconfig.module_exit()
### END OF FILE ###