Cannot wakeup from sleep

[cryptax]

The epd2in7b library does not provide any function to wake up from sleep(). Once it is called, reset() for instance does not wake up the screen. Please assist to wake up the screen. Should we send the command POWER_ON? and something else?

For example, see the program below. We can display text as much as we want until epd.sleep(). Once sleep is called, the program hangs during display of text number 3.

#!/usr/bin/python
# -*- coding:utf-8 -*-

import epd2in7b
from PIL import Image,ImageDraw,ImageFont

print("Clear the screen")
epd = epd2in7b.EPD()
epd.init()
epd.Clear(0xFF) # clears the screen

def display_text(x,y, textblack, textred):

    HBlackimage = Image.new('1', (epd2in7b.EPD_HEIGHT, epd2in7b.EPD_WIDTH), 255) # 264 x 176 
    HRedimage = Image.new('1', (epd2in7b.EPD_HEIGHT, epd2in7b.EPD_WIDTH), 255)  
    drawblack = ImageDraw.Draw(HBlackimage)
    drawred = ImageDraw.Draw(HRedimage)

    font36 = ImageFont.truetype('/usr/share/fonts/truetype/wqy/wqy-microhei.ttc', 36)
    drawblack.text((x, y), textblack, font=font36)
    drawred.text((x,y+30), textred, font=font36)

    print("displaying...")
    epd.display(epd.getbuffer(HBlackimage), epd.getbuffer(HRedimage))

# test
print("Display 1: ")
display_text(30, 40, "Hello", "World")
print("Display 2: ")
display_text(30, 40, "Greetz", "@cryptax")

# sleep
epd.sleep()
print("Display 3: ")
display_text(30, 40, "Never", "see")

[sspooner]

Can you epd.init() after your sleep ? I don't use python for my code, but in C I do EPD_Sleep() and then before I want to update the display I do an EPD_Init() again. The time between my EPD_Sleep() and EPD_Init() is about 10 minutes for me.

[cryptax]

Yes, epd.init() works. It's just that I would have expected a lighter wake up. Okay, so let's do init.