nemunaire/waveshareteam-e-Paper
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Significantly increase speed of displaying images (for 7in5b_V2)

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same a #104 but for 7in5b_v2 (also applies to v3)
This commit is contained in:
Matt Vogel 2022-01-08 20:18:22 -05:00
parent 130e685e7d
commit 5f49ab2847
1 changed files with 30 additions and 30 deletions
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60
RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd7in5b_V2.py
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@ -4,8 +4,8 @@
# * | Function : Electronic paper driver
# * | Info :
# *----------------
# * | This version: V4.1
# * | Date : 2020-11-30
# * | This version: V4.2
# * | Date : 2022-01-08
# # | Info : python demo
# -----------------------------------------------------------------------------
# Permission is hereby granted, free of charge, to any person obtaining a copy
@ -66,7 +66,13 @@ class EPD:
epdconfig.digital_write(self.cs_pin, 0)
epdconfig.spi_writebyte([data])
epdconfig.digital_write(self.cs_pin, 1)
def send_data2(self, data): #faster
epdconfig.digital_write(self.dc_pin, 1)
epdconfig.digital_write(self.cs_pin, 0)
epdconfig.SPI.writebytes2(data)
epdconfig.digital_write(self.cs_pin, 1)
def ReadBusy(self):
logger.debug("e-Paper busy")
self.send_command(0x71)
@ -127,50 +133,44 @@ class EPD:
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)
img = image
imwidth, imheight = img.size
if(imwidth == self.width and imheight == self.height):
logger.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))
img = img.convert('1')
elif(imwidth == self.height and imheight == self.width):
logger.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))
# image has correct dimensions, but needs to be rotated
img = img.rotate(90, expand=True).convert('1')
else:
logger.warning("Wrong image dimensions: must be " + str(self.width) + "x" + str(self.height))
# return a blank buffer
return [0x00] * (int(self.width/8) * self.height)
buf = bytearray(img.tobytes('raw'))
# The bytes need to be inverted, because in the PIL world 0=black and 1=white, but
# in the e-paper world 0=white and 1=black.
for i in range(len(buf)):
buf[i] ^= 0xFF
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_data2(imageblack)
self.send_command(0x13)
for i in range(0, int(self.width * self.height / 8)):
self.send_data(~imagered[i]);
self.send_data2(imagered) #this may need to be ~ inverted
self.send_command(0x12)
epdconfig.delay_ms(100)
self.ReadBusy()
def Clear(self):
buf = [0x00] * (int(self.width/8) * self.height)
buf2 = [0xff] * (int(self.width/8) * self.height)
self.send_command(0x10)
for i in range(0, int(self.width * self.height / 8)):
self.send_data(0xff)
self.send_data2(buf2)
self.send_command(0x13)
for i in range(0, int(self.width * self.height / 8)):
self.send_data(0x00)
self.send_data2(buf)
self.send_command(0x12)
epdconfig.delay_ms(100)