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Use old buffer write for greyscale.

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Previously we used the fact that an update will have the effect, at
the end, of copying the new bitmap to the old bitmap. The next update
would use old/new bits difference to understand if the change it's
WW, BB, WB, BW. However we can set the old framebuffer directly as
per datasheet. The previous system worked, but was kinda of a hack.
This commit is contained in:
antirez
2024-03-17 22:04:26 +01:00
parent df6fcd0f87
commit 93665cd85f
1 changed files with 3 additions and 18 deletions
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21
uc8151.py
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@@ -705,27 +705,14 @@ class UC8151:
# the four set of conditions (WW, BB, WB, BW) based
# on the difference between the bits in the two
# images.
#
# This is a "fake" update that should not do nothing
# if not to refresh the display status of what was
# previously on the screen, so we set a repeat of 0.
LUT[5] = 1 # Repeat 1 for all
LUT[0] = 0x55 # Go black
LUT[1] = 0 # Zero frames, fake update.
VCOM[1] = LUT[1]
self.write(CMD_LUT_VCOM,VCOM)
self.write(CMD_LUT_WW,LUT)
self.write(CMD_LUT_BB,LUT)
self.write(CMD_LUT_WB,LUT)
self.write(CMD_LUT_BW,LUT)
self.update(fb=fb2,blocking=True)
self.send_image(fb2,old=True)
# We set the framebuffer with just the pixels of the level
# of grey we are handling in this cycle, so now we apply
# the voltage for a time proportional to this level (see
# the setting of LUT[1], that is the number of frames).
LUT[0] = 0x55 # Go black
LUT[5] = 1 # Repeat 1 for all
LUT[1] = int(frames_to_black/greyscale*(g+1))
self.write(CMD_LUT_WW,LUT)
LUT[1] = int(frames_to_black/greyscale*(g+2))
@@ -785,8 +772,6 @@ if __name__ == "__main__":
#eink.load_greyscale_image("dama.grey")
eink.load_greyscale_image("hopper.grey")
time.sleep(1)
eink.fade_out()
STOP
# eink.set_handmade_lut()