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fix: epd2in13_V4 displayPartial ghosting due to missing 0x26 buffer update #416

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fix: epd2in13_V4 displayPartial ghosting due to missing 0x26 buffer update #416

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23 changes: 19 additions & 4 deletions RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd2in13_V4.py
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,7 @@ def __init__(self):
self.cs_pin = epdconfig.CS_PIN
self.width = EPD_WIDTH
self.height = EPD_HEIGHT
self._prev_buffer: bytearray | list | None = None # Reference buffer for differential partial refresh

'''
function :Hardware reset
Expand Down Expand Up @@ -267,8 +268,11 @@ def getbuffer(self, image):
'''
def display(self, image):
self.send_command(0x24)
self.send_data2(image)
self.send_data2(image)
self.send_command(0x26)
self.send_data2(image)
self.TurnOnDisplay()
self._prev_buffer = image # Keep buffer in sync

'''
function : Sends the image buffer in RAM to e-Paper and fast displays
Expand All @@ -277,8 +281,11 @@ def display(self, image):
'''
def display_fast(self, image):
self.send_command(0x24)
self.send_data2(image)
self.send_data2(image)
self.send_command(0x26)
self.send_data2(image)
self.TurnOnDisplay_Fast()
self._prev_buffer = image # Keep buffer in sync
'''
function : Sends the image buffer in RAM to e-Paper and partial refresh
parameter:
Expand All @@ -303,9 +310,15 @@ def displayPartial(self, image):
self.SetWindow(0, 0, self.width - 1, self.height - 1)
self.SetCursor(0, 0)

self.send_command(0x24) # WRITE_RAM
self.send_data2(image)
self.send_command(0x26) # Write previous image to RAM for differential refresh
prev = self._prev_buffer if self._prev_buffer is not None else image
self.send_data2(prev)

self.send_command(0x24) # Write new image to RAM
self.send_data2(image)

self.TurnOnDisplayPart()
self._prev_buffer = image # Save for next partial refresh

'''
function : Refresh a base image
Expand All @@ -319,6 +332,7 @@ def displayPartBaseImage(self, image):
self.send_command(0x26)
self.send_data2(image)
self.TurnOnDisplay()
self._prev_buffer = image # Keep buffer in sync

'''
function : Clear screen
Expand All @@ -334,6 +348,7 @@ def Clear(self, color=0xFF):
self.send_command(0x24)
self.send_data2([color] * int(self.height * linewidth))
self.TurnOnDisplay()
self._prev_buffer = [color] * int(self.height * linewidth) # Keep buffer in sync

'''
function : Enter sleep mode
Expand Down