restored power_up()

power_up()
* voltages
* border waveform
* RAM X/Y COUNT

had been dropped during 'z' troubleshooting, but test clean now so added back to match SSD1680 behavior.

Author: mikeysklar

adafruit_epd/ssd1680.py

@@ -247,12 +247,27 @@ def power_up(self):
             bytearray([self._height, (self._height) >> 8, 0x00]),
         )
         self.command(_SSD1680_DATA_MODE, bytearray([0x03]))
+
+        # Set voltages
+        self.command(_SSD1680_WRITE_VCOM_REG, bytearray([0x36]))
+        self.command(_SSD1680_GATE_VOLTAGE, bytearray([0x17]))
+        self.command(_SSD1680_SOURCE_VOLTAGE, bytearray([0x41, 0x00, 0x32]))
+
         self.command(_SSD1680_SET_RAMXPOS, bytearray([0x00, (self._width // 8)]))
         self.command(
             _SSD1680_SET_RAMYPOS,
             bytearray([0x00, 0x00, self._height, (self._height) >> 8]),
         )
 
+        # Set border waveform
+        self.command(_SSD1680_WRITE_BORDER, bytearray([0x05]))
+
+        # Set ram X count
+        self.command(_SSD1680_SET_RAMXCOUNT, bytearray([0x01]))
+        # Set ram Y count
+        self.command(_SSD1680_SET_RAMYCOUNT, bytearray([self._height, 0]))
+        self.busy_wait()
+
     def update(self):
         """Update the display specifically for SSD1680Z."""
         self.command(_SSD1680_DISP_CTRL2, bytearray([0xF7]))  # Full update for SSD1680Z