Merge pull request #13 from prcutler/root-group-fix

Update to use fourwire and root_group for CP 9 compatibility

Author: dhalbert

README.rst

@@ -70,6 +70,7 @@ Usage Example
     import time
     import board
     import displayio
+    import fourwire
     import adafruit_ssd1681
 
     displayio.release_displays()
@@ -81,7 +82,7 @@ Usage Example
     epd_reset = board.D5
     epd_busy = board.D6
 
-    display_bus = displayio.FourWire(
+    display_bus = fourwire.FourWire(
         spi, command=epd_dc, chip_select=epd_cs, reset=epd_reset, baudrate=1000000
     )
     time.sleep(1)
@@ -105,7 +106,7 @@ Usage Example
 
     g.append(t)
 
-    display.show(g)
+    display.root_group = g
 
     display.refresh()
     print("refreshed")

examples/ssd1681_four_corners.py

@@ -13,6 +13,7 @@
 import board
 import busio
 import displayio
+import fourwire
 import terminalio
 import adafruit_ssd1681
 
@@ -27,7 +28,7 @@
 epd_reset = board.EPD_RESET
 epd_busy = board.EPD_BUSY
 
-display_bus = displayio.FourWire(
+display_bus = fourwire.FourWire(
     spi, command=epd_dc, chip_select=epd_cs, reset=epd_reset, baudrate=1000000
 )
 display = adafruit_ssd1681.SSD1681(
@@ -42,7 +43,7 @@
 
 # Make the display context
 main_group = displayio.Group()
-display.show(main_group)
+display.root_group = main_group
 
 palette = displayio.Palette(2)
 palette[0] = 0x000000

examples/ssd1681_simpletest.py

@@ -12,6 +12,7 @@
 import time
 import board
 import displayio
+import fourwire
 import adafruit_ssd1681
 
 displayio.release_displays()
@@ -23,7 +24,7 @@
 epd_reset = board.D5
 epd_busy = board.D6
 
-display_bus = displayio.FourWire(
+display_bus = fourwire.FourWire(
     spi, command=epd_dc, chip_select=epd_cs, reset=epd_reset, baudrate=1000000
 )
 time.sleep(1)
@@ -49,7 +50,7 @@
     # t = displayio.TileGrid(pic, pixel_shader=pic.pixel_shader)
     g.append(t)
 
-    display.show(g)
+    display.root_group = g
 
     display.refresh()