Merge pull request #52 from chadkuester/patch-1

Update charlcd_rpi_rgb_simpletest.py

examples/charlcd_rpi_rgb_simpletest.py

@@ -10,18 +10,24 @@
 lcd_rows = 2
 
 # Raspberry Pi Pin Config:
-lcd_rs = digitalio.DigitalInOut(board.D26)  # pin 4
-lcd_en = digitalio.DigitalInOut(board.D19)  # pin 6
-lcd_d7 = digitalio.DigitalInOut(board.D27)  # pin 14
-lcd_d6 = digitalio.DigitalInOut(board.D22)  # pin 13
-lcd_d5 = digitalio.DigitalInOut(board.D24)  # pin 12
-lcd_d4 = digitalio.DigitalInOut(board.D25)  # pin 11
+lcd_rs = digitalio.DigitalInOut(board.D26)  # LCD pin 4
+lcd_en = digitalio.DigitalInOut(board.D19)  # LCD pin 6
+lcd_d7 = digitalio.DigitalInOut(board.D27)  # LCD pin 14
+lcd_d6 = digitalio.DigitalInOut(board.D22)  # LCD pin 13
+lcd_d5 = digitalio.DigitalInOut(board.D24)  # LCD pin 12
+lcd_d4 = digitalio.DigitalInOut(board.D25)  # LCD pin 11
+lcd_rw = digitalio.DigitalInOut(
+    board.D4
+)  # LCD pin 5.  Determines whether to read to or write from the display.
+# Not necessary if only writing to the display. Used on shield.
 
 red = pulseio.PWMOut(board.D21)
 green = pulseio.PWMOut(board.D12)
 blue = pulseio.PWMOut(board.D18)
 
-# Initialise the LCD class
+# Initialize the LCD class
+# The lcd_rw parameter is optional.  You can omit the line below if you're only
+# writing to the display.
 lcd = characterlcd.Character_LCD_RGB(
     lcd_rs,
     lcd_en,
@@ -34,6 +40,7 @@
     red,
     green,
     blue,
+    lcd_rw,
 )
 
 RED = [100, 0, 0]