Test script for HD44780 LCD connected to RPI via 'i2c / SPI character LCD backpack'

[0x8000-0000]

I have connected a HD44780 compatible LCD to a Raspberry Pi (revB) using the 'i2c / SPI character LCD backpack' from Adafruit.

Using the library, I created the following test script:

   #!/usr/bin/python

   from Adafruit_CharLCD import Adafruit_CharLCD
   from Adafruit_MCP230xx import MCP230XX_GPIO

   mcp = MCP230XX_GPIO(1, 0x20, 8)
   lcd = Adafruit_CharLCD(pin_rs=1, pin_e=2, pins_db=[3,4,5,6], GPIO=mcp)

   lcd.clear()
   lcd.message("  Adafruit 16x2\n  Standard LCD")

Note: the following patch needs to be applied to Adafruit_MCP230xx.py:

diff --git a/Adafruit_MCP230xx/Adafruit_MCP230xx.py b/Adafruit_MCP230xx/Adafruit_MCP230xx.py
index 19bc372..cbad92d 100755
--- a/Adafruit_MCP230xx/Adafruit_MCP230xx.py
+++ b/Adafruit_MCP230xx/Adafruit_MCP230xx.py
@@ -185,7 +185,7 @@ class MCP230XX_GPIO(object):
     BOARD = 0

     def __init__(self, busnum, address, num_gpios):
-        self.chip = Adafruit_MCP230XX(busnum, address, num_gpios)
+        self.chip = Adafruit_MCP230XX(address, num_gpios, busnum)
     def setmode(self, mode):
         pass # do nothing
     def setup(self, pin, mode):

[tdicola]

Thanks for suggesting the example--I agree it's a nifty way to show how the MCP230xx GPIO class works. I just integrated the example in a commit so this should be resolved. Thanks!