Adafruit_CharLCD/Adafruit_CharLCD.py: Pin change for Rev 2.0 Pi

[pdp7]

Reported by elemen14 Community member, Fergus Byrne:

http://www.element14.com/community/message/63437

The Rev 2.0 PCB has a change involving GPIO21 and GPIO27. Fergus had to modify the code from:

def init(self, pin_rs=25, pin_e=24, pins_db=[23, 17, 21, 22], GPIO = None):

to:

def init(self, pin_rs=25, pin_e=24, pins_db=[23, 17, 27, 22], GPIO = None):

[pdp7]

The RPi.GPIO actually does auto detect the Raspberry Pi revision. By switching to BOARD pin addressing instead of BCM, the code works ok on both the Rev 1 and Rev 2 Pi's.

diff --git a/Adafruit_CharLCD/Adafruit_CharLCD.py b/Adafruit_CharLCD/Adafruit_CharLCD.py
index bbb8955..aef9556 100755
--- a/Adafruit_CharLCD/Adafruit_CharLCD.py
+++ b/Adafruit_CharLCD/Adafruit_CharLCD.py
@@ -54,17 +54,21 @@ class Adafruit_CharLCD:
 
 
 
-    def __init__(self, pin_rs=25, pin_e=24, pins_db=[23, 17, 21, 22], GPIO = None):
+    #def __init__(self, pin_rs=25, pin_e=24, pins_db=[23, 17, 27, 22], GPIO = None):
+    def __init__(self, pin_rs=22, pin_e=18, pins_db=[16, 11, 13, 15], GPIO = None):
+        
        # Emulate the old behavior of using RPi.GPIO if we haven't been given
        # an explicit GPIO interface to use
        if not GPIO:
            import RPi.GPIO as GPIO
        self.GPIO = GPIO
+        self.GPIO.setwarnings(False)
         self.pin_rs = pin_rs
         self.pin_e = pin_e
         self.pins_db = pins_db
 
-        self.GPIO.setmode(GPIO.BCM)
+       self.GPIO.setmode(GPIO.BOARD)
+        #self.GPIO.setmode(GPIO.BCM)
         self.GPIO.setup(self.pin_e, GPIO.OUT)
         self.GPIO.setup(self.pin_rs, GPIO.OUT)

[ladyada]

we added a note to the tutorial and the code about the pin change - the cobbler has BCM pinout so we want to keep it with BCM :)