# HG changeset patch
# User Matt Johnston <matt@ucc.asn.au>
# Date 1355840447 -28800
# Node ID 171cdf716473a4868102b4cdb4484e5489497f00
# Parent  d686b111dab427ee764f84f8a5d6ba7086293612
lcd works

diff -r d686b111dab4 -r 171cdf716473 py/lcd.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/py/lcd.py	Tue Dec 18 22:20:47 2012 +0800
@@ -0,0 +1,77 @@
+#!/home/matt/templog/venv/bin/python
+
+import smbus
+import time
+import random
+import sys
+
+class LCD(object):
+
+    COMMAND = 0x00
+    DATA = 0x40
+
+    def __init__(self):
+        self.bus = smbus.SMBus(1)
+        #self.address = 0b0111110
+        self.address = 0x3e
+
+    def setup(self):
+        time.sleep(0.01)
+        cmds = """0x38 function set
+        0x39 function set
+        0x17 freq
+        0x78 # was 0x74 contrast, 101000 = 8 contrast (32 below), total 40
+        0x57 # was 0x54 # power/icon/contrast, 0110 = bon, c5
+        0x6a # was 0x6f follower , follow onr, rab 010 = 1.5
+        0x0c on/off"""
+        for l in cmds.split('\n'):
+            c = eval(l.split()[0])
+            self.cmd(c)
+
+#        self.cmd(0x38)
+#        self.cmd(0x39)
+#        self.cmd(0x14)
+#        self.cmd(0x78) # contrast
+#        self.cmd(0x57) # power/icon/contrast
+#        self.cmd(0x6f) # follower
+#        self.cmd(0x0c)
+#        self.cmd(0x01)
+#        self.cmd(0x04)
+
+    def put(self, pos, word):
+        addr = 0b10000000 + (pos % 16) + (pos>=16)*40
+        self.cmd(addr)
+        for char in word:
+            self.data(ord(char))
+
+    def write(self, a, b):
+        self.bus.write_byte_data(self.address, a, b)
+        time.sleep(0.0001)
+        
+    def cmd(self, cmd):
+        self.write(self.COMMAND, cmd)
+
+    def data(self, data):
+        self.write(self.DATA, data)
+
+l = LCD()
+l.setup()
+l.put(0, 'a')
+l.put(1, 'b')
+l.put(4, 'b')
+
+#words = [word.strip() for word in file('/usr/share/dict/words', 'r')]
+#random.shuffle(words)
+words = file(sys.argv[1], 'r').read().split()
+
+pos = 0
+last = ''
+for word in words:
+    word = (word + ' '*16)[:16]
+    #pos = (pos + 16) % 32
+    #word = random.sample(words, 1)[0][:16] + ' '*16
+    #char = chr(int(random.random() * 26) + ord('a'))
+    l.put(0, last)
+    l.put(16, word)
+    last = word
+    time.sleep(0.1)