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gu300.py
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"""
User mode device driver for Noritake GU300-series Vacuum Fluorescent Displays.
Copyright (c) 2006 [email protected]
This file is released under the GNU Lesser General Public Licence.
See the file LICENSE for details.
"""
DISPLAY_MODE_GRAPHIC = 1
DISPLAY_MODE_CHARACTER = 0
ENABLE_SCREEN_1 = 1
ENABLE_SCREEN_2 = 2
class GU300(object):
def init(self):
self.setWR(0)
self.setBrightness(100)
self.setDisplayStartAddress(screen1=0x0000, screen2=0x1000)
self.setCursorAddress(0)
self.writeData('\x00' * 0x2000)
self.setCursorAddress(0)
self.reset()
def reset(self):
self.enableScreen(ENABLE_SCREEN_1 | ENABLE_SCREEN_2)
self.selectDisplayMode(DISPLAY_MODE_GRAPHIC)
def enableScreen(self, mode):
self.sendCommand(mode)
def setDisplayStartAddress(self, screen1=0, screen2=0):
self.sendCommand(0xA)
self.sendData(chr(screen1%256))
self.sendCommand(0xB)
self.sendData(chr(screen1/256))
self.sendCommand(0xC)
self.sendData(chr(screen2%256))
self.sendCommand(0xD)
self.sendData(chr(screen2/256))
def selectDisplayMode(self, mode):
self.sendCommand(0x6 + mode)
def writeData(self, data):
self.sendCommand(0x8)
self.sendData(data)
self.setCS(1)
def setCursorAddress(self, address):
self.sendCommand(0xE)
self.sendData(chr(address%256))
self.sendCommand(0xF)
self.sendData(chr((address/256) & 0x1F))
def setBrightness(self, level):
if level <= 62.5: self.sendCommand(0x1b)
elif level <= 75.0: self.sendCommand(0x1a)
elif level <= 87.5: self.sendCommand(0x19)
else: self.sendCommand(0x18)
try:
import parallel # http://pyserial.sourceforge.net/pyparallel
class GU300Parallel(GU300):
def __init__(self, W=256, H=64, dev=0, fastwrite=True):
p = parallel.Parallel(dev)
self.setWR = p.setDataStrobe # pin 1
self.setCD = p.setAutoFeed # pin 14
self.setRD = p.setInitOut # pin 16
self.setCS = p.setSelect # pin 17
self.setRD(1)
self.setData = p.setData # pins 2-9
self.W = W
self.H = H
# enable the fast write if using the default wiring and the C library is installed
self.sendData = self.slowData
if fastwrite:
try:
assert self.setWR == p.setDataStrobe
assert self.setCD == p.setAutoFeed
from ctypes import cdll
from sys import prefix
self._pydisplay = cdll.LoadLibrary(prefix + '/lib/python/site-packages/_pydisplay.so')
self.fd = p._fd
self.sendData = self.fastData
print 'gu300: using fast I/O library'
except:
self.sendData = self.slowData
print 'gu300: fast I/O library not available, using pyparallel'
self.init()
def sendCommand(self, cmd):
self.setCS(0)
self.setCD(1)
self.setData(cmd)
self.setWR(0)
self.setWR(1)
def slowData(self, data):
self.setCS(0)
self.setCD(0)
for d in data:
self.setData(ord(d))
self.setWR(0)
self.setWR(1)
def fastData(self, data):
self._pydisplay.gu300_write(self.fd, data, len(data))
except: print 'GU300 parallel not available'
if __name__ == '__main__':
import time
d = GU300Parallel(dev=2, fastwrite=True)
d.setBrightness(100)
pattern = ( ('\x55'*8) + ('\xaa'*8) ) * 128
#pattern = '\xff' * 2048
d.writeData(pattern)
time.sleep(2)
d.setCursorAddress(0)
pattern = '\xff'*8 + ( '\x80' + '\x00'*6 + '\x01' ) * 254 + '\xff'*8
d.writeData(pattern)
time.sleep(2)
d.writeData('\x00'*0x2000)