diff options
Diffstat (limited to 'pyparallel/examples/lcd.py')
| -rw-r--r-- | pyparallel/examples/lcd.py | 70 |
1 files changed, 4 insertions, 66 deletions
diff --git a/pyparallel/examples/lcd.py b/pyparallel/examples/lcd.py index 8e1c66b..b56c2a5 100644 --- a/pyparallel/examples/lcd.py +++ b/pyparallel/examples/lcd.py @@ -5,7 +5,7 @@ # this is distributed under a free software license, see license.txt import sys, time -sys.path.insert(0, '..') +sys.path.append('..') import parallel LCDON = 0x01 #0x00000001 Switch on display @@ -31,8 +31,9 @@ LCD_D6 = 1<<6 LCD_D7 = 1<<7 -class FourBitIO(object): +class LCD: def __init__(self): + self.p = parallel.Parallel() self.data = 0 self.out(0) #reset pins @@ -96,69 +97,6 @@ class FourBitIO(object): self.toggleE() #toggle LCD_E, the enable pin time.sleep(0.001) #wait until instr is finished - -class EightBitIO(object): - def __init__(self): - self.data = 0 - - self.setRS(0) - self.setRW(0) - self.out(0) #reset pins - time.sleep(0.050) #wait more than 30ms - #send the reset sequece (3 times the same pattern) - self.out(LCD8BITS) #set 8 bit interface - self.toggleE() #toggle LCD_E, the enable pin - time.sleep(0.005) #wait a bit - self.toggleE() #toggle LCD_E, the enable pin - time.sleep(0.005) #wait a bit - self.toggleE() #toggle LCD_E, the enable pin - time.sleep(0.005) #wait a bit - - #~ self.instr(LCD2LINES) #set 2 lines display - self.instr(LCDCURSOROFF) #hide cursor - self.instr(LCDCLEAR) #clear display - - def setRW(self, state): - self.p.setAutoFeed(state) - - def setRS(self, state): - self.p.setInitOut(state) - - def toggleE(self): - """toggle enable pin""" - self.p.setDataStrobe(1) #toggle LCD_E, the enable pin - #~ time.sleep(0.001) - self.p.setDataStrobe(0) #back to inactive position - #~ time.sleep(0.001) - - def out(self, data): - """set data to LCD port""" - self.data = data - self.p.setData(self.data) - - def instr(self, cmd): - """send instruction byte to LCD""" - self.setRS(0) - self.setRW(0) - self.out(cmd) - self.toggleE() #toggle LCD_E, the enable pin - time.sleep(0.005) #wait until instr is finished - - def putc(self, c): - """send a data byte to the LCD""" - self.setRS(1) - self.setRW(0) - self.out(ord(c)) - self.toggleE() #toggle LCD_E, the enable pin - time.sleep(0.001) #wait until instr is finished - - -#~ class HD44780(FourBitIO): -class HD44780(EightBitIO): - def __init__(self): - self.p = parallel.Parallel() - super(HD44780, self).__init__() - def write(self, str): """write a string to the LCD""" for c in str: @@ -171,7 +109,7 @@ class HD44780(EightBitIO): self.instr(LCDLINE1) #just in case, set cursor to a visible pos if __name__ == '__main__': - lcd = HD44780() + lcd = LCD() lcd.write("Hello World") lcd.instr(LCDLINE2) lcd.write("from Python") |