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Diffstat (limited to 'pyparallel/examples/lcd.py')
| -rw-r--r-- | pyparallel/examples/lcd.py | 120 |
1 files changed, 0 insertions, 120 deletions
diff --git a/pyparallel/examples/lcd.py b/pyparallel/examples/lcd.py deleted file mode 100644 index b56c2a5..0000000 --- a/pyparallel/examples/lcd.py +++ /dev/null @@ -1,120 +0,0 @@ -#!/usr/bin/env python -# character LCD example for pyparallel -# -#(C) 2002 Chris Liechti <cliechti@gmx.net> -# this is distributed under a free software license, see license.txt - -import sys, time -sys.path.append('..') -import parallel - -LCDON = 0x01 #0x00000001 Switch on display -LCDOFF = 0x08 #0x00001000 Switch off display -LCDCLEAR = 0x01 #0x00000001 -LCDLINE1 = 0x80 #0x10000000 -LCDLINE2 = 0xc0 #0x11000000 -LCDCURSORON = 0x0f #0x00001111 turn on cursor blinking -LCDCURSOROFF = 0x0c #0x00001100 Disable cursor blinking. The cursor is hidden. -LCDCGADRSET = 0x40 #0b01000000 -LCDDDADRSET = 0x80 #0b10000000 -LCD2LINES = 0x28 #0b00101000 Set display mode to two lines. -LCD8BITS = 0x30 #0b00110000 select 8 Bit interface -LCD4BITS = 0x20 #0b00100000 select 4 Bit interface -LCD_DATA_OFF = 0x05 #0x00000101 mask used to clear the data lines - -LCD_RS = 1<<1 -LCD_RW = 1<<2 -LCD_E = 1<<3 -LCD_D4 = 1<<4 -LCD_D5 = 1<<5 -LCD_D6 = 1<<6 -LCD_D7 = 1<<7 - - -class LCD: - def __init__(self): - self.p = parallel.Parallel() - self.data = 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.out(LCD4BITS) #now set up the 4 bit interface - self.toggleE() #toggle LCD_E, the enable pin - time.sleep(0.002) #wait until instr is finished - self.instr(LCD2LINES) #set 2 lines display - self.instr(LCDCURSOROFF) #hide cursor - self.instr(LCDCLEAR) #clear display - - #my connector has the wrong pinorder.... - #better swap them in software than to solder ;-) - def reveseout(self, x): - r = ((x & (1<<0) and 1) << 7) |\ - ((x & (1<<1) and 1) << 6) |\ - ((x & (1<<2) and 1) << 5) |\ - ((x & (1<<3) and 1) << 4) |\ - ((x & (1<<4) and 1) << 3) |\ - ((x & (1<<5) and 1) << 2) |\ - ((x & (1<<6) and 1) << 1) |\ - ((x & (1<<7) and 1) << 0) - #print "%02x" % r, "%02x" %x - self.p.setData(r) - - def toggleE(self): - """toggle enable pin""" - self.data |= LCD_E; #toggle LCD_E, the enable pin - self.reveseout(self.data) - self.data &= ~LCD_E; #back to inactive position - self.reveseout(self.data) - - def out(self, data): - """set data to LCD port""" - self.data = data - self.reveseout(self.data) - - def instr(self, cmd): - """send instruction byte to LCD""" - self.out(cmd & 0xf0) #output upper nibble - self.toggleE() #toggle LCD_E, the enable pin - self.out((cmd << 4) & 0xf0) #and then the lower nibble - self.toggleE() #toggle LCD_E, the enable pin - time.sleep(0.001) #wait until instr is finished - - def putc(self, c): - """send a data byte to the LCD""" - c = ord(c) - self.out((c & 0xf0) | LCD_RS) #output upper nibble - self.toggleE() #toggle LCD_E, the enable pin - self.out(((c << 4) & 0xf0) | LCD_RS) #and then the lower nibble - self.toggleE() #toggle LCD_E, the enable pin - time.sleep(0.001) #wait until instr is finished - - def write(self, str): - """write a string to the LCD""" - for c in str: - self.putc(c) #write each character - - def downloadFont(self, fontdata): - """Set the memory pointer and download a font""" - self.instr(LCDCGADRSET); - self.write(fontdata) - self.instr(LCDLINE1) #just in case, set cursor to a visible pos - -if __name__ == '__main__': - lcd = LCD() - lcd.write("Hello World") - lcd.instr(LCDLINE2) - lcd.write("from Python") -## for c in map(chr,range(256)): -## lcd.instr(LCDLINE1) -## lcd.write(c) - -
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