Displayclass

#!/usr/bin/python
import time
import RPi.GPIO as GPIO

# Zuordnung der GPIO Pins (ggf. anpassen)
DISPLAY_RS = 7
DISPLAY_E  = 8
DISPLAY_DATA4 = 25
DISPLAY_DATA5 = 24
DISPLAY_DATA6 = 23
DISPLAY_DATA7 = 18




DISPLAY_WIDTH = 16  # Zeichen je Zeile
DISPLAY_LINE_1 = 0x80   # Adresse der ersten Display Zeile
DISPLAY_LINE_2 = 0xC0   # Adresse der zweiten Display Zeile
DISPLAY_LINE_3 = 0x94
DISPLAY_LINE_4 = 0xD4
DISPLAY_CHR = True
DISPLAY_CMD = False
E_PULSE = 0.00005
E_DELAY = 0.00005

def main():
    GPIO.setmode(GPIO.BCM)
    GPIO.setup(DISPLAY_E, GPIO.OUT)
    GPIO.setup(DISPLAY_RS, GPIO.OUT)
    GPIO.setup(DISPLAY_DATA4, GPIO.OUT)
    GPIO.setup(DISPLAY_DATA5, GPIO.OUT)
    GPIO.setup(DISPLAY_DATA6, GPIO.OUT)
    GPIO.setup(DISPLAY_DATA7, GPIO.OUT)

    display_init()






def display_init():
    lcd_byte(0x33,DISPLAY_CMD)
    lcd_byte(0x32,DISPLAY_CMD)
    lcd_byte(0x28,DISPLAY_CMD)
    lcd_byte(0x0C,DISPLAY_CMD)
    lcd_byte(0x06,DISPLAY_CMD)
    lcd_byte(0x01,DISPLAY_CMD)

def lcd_string(message):
    message = message.ljust(DISPLAY_WIDTH," ")
    for i in range(DISPLAY_WIDTH):
      lcd_byte(ord(message[i]),DISPLAY_CHR)

def lcd_byte(bits, mode):
    GPIO.output(DISPLAY_RS, mode)
    GPIO.output(DISPLAY_DATA4, False)
    GPIO.output(DISPLAY_DATA5, False)
    GPIO.output(DISPLAY_DATA6, False)
    GPIO.output(DISPLAY_DATA7, False)
    if bits&0x10==0x10:
      GPIO.output(DISPLAY_DATA4, True)
    if bits&0x20==0x20:
      GPIO.output(DISPLAY_DATA5, True)
    if bits&0x40==0x40:
      GPIO.output(DISPLAY_DATA6, True)
    if bits&0x80==0x80:
      GPIO.output(DISPLAY_DATA7, True)
    time.sleep(E_DELAY)
    GPIO.output(DISPLAY_E, True)
    time.sleep(E_PULSE)
    GPIO.output(DISPLAY_E, False)
    time.sleep(E_DELAY)
    GPIO.output(DISPLAY_DATA4, False)
    GPIO.output(DISPLAY_DATA5, False)
    GPIO.output(DISPLAY_DATA6, False)
    GPIO.output(DISPLAY_DATA7, False)
    if bits&0x01==0x01:
      GPIO.output(DISPLAY_DATA4, True)
    if bits&0x02==0x02:
      GPIO.output(DISPLAY_DATA5, True)
    if bits&0x04==0x04:
      GPIO.output(DISPLAY_DATA6, True)
    if bits&0x08==0x08:
      GPIO.output(DISPLAY_DATA7, True)
    time.sleep(E_DELAY)
    GPIO.output(DISPLAY_E, True)
    time.sleep(E_PULSE)
    GPIO.output(DISPLAY_E, False)
    time.sleep(E_DELAY)

def show(a,b,c,d)
    lcd_byte(DISPLAY_LINE_1, DISPLAY_CMD)
    lcd_string(a)
    lcd_byte(DISPLAY_LINE_2, DISPLAY_CMD)
    lcd_string(b)
    lcd_byte(DISPLAY_LINE_3, DISPLAY_CMD)
    lcd_string(c)
    lcd_byte(DISPLAY_LINE_4, DISPLAY_CMD)
    lcd_string(d)

if __name__ == '__main__':
    main()