usr/bin/dispchar

   1 #!/usr/bin/python
   2 import time
   3 import sys
   4 import RPi.GPIO as GPIO
   5 GPIO.setwarnings(False)
   6
   7 # Zuordnung der GPIO Pins (ggf. anpassen)
   8 DISPLAY_RS = 7
   9 DISPLAY_E  = 8
  10 DISPLAY_DATA4 = 25
  11 DISPLAY_DATA5 = 24
  12 DISPLAY_DATA6 = 23
  13 DISPLAY_DATA7 = 18
  14
  15 DISPLAY_WIDTH = 16      # Zeichen je Zeile
  16 DISPLAY_LINE_1 = 0x80   # Adresse der ersten Display Zeile
  17 DISPLAY_LINE_2 = 0xC0
  18
  19 DISPLAY_CHR = True
  20 DISPLAY_CMD = False
  21 E_PULSE = 0.0005
  22 E_DELAY = 0.0005
  23
  24 def main():
  25         GPIO.setmode(GPIO.BCM)
  26         GPIO.setup(DISPLAY_E, GPIO.OUT)
  27         GPIO.setup(DISPLAY_RS, GPIO.OUT)
  28         GPIO.setup(DISPLAY_DATA4, GPIO.OUT)
  29         GPIO.setup(DISPLAY_DATA5, GPIO.OUT)
  30         GPIO.setup(DISPLAY_DATA6, GPIO.OUT)
  31         GPIO.setup(DISPLAY_DATA7, GPIO.OUT)
  32
  33 #       display_init()
  34
  35         lcd_byte (0x0c, DISPLAY_CMD) #cursor off
  36         if len (sys.argv) > 1:
  37                 message = sys.argv[1]
  38                 lcd_byte(ord(message[0]),DISPLAY_CHR)
  39                 lcd_byte (0x10, DISPLAY_CMD) #shift curpos left
  40                 #mychar = ord(sys.argv[1])
  41                 #print (mychar)
  42                 #lcd_byte (mychar, DISPLAY_CMD)
  43 #               lcd_string (mystring[0:8])
  44 #               lcd_byte (DISPLAY_LINE_2, DISPLAY_CMD)
  45 #               lcd_string (mystring[8:16])
  46
  47
  48 def display_init():
  49         lcd_byte(0x33,DISPLAY_CMD)
  50         lcd_byte(0x32,DISPLAY_CMD)
  51         lcd_byte(0x28,DISPLAY_CMD)
  52         lcd_byte(0x0C,DISPLAY_CMD)
  53         #lcd_byte(0x06,DISPLAY_CMD) #advance cursor
  54         #lcd_byte(0x01,DISPLAY_CMD)  #clear display
  55
  56 def lcd_string(message):
  57         message = message.ljust(DISPLAY_WIDTH," ")
  58         for i in range(DISPLAY_WIDTH):
  59           lcd_byte(ord(message[i]),DISPLAY_CHR)
  60
  61 def lcd_byte(bits, mode):
  62         GPIO.output(DISPLAY_RS, mode)
  63         GPIO.output(DISPLAY_DATA4, False)
  64         GPIO.output(DISPLAY_DATA5, False)
  65         GPIO.output(DISPLAY_DATA6, False)
  66         GPIO.output(DISPLAY_DATA7, False)
  67         if bits&0x10==0x10:
  68           GPIO.output(DISPLAY_DATA4, True)
  69         if bits&0x20==0x20:
  70           GPIO.output(DISPLAY_DATA5, True)
  71         if bits&0x40==0x40:
  72           GPIO.output(DISPLAY_DATA6, True)
  73         if bits&0x80==0x80:
  74           GPIO.output(DISPLAY_DATA7, True)
  75         time.sleep(E_DELAY)
  76         GPIO.output(DISPLAY_E, True)
  77         time.sleep(E_PULSE)
  78         GPIO.output(DISPLAY_E, False)
  79         time.sleep(E_DELAY)
  80         GPIO.output(DISPLAY_DATA4, False)
  81         GPIO.output(DISPLAY_DATA5, False)
  82         GPIO.output(DISPLAY_DATA6, False)
  83         GPIO.output(DISPLAY_DATA7, False)
  84         if bits&0x01==0x01:
  85           GPIO.output(DISPLAY_DATA4, True)
  86         if bits&0x02==0x02:
  87           GPIO.output(DISPLAY_DATA5, True)
  88         if bits&0x04==0x04:
  89           GPIO.output(DISPLAY_DATA6, True)
  90         if bits&0x08==0x08:
  91           GPIO.output(DISPLAY_DATA7, True)
  92         time.sleep(E_DELAY)
  93         GPIO.output(DISPLAY_E, True)
  94         time.sleep(E_PULSE)
  95         GPIO.output(DISPLAY_E, False)
  96         time.sleep(E_DELAY)
  97
  98 if __name__ == '__main__':
  99         main()
 100