#import

import RPi.GPIO as GPIO

import time

 

# Define GPIO to LCD mapping

LCD_RS = 18

LCD_E  = 23

LCD_D4 = 24

LCD_D5 = 5

LCD_D6 = 6

LCD_D7 = 7

 

LCD_WIDTH = 16    

LCD_CHR = True

LCD_CMD = False

 

LCD_LINE_1 = 0x80 

LCD_LINE_2 = 0xC0 

 

E_PULSE = 0.0005

E_DELAY = 0.0005

 

def main():

 

  GPIO.setwarnings(False)

  GPIO.setmode(GPIO.BCM)       

  GPIO.setup(LCD_E, GPIO.OUT)  

  GPIO.setup(LCD_RS, GPIO.OUT) 

  GPIO.setup(LCD_D4, GPIO.OUT) 

  GPIO.setup(LCD_D5, GPIO.OUT) 

  GPIO.setup(LCD_D6, GPIO.OUT) 

  GPIO.setup(LCD_D7, GPIO.OUT) 

 

  lcd_init()

 

  while True:

 

    lcd_string("Rasbperry Pi",LCD_LINE_1)

    lcd_string("16x2 LCD Test",LCD_LINE_2)

 

    time.sleep(3) 

 

    lcd_string("1234567890123456",LCD_LINE_1)

    lcd_string("abcdefghijklmnop",LCD_LINE_2)

 

    time.sleep(3) 

 

    lcd_string("RaspberryPi-spy",LCD_LINE_1)

    lcd_string(".co.uk",LCD_LINE_2)

 

    time.sleep(3)

 

    lcd_string("Follow me on",LCD_LINE_1)

    lcd_string("Twitter @RPiSpy",LCD_LINE_2)

 

    time.sleep(3)

 

def lcd_init():

  

  lcd_byte(0x33,LCD_CMD) 

  lcd_byte(0x32,LCD_CMD) 

  lcd_byte(0x06,LCD_CMD) 

  lcd_byte(0x0C,LCD_CMD) 

  lcd_byte(0x28,LCD_CMD) 

  lcd_byte(0x01,LCD_CMD) 

  time.sleep(E_DELAY)

 

def lcd_byte(bits, mode):

 

  GPIO.output(LCD_RS, mode) 



  GPIO.output(LCD_D4, False)

  GPIO.output(LCD_D5, False)

  GPIO.output(LCD_D6, False)

  GPIO.output(LCD_D7, False)

  if bits&0x10==0x10:

    GPIO.output(LCD_D4, True)

  if bits&0x20==0x20:

    GPIO.output(LCD_D5, True)

  if bits&0x40==0x40:

    GPIO.output(LCD_D6, True)

  if bits&0x80==0x80:

    GPIO.output(LCD_D7, True)

 

  lcd_toggle_enable()

 

  GPIO.output(LCD_D4, False)

  GPIO.output(LCD_D5, False)

  GPIO.output(LCD_D6, False)

  GPIO.output(LCD_D7, False)

  if bits&0x01==0x01:

    GPIO.output(LCD_D4, True)

  if bits&0x02==0x02:

    GPIO.output(LCD_D5, True)

  if bits&0x04==0x04:

    GPIO.output(LCD_D6, True)

  if bits&0x08==0x08:

    GPIO.output(LCD_D7, True)

 

  lcd_toggle_enable()

 

def lcd_toggle_enable():

  

  time.sleep(E_DELAY)

  GPIO.output(LCD_E, True)

  time.sleep(E_PULSE)

  GPIO.output(LCD_E, False)

  time.sleep(E_DELAY)

 

def lcd_string(message,line):

 

  message = message.ljust(LCD_WIDTH," ")

 

  lcd_byte(line, LCD_CMD)

 

  for i in range(LCD_WIDTH):

    lcd_byte(ord(message[i]),LCD_CHR)

 

if __name__ == '__main__':

 

  try:

    main()

  except KeyboardInterrupt:

    pass

  finally:

    lcd_byte(0x01, LCD_CMD)

    lcd_string("Goodbye!",LCD_LINE_1)

    GPIO.cleanup()