from machine import Pin
import utime
import time

LCD_RS = 0
LCD_E = 1
LCD_D4 = 2
LCD_D5 = 3
LCD_D6= 4
LCD_D7 = 5

LCD_WIDTH = 16
LCD_CHR = 1
LCD_CMD = 0

LCD_LINE_1 = 0x80
LCD_LINE_2 = 0xC0

def main():
    
    Pin(LCD_RS,Pin.OUT)
    Pin(LCD_E,Pin.OUT)
    Pin(LCD_D4,Pin.OUT)
    Pin(LCD_D5,Pin.OUT)
    Pin(LCD_D6,Pin.OUT)
    Pin(LCD_D7,Pin.OUT)
    
    lcd_init()    
    while True:

        lcd_byte(0x80, LCD_CMD)
        lcd_byte(ord("g"),LCD_CHR)
        lcd_byte(ord("o"),LCD_CHR)
        lcd_byte(ord("o"),LCD_CHR)
        lcd_byte(ord("d"),LCD_CHR)
        lcd_byte(ord("b"),LCD_CHR)
        lcd_byte(ord("y"),LCD_CHR)
        lcd_byte(ord("e"),LCD_CHR)
        lcd_byte(0xC0, LCD_CMD)
        lcd_byte(ord("h"),LCD_CHR)
        lcd_byte(ord("e"),LCD_CHR)
        lcd_byte(ord("l"),LCD_CHR)
        lcd_byte(ord("l"),LCD_CHR)
        lcd_byte(ord("o"),LCD_CHR)
        
        time.sleep(3)

def lcd_init():
    lcd_byte(0x33,LCD_CMD) # 110011 Initialise
    lcd_byte(0x32,LCD_CMD) # 110010 Initialise
    lcd_byte(0x06,LCD_CMD) # 000110 Cursor move direction 
    lcd_byte(0x0C,LCD_CMD) # 001100 Display On,Cursor Off, Blink Off
    lcd_byte(0x28,LCD_CMD) # 101000 Data length, number of lines, font size
    lcd_byte(0x01,LCD_CMD)  # 000001 Clear display
    time.sleep(0.0005)
    
def lcd_byte(bits,mode):
  
    if mode==0:
        Pin(LCD_RS,Pin.OUT).low()
    else:
        Pin(LCD_RS,Pin.OUT).high()
  # High bits
    Pin(LCD_D4,Pin.OUT).low()
    Pin(LCD_D5,Pin.OUT).low()
    Pin(LCD_D6,Pin.OUT).low()
    Pin(LCD_D7,Pin.OUT).low()
    
    if (bits&0x10)==0x10:
        Pin(LCD_D4,Pin.OUT).high()
    if bits&0x20==0x20:
        Pin(LCD_D5,Pin.OUT).high()
    if bits&0x40==0x40:
        Pin(LCD_D6,Pin.OUT).high()
    if bits&0x80==0x80:
        Pin(LCD_D7,Pin.OUT).high()
    # Toggle 'Enable' pin   
    lcd_toggle_enable()
    # Low bits  
    Pin(LCD_D4,Pin.OUT).low()
    Pin(LCD_D5,Pin.OUT).low()
    Pin(LCD_D6,Pin.OUT).low()
    Pin(LCD_D7,Pin.OUT).low()

    if bits&0x01==0x01:
        Pin(LCD_D4,Pin.OUT).high()
    if bits&0x02==0x02:    
        Pin(LCD_D5,Pin.OUT).high()
    if bits&0x04==0x04:
        Pin(LCD_D6,Pin.OUT).high()
    if bits&0x08==0x08:
        Pin(LCD_D7,Pin.OUT).high()
        
      # Toggle 'Enable' pin
      
    lcd_toggle_enable()
    
def lcd_toggle_enable():
    time.sleep(0.0005)
    Pin(LCD_E,Pin.OUT).high()
    time.sleep(0.0005)
    Pin(LCD_E,Pin.OUT).low()
    time.sleep(0.0005)
            
if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        pass
#     finally:
#         lcd_byte(0x01, LCD_CMD)
        #str("Goodbye!",LCD_LINE_1)
#         GPIO.cleanup()
#