lcdprint.py

import sys
from pydos_hw import Pydos_hw
try:
    from pydos_ui import input
except ImportError:
    pass

if sys.implementation.name.upper() == "CIRCUITPYTHON":
    from circuitpython_i2c_lcd import I2cLcd
else:
    import lcd2004

def lcdPrint(passedIn):

    # The PCF8574 has a jumper selectable address: 0x20 - 0x27
    DEFAULT_I2C_ADDR = 0x27
    foundLCD = False

    mess = passedIn
    if mess == "":
        mess = input("Say what?: ")

    i2c = None
    for i2cNo in range(3):
        try:
            i2c = Pydos_hw.I2C(i2cNo)
        except:
            pass
        if i2c:
            if sys.implementation.name.upper() == "CIRCUITPYTHON":
                # circuitpython seems to require locking the i2c bus
                while not i2c.try_lock():
                    pass

            if DEFAULT_I2C_ADDR in i2c.scan():
                foundLCD = True
                break

            if sys.implementation.name.upper() == 'CIRCUITPYTHON':
                i2c.unlock()

    if not foundLCD:
        print("LCD not found at address: ",hex(DEFAULT_I2C_ADDR))
        return

    if sys.implementation.name.upper() == "CIRCUITPYTHON":

        # 2 lines, 16 characters per line
        lcd = I2cLcd(i2c, DEFAULT_I2C_ADDR, 2, 16)

        # smiley faces as custom characters
        happy = bytearray([0x00,0x0A,0x00,0x04,0x00,0x11,0x0E,0x00])
        heart = bytearray([0x00,0x00,0x0A,0X15,0X11,0X0A,0X04,0X00])
        grin = bytearray([0x00,0x00,0x0A,0x00,0x1F,0x11,0x0E,0x00])
        lcd.custom_char(0, happy)
        lcd.custom_char(1, heart)
        lcd.custom_char(2, grin)

    else:
        lcd=lcd2004.lcd(DEFAULT_I2C_ADDR,i2c)
        lcd.lcd_backlight(True)
        lcd.lcd_clear()

    if mess == "":
        if sys.implementation.name.upper() == "CIRCUITPYTHON":
            lcd.backlight_off()
        else:
            lcd.lcd_backlight(False)
    else:

        if sys.implementation.name.upper() == "CIRCUITPYTHON":
            mess = mess.replace("<3",chr(1))
            mess = mess.replace(":)",chr(0))
            mess = mess.replace("(:",chr(0))
            mess = mess.replace(":-)",chr(0))
            mess = mess.replace("(-:",chr(0))
            mess = mess.replace(":D",chr(2))

            lcd.move_to(0,0)
            lcd.putstr(mess)
        else:
            lcd.lcd_print(mess,1,0)

    if sys.implementation.name.upper() == "CIRCUITPYTHON":
        i2c.unlock()
        #i2c.deinit()


if __name__ != "PyDOS":
    passedIn = ""

lcdPrint(passedIn)