# Project objectives: 
#   Print a "Hello world!" text on the LCD screen to test its functionality
#   Learn how to use I2C communication between the LCD and Raspberry Pi Pico
#   Get familiarized with the pico_i2c_lcd and lcd_api modules
#
# Hardware and connections used:
#   LCD GND Pin to Raspberry Pi Pico GND
#   LCD VCC Pin to Raspberry Pi Pico VBUS 
#   (Note: VBUS is only to be used as power for the screen. 
#   It can't be used as power for the entire circuit if there are other components interfaced.)
#   LCD SDA Pin to Raspberry Pi Pico GPIO Pin 0
#   LCD SCL Pin to Raspberry Pi Pico GPIO Pin 1
#
# Programmer: Adrian Josele G. Quional
import machine
import utime

# Initialize I2C bus
i2c = machine.I2C(0, sda=machine.Pin(0), scl=machine.Pin(1), freq=400000)

# LCD display configuration
LCD_ADDR = 0x27
LCD_ROWS = 2
LCD_COLS = 16

# Initialize LCD display
lcd = machine.I2C(1, sda=machine.Pin(0), scl=machine.Pin(1))
lcd.writeto_mem(LCD_ADDR, 0x00, bytearray([0x38]))  # Function set
lcd.writeto_mem(LCD_ADDR, 0x00, bytearray([0x0C]))  # Display on, cursor off, blink off
lcd.writeto_mem(LCD_ADDR, 0x00, bytearray([0x01]))  # Clear display

# Print a message on the LCD
lcd.writeto_mem(LCD_ADDR, 0x00, bytearray([0x80, ord('H'), ord('e'), ord('l'), ord('l'), ord('o'), ord(','), ord(' '), ord('W'), ord('o'), ord('r'), ord('l'), ord('d'), ord('!')]))