import time
from machine import Pin

class LCD1602:
    def __init__(self, rs, en, d4, d5, d6, d7):
        self.rs = Pin(rs, Pin.OUT)
        self.en = Pin(en, Pin.OUT)
        self.data_pins = [
            Pin(d4, Pin.OUT),
            Pin(d5, Pin.OUT),
            Pin(d6, Pin.OUT),
            Pin(d7, Pin.OUT)
        ]
        self._init_lcd()

    def _pulse(self):
        self.en.value(1)
        time.sleep_us(1)
        self.en.value(0)
        time.sleep_us(100)

    def _send(self, value, mode=0):
        self.rs.value(mode)
        for i in range(2):
            for j in range(4):
                self.data_pins[j].value((value >> (4 * (1 - i) + j)) & 0x01)
            self._pulse()
        time.sleep_ms(2)

    def _init_lcd(self):
        time.sleep_ms(20)
        self._send(0x33)  # init
        self._send(0x32)  # 4-bit mode
        self._send(0x28)  # 2 lines, 5x7 matrix
        self._send(0x0C)  # display on, cursor off
        self._send(0x06)  # entry mode
        self.clear()

    def clear(self):
        self._send(0x01)
        time.sleep_ms(2)

    def putstr(self, string):
        for char in string:
            self._send(ord(char), 1)

    def move_to(self, col, row):
        addr = col + (0x40 if row else 0x00)
        self._send(0x80 | addr)