from machine import Pin, SPI
import max7219
from time import sleep

print(max7219)

# SPI setup
spi = SPI(1, baudrate=10000000, polarity=0, phase=0,
          sck=Pin(18), mosi=Pin(23), miso=Pin(19))  # miso not used but required for SPI
cs = Pin(5, Pin.OUT)
display = max7219.Matrix8x8(spi, cs, 1)
display.brightness(5)

# ==== Button Setup ====
button = Pin(14, Pin.IN, Pin.PULL_UP)  # Button between IO14 and GND

# ===== Rotary Encoder Setup =====
clk = Pin(32, Pin.IN, Pin.PULL_UP)
dt = Pin(33, Pin.IN, Pin.PULL_UP)

# Letters to cycle through
letters = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H']
index = 0

def show_letter(letter):
    display.fill(0)
    display.text(letter, 0, 0, 1)
    display.show()

# Show initial letter
show_letter(letters[index])

# ===== Main Loop =====
last_clk = clk.value()

while True:
    current_clk = clk.value()
    if current_clk != last_clk:
        if dt.value() != current_clk:
            index = (index + 1) % len(letters)  # Clockwise
        else:
            index = (index - 1) % len(letters)  # Counterclockwise
        show_letter(letters[index])
    last_clk = current_clk