from machine import Pin, SPI
import time

# Konfigurasi pin ESP32
spi = SPI(1, baudrate=100000, polarity=0, phase=0)
data_pin = Pin(33, Pin.OUT)  # DS
latch_pin = Pin(26, Pin.OUT)  # STCP
clock_pin = Pin(32, Pin.OUT)  # SHCP

# Fungsi untuk mengirim data ke IC 74HC595
def shift_out(byte):
    for _ in range(8):
        data_pin.value(byte & 0x80)
        clock_pin.on()
        clock_pin.off()
        byte <<= 1

# Fungsi untuk meng-update LED
def update_leds(led_states):
    latch_pin.off()
    for i in range(3, -1, -1):
        shift_out(led_states[i])
    latch_pin.on()

# Inisialisasi LED states (semua mati)
led_states = [0, 0, 0, 0]

# Fungsi untuk menyalakan LED pada posisi tertentu
def turn_on_led(position):
    led_states[position // 8] |= (1 << (position % 8))

# Fungsi untuk mematikan LED pada posisi tertentu
def turn_off_led(position):
    led_states[position // 8] &= ~(1 << (position % 8))

# Program utama
def main():
    while True:
        # Menyalakan LED satu per satu
        for i in range(32):
            turn_on_led(i)
            update_leds(led_states)
            time.sleep(0.5)
            turn_off_led(i)

if __name__ == "__main__":
    main()