from machine import ADC, Pin
import usb_hid
import time

# Volume keys HID report
VOLUME_UP = 0x80
VOLUME_DOWN = 0x81
MUTE = 0x7F

pot = ADC(26)
switch = Pin(14, Pin.IN, Pin.PULL_DOWN)

last_volume = -1
last_mute = -1

def send_hid(code):
    report = bytearray(4)
    report[0] = code
    usb_hid.report(3, report)
    time.sleep(0.05)
    usb_hid.report(3, b'\x00\x00\x00\x00')

while True:
    # Lê volume
    raw = pot.read_u16()
    volume = int((raw / 65535) * 100)  # 0–100%

    if last_volume == -1:
        last_volume = volume

    # Ajuste de volume
    if volume > last_volume + 2:
        send_hid(VOLUME_UP)
        last_volume = volume
    elif volume < last_volume - 2:
        send_hid(VOLUME_DOWN)
        last_volume = volume

    # Chave Mute
    mute_state = switch.value()
    if mute_state != last_mute:
        send_hid(MUTE)
        last_mute = mute_state

    time.sleep(0.05)