import time
import board
import digitalio
import notecard
from notecard import card, dfu, hub

# The unique Product Identifier for your device. Claim one in a Notehub project.
productUID = "com.your-company.your-project"

# The firmware version reported to Notehub via dfu.status. Bump this (and change
# BLINK_DELAY) when you build a new image to update to.
FIRMWARE_VERSION = "1.0.0"

# Seconds the LED stays on/off. Change this to make the update visually obvious.
BLINK_DELAY = 0.5


def configure_outboard_dfu(nCard):
    """Put the Notecard online and enable Outboard Firmware Update for the host.

    Outboard Firmware Update requires the Notecard to be in "continuous" or
    "periodic" mode. On a Notecarrier F the DFU signals are routed over the
    Notecard's shared AUX pins, so card.dfu uses mode "aux" and card.aux is set
    to "off" to free those pins for DFU.
    """
    hub.set(nCard, product=productUID, mode="continuous", sn="circuitpython-notecard")

    # Enable Outboard Firmware Update and tell the Notecard the host MCU type.
    card.dfu(nCard, name="stm32", on=True, mode="aux")

    # Free the AUX pins so they can be used for Outboard Firmware Update.
    card.aux(nCard, mode="off")

    # Enable host DFU and report the running firmware version to Notehub.
    dfu.status(nCard, on=True, version=FIRMWARE_VERSION)


def main():
    """Enable Outboard DFU, then blink the built-in LED as the update payload."""
    i2c = board.I2C()
    nCard = notecard.OpenI2C(i2c, 0, 0, debug=True)

    configure_outboard_dfu(nCard)

    led = digitalio.DigitalInOut(board.LED)
    led.direction = digitalio.Direction.OUTPUT

    print("Running firmware version {}. Hit CTRL-C to stop.".format(FIRMWARE_VERSION))
    while True:
        led.value = True
        time.sleep(BLINK_DELAY)
        led.value = False
        time.sleep(BLINK_DELAY)


main()