#!/usr/bin/env python3

import argparse
import logging
import struct

import serial

_LOGGER = logging.getLogger(__name__)


def _main():
    logging.basicConfig(
        level=logging.DEBUG,
        format="%(asctime)s:%(levelname)s:%(name)s:%(funcName)s:%(message)s",
        datefmt="%Y-%m-%dT%H:%M:%S%z",
    )
    argparser = argparse.ArgumentParser()
    argparser.add_argument("--serial-port", type=str, nargs="?", default="/dev/ttyUSB0")
    args = argparser.parse_args()
    _LOGGER.debug("args=%r", args)
    with serial.Serial(args.serial_port, 115200, timeout=2) as serial_port:
        _LOGGER.debug("serial_port.name=%s", serial_port.name)
        # _LOGGER.info("project_repo_url=%s", serial_port.readline().decode().strip())
        # _LOGGER.info("project_version=%s", serial_port.readline().decode().strip())
        while True:
            reading, = struct.unpack(">H", serial_port.read(2))
            voltage = reading * 5 / 1024
            print(f"{voltage:.02f}V")


if __name__ == "__main__":
    _main()