# The MIT License (MIT)
#
# Copyright (c) 2019 ladyada for Adafruit Industries
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
"""
`adafruit_adt7410`
====================================================

CircuitPython driver for reading temperature from the Analog Devices ADT7410
precision temperature sensor

* Author(s): ladyada

Implementation Notes
--------------------

**Hardware:**

**Software and Dependencies:**

* Adafruit CircuitPython firmware for the supported boards:
  https://github.com/adafruit/circuitpython/releases

* Adafruit's Bus Device library: https://github.com/adafruit/Adafruit_CircuitPython_BusDevice

* Adafruit's Register library: https://github.com/adafruit/Adafruit_CircuitPython_Register
"""


import time
import struct
from adafruit_bus_device.i2c_device import I2CDevice
from adafruit_register.i2c_bit import RWBit, ROBit
from micropython import const

__version__ = "0.0.0-auto.0"
__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_ADT7410.git"


_ADT7410_TEMPMSB = const(0x0)
_ADT7410_TEMPLSB = const(0x1)
_ADT7410_STATUS = const(0x2)
_ADT7410_CONFIG = const(0x3)
_ADT7410_ID = const(0xB)
_ADT7410_SWRST = const(0x2F)


class ADT7410:
    """Interface to the Analog Devices ADT7410 temperature sensor."""

    # many modes can be set with register objects for simplicity
    ready = ROBit(_ADT7410_STATUS, 7)
    ctpin_polarity = RWBit(_ADT7410_CONFIG, 2)
    intpin_polarity = RWBit(_ADT7410_CONFIG, 3)
    comparator_mode = RWBit(_ADT7410_CONFIG, 4)
    high_resolution = RWBit(_ADT7410_CONFIG, 7)

    def __init__(self, i2c_bus, address=0x48):
        self.i2c_device = I2CDevice(i2c_bus, address)
        self._buf = bytearray(3)
        # Verify the manufacturer and device ids to ensure we are talking to
        # what we expect.
        _id = (self._read_register(_ADT7410_ID)[0]) & 0xF8
        if _id != 0xC8:
            raise ValueError(
                "Unable to find ADT7410 at i2c address " + str(hex(address))
            )
        self.reset()

    @property
    def temperature(self):
        """The temperature in celsius"""
        temp = self._read_register(_ADT7410_TEMPMSB, 2)
        return struct.unpack(">h", temp)[0] / 128

    @property
    def status(self):
        """The ADT7410 status registers current value"""
        return self._read_register(_ADT7410_STATUS)[0]

    @property
    def configuration(self):
        """The ADT7410 configuration register"""
        return self._read_register(_ADT7410_CONFIG)[0]

    @configuration.setter
    def configuration(self, val):
        return self._write_register(_ADT7410_CONFIG, val)

    def reset(self):
        """Perform a software reset"""
        self._write_register(_ADT7410_SWRST)
        time.sleep(0.5)

    def _read_register(self, addr, num=1):
        self._buf[0] = addr
        with self.i2c_device as i2c:
            i2c.write_then_readinto(
                self._buf, self._buf, out_end=1, in_start=1, in_end=num + 1
            )
        return self._buf[1 : num + 1]

    def _write_register(self, addr, data=None):
        self._buf[0] = addr
        end = 1
        if data:
            self._buf[1] = data
            end = 2
        with self.i2c_device as i2c:
            i2c.write(self._buf, end=end)