convert_calibration.py

#!/usr/bin/env python3
"""
Convert legacy RocketLogger calibration data files to new format.

Copyright (c) 2019-2020, ETH Zurich, Computer Engineering Group
All rights reserved.

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  this list of conditions and the following disclaimer in the documentation
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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"""

import os
import sys
import numpy as np
from rocketlogger.calibration import (
    _CALIBRATION_FILE_DTYPE,
    _CALIBRATION_FILE_MAGIC,
    _CALIBRATION_FILE_VERSION,
    _CALIBRATION_FILE_HEADER_LENGTH,
    _CALIBRATION_PRU_CYCLES_OFFSET,
    _CALIBRATION_PRU_CYCLES_SCALE,
)


# data format of the calibration file
_LEGACY_FILE_DTYPE = np.dtype(
    [
        ("timestamp", "<datetime64[s]"),
        ("offset", ("<i4", 8)),
        ("scale", ("<f8", 8)),
    ]
)

# old to new channel enumeration mapping
_CHANNEL_REMAPPING = [2, 3, 6, 7, 1, 0, 5, 4]

if __name__ == "__main__":

    # handle the only argument
    if len(sys.argv) != 2:
        raise TypeError("script takes exactly one argument, the calibration to convert")
    filename = str(sys.argv[1])

    # load and rename legacy calibration file
    data_legacy = np.fromfile(filename, dtype=_LEGACY_FILE_DTYPE)

    # assemble new calibration file structure
    offset_new = np.concatenate(
        (
            data_legacy["offset"].squeeze()[_CHANNEL_REMAPPING],
            [_CALIBRATION_PRU_CYCLES_OFFSET],
        )
    )
    scale_new = np.concatenate(
        (
            data_legacy["scale"].squeeze()[_CHANNEL_REMAPPING],
            [_CALIBRATION_PRU_CYCLES_SCALE],
        )
    )
    filedata = np.array(
        [
            (
                _CALIBRATION_FILE_MAGIC,
                _CALIBRATION_FILE_VERSION,
                _CALIBRATION_FILE_HEADER_LENGTH,
                data_legacy["timestamp"].squeeze(),
                offset_new,
                scale_new,
            )
        ],
        dtype=_CALIBRATION_FILE_DTYPE,
    )

    # rename the old calibration file and write new calibration format
    os.rename(filename, filename + "_v1")
    filedata.tofile(filename)