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Add a helper script to add a DFU header
This is so simple we can do it in 10 lines of Python. It matches the format of the `add_capsule_header.py` utility.
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contrib/firmware_packager/add_dfu_header.py
Executable file
49
contrib/firmware_packager/add_dfu_header.py
Executable file
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#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2020 Richard Hughes <richard@hughsie.com>
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#
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# SPDX-License-Identifier: LGPL-2.1+
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import struct
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import zlib
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import argparse
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def main(bin_fn, dfu_fn, pad, vid, pid, rev):
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# read binary file
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with open(bin_fn, 'rb') as f:
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blob = f.read()
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# pad blob to a specific size
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if pad:
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while len(blob) < int(pad, 16):
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blob += b'\0'
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# create DFU footer with checksum
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blob += struct.pack('<HHHH3sB',
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int(rev, 16), # version
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int(pid, 16), # PID
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int(vid, 16), # VID
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0x0100, # DFU version
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b'UFD', # signature
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0x10) # hdrlen
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crc32 = zlib.crc32(blob) ^ 0xffffffff
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blob += struct.pack('<L', crc32)
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# write binary file
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with open(dfu_fn, 'wb') as f:
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f.write(blob)
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if __name__ == "__main__":
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# parse args
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parser = argparse.ArgumentParser(description='Add DFU footer on firmware')
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parser.add_argument('--bin', help='Path to the .bin file', required=True)
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parser.add_argument('--dfu', help='Output DFU file path', required=True)
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parser.add_argument('--pad', help='Pad to a specific size, e.g. 0x4000', default=None)
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parser.add_argument('--vid', help='Vendor ID, e.g. 0x273f', required=True)
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parser.add_argument('--pid', help='Product ID, e.g. 0x1002', required=True)
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parser.add_argument('--rev', help='Revision, e.g. 0x1000', required=True)
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args = parser.parse_args()
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main(args.bin, args.dfu, args.pad, args.vid, args.pid, args.rev)
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