circuitpython/tools/dfu.py

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#!/usr/bin/python
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# SPDX-FileCopyrightText: 2014 MicroPython & CircuitPython contributors (https://github.com/adafruit/circuitpython/graphs/contributors)
#
# SPDX-License-Identifier: MIT
# Written by Antonio Galea - 2010/11/18
# Updated for DFU 1.1 by Sean Cross - 2020/03/31
# Distributed under Gnu LGPL 3.0
# see http://www.gnu.org/licenses/lgpl-3.0.txt
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import sys, struct, zlib, os
from optparse import OptionParser
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DEFAULT_DEVICE = "0x0483:0xdf11"
def named(tuple, names):
return dict(zip(names.split(), tuple))
def consume(fmt, data, names):
n = struct.calcsize(fmt)
return named(struct.unpack(fmt, data[:n]), names), data[n:]
def cstring(string):
return string.split(b"\0", 1)[0]
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def compute_crc(data):
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return 0xFFFFFFFF & -zlib.crc32(data) - 1
def parse(file, dump_images=False):
print('File: "%s"' % file)
data = open(file, "rb").read()
crc = compute_crc(data[:-4])
data = data[len(data) - 16 :]
suffix = named(struct.unpack("<4H3sBI", data[:16]), "device product vendor dfu ufd len crc")
print(
"usb: %(vendor)04x:%(product)04x, device: 0x%(device)04x, dfu: 0x%(dfu)04x, %(ufd)s, %(len)d, 0x%(crc)08x"
% suffix
)
if crc != suffix["crc"]:
print("CRC ERROR: computed crc32 is 0x%08x" % crc)
data = data[16:]
if data:
print("PARSE ERROR")
def build(file, data, device=DEFAULT_DEVICE):
# Parse the VID and PID from the `device` argument
v, d = map(lambda x: int(x, 0) & 0xFFFF, device.split(":", 1))
# Generate the DFU suffix, consisting of these fields:
# Field name | Length | Description
# ================+=========+================================
# bcdDevice | 2 | The release number of this firmware (0xffff - don't care)
# idProduct | 2 | PID of this device
# idVendor | 2 | VID of this device
# bcdDFU | 2 | Version of this DFU spec (0x01 0x00)
# ucDfuSignature | 3 | The characters 'DFU', printed in reverse order
# bLength | 1 | The length of this suffix (16 bytes)
# dwCRC | 4 | A CRC32 of the data, including this suffix
data += struct.pack("<4H3sB", 0xFFFF, d, v, 0x0100, b"UFD", 16)
crc = compute_crc(data)
# Append the CRC32 of the entire block
data += struct.pack("<I", crc)
open(file, "wb").write(data)
if __name__ == "__main__":
usage = """
%prog [-d|--dump] infile.dfu
%prog {-b|--build} file.bin [{-D|--device}=vendor:device] outfile.dfu"""
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parser = OptionParser(usage=usage)
parser.add_option(
"-b",
"--build",
action="store",
dest="binfile",
help="build a DFU file from given BINFILE",
metavar="BINFILE",
)
parser.add_option(
"-D",
"--device",
action="store",
dest="device",
help="build for DEVICE, defaults to %s" % DEFAULT_DEVICE,
metavar="DEVICE",
)
parser.add_option(
"-d",
"--dump",
action="store_true",
dest="dump_images",
default=False,
help="dump contained images to current directory",
)
(options, args) = parser.parse_args()
if options.binfile and len(args) == 1:
binfile = options.binfile
if not os.path.isfile(binfile):
print("Unreadable file '%s'." % binfile)
sys.exit(1)
target = open(binfile, "rb").read()
outfile = args[0]
device = DEFAULT_DEVICE
# If a device is specified, parse the pair into a VID:PID pair
# in order to validate them.
if options.device:
device = options.device
try:
v, d = map(lambda x: int(x, 0) & 0xFFFF, device.split(":", 1))
except:
print("Invalid device '%s'." % device)
sys.exit(1)
build(outfile, target, device)
elif len(args) == 1:
infile = args[0]
if not os.path.isfile(infile):
print("Unreadable file '%s'." % infile)
sys.exit(1)
parse(infile, dump_images=options.dump_images)
else:
parser.print_help()
sys.exit(1)