96 lines
3.5 KiB
Python
96 lines
3.5 KiB
Python
#!/usr/bin/python
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# Written by Antonio Galea - 2010/11/18
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# Updated for DFU 1.1 by Sean Cross - 2020/03/31
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# Distributed under Gnu LGPL 3.0
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# see http://www.gnu.org/licenses/lgpl-3.0.txt
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import sys,struct,zlib,os
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from optparse import OptionParser
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DEFAULT_DEVICE="0x1209:0x5bf0"
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def named(tuple,names):
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return dict(zip(names.split(),tuple))
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def consume(fmt,data,names):
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n = struct.calcsize(fmt)
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return named(struct.unpack(fmt,data[:n]),names),data[n:]
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def cstring(string):
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return string.split('\0',1)[0]
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def compute_crc(data):
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return 0xFFFFFFFF & -zlib.crc32(data) -1
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def parse(file,dump_images=False):
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print ('File: "%s"' % file)
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data = open(file,'rb').read()
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crc = compute_crc(data[:-4])
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data = data[len(data)-16:]
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suffix = named(struct.unpack('<4H3sBI',data[:16]),'device product vendor dfu ufd len crc')
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print ('usb: %(vendor)04x:%(product)04x, device: 0x%(device)04x, dfu: 0x%(dfu)04x, %(ufd)s, %(len)d, 0x%(crc)08x' % suffix)
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if crc != suffix['crc']:
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print ("CRC ERROR: computed crc32 is 0x%08x" % crc)
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data = data[16:]
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if data:
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print ("PARSE ERROR")
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def build(file,data,device=DEFAULT_DEVICE):
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# Parse the VID and PID from the `device` argument
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v,d=map(lambda x: int(x,0) & 0xFFFF, device.split(':',1))
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# Generate the DFU suffix, consisting of these fields:
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# Field name | Length | Description
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# ================+=========+================================
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# bcdDevice | 2 | The release number of this firmware (0xffff - don't care)
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# idProduct | 2 | PID of this device
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# idVendor | 2 | VID of this device
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# bcdDFU | 2 | Version of this DFU spec (0x01 0x00)
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# ucDfuSignature | 3 | The characters 'DFU', printed in reverse order
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# bLength | 1 | The length of this suffix (16 bytes)
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# dwCRC | 4 | A CRC32 of the data, including this suffix
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data += struct.pack('<4H3sB',0xffff,d,v,0x0100,b'UFD',16)
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crc = compute_crc(data)
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# Append the CRC32 of the entire block
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data += struct.pack('<I',crc)
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open(file,'wb').write(data)
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if __name__=="__main__":
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usage = """
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%prog [-d|--dump] infile.dfu
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%prog {-b|--build} file.bin [{-D|--device}=vendor:device] outfile.dfu"""
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parser = OptionParser(usage=usage)
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parser.add_option("-b", "--build", action="store", dest="binfile",
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help="build a DFU file from given BINFILE", metavar="BINFILE")
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parser.add_option("-D", "--device", action="store", dest="device",
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help="build for DEVICE, defaults to %s" % DEFAULT_DEVICE, metavar="DEVICE")
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parser.add_option("-d", "--dump", action="store_true", dest="dump_images",
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default=False, help="dump contained images to current directory")
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(options, args) = parser.parse_args()
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if options.binfile and len(args)==1:
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binfile = options.binfile
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if not os.path.isfile(binfile):
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print ("Unreadable file '%s'." % binfile)
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sys.exit(1)
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target = open(binfile,'rb').read()
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outfile = args[0]
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device = DEFAULT_DEVICE
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# If a device is specified, parse the pair into a VID:PID pair
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# in order to validate them.
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if options.device:
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device=options.device
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try:
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v,d=map(lambda x: int(x,0) & 0xFFFF, device.split(':',1))
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except:
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print ("Invalid device '%s'." % device)
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sys.exit(1)
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build(outfile,target,device)
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elif len(args)==1:
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infile = args[0]
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if not os.path.isfile(infile):
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print ("Unreadable file '%s'." % infile)
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sys.exit(1)
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parse(infile, dump_images=options.dump_images)
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else:
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parser.print_help()
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sys.exit(1)
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