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Add offset option to freedom-bin2hex script for supporting SPI flash #11

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Add offset option to freedom-bin2hex script for supporting SPI flash #11

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16 changes: 12 additions & 4 deletions freedom-bin2hex.py
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Original file line number Diff line number Diff line change
Expand Up @@ -20,8 +20,12 @@ def grouper(iterable, n, fillvalue=None):
return zip_longest(*args, fillvalue=fillvalue)


def convert(bit_width, infile, outfile):
def convert(bit_width, offset, infile, outfile):
byte_width = bit_width // 8

for i in range(offset // byte_width):
outfile.write('00'.zfill(2 * byte_width) + '\n')

if sys.version_info >= (3, 0):
for row in grouper(infile.read(), byte_width, fillvalue=0):
# Reverse because in Verilog most-significant bit of vectors is first.
Expand All @@ -33,7 +37,6 @@ def convert(bit_width, infile, outfile):
hex_row = ''.join('{:02x}'.format(ord(b)) for b in reversed(row))
outfile.write(hex_row + '\n')


def main():
parser = argparse.ArgumentParser(
description='Convert a binary file to a format that can be read in '
Expand All @@ -54,6 +57,11 @@ def main():
nargs='?',
type=argparse.FileType('w'),
default=sys.stdout)
parser.add_argument('--offset',
type=lambda x: int(x,0),
default=0x0,
help='How many zeros to prepend.')

parser.add_argument('--bit-width', '-w',
type=int,
required=True,
Expand All @@ -62,8 +70,8 @@ def main():

if args.bit_width % 8 != 0:
sys.exit("Cannot handle non-multiple-of-8 bit width yet.")
convert(args.bit_width, args.infile, args.outfile)
convert(args.bit_width, args.offset, args.infile, args.outfile)


if __name__ == '__main__':
main()
main()