mirror of
https://github.com/tillitis/tillitis-key1.git
synced 2024-06-13 16:42:20 +00:00
12f6575afd
* Update raw_usb interface to the 0200 version * Rename ice* commands to be less confusing * Split production test into a runner script and test library * Add continuous randomized test for test library * Speed improvements for nvcm commands
85 lines
2.2 KiB
Python
Executable File
85 lines
2.2 KiB
Python
Executable File
#!/usr/bin/env python
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""" bistream to NVCM command conversion is based on majbthrd's work
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in https://github.com/YosysHQ/icestorm/pull/272
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"""
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def pybin2nvcm(bitstream: bytes) -> list[str]:
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"""Convert an ice40 bitstream into an NVCM program
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The NVCM format is a set of commands that are run against the
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NVCM state machine, which instruct the state machine to write
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the bitstream into the NVCM. It's somewhat convoluted!
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Keyword arguments:
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bitstream -- Bitstream to convert into NVCM format
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"""
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# ensure that the file starts with the correct bistream preamble
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for origin in range(0, len(bitstream)):
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if bitstream[origin:origin + 4] == bytes.fromhex('7EAA997E'):
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break
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if origin == len(bitstream):
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raise ValueError('Preamble not found')
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print(f'Found preamable at {origin:08x}')
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# there might be stuff in the header with vendor tools,
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# but not usually in icepack produced output, so ignore it for now
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rows = []
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rows.append('06')
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for pos in range(origin, len(bitstream), 8):
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row = bitstream[pos:pos + 8]
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# pad out to 8-bytes
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row += b'\0' * (8 - len(row))
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if row == bytes(8):
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# skip any all-zero entries in the bistream
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continue
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# NVCM addressing is very weird
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addr = pos - origin
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nvcm_addr = int(addr / 328) * 4096 + (addr % 328)
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row_str = f'02{nvcm_addr:06x}{row.hex()}'
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row_str = ' '.join([row_str[i:i + 2]
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for i in range(0, len(row_str), 2)]) + ' '
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rows.append(row_str)
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rows.append('04')
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return rows
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if __name__ == "__main__":
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import argparse
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parser = argparse.ArgumentParser()
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parser.add_argument('infile',
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type=str,
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help='input bin file')
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parser.add_argument('outfile',
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type=str,
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help='output nvcm file')
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args = parser.parse_args()
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with open(args.infile, 'rb') as f_in:
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data = f_in.read()
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cmds = pybin2nvcm(data)
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with open(args.outfile, 'w', encoding='utf-8') as f_out:
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for cmd in cmds:
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f_out.write(cmd)
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f_out.write('\n')
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