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@@ -0,0 +1,59 @@ |
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#!/usr/bin/python |
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# Read specified number of bytes in specified blkdev ID and spit it to stdout. |
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# The proper blkdev has to be selected and placed already. |
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import argparse |
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import os |
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import sys |
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import time |
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# Some place where it's safe to write 0xff bytes. |
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MEMPTR = '9000' |
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def sendcmd(fd, cmd): |
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# The serial link echoes back all typed characters and expects us to read |
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# them. We have to send each char one at a time. |
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print("Executing {}".format(cmd.decode()), file=sys.stderr) |
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for c in cmd: |
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os.write(fd, bytes([c])) |
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os.read(fd, 1) |
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os.write(fd, b'\n') |
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os.read(fd, 2) # sends back \r\n |
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def main(): |
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parser = argparse.ArgumentParser() |
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parser.add_argument('device') |
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parser.add_argument('bytecount') |
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args = parser.parse_args() |
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try: |
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bytecount = int(args.bytecount, 16) |
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except ValueError: |
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print("bytecount has to be hexadecimal without prefix.") |
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return 1 |
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fd = os.open(args.device, os.O_RDWR) |
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sendcmd(fd, 'mptr {}'.format(MEMPTR).encode()) |
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os.read(fd, 9) |
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while bytecount > 0: |
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toread = min(bytecount, 0x100) |
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sendcmd(fd, 'load {:x}'.format(toread & 0xff).encode()) |
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os.read(fd, 5) |
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sendcmd(fd, 'peek {:x}'.format(toread & 0xff).encode()) |
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peek = b'' |
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while len(peek) < toread * 2: |
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peek += os.read(fd, 1) |
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time.sleep(0.0001) |
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os.read(fd, 5) |
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while peek: |
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c = peek[:2] |
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sys.stdout.buffer.write(bytes([int(c, 16)])) |
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peek = peek[2:] |
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bytecount -= toread |
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os.close(fd) |
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return 0 |
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if __name__ == '__main__': |
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sys.exit(main()) |
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