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60 lines
1.6 KiB
Python
Executable File
60 lines
1.6 KiB
Python
Executable File
#!/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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