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View topic - N0RAMboot games on a stick.

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  • Joined: 01 Sep 2018
  • Posts: 10
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N0RAMboot games on a stick.
Post Posted: Sat Jul 13, 2019 10:26 pm
Hello,
I am trying to make boot sticks for N0RAMBoot using a Arduino.
I have the hardware CAD:d out but now the software needs some debugging.
I have implemented xmodem (checksum version) but I can't get xmodem-crc to work.
Please have a look: https://github.com/MrSVCD/N0RAMBoot-stick
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  • Joined: 24 Sep 2013
  • Posts: 123
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Post Posted: Sun Jul 14, 2019 10:37 am
Try completing a transfer against Teraterm. The most common errors I found implementing XMODEM myself are a wrong CRC polynome (Using PyCRC you can generate C source code for use with Arduino using the --model=xmodem option).
The second most common error is the endianness of CRC, I recall it is Big Endian as xmodex-boot.S reads CRC 'H' byte first.

Also, the first packet request starts with a 'C' character, while all the subsequent ones use a 'ACK/NACK' character.
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