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Thread: Working on my PS2 to Parallel keyboard, I need a little ARM help.

  1. #1

    Default Working on my PS2 to Parallel keyboard, I need a little ARM help.

    I've got the STMF103 code working well but now I'm trying to document. I wrote some hand generated assembly code but lost my notes ( scribbled on a piece of paper that likely made it to the recycle bin ). I have two instructions that I'm not sure what they are. I was hoping someone might be able to disassemble them for me.
    It was easier to look at the spec and create the binary than to go backwards from the binary to the operation

    In byte order: FF, D0, F7, FF
    in machine order: FFF7D0FF
    In byte order: FF, C9, F7, FF
    In machine order: FFF7C9FF


  2. #2
    Join Date
    Jan 2007
    Pacific Northwest, USA
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    Are these Thumb instructions?

  3. #3


    Quote Originally Posted by Chuck(G) View Post
    Are these Thumb instructions?
    Yes, Thumb instruction set but I think these are part of the original ARM. Most Thumb, only, are only 16 bits.
    At first I thought these were like BX but they are something different. There don't seem to be a lot of disassemblers ( free ) on the web for these processors. If I look through the possible ones, maybe I'll figure it out. I'm pissed that I didn't make some notes on the computer! I suspect, at the time, I'd thought the usage was so obvious that I'd just know what it was.

  4. #4


    They were BL instructions. It just pointed to locations I'd forgot to put labels on.


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