Re: SV 125 PS2 to Sun converter issue (keyboard not detected)

I got around to testing the converter with a PS2 KVM, works same as
with normal keyboard and mouse.

Thanks,

Mike.

On Sun, Mar 13, 2011 at 8:08 PM, Mike Malopolski <[email protected]> wrote:
> Miod,
>
> I spent a few hours today debugging different loops and timings, some
> interesting results:
>
> When I got the SV 125 device working yesterday, I did not change the
> ltries variable in the loops, but instead I increased the value sent
> into the DELAY() function from 1000 to 3000.  However, if no keyboard
> was present, it would still wait 15 seconds (which was your point this
> morning), which is way too long for serial users.
>
> Today I changed the value sent to DELAY() back to 1000 in the loops,
> and increased the ltries variable from 1000 to 3000 (and added printout
> of its value after each while loop).  The first two loops (the one that
> waits for the SKEY_STATE_RESET state and the one that waits for the
> SKEY_STATE_GETKEY state) always complete within the 1000 tries.  If a
> delay is not in place before the SKEY_CMD_LAYOUT is sent, the SV 125
> must not respond properly, because the third loop does not get anything
> other then -1 in 1000 tries.  The biggest indicator of this was that if
> I had the printf() for the ltries inside the condition that executes
> the break, it delayed the execution long enough for the keyboard to
> always work.  If I stored the ltries value in a temporary variable and
> printed out all three of them after the loops, then the keyboard would
> not be recognized.
>
> After all of that, I added a 3000 microsecond delay right before the
> SKBD_CMD_LAYOUT request because I assumed that the reason it worked
> yesterday was due to the longer delay (as opposed to the number of
> tries).  That worked, the SV 125 converter works correctly with that
> modification.
>
> The best part about that is if no keyboard is present, it will not
> increase the time it takes to boot (even if it did it would be .003 of
> a second * 5 for total of .015 of a second), but works with the SV 125.
>
> Again, I am not sure if this is something that anyone other then me
> would want, so if anyone is interested I included a unified diff output
> at the bottom of this message.
>
> Thanks for everyone's help.
>
> Regards,
>
> Mike.
>
> --- comkbd_ebus.c.orig  Sat Mar 12 23:49:38 2011
> +++ comkbd_ebus.c Sun Mar 13 19:22:21 2011
> @@ -483,6 +483,7 @@
>      if (ltries == 0)
>         continue;
>
> +      DELAY(3000);
>
>      /* Send layout request */
>      comkbd_putc(sc, SKBD_CMD_LAYOUT);