Thx. I already found example you mention (glad to know it's yours) and used
it as guideline how to use compare registers on IEP. Did reworked the
example and now it's running fine. I suspect that issue in my initial
example was with following piece of code
L1:
LBBO rT2, rIEPBase, IEP_COUNT, 4
QBLT L1, rT1, rT2
My expectation was that "quick branch" instructions does comparison of
complete registers (all 32 bits), but in fact it compares only 8 bits (you
can chose if it's B0,B1,B3 or B4). In my case I think it was working only
rT1.b0 and rT2.b0. For sure that contributed to unexpected execution flow,
maybe there was also something else.
Although reworked example works just fine, will debug this one as I don't
want to leave open ends :) Also will try debugger you mentioned, as writing
apps blindly and debug them only with LED attached to GPIO is bit of pain :)
Thx
Ivan
On Wednesday, October 2, 2013 12:16:58 AM UTC+2, Charles Steinkuehler wrote:
>
>
> I don't immediately see anything obvious that is wrong with your code.
>
> I have a known working example of using the IEP timers with the PRU, but
> I'm using the overflow event rather than polling the count value:
>
>
> https://github.com/cdsteinkuehler/linuxcnc/blob/MachineKit-ubc/configs/ARM/PRU-Debugger/pruexample.p
>
>
>
> --
> Charles Steinkuehler
> [email protected] <javascript:>
>
>
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