Re: [uCsimm] SPI

From: Kang Tin LAI (
Date: Fri May 12 2000 - 11:36:09 EDT


Sorry, when I started my fresh RT kernel, it told me "jeffies lost",
"jeffies lost", "jeffies lost", "jeffies lost", "jeffies lost",...

I still work on putting RT to simm, so I haven't any idea of this. May
Kwosk? (Sorry that I am not sure his name) (Kwosk ports RT to simm) who
has a new idea for improving the RT interrupt latency.

If you require to maintain constant between 2 16-bit xfer, extra
hardware is un-avoidable.

"Reynolds, Alfred" wrote:
> How much skew is there in RTLinux periodic timers? Can they be within 62.5us
> of the expected time? I know interrupts on RTLinux on the uCSimm take about
> 130us to be serviced, so using the interrupt method for filling the buffer
> won't work.
> To do the CBR stream, I am going to try the easy way with the SPI and trying
> to service it quick enough. If it doesn't work then I will build some
> supporting circuitry :)
> Alfred
> This message resent by the list server
This message resent by the list server

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