ISR-IST data transfer...

Hi, we are working on serial communication and the problem is that the
processor usage is around 90% during data transfer. We need to lower this and
searching msdn we come up with the idea of ISR notifying IST less frequently
so that we can gain from this.

Anyone please tell how we can modify ISR-IST so that coming data would first
be buffered in ISR and then how to pass this data to ISR?
Thanks for any help...

Valter
Thu Jul 20 07:27:37 CDT 2006

=?Utf-8?B?YnVueW1u?= <bunymn@discussions.microsoft.com> wrote in
news:ABB6B9B0-44AE-4021-AEE4-1A4D369220BD@microsoft.com:

> Hi, we are working on serial communication and the problem is that
> the processor usage is around 90% during data transfer. We need to
> lower this and searching msdn we come up with the idea of ISR
> notifying IST less frequently so that we can gain from this.
>
> Anyone please tell how we can modify ISR-IST so that coming data
> would first be buffered in ISR and then how to pass this data to
> ISR? Thanks for any help...

Under WINCE\PUBLIC\COMMON\OAK\DRIVERS\SERIAL you will find ISR16550
that is an implementation of an installable ISR for a serial port.


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Valter Minute
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