I am not familiar with mikropascal, however, assuming it compiles down
to something reasonable, I would not just assume that your solution is to
re-program your routine in assembler.  It is very likely that your problem is
related to either your design approach, or some hidden software bug that
is eating up your cycles.

I do all of my embedded programming in C ( various compilers ) and I have
re-programmed critical sections in assembly, but not before I have looked
at the generated output of the compiler and convinced myself that I could
improve the generated code significantly enough to warrant the effort.

regards,

Bob Bullock

At 07:50 AM 11/12/2004, you wrote:
>From: "Jan-Erik Soderholm"
>
> > What speed are you running at now, and what speed will you
> > be running in later ? (The speed of the PIC, that is).
>My development board has a 4Mhz clock. I'm still deciding which speed I'm
>going to use later, I have to take in consideration 3 things: 1)
>compatibility with my desired USART speed, 2) power consumption (it's
>battery operated) and now 3) will I have enough speed to do everything I
>want to do?
>
> > And, I don't understand, do you write to the CF card
> > one byte at the time ? Your interrupt routine runs once
> > for each received byte on the serial link, not ?
>
>Actually I still don't know. I want to write to the CF (yes, compactflash)
>soon, but for now I'm giving one step at time and instead I'm writing to the
>USART (going to the PC).
>
> > A final thought...
> > Does the specificatins of the CF card indicate that it should be able
> > to keep up writing at the same speed that the data comes in ?
> > If so, there must be something else in your code that takes to long.
> > If not, well, it doesn't matter *what* you do, does it ?
>
>That's a very good guess. I'm using mikropascal, I think for this
>performance-sensitive application I'll have to use god old assembler.
>
>
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