[En-Nut-Discussion] Timer resolution....

[Czerteak]

Thaks a lot, I worked... :-)

I don't now why this isn't enabled by default, anyway... :-(

Czerteak


> See file makedefs.
> uncomment #DEFS = -DNUT_CPU_FREQ=14745600
> and rebuild libraries.  By default the 37kHz crystal is used I think.  This
> #define is also meant to remove the need of the 37kHz crystal on the board,
> and Calc cpu freq, just uses this #define value.
>
> This is supposed to cause the timer interrupt at 1/1000.  ie 1ms.
>
> I tried it last week tho, and I couldn't get it to work.  Must have done
> something wrong somewhere.
>
> -----Original Message-----
> From: Czerteak [mailto:czerteak at email.cz]
> Sent: Friday, 22 August 2003 12:06 AM
> To: en-nut-discussion at egnite.de
> Subject: [En-Nut-Discussion] Timer resolution....
>
>
> Hi,
>
> I was just wondering whether there's an easy way to get better system clock
> resolution. Digging through the sources (and experimenting, too) brought me
> to the magic number of 62 which seems to be the shortest interval you can
> wait (zero is considered exception). I need to get some data from the
> outside through the data/adress bus and send them in the interval of 30ms.
> Whe I use NutSleep(30) (or any other number between 1 and 62) it always
> returns after 62ms which is too long time period for me. On the other hand,
> send the data at maximal speed (about 1ms according to my measuring) is too
> much.
>
> I know about NutDelay which can be used to achieve that but it eats up the
> whole CPU and other threads are frozen which is bad for me, too. :-(
>
> I have a feeling that the clock ticks are interrupt driven. Is there a way
> to make these interrupts appear at higher frequency?
>
> Czerteak
>
> P.S.: Thanks for the previous help. The fault was (as usual) on my side ->
> one stupid wire was unplugged so the device reacted to more addresses than
> it was supposed to... :-(
>
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