Re: [ECOS] Performance counter interrupt on XScale

[Cristiano Ligieri Pereira <cpereira at ics dot uci dot edu>]

Hi,

This is my problem, more specifically. The processor is running at 600Mhz.
If I set the value of the counter as 0xFFFFFFFF - 60000000, which should
give me 10 interrupts (ticks) per second, it works fine. However, if I try
to get 100 interrupts per second (eCos default in most systems) setting
the counter to 0xFFFFFFFF - 6000000 I doesn't work. I simply get very long
delays (using cyg_thread_delay function), as opposed to get shorter delays
as it should work.

Any ideas why? 

Cristiano.

------------------------------------------------------------
Cristiano Ligieri Pereira - http://www.ics.uci.edu/~cpereira

On Thu, 23 Aug 2001, Cristiano Ligieri Pereira wrote:

> 
> Hi folks,
> 
> I'm trying to make the clock interrupt work properly on my XScale board
> but it doesn't seem to be working right. I'm using the same code as the
> IQ80310 port, but I'm using the version that implements it using the CCNT.
> The CCNT (clock counter) which is basically incremented every clock cycle
> and interrupts generating a IRQ when the maximum value (0xffffffff) is
> reached.
> 
> Independently of the initial value (RTC period) I'm assigning to the CCNT
> register the interrupts are being raised _quite_ slolwy (every 10 seconds
> approximately). Have anyone else had the same problem before? 
> 
> thanks,
> Cristiano.
> 
> ------------------------------------------------------------
> Cristiano Ligieri Pereira - http://www.ics.uci.edu/~cpereira
> 
>