RE: [ECOS] Performance timing

[C B <csb_80 at hotmail dot com>]

Thanks Mike.  That was very helpful.

I guess my hope that I'd be able to make a simple call to get the time before and after my timed event was a little naive... :)



> Date: Fri, 16 Nov 2007 13:55:28 -0600
> From: arth2219@gmail.com
> To: csb_80@hotmail.com
> Subject: Re: [ECOS] Performance timing
> CC: gary@mlbassoc.com; ecos-discuss@ecos.sourceware.org
>
> On Nov 16, 2007 1:47 PM, C B  wrote:
>>
>> System profiling is probably what I need.
>>
>> Unfortunately there isn't an implementation of the profiling timer for my target. Any information or guidance available that you're aware of for implementing this?
>
> The eCos Reference Manual has this functionality documented:
> http://ecos.sourceware.org/docs-latest/ref/gprof.html
>
> It's pretty straight forward to implement with in your HAL. You'll
> need a spare hardware timer to use for your instrumentation. Try
> looking in other HALs that use the profile timer as an example.
>
> You need to setup two functions to implement the profile instrumentation:
> 1.) int hal_enable_profile_timer(int resolution)
> * Initializes hardware timer and ISR.
> 2.) unsigned int profile_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data,
> HAL_SavedRegisters *regs)
> * Saves current program counter
> * Handles timer hardware
>
> Good luck!
> Mike

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