Re: [ts-7000] Re: MAX197 ADC interfacing

[anand bhavnani <>]

Hi All,

 

Jim u wrote about 2 differnt programmes having different cpu utilisation..

how can one come to a conclusion what exact cpu utilisation is a programme doing ...

and on factors does the cpu utilisation for a particular programme depend..

 

good bye,

 

yours,

anand.

Jim Jackson <> wrote:

> Hi Phil,
>
> On Sun, 12 Feb 2006, Phil wrote:
>
> ...snip.....
> > Firstly I tried a quick and dirty program 'example2.c' (see below)
> > to sample one channel at 22.05kHz, it was able to do it however the
> > cpu utilisation was at ~70% and there were glitches in the audio.
> >
> > So then I changed the way the prog received the data 'example3.c'
> > (see below) to do the!
>   same
>  sampling. Much better cpu utilisation of
> > just 3% and absolutely perfect audio (for 22.05kHz mono). No
> > noticable freq shift from an inaccurate sampling clock, no glitches.
> > Also, I had the program writing the output over the network via NFS.
> > I did try at 44.1kHz but the driver had issues, I guess that's
> > getting a bit high but still I will look into it.
>
> You beat me to it. I read your code last night, and was going to ask what
> samplerate (interrupt) rate you thought could be sustained. It appears the
> answer is - it depends :-) I'm surprized that 22.05KHz was sustainable,
> and that's really really impressive. Opens up a whole new range of apps.
>
> Many thanks for the code and for sharing your efforts. Now to build the
> use the module.......
>
> cheers
> Jim



" MINDSET: Its Everything " Anonymous

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