Mikael Hjelm
HW,RedFox
Westermo Research and Development AB
Svalgången 1, Vallbyinstitutet
SE-724 81 Västerås
-----Bert Vermeulen <[email protected]> skrev: -----
Till: [email protected]
Från: Bert Vermeulen <[email protected]>
Datum: 2012-02-23 21:37
Ärende: Re: [sigrok-devel] Asix Sigma issue with 64bit ubuntu 11.10
On 02/18/2012 10:25 PM, Ondra Zoubek wrote:
> Hi,
> On 18.2.2012 14:01, Bert Vermeulen wrote:
>> That reminds me -- Håvard, can you please revisit the issue we had regarding
>> the zlib dependency? The problem was that the Asix firmware images are
>> zipped, and the resulting zlib dependency in libsigrok is actually only
>> there for for the Asix Sigma driver. We'd like to get rid of it, any chance
>> of providing the images uncompressed? Does the Asix license permit this?
>
> It seems that zlib dependency is kind of painful. Let's say it is not
> required to keep the images compressed, only xored with lsfr.
Ok, thanks Ondrej!
>> Also, another question: there is some reference to frequency counter
>> functionality that the Sigma driver apparently has. What's the story there,
>> can we support this? Because this is something I'd very much like to start
>> doing in sigrok as well.
>
> It is special configuration (you already have it) and it is quite simple
> to use it. Each frequency measuring unit (there are four of them in the
> FPGA, more did not fit in it) has three 32-bit counters, first is time
> (counter running at 50MHz), second is amount of time when input was high
> (to compute duty cycle) and third is number of rising edges of the input
> during the period. Start and stop is always aligned to input edge and
> measuring time is kept to be around 100ms, all this is done by the
> hardware, software only periodically reads these three registers and
> does the calculation. I will eventually provide the documentation of the
> register map. But I don't have it in document yet and I cannot do it
> before March.
That's fine, we're not quite ready for it yet. Thanks again!
--
Bert Vermeulen [email protected] email/xmpp
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