Re: [Hamlib-developer] USB Digital World Traveller

[Stephane F. <f8...@fr...>]

Hi Menno,

On Tue, Jun 21, 2005 at 05:15:52PM +0200, Menno Bakker wrote:
> I did some usb sniffing on the DWT, and I was able to find back the
> frequencies that I send to it in the logs. I guess that setting the
> frequency is all you need to do, there are not many more options in the CT
> software that directly apply to the DWT. I don't know much about USB, so I
> don't know what info you would need exactly, but the sniff logs are HUGE,
> just sniffing for a few seconds gives megabytes of data. 
> I can send you just the data that has the frequencies in them, or the whole
> logs. I could make them available for download somewhere.

Only the frequencies in the logs are necessary. The tons of other logs
are the audio traffic of the Micronas soundcard, which is of no interest
to Hamlib (but is to Dream).
I don't know the format of the logs, but it should be possible to grep in
them to select the right ID's pertaining to the frequency tuning control.

BTW, what is the frequency format? integer? BCD? other?
You can send the logs of the frequency direct to my e-mail.

According to the following page, the DWT can receive also WFM:
http://www.rigpix.com/dabdrm/codingtechnologies_digitalworldtraveller.htm
Do you know if the WFM is demodulated in software (by the PC) or not?
I don't think so, because otherwise the audio soundcard would have
to sample at about 230 kSamples/s, which is not very common :)

If possible, I will need separate frequency logs when WFM is selected.

> The DWT device uses some kind of universal USB driver from Micronas, it's
> basically an USB soundcard with a radio receiver attached to the microphone
> input. Maybe this info helps with finding the initialisation process, maybe
> there already is some linux driver for a micronas based USB soundcard?

As long as the Micronas soundcard is USB audio compliant, there's good
chances for it to work as-is. Have you (or Colin) tried to plug in the
DWT USB cable under a Linux system and see if alsa or oss detected and
recognized a standard USB audio device?

Is it possible to open the DWT and see what components populate it?
Can you get some references of chips like the one that is responsible
for the USB in the device?

Cheers,
-- 
Stephane