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Re: [Xylo-SDR] Saxo
Hi Chris and Phil,
I would like to implement a USB Audio device exactly in order to avoid
having to write any device driver software on the PC side. The USB Audio
Class device specification should not be too complex to implement in the
FX2 (I hope). I have recently acquired the TUSB3200 chip, which is an
embedded USB Audio stream controller. It does however only support USB
full speed (12 Mbps), which will limit the sampling rate to 96 kHz
half-duplex. This is ok for me at the moment since I do intend to use my
laptop internal soundcard for mic and speaker.
I wish the FX2 had an I2S interface!
In my little project, I would like to focus on the implementation of a
96 kHz half-duplex USB soundcard (USB Audio specification) and a
generic parallel I/O port (USB HID specification). Everything in a
single little board. Anyone on the list interested in joining efforts?
Phil Harman wrote:
I have a prototype full duplex USB2 sound card going based on the
Wolfson A/D chip and Xylo/Saxo FPGA board. At the moment it runs at
48k and 16 bits but the chip can do 192k and 24 bit. Need to walk
first but the pace is picking up!
Writing a generic USB Audio Device driver is way beyond me. Our aim is
to keep the interface to the A/D converter inside the PC as simple as
possible so I don't see the need for a 'real' device driver - we are
not trying to compete with the D44 for example.
----- Original Message -----
*From:* Christopher T. Day <mailto:CTDay@lbl.gov>
*To:* email@example.com <mailto:firstname.lastname@example.org>
*Sent:* Sunday, January 22, 2006 10:29 AM
*Subject:* [Xylo-SDR] Saxo
What few useful thoughs I've had so far on the subject agree with
yours - if possible [does the USB Audio Device spec go as far as
24-bit stereo, 96/192 ksamples/sec?], the USB-2 interface should
be able to use a generic USB Audio Device driver => we don't have
to supply/maintain one for any/all OS. But then, I know almost
Chris - AE6VK