[hpsdr] ozy / janus

[Bill Tracey]

Chris did a good job of summarizing what we'll do out of the box.  To recap 
and add some details:

Out of the box Janus+Ozy should be usable for audio with an SDR 1000, 
SoftRock, Firefly using a modified version of PowerSDR - I expect to add 
these mods to the mainline Flex-Radio distribution of PowerSDR once they 
are all done   We'll do 24 bit receive sampling @ 48, 96 and 192 khz 
sampling rates.   We'll do xmit sampling at 48 and possibly (need to add 
software support) 96 khz, 16 bits.   We have the facility to take in a 10 
Mhz reference signal to lock the audio ADC and DAC's to so we can be very 
accurate for frequency,   We also have capability to hook a key to the 
Janus board which gives us very low latency keying since the keying data 
rides along with the audio data.   All of this is working today and has 
been working for few months now.

We should also be able to control an SDR 1000 via the Ozy USB connection 
and a parallel cable from Ozy to the SDR 1000.  I'm currently doing this 
bit of code and mods for PowerSDR and would expect  to have it done and 
ready for public consumption by the time boards start getting into folks 
hands.   This will get us to the one cable to the computer ideal  SDR 1k 
folks have wanted for  long time.

One caveat on Janus - it is not a Windows sound card, so you will not be 
able to use it with any old sound card program.  I will be licensing the 
code that access sound under Janus as an LGPL library so other non GPL 
licensed ham radio programs can be modified to use Janus.    The remainder 
of the  PowerSDR mods and Janus/Ozy support code is licensed under the GPL.

To date all of the work on Ozy+Janus has been done on Windows -- there is 
no reason we could not work with Linux - the core communication protocol 
from computer to Ozy is via libusb which exists for both Linux and 
Windows.  To do development for the FPGA and CPLD one will need the  Altera 
tools which I believe are free only on Windows.

As Chris stated programming the CPLD is via ByteBlaster or suitable clone, 
and programming the FPGA is typically done at initialization when plugged 
into the PC.  We'd like to be able to program the CPLD via Ozy and USB -- 
physically we've got all we need to do it, just a matter of writing some 
software.  I don't expect this software will be written by the time the 
board comes out - there's an existing open source project ( 
http://www.ixo.de/info/usb_jtag/ ) that does USB JTAG programming using an 
FX2 - I'd expect we'd port this over to our environment.   We will probably 
need this capability for Penelope and Mercury as I they will likely have 
FPGAs but not a direct connection to the PC, so we will have to be able to 
program their FPGA's via Ozy and the Atlas bus.

To summarize -- the programmable devices on Ozy are:

FX2 Microcontroller - Code is built using SDCC, code is loaded via USB when 
the device is Initialized
FPGA - Altera Quartus Web Edition to develop it, utilities available to 
program via USB

And on Janus
CPLD - Persistent device - will be loaded as part of test process with a 
useful image.  Can be reloaded via ByteBlaster JTAG header or in the future 
via USB and Ozy.

All of the FX2, FPGA and CPLD code is GPL  licensed and is available on the 
HPSDR SVN server.  For an experimenter, this should be a very nice platform 
to work with. Ozy is quite a nice  FPGA development system.     Janus is an 
excellent A/D converter -- I'd love to see someone feed it with a balanced 
inputs from a mixer and appropriately tuned gain to exploit the range it has.

I'd be interested in hearing from the experimenter folks on the list what 
they hope to do with Ozy and/or Janus.  Hoping we've got  a lot of fun 
ahead of us with these boards.

Cheers,

Bill (kd5tfd)


At 11:53 AM 2/13/2007, FRANCIS CARCIA wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>
>I wonder if usable code will be loaded into the FPGAs. I wonder if someone 
>could tell us lurkers what the production units will do out of the box. 
>I'm thinking this would be a good project to expand my hackware skills. 
>Also what kind of tools will be required to read source code change 
>compile and load different FPGA firmware. Good prices wa1gfz



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