Re: [Discuss-gnuradio] USRP drivers/test code

[Larry Doolittle]

Kalen and lurkers -

On Tue, Sep 27, 2005 at 04:22:18PM +0200, Kalen Watermeyer wrote:
> I'm trying to re-use the USRP code (where I can) for my own SDR device 
> which also uses the FX2 chip. I've managed to install the GnuRadio onto 
> my Debian system and have built the USRP source code.

I do this also.  It took a while to understand what's going on.

> When I run the usrp-0.8/host/apps/test_usrp_standard_rx executable I get 
> an 'usrp[0] device not found'
> 
> I realise that I've probably left off a thousand steps, but am a little 
> confused as to how to get things in order.
>
> Firstly, how do I ensure that the appropriate usb driver(s) are 
> associated with my usb device when I connect to the system?

Here is the outline of a few steps:
  1. Assign yourself a USB product ID in the space defined by
     firmware/include/usrp_ids.h, and get the USRP developers to
     acknowledge it.
  2. Hack host/lib/usrp_prims.cc to accept your PID in addition
     to the normal USRP ones.
  3. Program the FX2 EEPROM to your product ID using usrper i2c_write.
  4. Add a usermap file and initialization script to /etc/hotplug/usb/.

> Secondly, is it feasible to modify existing FX2 firmware to my own needs 
> for testing purposes? (as my FPGA/electronic setup are obviously very 
> different from the USRP)

Absolutely.  You can use a slightly modified usrper and
test_usrp_standard_rx to get yourself going until you build
your own customized executable from the libraries.

I suggest we take this discussion off-list, and maybe collaborate
on a web page summarizing the process.

      - Larry

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