Re: [Discuss-gnuradio] Reprogram FPGA

[Roshan Baliga]

S Mande wrote:
> 1) Do I need a 3rd party tool to transfer my code to the FPGA on USRP ? 
> I remember using a JTAG cable and Active-HDL for this task when i worked 
> with Aldec procesors.

I'm sure there are multiple ways to do this, but I just use the existing 
 usrp framework to load the RBF file onto the fpga. That is, when I 
generate a new RBF file, I throw it into 
/usr/local/share/usrp/rev4/std_2rxhb_2tx.rbf and load it up with my own 
C application that links to libusrp.so. It's the quick and dirty way, 
but hey, it works.

> 2) I believe that the firmware is loaded everytime I run GNU radio. Is 
> it that I replace the existing fpga Verilog firmware code ( .v file 
> ) from its existing location .i.e. gnuradio folder
> with my modified Verilog firmware code ?

The RBF file that is loaded is picked up from a predetermined location. 
In my case, with a rev 4 usrp, it's 
/usr/local/share/usrp/rev4/std_2rxhb_2tx.rbf. In your quartus project, 
the file you want is in usrp/fpga/toplevel/usrp_std/usrp_std.rbf

If you replace the file in /usr/local... with a new rbf file, the 
gnuradio code will load it next time you power cycle/run the USRP.

-Roshan