====== FPGA ======
<label>sec:FPGA</label>

For the work on the software-radio, we have two versions of the FPGA:

<ldl>
<ldt>STD</ldt><ldd>which is the standard off-the-shelf version, that works for SIG_COMPLEX_ICS and SIG_S16</ldd>
<ldt>GPS</ldt><ldd>which is used for the GPS SIG_COMPLEX_S16</ldd>
</ldl>

Both of these modes can be programmed using a simple Tool. This can be found in
the directory FPGA. If all you want is to
reprogram the FPGA, here is how to proceed:

  - cd into the directory
  - ./compile
  - program :
    * for the GPS-version:\\ ./program gps
    * for the standard-version:\\ ./program std

Of course, if you want to switch back and forth between versions, you don't have
to enter the "./compile"-command every
time.

===== Directories =====

<ldl>
<ldt>Module</ldt><ldd>The kernel-module to talk to the ics554-card</ldd>
<ldt>Program</ldt><ldd>The actual programmer for the FPGA</ldd>
<ldt>Api</ldt><ldd>The Application Programming Interface, the glue between //Module// and //Program//</ldd>
<ldt>inc</ldt><ldd>The include-files necessary</ldd>
</ldl>

All these files are nearly identical to the software delivered on the ICS-CDs of
the software-development pack. The only
change has been done to the //Program//, so that it accepts the command-line
switches and doesn't wait for a key.


===== Testing the version =====
<label>subsec:fpga-version</label>

Before running the radios it is a good idea to verify the version of the
program in the FPGA. This can be done by running the following program:

<code>
cd
$SRADIO/Test/FPGA
make test
</code>

This will tell you whether the actual program supports either STD or GPS mode.