usb ad9245.mht

This project attempts to stream high-speed ADC (or other digital) samples into a computer equipped w

href=3D"http://ccar.colorado.edu/opengps/usb/fx2_programmer.c">fx2_progra=
mmer.c</A>=20
        - Compile and copy binary somewhere=20
        <LI><A href=3D"http://libusb.sourceforge.net/">libusb</A> - USB =
library=20
        (<CODE>emerge libusb</CODE>) </LI></UL><A name=3Dtoc7></A>
      <H2>3.2. Install + Compile</H2>
      <P>Download the above files (install sdcc first, obviously). Then =
make=20
      some directory in your home dir and extract there: </P><PRE>cd ~
mkdir usb &amp;&amp; cd usb
wget http://ccar.colorado.edu/opengps/usb/usrp-0.8-swighack.tar.bz2
wget http://ccar.colorado.edu/opengps/usb/adcstream.tar.bz2
tar xjvf usrp-0.8-swighack.tar.bz2
tar xjvf adcstream.tar.bz2
cd usrp-0.8-swighack
./configure &amp;&amp; make
cd ../adcstream/firmware/lib &amp;&amp; make
cd ../src &amp;&amp; make
cd ../../host &amp;&amp; make
</PRE>
      <P>At this point there are two binaries that you care about: </P>
      <OL>
        <LI>adcstream/firmware/src/radar_firmware.ihx - firmware for the =
8051=20
        <LI>adcstream/host/rx - host-side receive software </LI></OL><A=20
      name=3Dtoc8></A>
      <H2>3.3. Program</H2>
      <P>To upload the firmware to the host (make sure to follow =
power-on=20
      procedure described above), just type </P><PRE>cd =
adcstream/firmware/src/
make program
</PRE>
      <P>This will scan the USB for the FX2 device and upload the hex =
file that=20
      you just compiled to it. Output should look something like this: =
</P><PRE>Using device 048 on bus 005 vendor id 0x04b4 product id 0x0081
Using file "radar_firmware.ihx"
Programming   6 bytes starting at 0x0000, checksum ok
Programming   3 bytes starting at 0x000b, checksum ok
Programming   3 bytes starting at 0x0013, checksum ok
Programming   3 bytes starting at 0x001b, checksum ok
Programming   3 bytes starting at 0x0023, checksum ok
--- snip ---
Programming  10 bytes starting at 0x0b7c, checksum ok
End of file
Using device 048 on bus 005 vendor id 0x04b4 product id 0x0081
Firmware upload done - 8051 running
</PRE>
      <P>Now the red D2 LED on the FX2 should start flashing ON/OFF at =
about 1Hz=20
      (this indicates that the firmware loaded correctly). </P>
      <P>Note that <CODE>make program</CODE> assumes you are <B>not =
root</B> and=20
      invokes the <CODE>sudo</CODE> command. If you don't have sudo, or =
just=20
      want to program as root, edit the makefile in =
<CODE>firmware/src</CODE> to=20
      not run sudo. </P><A name=3Dtoc9></A>
      <H2>3.4. Download ADC data</H2>
      <P>After programming the FX2 chip, we are now ready to download =
some ADC=20
      samples from it: </P><PRE>cd ~/usb/adcstream/host
sudo nice -n -20 ./rx -o /tmp/adc.bin
</PRE>
      <P>By default this will grab a 1GB (1024MB) dataset. =
<CODE>Ctrl-C</CODE>=20
      can be pressed at any time to abort the transfer - when you do =
this,=20
      output should look something like this: =
</P><PRE>[esterhui@tunesmith host]$sudo nice -n -20 ./rx -o /tmp/adc.bin
fusb::_reap: Interrupted system call
xfered 523 MB in 13.7 seconds.  38.16 MB/s.  cpu time =3D 2.212
</PRE>
      <P>We <CODE>nice</CODE> it to the highest priority so that the =
user-side=20
      linux scheduler give us as much time on the CPU as possible. Also, =
this=20
      host-side binary need to run as root. </P><A name=3Dtoc10></A>
      <H2>3.5. Viewing data in MATLAB</H2>
      <P>This data is saved as <CODE>unsigned 16 bit</CODE>. Remember =
that bit=20
      15 is tied to ground and bit 14 is over range detect flag (active =
high).=20
      Read it in MATLAB as follows: </P><PRE>fclose all; =
fid=3Dfopen('/tmp/adc.bin','rb'); data=3Dfread(fid,1e6,'uint16')
</PRE>
      <P></P>
      <P>Currently the buffer on the FX2 is not being cleared between =
downloads=20
      - I have not found a clean way to do this yet, so for now just =
accept that=20
      the first ~4MB of data might be bad. </P><A name=3Dtoc11></A>
      <H2>3.6. Troubleshooting</H2>
      <P>If you run the <CODE>rx</CODE> program and ctrl-C doesn't do it =
for you=20
      (the program doesn't quit), you have probably not followed the =
hardware=20
      setup procedure above closeley (or your input clock isn't =
working). In a=20
      case like this, type in <CODE>ctrl-Z</CODE> to stop the job, then =
do a=20
      <CODE>killall lt-rx</CODE> (as root), which will kill your =
<CODE>rx</CODE>=20
      application. </P></DIV><!-- FOOTER -->
      <DIV class=3Dfooter>
      <P class=3Dsmalltext><A =
href=3D"http://ccar.colorado.edu/opengps">OpenGPS</A>=20
      | <A href=3D"http://www.colorado.edu/">University of Colorado</A> =
</P>
      <P=20
      =
class=3Dsmalltext>U&nbsp;N&nbsp;I&nbsp;V&nbsp;E&nbsp;R&nbsp;S&nbsp;I&nbsp=
;T&nbsp;Y&nbsp;&nbsp;O&nbsp;F&nbsp;&nbsp;C&nbsp;O&nbsp;L&nbsp;O&nbsp;R&nb=
sp;A&nbsp;D&nbsp;O&nbsp;=20
      </P>
      <P class=3Dsmalltext><A class=3Dsmalltext=20
      =
href=3D"mailto:[e-mail]">stephan.esterhuizen@colo=
rado.edu</A>=20
      <BR><A class=3Dsmalltext =
href=3D"http://www.colorado.edu/legal.html">Copyright=20
      =C2=A9 2006</A> - The Regents of the University of Colorado =
</P></DIV>
      <P class=3Dsmalltext>Last modified: Thursday, 18-Aug-2005 21:54:46 =
MDT </P><!-- BODY_END --></TD></TR></TBODY></TABLE></BODY></HTML>

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