diff options
author | Josh Blum <josh@joshknows.com> | 2011-06-15 14:50:02 -0700 |
---|---|---|
committer | Josh Blum <josh@joshknows.com> | 2011-06-15 14:50:02 -0700 |
commit | 0cef788d3d34a298c975e32c488e800a5c65ccce (patch) | |
tree | 14b7f4242a28927b1701a73a3e8ec0df3fa04811 /host/docs/usrp_b1xx.rst | |
parent | 7951170c6161d9266726ec19e8c009500cf11f75 (diff) | |
parent | 27f1622d439ceb787e7dada733d0eb82270c5532 (diff) | |
download | uhd-0cef788d3d34a298c975e32c488e800a5c65ccce.tar.gz uhd-0cef788d3d34a298c975e32c488e800a5c65ccce.tar.bz2 uhd-0cef788d3d34a298c975e32c488e800a5c65ccce.zip |
Merge branch 'next'
Diffstat (limited to 'host/docs/usrp_b1xx.rst')
-rw-r--r-- | host/docs/usrp_b1xx.rst | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/host/docs/usrp_b1xx.rst b/host/docs/usrp_b1xx.rst new file mode 100644 index 000000000..2f7385070 --- /dev/null +++ b/host/docs/usrp_b1xx.rst @@ -0,0 +1,76 @@ +======================================================================== +UHD - USRP-B1XX Series Application Notes +======================================================================== + +.. contents:: Table of Contents + +------------------------------------------------------------------------ +Specify a non-standard image +------------------------------------------------------------------------ +The UHD will automatically select the USRP B-Series images from the installed images package. +The image selection can be overridden with the "fpga" and "fw" device address parameters. + +Example device address string representations to specify non-standard images: + +:: + + fpga=usrp_b100_fpga_firmware.bin + + -- OR -- + + fw=usrp_b100_fw_firmware.ihx + +------------------------------------------------------------------------ +Changing the master clock rate +------------------------------------------------------------------------ +The master clock rate of the USRP embedded feeds both the FPGA DSP and the codec chip. +Hundreds of rates between 32MHz and 64MHz are available. +A few notable rates are: + +* 64MHz - maximum rate of the codec chip +* 61.44MHz - good for UMTS/WCDMA applications +* 52Mhz - good for GSM applications + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Set 61.44MHz - uses external VCXO +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +To use the 61.44MHz clock rate, the USRP embedded will require two jumpers to be moved. + +* J16 is a two pin header, remove the jumper (or leave it on pin1 only) +* J15 is a three pin header, move the jumper to (pin1, pin2) + +**Note:** See instructions below to communicate the desired clock rate into the UHD. + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Set other rates - uses internal VCO +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +To use other clock rates, the jumpers will need to be in the default position. + +* J16 is a two pin header, move the jumper to (pin1, pin2) +* J15 is a three pin header, move the jumper to (pin2, pin3) + +To communicate the desired clock rate into the UHD, +specify the a special device address argument, +where the key is "master_clock_rate" and the value is a rate in Hz. +Example: +:: + + uhd_usrp_probe --args="master_clock_rate=52e6" + +------------------------------------------------------------------------ +OS specific notes +------------------------------------------------------------------------ + +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Linux - setup udev +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +On Linux, udev handles USB plug and unplug events. +The following commands create a udev rule for the B100 +so that non-root users may access the device: + +:: + + echo 'ACTION=="add", BUS=="usb", SYSFS{idVendor}=="2500", SYSFS{idProduct}=="0001", MODE:="0666"' > tmpfile + sudo chown root.root tmpfile + sudo mv tmpfile /etc/udev/rules.d/10-usrp_b100.rules + sudo udevadm control --reload-rules |