Table of Contents
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
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:
To use the 61.44MHz clock rate, the USRP embedded will require two jumpers to be moved.
Note: See instructions below to communicate the desired clock rate into the UHD.
To use other clock rates, the jumpers will need to be in the default position.
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"
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