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Diffstat (limited to 'host/docs/usrp2.rst')
| -rw-r--r-- | host/docs/usrp2.rst | 49 |
1 files changed, 11 insertions, 38 deletions
diff --git a/host/docs/usrp2.rst b/host/docs/usrp2.rst index 4c95fb24c..0ddcaa4e5 100644 --- a/host/docs/usrp2.rst +++ b/host/docs/usrp2.rst @@ -158,7 +158,7 @@ The value for the addr key is a white-space separated list of IPv4 addresses or resolvable hostnames. The first address in the list will represent channel 0, the second channel 1, and so on... -Use this addressing scheme with the *mimo_usrp* interface. +Use this addressing scheme with the *multi_usrp* interface. The device address string representation for 2 USRP2s with IPv4 addresses 192.168.10.2 and 192.168.20.2 :: @@ -166,49 +166,22 @@ The device address string representation for 2 USRP2s with IPv4 addresses 192.16 addr=192.168.10.2 192.168.20.2 ------------------------------------------------------------------------ -Resize the send and receive buffers +Hardware setup notes ------------------------------------------------------------------------ -It may be useful increase the size of the socket buffers to -move the burden of buffering samples into the kernel, or to -buffer incoming samples faster than they can be processed. -However, if you application cannot process samples fast enough, -no amount of buffering can save you. - -By default, the UHD will try to resize both the send and receive buffer for optimum performance. -A warning will be printed on instantiation if the actual buffer size is insufficient. -See the OS specific notes below: - -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -OS specific notes -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -On linux, the maximum buffer sizes are capped by the sysctl values -**net.core.rmem_max** and **net.core.wmem_max**. -To change the maximum values, run the following commands: -:: - - sudo sysctl -w net.core.rmem_max=<new value> - sudo sysctl -w net.core.wmem_max=<new value> - -Set the values permanently by editing */etc/sysctl.conf* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -Device address params +Front panel LEDs ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -To manually set the size of the buffers, -the usrp2 will accept two optional parameters in the device address. -Each parameter will accept a numeric value for the number of bytes. - -* recv_buff_size -* send_buff_size - -Example, set the args string to the following: -:: +The LEDs on the front panel can be useful in debugging hardware and software issues. +The LEDs reveal the following about the state of the device: - addr=192.168.10.2, recv_buff_size=100e6 +* **LED A:** transmitting +* **LED B:** undocumented +* **LED C:** receiving +* **LED D:** firmware loaded +* **LED E:** undocumented +* **LED F:** FPGA loaded ------------------------------------------------------------------------- -Hardware setup notes ------------------------------------------------------------------------- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Ref Clock - 10MHz |