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Diffstat (limited to 'host/docs/usrp1.rst')
| -rw-r--r-- | host/docs/usrp1.rst | 56 |
1 files changed, 29 insertions, 27 deletions
diff --git a/host/docs/usrp1.rst b/host/docs/usrp1.rst index 7cf447719..0baa93a45 100644 --- a/host/docs/usrp1.rst +++ b/host/docs/usrp1.rst @@ -60,6 +60,29 @@ Example device address string representations to specify non-standard firmware a fpga=usrp1_fpga_4rx.rbf, fw=usrp1_fw_custom.ihx +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Change USB transfer parameters +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +The advanced user may manipulate parameters of the usb bulk transfers +for various reasons, such as lowering latency or increasing buffer size. +By default, the UHD will use values for these parameters +that are known to perform well on a variety of systems. +The following device address parameters can be used to manipulate USB bulk transfers: + +* **recv_xfer_size:** the size of each receive bulk transfer in bytes +* **recv_num_xfers:** the number of simultaneous receive bulk transfers +* **send_xfer_size:** the size of each send bulk transfer in bytes +* **send_num_xfers:** the number of simultaneous send bulk transfers + +Example usage, set the device address markup string to the following: +:: + + serial=12345678, recv_num_xfers=16 + + -- OR -- + + serial=12345678, recv_xfer_size=2048, recv_num_xfers=16 + ------------------------------------------------------------------------ Specifying the subdevice to use ------------------------------------------------------------------------ @@ -95,36 +118,15 @@ Notice that the subdevice name is always specified in the 3 possible cases. B:B - ------------------------------------------------------------------------- -Change USB transfer parameters ------------------------------------------------------------------------- -The advanced user may manipulate parameters of the usb bulk transfers -for various reasons, such as lowering latency or increasing buffer size. -By default, the UHD will use values for these parameters -that are known to perform well on a variety of systems. - -The following device address can be used to manipulate USB bulk transfers: - -* **recv_xfer_size:** the size of each receive bulk transfer in bytes -* **recv_num_xfers:** the number of simultaneous receive bulk transfers -* **send_xfer_size:** the size of each send bulk transfer in bytes -* **send_num_xfers:** the number of simultaneous send bulk transfers - -Example, set the args string to the following: -:: - - serial=12345678, recv_num_xfers=16 - ------------------------------------------------------------------------ OS Specific Notes ------------------------------------------------------------------------ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -Setup Udev on Linux +Linux - setup udev ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -On Linux, Udev handles USB plug and unplug events. -The following command creates a Udev rule for the USRP1 +On Linux, udev handles USB plug and unplug events. +The following commands create a udev rule for the USRP1 so that non-root users may access the device: :: @@ -135,8 +137,8 @@ so that non-root users may access the device: sudo udevadm control --reload-rules ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -Install libusb driver on Windows +Windows - install driver ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ On Windows, a driver must be installed the first time the USRP1 is attached to the host computer. -A download link for this driver can be found on the Ettus Research UHD wiki page. -Download and unpack the driver, and direct the Windows driver install wizard to the *.inf file. +A download link for this driver can be found on the UHD wiki page. +Download and unpack the driver, and direct the Windows driver install wizard to the .inf file. |