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Diffstat (limited to 'host/docs')
| -rw-r--r-- | host/docs/usrp_n3xx.dox | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/host/docs/usrp_n3xx.dox b/host/docs/usrp_n3xx.dox index c9efa642d..482a97e44 100644 --- a/host/docs/usrp_n3xx.dox +++ b/host/docs/usrp_n3xx.dox @@ -396,6 +396,30 @@ For a list of which arguments can be passed into make(), see Section tx_lo_source | Initialize the source for the TX LO. | N310 | tx_lo_source=external rfic_digital_loopback | Digital data loopback inside the RFIC. | N310 | rfic_digital_loopback=1 +\subsection n3xx_usage_init Device Initialization + +To maximally speed up UHD, an initialization sequence is run when the device +(or more accurately, the MPM service) starts. This means even on the first run +of UHD, the device will already be initialized into a usable state. Note that +it will always come up in a default state, which can be changed by modifying the +configuration file in `/etc/uhd/mpm.conf` (see also \ref page_configfiles), +such as this: + +~~~{.ini} +; Note: To boot into a fully initialized state, a clock reference must be +; connected before turning the device on if it set to external here: +[n3xx] +clock_source=external +~~~ + +If you prefer not to have the device initialize on boot, but rather have a fast +boot time, add the line `skip_boot_init=1` to your `/etc/uhd/mpm.conf` file. + +For more details on the initialization sequence, see the corresponding section +for the specific N3XX device: +- \ref n3xx_mg_initialization + + \subsection n3xx_usage_subdevspec Subdev Specifications The four RF ports on the front panel correspond to the following subdev @@ -782,6 +806,24 @@ If you require a full re-initialization every time a UHD session is spawned, specify the `force_reinit` flag as a device arg. Specifying it will always do the full, slow initialization, but will guarantee a full reset of the RFIC. +To maximally speed up UHD, an initialization sequence is run when the device +(or more accurately, the MPM service) starts. This means even on the first run +of UHD, the device will already be initialized into a usable state. Note that +it will always come up in a default state, which can be changed by modifying the +configuration file in `/etc/uhd/mpm.conf` (see also \ref page_configfiles), +such as this: + +~~~{.ini} +; Note: To boot into a fully initialized state, a clock reference must be +; connected before turning the device on if it set to external here: +[n3xx] +master_clock_rate=122.88e6 +clock_source=external +~~~ + +If you prefer not to have the device initialize on boot, but rather have a fast +boot time, add the line `skip_boot_init=1` to your `/etc/uhd/mpm.conf` file. + \subsection n3xx_mg_calibrations RF Calibrations The onboard RFIC (AD9371) has built-in calibrations which can be enabled from |