Re: [Discuss-gnuradio] Automatically Restart UHD/gr-uhd blocks

[Martin Braun]

On 02/19/2015 12:14 AM, John Malsbury wrote:
> Dan,
> 
> I think you were working a different, USB-related issues.
> 
> My task is a bit different.  The goal is not to power cycle the USRPs -
> its to re-initialize and resume after and power cycle, without
> intervention from an external executive or operator.  (ie. by some task
> that monitors for a stop in dataflow and then perhaps calls a re-init
> function in gr-uhd, or rebuilds a flowgraph entirely)

This has been mentioned before, but we've never made a plan to fix this.
One issue is that if the USRP conks out, this usually means the block
breaks down -- so the issue is not so much recovering the multi_usrp,
but rather making sure the usrp_{sink,source} blocks keep running when
the USRP has some issues.

M


> 
> -John
> 
> On Wed, Feb 18, 2015 at 3:06 PM, Dan CaJacob <address@hidden
> <mailto:address@hidden>> wrote:
> 
>     I worked around a problem like this by installing an in-line power
>     relay in my remote nodes.  Not ideal, but in some rare situations,
>     even forcing the FPGA to reload was not successful.  Sometimes a
>     power cycle was the only hope.
> 
>     That said, I've heard some lovely things about reset commands
>     available for the newer boards, but it's not clear to me if they are
>     integrated into the driver.  Seems likely, though.
> 
>     Very Respectfully,
> 
>     Dan CaJacob
> 
>     On Wed, Feb 18, 2015 at 4:29 PM, John Malsbury
>     <address@hidden <mailto:address@hidden>>
>     wrote:
> 
>         I've recently received a request to have GNU Radio flowgraphs
>         recover gracefully in the event of power glitches, or transient
>         Ethernet anomalies that are severe enough to break the
>         dataflow.  ie. the event should be noted, but there should be a
>         way to re-init the USRP for continued operation with restart the
>         .py.
> 
>         I haven't really been keeping up. 
> 
>           * Has there been any discussion on how we might modify gr-uhd,
>             and maybe UHD, to allow automatic re-initialization of the
>             USRP? 
>           * If not, is this a reasonable place to brainstorm on the
>             problem? 
>           * Has anyone already solved this?
> 
>         It doesn't seem that complex, but I'd like to pick the most
>         straight-forward path. 
> 
>         -John
> 
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