On Mon, Jul 15, 2013 at 10:54 PM, Thomas Tsou <[email protected]> wrote: > On Mon, Jul 15, 2013 at 1:19 PM, Alexander Chemeris > <[email protected]> wrote: >> On Mon, Jul 15, 2013 at 2:35 PM, Thomas Tsou <[email protected]> wrote: >>> This is a very positive patch set. As you very well know, the power >>> on/off handling was in a ugly state. One of the remaining issue with >>> UHD start/stop is that the device clock is reset to zero at restart, >>> but not all of the timestamp counters are reset in radioInterface. The >>> radioInterface is not stopped at all until deallocation since >>> 'POWEROFF' is an empty command. >> >> I made an attempt to implement it in the 806a64b1 patch. If you check >> out this commit, you should get the assert during TURN ON/OFF/ON >> sequence. To start/stop transceiver I use scripts attached to this >> e-mail. > > There does seem to be something strange going on with UHD. After restart and > clock reset the device is reporting time correctly, but subsequent packets > do not reflect the change. We've had similar issues before due to lingering > packets in the socket buffers, but the same fix (flushing buffers after > issuing STREAM_MODE_STOP) doesn't fix the issue. > > Rx timestamp 10.3679 > Rx timestamp 10.3698 > ----POWEROFF---- > ----POWERON---- > UHD device time 0.00440694 > Rx timestamp 10.3732 > > This may be a bug in UHD, or some oddity in the UHD streamer interface. I'm > going to try it with an outside test case.
Worst case we should be able to align the transceiver clock with UHD instead of resetting UHD clock. -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru
