diff options
| author | Thomas Tsou <ttsou@vt.edu> | 2012-07-23 13:19:13 -0400 |
|---|---|---|
| committer | Alexander Chemeris <Alexander.Chemeris@gmail.com> | 2013-06-24 01:46:10 +0400 |
| commit | 00ed1441a1a0edfc8e6ba7450475982464d6e4e0 (patch) | |
| tree | 185b3a2f854218f2d69359442287662445acfac8 | |
| parent | 8d804a4cd809dfd59fd60b4ee9c36f4230cfc4d7 (diff) | |
umtrx: flush any possible garbage bursts at start
In certain cases (higher sample-per-symbol counts), there is
some sensitivity to either timeouts or bad metadata on the
first packet. The first packet sets the transceiver clock, so
this is essential. As a workaround, drop the first 50 packets
to guarantee that we get a packet with a valid timestamp
Signed-off-by: Thomas Tsou <ttsou@vt.edu>
| -rw-r--r-- | Transceiver52M/UHDDevice.cpp | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/Transceiver52M/UHDDevice.cpp b/Transceiver52M/UHDDevice.cpp index c725696..f3bfeab 100644 --- a/Transceiver52M/UHDDevice.cpp +++ b/Transceiver52M/UHDDevice.cpp @@ -552,11 +552,13 @@ void uhd_device::restart(uhd::time_spec_t ts) uhd::rx_metadata_t md; uint32_t buff[rx_spp]; - usrp_dev->get_device()->recv(buff, - rx_spp, - md, - uhd::io_type_t::COMPLEX_INT16, - uhd::device::RECV_MODE_ONE_PACKET); + for (int i = 0; i < 50; i++) { + usrp_dev->get_device()->recv(buff, + rx_spp, + md, + uhd::io_type_t::COMPLEX_INT16, + uhd::device::RECV_MODE_ONE_PACKET); + } init_rd_ts = convert_time(md.time_spec, actual_smpl_rt); } |