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handling of timing drift in rfdevice

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This commit is contained in:
Raymond Knopp
2016-11-21 12:06:22 +08:00
parent 79bd3ea7d4
commit 958c66c6db
1 changed files with 11 additions and 2 deletions
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targets/RT/USER/lte-enb.c
+11 -2
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@@ -843,6 +843,8 @@ void rx_rf(PHY_VARS_eNB *eNB,int *frame,int *subframe) {
unsigned int rxs,txs;
int i;
int tx_sfoffset = 3;//(eNB->single_thread_flag == 1) ? 3 : 3;
openair0_timestamp old_ts;
if (proc->first_rx==0) {
// Transmit TX buffer based on timestamp from RX
@@ -876,6 +878,8 @@ void rx_rf(PHY_VARS_eNB *eNB,int *frame,int *subframe) {
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_READ, 1 );
old_ts = proc->timestamp_rx;
rxs = eNB->rfdevice.trx_read_func(&eNB->rfdevice,
&(proc->timestamp_rx),
rxp,
@@ -883,13 +887,18 @@ void rx_rf(PHY_VARS_eNB *eNB,int *frame,int *subframe) {
fp->nb_antennas_rx);
if (rxs != fp->samples_per_tti)
printf("Asked for %d samples, got %d from USRP\n",fp->samples_per_tti,rxs);
LOG_E(PHY,"rx_rf: Asked for %d samples, got %d from USRP\n",fp->samples_per_tti,rxs);
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_READ, 0 );
if (proc->first_rx == 1)
eNB->ts_offset = proc->timestamp_rx;
else {
if (proc->timestamp_rx - old_ts != fp->samples_per_tti) {
LOG_I(PHY,"rx_rf: rfdevice timing drift of %d samples\n",proc->timestamp_rx - old_ts);
eNB->ts_offset += (proc->timestamp_rx - old_ts);
}
}
proc->frame_rx = ((proc->timestamp_rx-eNB->ts_offset) / (fp->samples_per_tti*10))&1023;
proc->subframe_rx = ((proc->timestamp_rx-eNB->ts_offset) / fp->samples_per_tti)%10;
// synchronize first reception to frame 0 subframe 0