adding support for beamforming (control of GPIO) for FR2

executables/nr-ru.c

@@ -751,6 +751,18 @@ void tx_rf(RU_t *ru,int frame,int slot, uint64_t timestamp) {
       flags = 3; // end of burst
     }
 
+    if (fp->freq_range==nr_FR2) {
+      // the beam index is written in bits 8-10 of the flags
+      // bit 11 enables the gpio programming
+      int beam=0;
+      if (slot==0 || slot==40) beam=0&8;
+      if (slot==10 || slot==50) beam=1&8;
+      if (slot==20 || slot==60) beam=2&8;
+      if (slot==30 || slot==70) beam=3&8;
+
+      flags |= beam<<8;
+    }
+    
     VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_TRX_WRITE_FLAGS, flags ); 
     VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_FRAME_NUMBER_TX0_RU, frame );
     VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_TTI_NUMBER_TX0_RU, slot );

targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp

@@ -276,14 +276,17 @@ static int trx_usrp_start(openair0_device *device) {
 
   // setup GPIO for TDD, GPIO(4) = ATR_RX
   //set data direction register (DDR) to output
-  s->usrp->set_gpio_attr("FP0", "DDR", 0x7f, 0x7f);
-  //set control register to ATR
-  s->usrp->set_gpio_attr("FP0", "CTRL", 0x7f,0x7f);
+  s->usrp->set_gpio_attr("FP0", "DDR", 0xfff, 0xfff);
+  //set lower 7 bits to be controlled automatically by ATR (the rest 5 bits are controlled manually) 
+  s->usrp->set_gpio_attr("FP0", "CTRL", 0x7f,0xfff);
   //set pins 4 (RX_TX_Switch) and 6 (Shutdown PA) to 1 when the radio is only receiving (ATR_RX)
   s->usrp->set_gpio_attr("FP0", "ATR_RX", (1<<4)|(1<<6), 0x7f);
   // set pin 5 (Shutdown LNA) to 1 when the radio is transmitting and receiveing (ATR_XX)
   // (we use full duplex here, because our RX is on all the time - this might need to change later)
   s->usrp->set_gpio_attr("FP0", "ATR_XX", (1<<5), 0x7f);
+  // set the output pins to 0
+  s->usrp->set_gpio_attr("FP0", "OUT", 7<<7, 0xf80);
+
   // init recv and send streaming
   uhd::stream_cmd_t cmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
   LOG_I(HW,"Time in secs now: %llu \n", s->usrp->get_time_now().to_ticks(s->sample_rate));
@@ -404,10 +407,19 @@ static int trx_usrp_write_recplay(openair0_device *device, openair0_timestamp ti
       @param antenna_id index of the antenna if the device has multiple antennas
       @param flags flags must be set to TRUE if timestamp parameter needs to be applied
 */
-static int trx_usrp_write(openair0_device *device, openair0_timestamp timestamp, void **buff, int nsamps, int cc, int flags) {
+static int trx_usrp_write(openair0_device *device,
+			  openair0_timestamp timestamp,
+			  void **buff,
+			  int nsamps,
+			  int cc,
+			  int flags) {
   int ret=0;
   usrp_state_t *s = (usrp_state_t *)device->priv;
   int nsamps2;  // aligned to upper 32 or 16 byte boundary
+
+  int flags_lsb = flags&0xff;
+  int flags_msb = (flags>>8)&0xff;
+    
 #if defined(__x86_64) || defined(__i386__)
   #ifdef __AVX2__
       nsamps2 = (nsamps+7)>>3;
@@ -441,27 +453,28 @@ static int trx_usrp_write(openair0_device *device, openair0_timestamp timestamp,
 
     boolean_t first_packet_state=false,last_packet_state=false;
 
-    if (flags == 2) { // start of burst
+    if (flags_lsb == 2) { // start of burst
       //      s->tx_md.start_of_burst = true;
       //      s->tx_md.end_of_burst = false;
       first_packet_state = true;
       last_packet_state  = false;
-    } else if (flags == 3) { // end of burst
+    } else if (flags_lsb == 3) { // end of burst
       //s->tx_md.start_of_burst = false;
       //s->tx_md.end_of_burst = true;
       first_packet_state = false;
       last_packet_state  = true;
-    } else if (flags == 4) { // start and end
+    } else if (flags_lsb == 4) { // start and end
     //  s->tx_md.start_of_burst = true;
     //  s->tx_md.end_of_burst = true;
       first_packet_state = true;
       last_packet_state  = true;
-    } else if (flags==1) { // middle of burst
+    } else if (flags_lsb==1) { // middle of burst
     //  s->tx_md.start_of_burst = false;
     //  s->tx_md.end_of_burst = false;
       first_packet_state = false;
       last_packet_state  = false;
-    } else if (flags==10) { // fail safe mode
+    }
+    else if (flags_lsb==10) { // fail safe mode
      // s->tx_md.has_time_spec = false;
      // s->tx_md.start_of_burst = false;
      // s->tx_md.end_of_burst = true;
@@ -469,12 +482,22 @@ static int trx_usrp_write(openair0_device *device, openair0_timestamp timestamp,
      last_packet_state  = true;
     }
 
+    
     s->tx_md.has_time_spec  = true;
     s->tx_md.start_of_burst = (s->tx_count==0) ? true : first_packet_state;
     s->tx_md.end_of_burst   = last_packet_state;
     s->tx_md.time_spec      = uhd::time_spec_t::from_ticks(timestamp, s->sample_rate);
     s->tx_count++;
 
+    // bit 3 enables gpio (for backward compatibility)
+    if (flags_msb&8) {
+      // push GPIO bits 7-9 from flags_msb
+      int gpio789=(flags_msb&7)<<7;
+      s->usrp->set_command_time(s->tx_md.time_spec);
+      s->usrp->set_gpio_attr("FP0", "OUT", gpio789, 0x380);
+      s->usrp->clear_command_time();
+    }
+
     if (cc>1) {
       std::vector<void *> buff_ptrs;
 
@@ -482,7 +505,11 @@ static int trx_usrp_write(openair0_device *device, openair0_timestamp timestamp,
         buff_ptrs.push_back(&(((int16_t *)buff_tx[i])[0]));
 
       ret = (int)s->tx_stream->send(buff_ptrs, nsamps, s->tx_md);
-    } else ret = (int)s->tx_stream->send(&(((int16_t *)buff_tx[0])[0]), nsamps, s->tx_md);
+    } 
+    else {
+      ret = (int)s->tx_stream->send(&(((int16_t *)buff_tx[0])[0]), nsamps, s->tx_md);
+    }
+
   if (ret != nsamps) LOG_E(HW,"[xmit] tx samples %d != %d\n",ret,nsamps);
 
   return ret;

targets/PROJECTS/GENERIC-LTE-EPC/CONF/gnb.band257.tm1.32PRB.usrpx300.conf

@@ -148,7 +148,7 @@ gNBs =
 # ssb_PositionsInBurs_BitmapPR
 # 1=short, 2=medium, 3=long
       ssb_PositionsInBurst_PR                                       = 3;
-      ssb_PositionsInBurst_Bitmap                                   = 1;
+      ssb_PositionsInBurst_Bitmap                                   = 0x100000001L;
 
 # ssb_periodicityServingCell
 # 0 = ms5, 1=ms10, 2=ms20, 3=ms40, 4=ms80, 5=ms160, 6=spare2, 7=spare1 
@@ -170,8 +170,8 @@ gNBs =
       # pattern1 
       # dl_UL_TransmissionPeriodicity
       # 0=ms0p5, 1=ms0p625, 2=ms1, 3=ms1p25, 4=ms2, 5=ms2p5, 6=ms5, 7=ms10
-      dl_UL_TransmissionPeriodicity                                 = 6;
-      nrofDownlinkSlots                                             = 30;
+      dl_UL_TransmissionPeriodicity                                 = 5;
+      nrofDownlinkSlots                                             = 10;
       nrofDownlinkSymbols                                           = 0;
       nrofUplinkSlots                                               = 10;
       nrofUplinkSymbols                                             = 0;
@@ -237,8 +237,8 @@ RUs = (
          max_pdschReferenceSignalPower = -27;
          max_rxgain                    = 114;
          eNB_instances  = [0];
-	 sdr_addrs = "type=x300";
-         if_freq = 3000000000;
+	 sdr_addrs = "addr=192.168.10.2,second_addr=192.168.20.2";
+         if_freq = 5300000000;
     }
 );