added duplex_mode to openair0_lib

added support for TDD for EXMIMO

targets/ARCH/COMMON/common_lib.h

@@ -60,6 +60,11 @@ typedef enum {
   max_gain=0,med_gain,byp_gain
 } rx_gain_t;
 
+typedef enum {
+  duplex_mode_TDD=1,duplex_mode_FDD=0
+} duplex_mode_t;
+
+
 /** @addtogroup _PHY_RF_INTERFACE_
  * @{
  */
@@ -76,6 +81,8 @@ typedef struct {
   int Mod_id;
   // device log level
   int log_level;
+  //! duplexing mode
+  duplex_mode_t duplex_mode;
   //! number of downlink resource blocks
   int num_rb_dl;
   //! number of samples per frame 

targets/ARCH/EXMIMO/DEFS/pcie_interface.h

@@ -316,7 +316,9 @@ typedef struct {
 //
 //    In TDD mode, there are two ways to control the RX/TX switch:
 //    1. using the LSB from the TX data (TXRXSWITCH_LSB)
+//       only the LSB from RF chain set in the ACTIVE_RF register controls the switch on all the chains
 //    2. using FPGA logic, based on switch_offset[0..3]
+//       this mode is not tested well and should be used with care
 #define DUPLEXMODE_MASK   (1<<0)
 #define DUPLEXMODE_FDD     0
 #define DUPLEXMODE_TDD    (1<<0)
@@ -330,6 +332,11 @@ typedef struct {
 #define SWITCHSTATE_1     (1<<3)
 #define TEST_ADACLOOP_MASK  (1<<4)
 #define TEST_ADACLOOP_EN    (1<<4)
+#define ACTIVE_RF_MASK      (15<<5)
+#define ACTIVE_RF_1         (1<<5)
+#define ACTIVE_RF_2         (2<<5)
+#define ACTIVE_RF_3         (4<<5)
+#define ACTIVE_RF_4         (8<<5)
 
 typedef enum {
   BW5,

targets/ARCH/EXMIMO/USERSPACE/LIB/openair0_lib.c

@@ -296,6 +296,7 @@ int openair0_config(openair0_config_t *openair0_cfg, int UE_flag)
   int ant, card;
   int resampling_factor=2;
   int rx_filter=RXLPF25, tx_filter=TXLPF25;
+  int ACTIVE_RF=0;
 
   exmimo_config_t         *p_exmimo_config;
   exmimo_id_t             *p_exmimo_id;
@@ -315,8 +316,6 @@ int openair0_config(openair0_config_t *openair0_cfg, int UE_flag)
     else
       p_exmimo_config->framing.eNB_flag   = !UE_flag;
 
-    p_exmimo_config->framing.tdd_config = DUPLEXMODE_FDD + TXRXSWITCH_LSB;
-
     if (openair0_num_detected_cards==1)
       p_exmimo_config->framing.multicard_syncmode=SYNCMODE_FREE;
     else if (card==0)
@@ -355,6 +354,7 @@ int openair0_config(openair0_config_t *openair0_cfg, int UE_flag)
 
     for (ant=0; ant<4; ant++) {
       if (openair0_cfg[card].rx_freq[ant] || openair0_cfg[card].tx_freq[ant]) {
+	ACTIVE_RF += (1<<ant)<<5;
         p_exmimo_config->rf.rf_mode[ant] = RF_MODE_BASE;
         p_exmimo_config->rf.do_autocal[ant] = 1;//openair0_cfg[card].autocal[ant];
 	printf("card %d, antenna %d, autocal %d\n",card,ant,openair0_cfg[card].autocal[ant]);
@@ -408,6 +408,15 @@ int openair0_config(openair0_config_t *openair0_cfg, int UE_flag)
       }
     }
 
+    if (openair0_cfg[card].duplex_mode==duplex_mode_FDD) {
+      p_exmimo_config->framing.tdd_config = DUPLEXMODE_FDD;
+      printf("!!!!!setting FDD (tdd_config=%d)\n",p_exmimo_config->framing.tdd_config);
+    } 
+    else {
+      p_exmimo_config->framing.tdd_config = DUPLEXMODE_TDD + TXRXSWITCH_LSB + ACTIVE_RF;
+      printf("!!!!!setting TDD (tdd_config=%d)\n",p_exmimo_config->framing.tdd_config);
+    }
+
     ret = ioctl(openair0_fd, openair_DUMP_CONFIG, card);
 
     if (ret!=0)

targets/RT/USER/lte-softmodem.c

@@ -970,6 +970,25 @@ void do_OFDM_mod_rt(int subframe,PHY_VARS_eNB *phy_vars_eNB)
 	 phy_vars_eNB->lte_eNB_common_vars.txdata[0][aa][tx_offset++] = 0x00010001;
        }
      }
+
+     if ((((phy_vars_eNB->lte_frame_parms.tdd_config==0) ||
+	  (phy_vars_eNB->lte_frame_parms.tdd_config==1) ||
+	  (phy_vars_eNB->lte_frame_parms.tdd_config==2) ||
+	  (phy_vars_eNB->lte_frame_parms.tdd_config==6)) && 
+	  (subframe==0)) || (subframe==5)) {
+       // turn on tx switch N_TA_offset before
+       //LOG_D(HW,"subframe %d, time to switch to tx (N_TA_offset %d, slot_offset %d) \n",subframe,phy_vars_eNB->N_TA_offset,slot_offset);
+       for (i=0; i<phy_vars_eNB->N_TA_offset; i++) {
+	 tx_offset = (int)slot_offset+time_offset[aa]+i-phy_vars_eNB->N_TA_offset/2;
+	 if (tx_offset<0)
+	   tx_offset += LTE_NUMBER_OF_SUBFRAMES_PER_FRAME*phy_vars_eNB->lte_frame_parms.samples_per_tti;
+	 
+	 if (tx_offset>=(LTE_NUMBER_OF_SUBFRAMES_PER_FRAME*phy_vars_eNB->lte_frame_parms.samples_per_tti))
+	   tx_offset -= LTE_NUMBER_OF_SUBFRAMES_PER_FRAME*phy_vars_eNB->lte_frame_parms.samples_per_tti;
+	 
+	 phy_vars_eNB->lte_eNB_common_vars.txdata[0][aa][tx_offset] = 0x00000000;
+       }
+     }
     }
   }
 }
@@ -2821,7 +2840,7 @@ int main( int argc, char **argv )
       }
 
 #else
-      //already taken care of in lte-softmodem
+      //already taken care of in lte-softmodem.c
       PHY_vars_eNB_g[0][CC_id]->N_TA_offset = 0;
 #endif
 
@@ -2901,7 +2920,12 @@ int main( int argc, char **argv )
       openair0_cfg[card].tx_delay = 8;
 #endif
     }
-    
+
+    if (frame_parms[0]->frame_type==TDD)
+      openair0_cfg[card].duplex_mode = duplex_mode_TDD;
+    else //FDD
+      openair0_cfg[card].duplex_mode = duplex_mode_FDD;
+
 #ifdef ETHERNET
 
     //calib needed
@@ -2935,7 +2959,7 @@ int main( int argc, char **argv )
       openair0_cfg[card].remote_ip   = &rrh_eNB_ip[0];
       openair0_cfg[card].remote_port = rrh_eNB_port;
     }
-openair0_cfg[card].num_rb_dl=frame_parms[0]->N_RB_DL;
+    openair0_cfg[card].num_rb_dl=frame_parms[0]->N_RB_DL;
 #endif
     openair0_cfg[card].sample_rate = sample_rate;
     openair0_cfg[card].tx_bw = bw;
@@ -3064,7 +3088,7 @@ openair0_cfg[card].num_rb_dl=frame_parms[0]->N_RB_DL;
 
   for(CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
     rf_map[CC_id].card=0;
-    rf_map[CC_id].chain=CC_id;
+    rf_map[CC_id].chain=CC_id+1;
   }
 
   // connect the TX/RX buffers