Simplified ue_mib API

lte/examples/cell_search_utils.c

@@ -75,7 +75,7 @@ int decode_pbch(void *uhd, ue_celldetect_result_t *found_cell, uint32_t nof_fram
     
     DEBUG("Calling ue_mib_decode() %d/%d\n", nof_frames, nof_frames_total);
     
-    n = ue_mib_decode(&uemib, buffer, flen, bch_payload, nof_tx_ports, sfn_offset);
+    n = ue_mib_decode(&uemib, buffer, flen);
     if (n == LIBLTE_ERROR || n == LIBLTE_ERROR_INVALID_INPUTS) {
       fprintf(stderr, "Error calling ue_mib_decode()\n");
       goto free_and_exit;
@@ -93,6 +93,7 @@ int decode_pbch(void *uhd, ue_celldetect_result_t *found_cell, uint32_t nof_fram
   
   if (n == MIB_FOUND) {
     printf("\n\nMIB decoded in %d ms (%d half frames)\n", nof_frames*5, nof_frames);
+    ue_mib_get_payload(&uemib, bch_payload, nof_tx_ports, sfn_offset);
     ret = LIBLTE_SUCCESS;
   } else {
     ret = LIBLTE_ERROR;

lte/phy/include/liblte/phy/ue/ue_mib.h

@@ -75,6 +75,10 @@ typedef struct LIBLTE_API {
   chest_t chest; 
   pbch_t pbch;
   
+  uint8_t bch_payload[BCH_PAYLOAD_LEN];
+  uint32_t nof_tx_ports; 
+  uint32_t sfn_offset; 
+  
   uint32_t frame_cnt; 
   uint32_t last_frame_trial; 
 } ue_mib_t;
@@ -90,7 +94,9 @@ LIBLTE_API void ue_mib_reset(ue_mib_t *q);
 
 LIBLTE_API int ue_mib_decode(ue_mib_t *q,
                              cf_t *signal, 
-                             uint32_t nsamples,
+                             uint32_t nsamples);
+
+LIBLTE_API void ue_mib_get_payload(ue_mib_t *q,
                                    uint8_t bch_payload[BCH_PAYLOAD_LEN], 
                                    uint32_t *nof_tx_ports,
                                    uint32_t *sfn_offset);

lte/phy/lib/ue/src/ue_mib.c

@@ -139,8 +139,7 @@ void ue_mib_set_threshold(ue_mib_t * q, float threshold)
   sync_set_threshold(&q->sfind, threshold);
 }
 
-static int mib_decoder_run(ue_mib_t * q, cf_t *input, 
-                           uint8_t bch_payload[BCH_PAYLOAD_LEN], uint32_t *nof_tx_ports, uint32_t *sfn_offset)
+static int mib_decoder_run(ue_mib_t * q, cf_t *input)
 {
   int ret = LIBLTE_SUCCESS;
 
@@ -163,7 +162,7 @@ static int mib_decoder_run(ue_mib_t * q, cf_t *input,
   }
   
   /* Decode PBCH */
-  ret = pbch_decode(&q->pbch, q->slot1_symbols, q->ce, bch_payload, nof_tx_ports, sfn_offset);
+  ret = pbch_decode(&q->pbch, q->slot1_symbols, q->ce, q->bch_payload, &q->nof_tx_ports, &q->sfn_offset);
   if (ret < 0) {
     fprintf(stderr, "Error decoding PBCH\n");      
   } else if (ret == 1) {
@@ -179,12 +178,23 @@ static int mib_decoder_run(ue_mib_t * q, cf_t *input,
 }
 int counter1=0,counter2=0,counter3=0,counter4=0;
 
-int ue_mib_decode(ue_mib_t * q, 
-                  cf_t *signal, 
-                  uint32_t nsamples,
+void ue_mib_get_payload(ue_mib_t *q,
                         uint8_t bch_payload[BCH_PAYLOAD_LEN], 
                         uint32_t *nof_tx_ports,
                         uint32_t *sfn_offset) 
+{
+  memcpy(bch_payload, q->bch_payload, sizeof(uint8_t) * BCH_PAYLOAD_LEN);
+  if (nof_tx_ports) {
+    *nof_tx_ports = q->nof_tx_ports;    
+  }
+  if (sfn_offset) {
+    *sfn_offset = q->sfn_offset;
+  }
+}
+
+int ue_mib_decode(ue_mib_t * q, 
+                  cf_t *signal, 
+                  uint32_t nsamples)
 {
   int ret = LIBLTE_ERROR_INVALID_INPUTS;
   uint32_t peak_idx=0;
@@ -229,7 +239,7 @@ int ue_mib_decode(ue_mib_t * q,
           sync_get_sf_idx(&q->sfind)             == 0) 
       {
         INFO("Trying to decode MIB\n",0);
-        ret = mib_decoder_run(q, &signal[nf*MIB_FRAME_SIZE+peak_idx], bch_payload, nof_tx_ports, sfn_offset);
+        ret = mib_decoder_run(q, &signal[nf*MIB_FRAME_SIZE+peak_idx]);
         counter3++;
       } else if ((ret == LIBLTE_SUCCESS && peak_idx != 0)   || 
                  (ret == 1              && nf*MIB_FRAME_SIZE + peak_idx + 960 > nsamples))