pucch: added function to get last correlation

srslte/include/srslte/phch/pucch.h

@@ -101,6 +101,7 @@ typedef struct SRSLTE_API {
 
   float threshold_format1;
   float threshold_format1a;
+  float last_corr;
   
 }srslte_pucch_t;
 
@@ -125,6 +126,8 @@ SRSLTE_API uint32_t srslte_pucch_nof_symbols(srslte_pucch_cfg_t *cfg,
                                              srslte_pucch_format_t format, 
                                              bool shortened); 
 
+SRSLTE_API float srslte_pucch_get_last_corr(srslte_pucch_t* q); 
+
 SRSLTE_API int srslte_pucch_encode(srslte_pucch_t *q, 
                                    srslte_pucch_format_t format,
                                    uint32_t n_pucch, // n_pucch_1 or n_pucch_2 depending on format

srslte/lib/phch/pucch.c

@@ -671,6 +671,10 @@ int srslte_pucch_encode(srslte_pucch_t* q, srslte_pucch_format_t format,
   return ret;     
 }
 
+float srslte_pucch_get_last_corr(srslte_pucch_t* q) 
+{
+  return q->last_corr; 
+}
   
 /* Equalize, demodulate and decode PUCCH bits according to Section 5.4.1 of 36.211 */
 int srslte_pucch_decode(srslte_pucch_t* q, srslte_pucch_format_t format, 
@@ -752,6 +756,7 @@ int srslte_pucch_decode(srslte_pucch_t* q, srslte_pucch_format_t format,
         ret = SRSLTE_ERROR; 
         break;
     }
+    q->last_corr = corr; 
   }
 
   return ret;