From 591f583edbb3c1543eb51599a52b4f66b55210e7 Mon Sep 17 00:00:00 2001
From: ismagom <gomezi@tcd.ie>
Date: Mon, 16 Nov 2015 00:31:46 +0100
Subject: [PATCH] Option for ue_sync period

---
 srslte/include/srslte/ue/ue_sync.h | 4 ++++
 srslte/lib/ue/src/ue_sync.c        | 9 ++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/srslte/include/srslte/ue/ue_sync.h b/srslte/include/srslte/ue/ue_sync.h
index e702e4bfb..4eea06d8e 100644
--- a/srslte/include/srslte/ue/ue_sync.h
+++ b/srslte/include/srslte/ue/ue_sync.h
@@ -72,6 +72,7 @@ typedef struct SRSLTE_API {
   
   srslte_agc_t agc; 
   bool do_agc; 
+  uint32_t agc_period; 
   
   void *stream; 
   int (*recv_callback)(void*, void*, uint32_t, srslte_timestamp_t*); 
@@ -136,6 +137,9 @@ SRSLTE_API uint32_t srslte_ue_sync_sf_len(srslte_ue_sync_t *q);
 SRSLTE_API int srslte_ue_sync_get_buffer(srslte_ue_sync_t *q, 
                                          cf_t **sf_symbols);
 
+SRSLTE_API void srslte_ue_sync_set_agc_period(srslte_ue_sync_t *q, 
+                                              uint32_t period); 
+
 /* CAUTION: input_buffer MUST have space for 2 subframes */
 SRSLTE_API int srslte_ue_sync_zerocopy(srslte_ue_sync_t *q, 
                                        cf_t *input_buffer);
diff --git a/srslte/lib/ue/src/ue_sync.c b/srslte/lib/ue/src/ue_sync.c
index 14406ddd7..c3c13ec7a 100644
--- a/srslte/lib/ue/src/ue_sync.c
+++ b/srslte/lib/ue/src/ue_sync.c
@@ -122,6 +122,7 @@ int srslte_ue_sync_init(srslte_ue_sync_t *q,
     q->sf_len = SRSLTE_SF_LEN(q->fft_size);
     q->file_mode = false; 
     q->correct_cfo = true; 
+    q->agc_period = 0; 
     
     if (cell.id == 1000) {
       
@@ -268,6 +269,10 @@ void srslte_ue_sync_set_N_id_2(srslte_ue_sync_t *q, uint32_t N_id_2) {
   }
 }
 
+void srslte_ue_sync_set_agc_period(srslte_ue_sync_t *q, uint32_t period) {
+  q->agc_period = period; 
+}
+
 static int find_peak_ok(srslte_ue_sync_t *q, cf_t *input_buffer) {
 
   
@@ -452,7 +457,9 @@ int srslte_ue_sync_zerocopy(srslte_ue_sync_t *q, cf_t *input_buffer) {
           /* Every SF idx 0 and 5, find peak around known position q->peak_idx */
           if (q->sf_idx == 0 || q->sf_idx == 5) {
 
-            if (q->do_agc) {
+            if (q->do_agc && (q->agc_period == 0 || 
+                             (q->agc_period && (q->frame_total_cnt%q->agc_period) == 0))) 
+            {
               srslte_agc_process(&q->agc, input_buffer, q->sf_len);        
             }