FreeCalypso > hg > fc-tourmaline

diff src/cs/layer1/cfile/l1_cmplx.c @ 300:edcb8364d45b

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L1: resurrect TCH tap feature In this new incarnation of our TCH tap feature, we support DL sniffing in all 3 of FR1, HR1 and EFR, and the new implementation will capture every 20 ms frame where the old one silently skipped a frame (sent nothing) during FACCH stealing. The wire interface on RVTMUX changed slightly, and fc-shell tch record will need to be updated to support the new version. TCH UL play or substitution is supported for FR1 and EFR only; support for HR1 can be added later if needed.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 13 Dec 2022 02:44:01 +0000
parents 4e78acac3d88
children
line wrap: on
line diff
--- a/src/cs/layer1/cfile/l1_cmplx.c	Tue Mar 29 04:41:25 2022 +0000
+++ b/src/cs/layer1/cfile/l1_cmplx.c	Tue Dec 13 02:44:01 2022 +0000
@@ -233,6 +233,11 @@
   UWORD8 input_level_flag, UWORD8 input_level, UWORD16 radio_freq, UWORD8 if_threshold);
 #endif
 
+/* FreeCalypso added feature: TCH tap */
+extern BOOL tch_dl_sniff_mode, tch_ul_play_mode;
+extern void tch_send_downlink_bits(API *dsp_buffer, UWORD8 nwords,
+				   UWORD8 chan_mode, UWORD8 fn_mod_104);
+extern void tchf_substitute_uplink(API *dsp_buffer);
 
 //#pragma DUPLICATE_FOR_INTERNAL_RAM_END
 
@@ -5115,6 +5120,11 @@
           }
           #endif
         }
+        else if (tch_ul_play_mode &&
+                 (channel_mode == TCH_FS_MODE || channel_mode == TCH_EFR_MODE))
+        {
+          tchf_substitute_uplink(l1s_dsp_com.dsp_ndb_ptr->a_du_1);
+        }
       }
     }
 
@@ -8659,6 +8669,15 @@
              (channel_mode  == TCH_HS_MODE))
             play_trace();
         #endif
+        if (tch_dl_sniff_mode && channel_mode == TCH_HS_MODE)
+        {
+          if (subchannel == 0)
+            tch_send_downlink_bits(l1s_dsp_com.dsp_ndb_ptr->a_dd_0, 11,
+                                   channel_mode, fn_mod_104);
+          else if (subchannel == 1)
+            tch_send_downlink_bits(l1s_dsp_com.dsp_ndb_ptr->a_dd_1, 11,
+                                   channel_mode, fn_mod_104);
+        }
 
         // Check A_DD_0 information block only if no FACCH.
         if (subchannel==0)
@@ -9265,6 +9284,12 @@
               || channel_mode == TCH_EFR_MODE))
             play_trace();
         #endif
+        if (tch_dl_sniff_mode &&
+            (channel_mode == TCH_FS_MODE || channel_mode == TCH_EFR_MODE))
+        {
+            tch_send_downlink_bits(l1s_dsp_com.dsp_ndb_ptr->a_dd_0, 20,
+                                   channel_mode, fn_mod_104);
+        }
 
         // FACCH: Check A_FD information block.
         //-------------------------------------