--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/g23m-gsm/dl/dl_dph.c	Fri Oct 16 06:25:50 2020 +0000
@@ -0,0 +1,671 @@
+/*
++-----------------------------------------------------------------------------
+|  Project :  GSM-PS
+|  Modul   :  DL_DPH
++-----------------------------------------------------------------------------
+|  Copyright 2002 Texas Instruments Berlin, AG
+|                 All rights reserved.
+|
+|                 This file is confidential and a trade secret of Texas
+|                 Instruments Berlin, AG
+|                 The receipt of or possession of this file does not convey
+|                 any rights to reproduce or disclose its contents or to
+|                 manufacture, use, or sell anything it may describe, in
+|                 whole, or in part, without the specific written consent of
+|                 Texas Instruments Berlin, AG.
++-----------------------------------------------------------------------------
+|  Purpose :  This Modul defines the functions for distributing
+|             all primitives of the lower layers.
++-----------------------------------------------------------------------------
+*/
+
+#ifndef DL_DPH_C
+#define DL_DPH_C
+
+#define ENTITY_DL
+
+/*==== INCLUDES ===================================================*/
+
+#include "typedefs.h"
+#include <string.h>
+#include "pconst.cdg"
+#include "vsi.h"
+#include "pconst.cdg"
+#include "custom.h"
+#include "gsm.h"
+#include "mon_dl.h"
+#include "prim.h"
+#include "pei.h"
+#include "tok.h"
+#include "ccdapi.h"
+#include "dl.h"
+#include "dl_trc.h"
+
+/*==== EXPORT =====================================================*/
+
+/*==== PRIVAT =====================================================*/
+#if defined(_SIMULATION_) && !defined(DL_2TO1)
+LOCAL void dph_ph_data_req (T_PH_DATA_REQ * data_req);
+#endif /* _SIMULATION_ && !DL_2TO1 */
+
+#if defined(DL_2TO1) || defined(USE_L1M_GS001_1)
+LOCAL U8 convert_dcch_ch_type (U8 channel_type);
+#endif  /* DL_2TO1 || USE_L1M_GS001_1 */
+
+LOCAL void dl_process_downlink (UBYTE error_flag, UBYTE channel_type,
+                                UBYTE * frame, ULONG fn);
+
+/*==== VARIABLES ==================================================*/
+
+/*==== FUNCTIONS ==================================================*/
+#if defined(DL_2TO1)
+#if defined(_SIMULATION_)
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DPH                     |
+| STATE   : code                ROUTINE : dph_ph_ready_to_send       |
++--------------------------------------------------------------------+
+
+  PURPOSE : Reception of a PH_READY_TO_SEND primitive.
+            Uplink opportunity for simulation.
+
+*/
+
+GLOBAL void l1test_call_mphc_read_dcch (T_L1TEST_CALL_MPHC_READ_DCCH * ready)
+{
+  UBYTE  no_signalling_flag = NO_SIGNALLING;
+  T_RADIO_FRAME *frame = NULL;
+
+  GET_INSTANCE_DATA;  
+  dl_data->dl_active = FALSE;
+
+  switch (ready->chn_mode)
+  {
+    case CM_SIGNALLING_ONLY:
+      /*
+      * Take over the behaviour of dll_read_dcch():
+      * No ch_type is given by the layer 1 for SDCCH and FACCH,
+      * the first parameter ch_type of the fuction dl1_uplink_ind() get a
+      * value set to zero.
+      */
+      no_signalling_flag = SIG_ONLY;
+      break;
+    default:
+      break;
+  }
+
+  frame = dl1_uplink_ind (0, no_signalling_flag);
+
+  if (frame)
+  {
+    l1test_return_mphc_read_dcch (frame);
+  }
+
+  MY_PFREE (ready);
+}
+
+GLOBAL void l1test_call_mphc_read_sacch (T_L1TEST_CALL_MPHC_READ_SACCH * ready)
+{
+  T_RADIO_FRAME *frame = NULL;
+
+  GET_INSTANCE_DATA;
+  dl_data->dl_active = FALSE;
+
+  frame = dl1_uplink_ind (L2_CHANNEL_SACCH, SIG_ONLY);
+  if (frame)
+  {
+    l1test_return_mphc_read_sacch (frame);
+  }
+
+  MY_PFREE (ready);
+}
+
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DPH                     |
+| STATE   : code                ROUTINE : dph_ph_data_req            |
++--------------------------------------------------------------------+
+
+  PURPOSE : Sending of a PH_DATA_REQ primitive.
+            Uplink for simulation.
+
+*/
+
+GLOBAL void l1test_return_mphc_read_dcch (T_RADIO_FRAME * frame)
+{
+  PALLOC(data_req, L1TEST_RETURN_MPHC_READ_DCCH);
+
+  TRACE_FUNCTION ("l1test_return_mphc_read_dcch()");
+
+  memcpy(data_req->l2_frame.frame_array, frame->frame_array, sizeof(data_req->l2_frame));
+  PSEND (hCommPL, data_req);
+}
+
+GLOBAL void l1test_return_mphc_read_sacch (T_RADIO_FRAME * frame)
+{
+  PALLOC(data_req, L1TEST_RETURN_MPHC_READ_SACCH);
+
+  TRACE_FUNCTION ("l1test_return_mphc_read_sacch()");
+
+  memcpy(data_req->l2_frame.frame_array, frame->frame_array, sizeof(data_req->l2_frame));
+  PSEND (hCommPL, data_req);
+}
+
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DPH                     |
+| STATE   : code                ROUTINE : l1test_call_mphc_dcch_downlink            |
++--------------------------------------------------------------------+
+
+  PURPOSE : Reception of a L1TEST_CALL_MPHC_DCCH_DOWNLINK primitive.
+
+*/
+
+GLOBAL void l1test_call_mphc_dcch_downlink (T_L1TEST_CALL_MPHC_DCCH_DOWNLINK * data_ind)
+{
+  /*
+  * Take over the behaviour of dll_dcch_downlink():
+  * No ch_type is given by the layer 1 for SDCCH and FACCH,
+  * the second parameter ch_type of the function dl_process_downlink() get a
+  * value set to zero.
+  */
+  dl_data->dl_active = FALSE;
+
+  dl_process_downlink (data_ind->valid_flag, 0, data_ind->l2_frame.frame_array, NOT_PRESENT_32BIT);
+
+  MY_PFREE (data_ind);
+}
+#endif  /* _SIMULATION_ */
+
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DPH                     |
+| STATE   : code                ROUTINE : dph_ph_data_ind            |
++--------------------------------------------------------------------+
+
+  PURPOSE : Reception of a PH_DATA_IND primitive.
+            This function is only available in stacks >= TCS5 (DL_2TO1).
+            A function with the same name exist for the old GSM/GPRS stack.
+
+            It is used for SACCH downlink on target as well as on simulation.
+            In opposite to the old GSM/GPRS stack, a functional interface
+            (l1test_call_mphc_dcch_downlink) is used by the dual mode stack
+            implementation for SDCCH and FACCH during simulation. Therefore
+            this function is only used for SACCH.
+
+*/
+
+GLOBAL void dph_ph_data_ind (T_MPHC_PH_DATA_IND * data_ind)
+{
+  /*
+  * Take over the behaviour of dll_dcch_downlink():
+  * No ch_type is given by the layer 1 for SDCCH and FACCH,
+  * the second parameter ch_type of the function dl_process_downlink() get a
+  * value set to zero.
+  */
+
+  TRACE_FUNCTION ("dph_ph_data_ind() 2TO1");
+
+  if (data_ind->l2_channel_type EQ L2_CHANNEL_SACCH)
+    dl_process_downlink (data_ind->error_cause,
+                         L2_CHANNEL_SACCH,
+                         data_ind->l2_frame.frame_array,
+                         NOT_PRESENT_32BIT);
+
+  MY_PFREE (data_ind);
+}
+
+#else /* DL_2TO1 */
+
+#if defined(_SIMULATION_)
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DPH                     |
+| STATE   : code                ROUTINE : dph_ph_ready_to_send       |
++--------------------------------------------------------------------+
+
+  PURPOSE : Reception of a PH_READY_TO_SEND primitive.
+            Uplink opportunity for simulation.
+
+*/
+
+GLOBAL void dph_ph_ready_to_send (T_PH_READY_TO_SEND * ready)
+{
+  UBYTE   no_signalling_flag = SIG_ONLY;
+  T_RADIO_FRAME *frame;
+  UBYTE   ch_type;
+  switch (ready->ch_type)
+  {
+    case L2_CHANNEL_FACCH_F:
+    case L2_CHANNEL_FACCH_H:
+      no_signalling_flag = NO_SIGNALLING;
+      /*lint -fallthrough */
+    case L2_CHANNEL_SDCCH:
+      /*
+      * Take over the behaviour of dll_read_dcch():
+      * No ch_type is given by the layer 1 for SDCCH and FACCH,
+      * the first parameter ch_type of the function dl1_uplink_ind() get a
+      * value set to zero.
+      */
+      ch_type = 0;
+      break;
+    default:
+      ch_type = ready->ch_type;
+      break;
+  }
+
+  frame = dl1_uplink_ind (ch_type, no_signalling_flag);
+  if (frame)
+  {
+    PALLOC_SDU (data, PH_DATA_REQ, 23*BITS_PER_BYTE);/* T_PH_DATA_REQ */
+
+    /*
+     * In case the value of ready->ch_type was set to zero above it has to set
+     * to the value of dcch0_ch_type corresponding the behaviour of the
+     * function dl1_uplink_ind().
+    if (ready->ch_type EQ 0)
+    {
+      T_DL_DATA *dl_data = dl_get_data ();
+      ready->ch_type = dl_data->dcch0_ch_type ? dl_data->dcch0_ch_type : L2_CHANNEL_SDCCH;
+    }
+    */
+
+    memcpy (data->sdu.buf, frame, 23);/*lint !e419 (Warning -- Apparent data overrun) */
+    if (ready->ch_type EQ L2_CHANNEL_SACCH)
+    {
+      data->sdu.buf[0] = 0;/* layer 1 header occupies 2 bytes */
+      data->sdu.buf[1] = 0;/*lint !e415 (Warning -- access of out-of-bounds pointer) */
+      data->sdu.o_buf = 2 * BITS_PER_BYTE;
+      data->sdu.l_buf = 21 * BITS_PER_BYTE;
+    }
+    else
+    {
+      data->sdu.o_buf = 0;
+      data->sdu.l_buf = 23 * BITS_PER_BYTE;
+    }
+    data->ch_type = ready->ch_type;
+    dph_ph_data_req (data);
+  }
+
+  MY_PFREE (ready);
+}
+
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DPH                     |
+| STATE   : code                ROUTINE : dph_ph_data_req            |
++--------------------------------------------------------------------+
+
+  PURPOSE : Sending of a PH_DATA_REQ primitive.
+            Uplink for simulation.
+
+*/
+
+LOCAL void dph_ph_data_req (T_PH_DATA_REQ * data_req)
+{
+  TRACE_FUNCTION ("dph_ph_data_req()");
+
+#if defined(DL_TRACE_WIN32)
+  if (data_req->ch_type EQ L2_CHANNEL_SACCH)
+  {
+    /*lint -e416 (Warning -- creation of out-of-bounds pointer) */
+    FTRC (data_req->ch_type, data_req->sdu.buf+2, 1); /* uplink SACCH */
+    /*lint +e416 (Warning -- creation of out-of-bounds pointer) */
+  }
+  else
+  {
+    FTRC (data_req->ch_type, data_req->sdu.buf, 1); /* uplink other */
+  }
+#endif  /* DL_TRACE_WIN32 */
+
+  PSENDX (PL, data_req);
+}
+#endif  /* _SIMULATION */
+
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DPH                     |
+| STATE   : code                ROUTINE : dph_ph_data_ind            |
++--------------------------------------------------------------------+
+
+  PURPOSE : Reception of a PH_DATA_IND primitive.
+            This function is only available in the old GSM/GPRS stack (<= TCS4).
+            A function with the same name exist for the dual mode stack.
+
+            It can be used for SACCH downlink on target as well as on simulation.
+            During simulation the old GSM/GPRS stack uses this primitive
+            function for SDCCH and FACCH also. In this case it takes over the
+            functional interface dll_dcch_downlink().
+            In the current implementation of the old GSM/GPRS stack the ALR
+            queue is exclusively used for incoming PH_DATA_IND primitives from
+            L1 for target builds. Only Acknowledged frames (SAPI=3) and frames
+            with Bter format (short PD header) are forwarded to DL and handled
+            by this function.
+
+*/
+
+GLOBAL void dph_ph_data_ind (T_PH_DATA_IND * ph_data_ind)
+{
+  if (ph_data_ind)
+  {
+    #if defined(_SIMULATION_)
+      /*
+      * Take over the behaviour of dll_dcch_downlink():
+      * No ch_type is given by the layer 1 for SDCCH and FACCH,
+      * the first parameter ch_type of the function dl_process_downlink() get a
+      * value set to zero.
+      */
+      switch (ph_data_ind->l2_channel_type)
+      {
+        case L2_CHANNEL_SDCCH:
+        case L2_CHANNEL_FACCH_F:
+        case L2_CHANNEL_FACCH_H:
+          ph_data_ind->l2_channel_type = 0;
+          break;
+        default:
+          break;
+      }
+    #else  /* _SIMULATION */
+      if (ph_data_ind->l2_channel_type EQ L2_CHANNEL_SACCH)
+    #endif  /* _SIMULATION */
+        dl_process_downlink (ph_data_ind->error_cause,
+                             ph_data_ind->l2_channel_type,
+                             ph_data_ind->l2_frame.A,
+                             NOT_PRESENT_32BIT);
+
+    MY_PFREE (ph_data_ind);
+  }
+}
+#endif /* DL_2TO1 */
+
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DPH                     |
+| STATE   : code                ROUTINE : dl_process_downlink        |
++--------------------------------------------------------------------+
+
+  PURPOSE : really processing of layer 2 frame downlink.
+
+*/
+LOCAL void dl_process_downlink (UBYTE error_flag, UBYTE channel_type, UBYTE * frame, ULONG fn)
+{
+  GET_INSTANCE_DATA; 
+
+  TRACE_FUNCTION ("dll_process_downlink()");
+
+  /* set the active dedicated channel type if necessary */
+  if (channel_type EQ 0)
+  {
+    TRACE_EVENT_WIN_P3 ("dl_process_downlink(%u,) -> ch=%u FN=%d", channel_type, dl_data->dcch0_ch_type, ((int)fn));
+    channel_type = dl_data->dcch0_ch_type  ? dl_data->dcch0_ch_type : L2_CHANNEL_SDCCH;
+  }
+  else
+  {
+    TRACE_EVENT_WIN_P1 ("dl_process_downlink(%u,)", channel_type);
+  }
+
+  if (channel_type NEQ L2_CHANNEL_SACCH)
+    dl_data->interrupt_context = TRUE;
+
+  if (fn NEQ NOT_PRESENT_32BIT)
+    dl_data->fn = fn;
+
+#if defined(DL_TRACE_ENABLED)
+  {
+    UCHAR trace_channel = TRACE_CH_UNKNOWN;
+    UCHAR frame_sapi;
+
+    switch (channel_type)
+    {
+    case L2_CHANNEL_SACCH:
+      frame_sapi = ((*(frame + 2)) & 0x1c) >> 2;
+      if (frame_sapi EQ PS_SAPI_0)
+        trace_channel = C_DCCH0;
+      else if (frame_sapi EQ PS_SAPI_3)
+        trace_channel = C_DCCH3;
+      break;
+    case L2_CHANNEL_SDCCH:
+      frame_sapi = ((*frame) & 0x1c) >> 2;
+      if (frame_sapi EQ PS_SAPI_0)
+        trace_channel = C_DCCH0;
+      else if (frame_sapi EQ PS_SAPI_3)
+        trace_channel = C_DCCH3;
+      break;
+    case L2_CHANNEL_FACCH_F:
+    case L2_CHANNEL_FACCH_H:
+      frame_sapi = ((*frame) & 0x1c) >> 2;
+      if (frame_sapi EQ PS_SAPI_0)
+        trace_channel = C_DCCH0;
+      break;
+    default:
+      break;
+    }/* endswitch chan */
+    if (error_flag EQ VALID_BLOCK)
+    {
+      DL_OFFLINE_TRACE (TRACE_DOWNLINK, trace_channel, channel_type, &frame[0]);
+    }
+  }
+#endif /* DL_TRACE_ENABLED */
+
+#if defined(DL_TRACE_WIN32)
+  if (error_flag EQ VALID_BLOCK)
+  {
+    if (channel_type EQ L2_CHANNEL_SACCH)
+      FTRC (channel_type, frame+2, 0); /* downlink SACCH */
+    else
+      FTRC (channel_type, frame, 0); /* downlink other */
+  }
+#endif /* DL_TRACE_WIN32 */
+
+  if (channel_type EQ 0)
+  {
+    DL_OFFLINE_TRACE (TRACE_DL_EVENT, TRACE_CH_UNKNOWN, channel_type, "DL:no valid channel type");
+  }
+  else
+  {
+    dl_downlink (error_flag, channel_type, &frame[0], fn);
+  }
+
+  dl_data->interrupt_context = FALSE;
+}
+
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DPH                     |
+| STATE   : code                ROUTINE : dl1_uplink_ind             |
++--------------------------------------------------------------------+
+
+  PURPOSE : Functional Interface for the uplink direction of the
+            logical channels SACCH/SDCCH/FACCH.
+            (only used by the target)
+
+*/
+GLOBAL T_RADIO_FRAME * dl1_uplink_ind (UBYTE channel_type, UBYTE no_signalling_flag)
+{
+  T_RADIO_FRAME * pRadioFrame;
+  UCHAR   channel;
+  UCHAR   sapi;
+  UCHAR   signalling = SIG_ONLY;
+
+  GET_INSTANCE_DATA; 
+
+  dl_data->interrupt_context = TRUE;
+
+  /* set the active dedicated channel type if necessary */
+  if (channel_type EQ 0)
+    channel_type = dl_data->dcch0_ch_type;
+
+  TRACE_EVENT_WIN_P1 ("dl1_uplink_ind(ch_type=%u,)", channel_type);
+
+  switch (channel_type)
+  {
+    case L2_CHANNEL_SACCH:
+      /*
+       * The priority arrangement on the SACCH must ensure that if a SAPI = 3
+       * frame is awaiting transmission, two SAPI = 0 frames are not sent in
+       * consecutive SACCH frames. In addition, for the mobile to network
+       * direction it must also be ensured that any SAPI = 3 frame is followed
+       * by at least one SAPI = 0 frame.
+       *
+       * SAPI = 3 is set as default value. The function dl_uplink() together with
+       * the variable 'sacch_last_uplink_sapi' determind the actual value.
+       * e.g. if last uplinked SACCH frame was one with SAPI=3
+       *       or
+       *      if no SACCH SAPI=3 frame is awaiting transmission
+       *      then a SACCH SAPI=0 frame should be uplinked
+       */
+      channel = C_SACCH0;
+      sapi = PS_SAPI_3;
+      TRACE_EVENT_WIN_P2 ("dl1_uplink_ind(%s, %s)",
+        CH_TYPE_NAME[channel_type], signalling EQ SIG_ONLY?"SIG_ONLY":"NO_SIGNALLING");
+      break;
+
+    default:
+      TRACE_ERROR ("dl1_uplink_ind():no valid channel type, use SDCCH instead");
+      channel_type = L2_CHANNEL_SDCCH;
+      /*lint -fallthrough*/
+    case L2_CHANNEL_FACCH_F:
+    case L2_CHANNEL_FACCH_H:
+    case L2_CHANNEL_SDCCH:
+      /*
+       * build frame for SAPI = 3 will be called (with lower priority)
+       * if no data is waiting for SAPI = 0.
+       */
+      channel = C_DCCH0;
+      sapi = PS_SAPI_0;
+      dl_data->cch[channel].ch_type = channel_type;
+      signalling = no_signalling_flag;
+      TRACE_EVENT_WIN_P3 ("dl1_uplink_ind(%s, %s) SAPI=%u",
+        CH_TYPE_NAME[channel_type], signalling EQ SIG_ONLY?"SIG_ONLY":"NO_SIGNALLING",
+        sapi);
+      break;
+  }
+
+  pRadioFrame= dl_uplink (channel, sapi, signalling, FALSE);
+  if (pRadioFrame)
+  {
+#ifndef DL_2TO1
+    DL_OFFLINE_TRACE (TRACE_UPLINK, channel, channel_type, &pRadioFrame->A[0]);
+#else
+    DL_OFFLINE_TRACE (TRACE_UPLINK, channel, channel_type, &pRadioFrame->frame_array[0]);
+#endif
+  }
+
+  dl_data->interrupt_context = FALSE;
+  return pRadioFrame;  /* return pointer to frame to layer 1 */
+}
+
+#if defined(DL_2TO1) || defined(USE_L1M_GS001_1)
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DPH                     |
+| STATE   : code                ROUTINE : convert_dcch_ch_type       |
++--------------------------------------------------------------------+
+
+  PURPOSE : Converts dedicated channel types to layer 2 channel types
+            according to L1M_GS001_1 and L1M_GS001_3.
+
+*/
+LOCAL U8 convert_dcch_ch_type (U8 channel_type)
+{
+  UBYTE ch_type;
+  switch (channel_type)
+  {
+    case MPHC_CH_TCH_F:  ch_type = L2_CHANNEL_FACCH_F;break;
+    case MPHC_CH_TCH_H:  ch_type = L2_CHANNEL_FACCH_H;break;
+    case MPHC_CH_SDCCH_4:
+    case MPHC_CH_SDCCH_8:ch_type = L2_CHANNEL_SDCCH;break;
+  }
+  return ch_type;
+}
+#endif  /* DL_2TO1 || USE_L1M_GS001_1 */
+
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DPH                     |
+| STATE   : code                ROUTINE : dll_read_dcch              |
++--------------------------------------------------------------------+
+
+  PURPOSE : Functional Interface for the uplink direction of
+            SDCCH/FACCH. Only used by the TI target, look into
+            TI interface S922 or L1M_GS001_1.
+
+*/
+#if defined(DL_2TO1) || defined(USE_L1M_GS001_1)
+GLOBAL T_RADIO_FRAME * dll_read_dcch (U8 chn_mode, U8 channel_type)
+{
+  return dl1_uplink_ind(convert_dcch_ch_type(channel_type), chn_mode);
+}
+#else  /* DL_2TO1 || USE_L1M_GS001_1 */
+GLOBAL T_RADIO_FRAME * dll_read_dcch (U8 chn_mode)
+{
+  /* 0 stands for the currently active SDCCH and FACCH channel type */
+  return dl1_uplink_ind(0, chn_mode);
+}
+#endif  /* DL_2TO1 || USE_L1M_GS001_1 */
+
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DPH                     |
+| STATE   : code                ROUTINE : dll_read_sacch             |
++--------------------------------------------------------------------+
+
+  PURPOSE : Functional Interface for the uplink direction of SACCH.
+            Only used by the TI target, look into
+            TI interface S922 or L1M_GS001_1.
+
+*/
+GLOBAL T_RADIO_FRAME * dll_read_sacch (UBYTE chn_mode)
+{
+  return dl1_uplink_ind (L2_CHANNEL_SACCH, SIG_ONLY);
+}
+
+/*
++--------------------------------------------------------------------+
+| PROJECT : GSM-PS (6147)       MODULE  : DL_DPH                     |
+| STATE   : code                ROUTINE : dll_dcch_downlink          |
++--------------------------------------------------------------------+
+
+  PURPOSE : Functional Interface for the downlink direction of
+            FACCH/DCCH. Only used by the TI target, look into
+            TI interface S922 or L1M_GS001_1.
+
+*/
+#if defined(DL_2TO1) || defined(USE_L1M_GS001_1)
+GLOBAL void dll_dcch_downlink(U32 * data_ptr, U8 valid_flag, U8 channel_type, U32 fn)
+{
+  if ((data_ptr NEQ NULL) AND (valid_flag EQ DATA_VALID))
+  {
+    dl_process_downlink (VALID_BLOCK, convert_dcch_ch_type(channel_type),
+                         (UBYTE *)data_ptr, fn);
+  }
+}
+#else  /* DL_2TO1 || USE_L1M_GS001_1 */
+#if defined(SEND_FN_TO_L2_IN_DCCH) && (SEND_FN_TO_L2_IN_DCCH == 1)
+  GLOBAL void dll_dcch_downlink(U32 * data_ptr, U8 valid_flag, U32 fn)
+  {
+    if ((data_ptr NEQ NULL) AND valid_flag)
+    {
+      /*
+       * channel type 0 stands for currently active dedicated
+       * SDCCH or FACCH channel type
+       */
+      dl_process_downlink (VALID_BLOCK, 0, (UBYTE *)data_ptr, fn);
+    }
+  }
+#else /* SEND_FN_TO_L2_IN_DCCH == 1 */
+  GLOBAL void dll_dcch_downlink(U32 * data_ptr, U8 valid_flag)
+  {
+    if ((data_ptr NEQ NULL) AND valid_flag)
+    {
+      /*
+       * channel type 0 stands for currently active dedicated
+       * SDCCH or FACCH channel type
+       */
+      dl_process_downlink (VALID_BLOCK, 0, (UBYTE *)data_ptr, NOT_PRESENT_32BIT);
+    }
+  }
+#endif /* SEND_FN_TO_L2_IN_DCCH == 1 */
+#endif  /* DL_2TO1 || USE_L1M_GS001_1 */
+#endif /* DL_DPH_C */
+