--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cs/services/tty/tty_api.c	Fri Oct 16 06:23:26 2020 +0000
@@ -0,0 +1,147 @@
+/**
+ * @file	tut_api.c
+ *
+ * API for TTY SWE.
+ *
+ * @author	Frederic Turgis (f-turgis@ti.com) & Gerard Cauvy (g-cauvy@ti.com)
+ * @version 0.1
+ */
+
+/*
+ * History:
+ *
+ * 	Date       	Modification
+ *  ------------------------------------
+ *  01/27/2003	Create
+ *
+ * (C) Copyright 2003 by Texas Instruments Incorporated, All Rights Reserved
+ */
+
+#ifndef _WINDOWS
+  #include "config/l1sw.cfg"
+#endif
+
+#include "tty/tty_i.h"
+
+#include "tty/tty_api.h"
+#include "audio/audio_structs_i.h"
+#include "audio/audio_const_i.h"
+
+/* External declaration */
+extern T_AUDIO_ENV_CTRL_BLK* p_audio_gbl_var;
+
+/********************************************************************************/
+/*                                                                              */
+/*    Function Name:   audio_tty_set_config                                     */
+/*                                                                              */
+/*    Purpose:  This function is called to configure TTY. Currently, only       */
+/*              supports start and stop                                         */
+/*                                                                              */
+/*    Input Parameters:                                                         */
+/*        TTY configuration                                                     */
+/*        Return path.                                                          */
+/*                                                                              */
+/*    Output Parameters:                                                        */
+/*         Validation of the parameters.                                        */
+/*                                                                              */
+/*    Note:                                                                     */
+/*        None.                                                                 */
+/*                                                                              */
+/*    Revision History:                                                         */
+/*        None.                                                                 */
+/*                                                                              */
+/********************************************************************************/
+T_AUDIO_RET audio_tty_set_config (T_AUDIO_TTY_CONFIG_PARAMETER *parameter, T_RV_RETURN *return_path)
+{
+  #if (L1_GTT == 1)
+    /* Declare local variables. */
+    T_RVF_MB_STATUS   mb_status = RVF_GREEN;
+    T_RV_HDR *p_msg = NULL;
+
+    /************************ audio_tty_set_config function begins ******************/
+    if (p_audio_gbl_var == NULL )
+    {
+      TTY_SEND_TRACE("TTY: Error Audio SWE not started ",RV_TRACE_LEVEL_ERROR);
+      return(AUDIO_ERROR);
+    }
+
+    /* If bad parameters, then report an error and abort.*/
+    if ( (parameter->Mode != TTY_STOP)&&
+         (parameter->Mode != TTY_EXT_START))
+    {
+      TTY_SEND_TRACE("TTY: Error bad parameters ",RV_TRACE_LEVEL_ERROR);
+      return (AUDIO_ERROR);
+    }
+
+    switch (parameter->Mode)
+    {
+      case TTY_EXT_START:
+      {
+        /* allocate the memory for the message to send */
+        mb_status = rvf_get_buf (p_audio_gbl_var->mb_external,
+                                 sizeof (T_TTY_START),
+                                 (T_RVF_BUFFER **) (&p_msg));
+      }
+      break;
+      case TTY_STOP:
+      {
+        /* allocate the memory for the message to send */
+        mb_status = rvf_get_buf (p_audio_gbl_var->mb_external,
+                                 sizeof (T_TTY_STOP),
+                                 (T_RVF_BUFFER **) (&p_msg));
+      }
+      break;
+    }
+
+    /* If insufficient resources, then report a memory error and abort. */
+    if (mb_status == RVF_YELLOW)
+    {
+      /* deallocate the memory */
+      rvf_free_buf((T_RVF_BUFFER *)p_msg);
+      TTY_SEND_TRACE("TTY: Not Enough Memory (Yellow!) ",RV_TRACE_LEVEL_ERROR);
+      return (AUDIO_ERROR);
+    }
+    else
+    if (mb_status == RVF_RED)
+    {
+      TTY_SEND_TRACE("TTY: Not Enough Memory (Red!) ",RV_TRACE_LEVEL_ERROR);
+      return (AUDIO_ERROR);
+    }
+
+    /* fill the message id + parameters */
+    switch (parameter->Mode)
+    {
+      case TTY_EXT_START:
+        p_msg->msg_id = TTY_START_REQ;
+
+        if (return_path->callback_func == NULL)
+        {
+          ((T_TTY_START *)p_msg)->return_path.addr_id = return_path->addr_id;
+          ((T_TTY_START *)p_msg)->return_path.callback_func = NULL;
+        }
+        else
+        {
+          ((T_TTY_START *)p_msg)->return_path.callback_func = return_path->callback_func;
+        }
+      break;
+      case TTY_STOP:
+        p_msg->msg_id = TTY_STOP_REQ;
+      break;
+    }
+
+    /* fill the address source id */
+    p_msg->src_addr_id = rvf_get_taskid();
+    p_msg->dest_addr_id = p_audio_gbl_var->addrId;
+
+    /* send the messsage to the audio entity */
+    rvf_send_msg (p_audio_gbl_var->addrId, p_msg);
+
+    return (AUDIO_OK);
+
+  #else // L1_GTT
+
+    TTY_SEND_TRACE("TTY API not available ", RV_TRACE_LEVEL_ERROR);
+    return (AUDIO_ERROR);
+
+  #endif
+}