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view src/cs/services/audio/audio_vm.c @ 220:0ed36de51973

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ABB semaphore protection overhaul The ABB semaphone protection logic that came with TCS211 from TI was broken in several ways: * Some semaphore-protected functions were called from Application_Initialize() context. NU_Obtain_Semaphore() called with NU_SUSPEND fails with NU_INVALID_SUSPEND in this context, but the return value wasn't checked, and NU_Release_Semaphore() would be called unconditionally at the end. The latter call would increment the semaphore count past 1, making the semaphore no longer binary and thus no longer effective for resource protection. The fix is to check the return value from NU_Obtain_Semaphore() and skip the NU_Release_Semaphore() call if the semaphore wasn't properly obtained. * Some SPI hardware manipulation was being done before entering the semaphore- protected critical section. The fix is to reorder the code: first obtain the semaphore, then do everything else. * In the corner case of L1/DSP recovery, l1_abb_power_on() would call some non-semaphore-protected ABB & SPI init functions. The fix is to skip those calls in the case of recovery. * A few additional corner cases existed, all of which are fixed by making ABB semaphore protection 100% consistent for all ABB functions and code paths. There is still one remaining problem of priority inversion: suppose a low- priority task calls an ABB function, and some medium-priority task just happens to preempt right in the middle of that semaphore-protected ABB operation. Then the high-priority SPI task is locked out for a non-deterministic time until that medium-priority task finishes its work and goes back to sleep. This priority inversion problem remains outstanding for now.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 26 Apr 2021 20:55:25 +0000
parents 4e78acac3d88
children
line wrap: on
line source

/****************************************************************************/
/*                                                                          */
/*  File Name:  audio_vm.c			                                        */
/*                                                                          */
/*  Purpose:  This file contains all the functions used to manage the       */
/*            Voice Memorization .                                          */
/*                                                                          */
/*  Version   0.1                                                           */
/*                                                                          */
/*  Date        Modification                                                */
/*  ------------------------------------                                    */
/*  2 August 2001 Create                                                    */
/*                                                                          */
/*  Author                                                                  */
/*     Stephanie Gerthoux                                                   */
/*                                                                          */
/* (C) Copyright 2001 by Texas Instruments Incorporated, All Rights Reserved*/
/****************************************************************************/

#include "rv/rv_defined_swe.h"
#ifdef RVM_AUDIO_MAIN_SWE
  #ifndef _WINDOWS
    #include "config/swconfig.cfg"
    #include "config/sys.cfg"
    #include "config/chipset.cfg"
  #endif

  /* include the usefull L1 header */
  #include "l1_confg.h"

  #if (VOICE_MEMO)
  #include "rv/rv_general.h"
  #include "rvm/rvm_gen.h"
  #include "audio/audio_ffs_i.h"
  #include "audio/audio_api.h"
  #include "audio/audio_structs_i.h"
  #include "audio/audio_var_i.h"
  #include "audio/audio_messages_i.h"
  #include "rvf/rvf_target.h"
  #include "audio/audio_const_i.h"
  #include "audio/audio_error_hdlr_i.h"

  /* include the usefull L1 header */
  #define BOOL_FLAG
  #define CHAR_FLAG
  #include "l1_types.h"
  #include "l1audio_cust.h"
  #include "l1audio_msgty.h"
  #include "l1audio_signa.h"

  /********************************************************************************/
  /*                                                                              */
  /*    Function Name:   audio_voice_memo_message_switch	                      */
  /*                                                                              */
  /*    Purpose:  Manage the message supply between the vice memo play and the    */
  /*              voice memo record                                               */
  /*                                                                              */
  /*    Input Parameters:                                                         */
  /*        start or stop message from the voice memo features                    */
  /*                                                                              */
  /*    Output Parameters:                                                        */
  /*        index of the manager                                                  */
  /*                                                                              */
  /*    Note:                                                                     */
  /*        None.                                                                 */
  /*                                                                              */
  /*    Revision History:                                                         */
  /*        None.                                                                 */
  /*                                                                              */
  /********************************************************************************/
  UINT8 audio_voice_memo_message_switch (T_RV_HDR *p_message)
  {
    switch (p_message->msg_id)
    {
      case AUDIO_FFS_INIT_DONE:
      {
        /* The FFS message is from the voice memo play */
        if ( ((T_AUDIO_FFS_INIT *)p_message)->session_id == AUDIO_FFS_SESSION_VM_PLAY )
        {
          return(AUDIO_VM_PLAY);
        }
        /* The FFS message is from the voice memo record */
        if ( ((T_AUDIO_FFS_INIT *)p_message)->session_id == AUDIO_FFS_SESSION_VM_RECORD )
        {
          return(AUDIO_VM_RECORD);
        }
        return(AUDIO_VM_NONE);
      }
      case AUDIO_FFS_STOP_CON:
      {
        /* The FFS message is from the voice memo play*/
        if ( ((T_AUDIO_FFS_STOP_REQ *)p_message)->session_id == AUDIO_FFS_SESSION_VM_PLAY )
        {
          return(AUDIO_VM_PLAY);
        }
        /* The FFS message is from the voice memo record */
        if ( ((T_AUDIO_FFS_STOP_REQ *)p_message)->session_id == AUDIO_FFS_SESSION_VM_RECORD )
        {
          return(AUDIO_VM_RECORD);
        }
        return(AUDIO_VM_NONE);
      }
      case AUDIO_VM_PLAY_START_REQ:
      case AUDIO_VM_PLAY_STOP_REQ:
      case MMI_VM_PLAY_START_CON:
      case MMI_VM_PLAY_STOP_CON:
      {
        return(AUDIO_VM_PLAY);
      }
      case AUDIO_VM_RECORD_START_REQ:
      case AUDIO_VM_RECORD_STOP_REQ:
      case MMI_VM_RECORD_START_CON:
      case MMI_VM_RECORD_STOP_CON:
      {
        return(AUDIO_VM_RECORD);
      }
      default:
      {
        return(AUDIO_VM_NONE);
        break;
      }

    } /* switch */
  }

  #endif /* VOICE_MEMO */
#endif /* RVM_AUDIO_MAIN_SWE */