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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
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/****************************************************************************/
/*                                                                          */
/*  File Name:  audio_bgd_const_i.h                                         */
/*                                                                          */
/*  Purpose:  Internal constants used by AUDIO BACKGROUND instance          */
/*                                                                          */
/*                                                                          */
/*  Version   1                                                             */
/*                                                                          */
/*  Date          Modification                                              */
/*  ------------------------------------                                    */
/*  19 June 2003  Creation                                                  */
/*                                                                          */
/*  Author      Frederic Turgis                                             */
/*                                                                          */
/*                                                                          */
/* (C) Copyright 2001 by Texas Instruments Incorporated, All Rights Reserved*/
/****************************************************************************/

#include "rv/rv_defined_swe.h"

#ifdef RVM_AUDIO_BGD_SWE

  #ifndef __AUDIO_CONST_I_H_
  #define __AUDIO_CONST_I_H_

  #include "rvf/rvf_api.h"

  #ifdef __cplusplus
    extern "C"
    {
  #endif

  /* the task processes events with no time-out */
  #define AUDIO_BGD_NOT_TIME_OUT             (0)

  /* The audio background entity processes only the message sent to the following mail box */
  #define AUDIO_BGD_MBOX                     (RVF_TASK_MBOX_0)

  /* The audio entity takes into account only the following events: */
  #define AUDIO_BGD_TASK_MBOX_EVT_MASK       (RVF_TASK_MBOX_0_EVT_MASK)

  /* The audio background entity waits all event type */
  #define AUDIO_BGD_ALL_EVENT_FLAGS                       (0xFFFF)

  #ifdef __cplusplus
  }
  #endif

  #endif // #ifndef __AUDIO_CONST_I_H_
#endif // #ifdef RVM_AUDIO_BGD_SWE