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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
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/*
*******************************************************************************
*
*      COPYRIGHT (C) 2000 BY ERICSSON EUROLAB DEUTSCHLAND GmbH
*      90411 NUERNBERG, GERMANY, Tel Int + 49 911 5217 100
*
*      The program(s) may be used and/or copied only with the
*      written permission from Ericsson or in accordance
*      with the terms and conditions stipulated in the agreement or
*      contract under which the program(s) have been supplied.
*
*******************************************************************************
*
*      File             : diag_interleaver.h
*      Purpose          : diagonal (chain) interleaver routine
*
*******************************************************************************
*/
#ifndef diag_interleaver_h
#define diag_interleaver_h "$Id: $"

/*
*******************************************************************************
*                         INCLUDE FILES
*******************************************************************************
*/

#include "init_interleaver.h"


/*
*******************************************************************************
*                         DECLARATION OF PROTOTYPES
*******************************************************************************
*/

/* ---------------------------------------------------------------------- */
/* diag_interleaver:                                                      */
/* Diagonal (chain) interleaver, based on block-by-block processing.      */
/* An arbitrary number of bits can be interleaved, depending of the       */
/* value num_bits. The vector "out", which must have the same             */
/* length than "in", contains the interleaved samples.                    */
/* All states (memory etc.) of the interleaver are stored in the variable */
/* *intl_state. Therefore, a pointer to this variable must be handled to  */
/* this function. This variable initially has to be initialized by the    */
/* function init_interleaver, which offers also the possibility to        */
/* specify the dimensions of the interleaver matrix.                      */
/* ---------------------------------------------------------------------- */

void diag_interleaver(WORD16 *out,
                      WORD16 *in,
                      WORD16  num_bits,
                      interleaver_state_t *intl_state);

/* ---------------------------------------------------------------------- */
/* diag_interleaver_flush:                                                */
/* Execution of the diagonal (chain) interleaver without writing in new   */
/* samples. The number of calculated output samples is returned via the   */
/* value *num_bits.                                                       */
/* ---------------------------------------------------------------------- */

void diag_interleaver_flush(WORD16 *out,
                            WORD16 *num_bits,
                            interleaver_state_t *intl_state);

#endif