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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 35f7a1dc9f7d
children
line wrap: on
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/*
+--------------------------------------------------------------------------+
| PROJECT : PROTOCOL STACK                                                 |
| FILE    : p_fad.val                                                      |
| SOURCE  : "sap\fad.pdf"                                                  |
| LastModified : "2002-04-22"                                              |
| IdAndVersion : "8411.103.00.305"                                         |
| SrcFileTime  : "Thu Nov 29 09:41:22 2007"                                |
| Generated by CCDGEN_2.5.5A on Fri Oct 14 21:41:52 2016                   |
|           !!DO NOT MODIFY!!DO NOT MODIFY!!DO NOT MODIFY!!                |
+--------------------------------------------------------------------------+
*/

/* PRAGMAS
 * PREFIX                 : NONE
 * COMPATIBILITY_DEFINES  : NO (require PREFIX)
 * ALWAYS_ENUM_IN_VAL_FILE: NO
 * ENABLE_GROUP: NO
 * CAPITALIZE_TYPENAME: NO
 */


#ifndef P_FAD_VAL
#define P_FAD_VAL


#define CDG_ENTER__P_FAD_VAL

#define CDG_ENTER__FILENAME _P_FAD_VAL
#define CDG_ENTER__P_FAD_VAL__FILE_TYPE CDGINC
#define CDG_ENTER__P_FAD_VAL__LAST_MODIFIED _2002_04_22
#define CDG_ENTER__P_FAD_VAL__ID_AND_VERSION _8411_103_00_305

#define CDG_ENTER__P_FAD_VAL__SRC_FILE_TIME _Thu_Nov_29_09_41_22_2007

#include "CDG_ENTER.h"

#undef CDG_ENTER__P_FAD_VAL

#undef CDG_ENTER__FILENAME


/*
 * Value constants for VAL_trans_rate
 */
#define R_BCS                          (0x12c)    /* rate 300 bit/s                 */
#define R_2400                         (0x960)    /* rate 2400 bit/s                */
#define R_4800                         (0x12c0)   /* rate 4800 bit/s                */
#define R_7200                         (0x1c20)   /* rate 7200 bit/s                */
#define R_9600                         (0x2580)   /* rate 9600 bit/s                */
#define R_12000                        (0x2ee0)   /* rate 12000 bit/s               */
#define R_14400                        (0x3840)   /* rate 14400 bit/s               */

/*
 * Value constants for VAL_mode
 */
#define MUX_OFF                        (0x0)      /* ignore                         */
#define MUX_BCS                        (0x1)      /* BCS data                       */
#define MUX_MSG                        (0x2)      /* MSG  data                      */

/*
 * Value constants for VAL_cause
 */
#define ERR_REM_FAD                    (0xcc00)   /* reserved                       */
#define ERR_REM_PREAMBLE               (0xcc11)   /* DATA received instead of PREAMBLE - Preamble too short */
#define ERR_REM_DATA_BCS               (0xcc12)   /* DATA received from remote modem during BCS phase */
#define ERR_REM_TRAIN_START            (0xcc13)   /* DATA received from remote modem at start of training */
#define ERR_REM_NO_TRAINING            (0xcc14)   /* DATA received from remote modem prior to training */
#define ERR_REM_TRAINING               (0xcc15)   /* DATA received from remote modem during training */
#define ERR_REM_MSG                    (0xcc16)   /* DATA received from remote modem while sending MSG data */
#define ERR_REM_PREAMBLE_SHORT         (0xcc17)   /* PREAMBLE received from remote station too short */
#define ERR_REM_PREAMBLE_LONG          (0xcc18)   /* PREAMBLE received from remote station too long */
#define ERR_REM_IDENT                  (0xcc19)   /* Incorrect identification from remote modem */
#define ERR_LOCAL_FAD                  (0xcc20)   /* reserved                       */
#define ERR_LOCAL_BCS_RATE             (0xcc21)   /* BCS rate requested by local modem (MSG phase) */
#define ERR_LOCAL_MSG_RATE             (0xcc22)   /* MSG rate requested by local modem (BCS phase) */
#define ERR_LOCAL_DATA_NULL            (0xcc23)   /* DATA request received from T30 in NULL state */
#define ERR_LOCAL_DATA_BCS             (0xcc24)   /* DATA request received from T30 while receiving BCS data */
#define ERR_LOCAL_DATA_TCF_SND         (0xcc25)   /* DATA request received from T30 while sending TCF  data */
#define ERR_LOCAL_DATA_TCF_RCV         (0xcc26)   /* DATA request received from T30 while receiving TCF  data */
#define ERR_LOCAL_DATA_MSG             (0xcc27)   /* DATA request received from T30 while receiving MSG data */
#define ERR_LOCAL_DATA_UNDEF           (0xcc28)   /* DATA request received from T30 - state unknown */
#define ERR_LOCAL_DATA_MSG_UFL         (0xcc29)   /* DATA request not received from T30 - MSG-REC underflow */
#define ERR_LOCAL_IDENT                (0xcc30)   /* Incorrect identification from local modem */
#define ERR_OWN_FAD                    (0xcc40)   /* reserved                       */
#define ERR_FAD_SUB_TRAIN              (0xcc41)   /* FAD in unknown substate during training */
#define ERR_FAD_SUB_TCF                (0xcc42)   /* FAD in unknown substate (TCF)  */
#define ERR_FAD_SUB_MSG                (0xcc43)   /* FAD in unknown substate (MSG)  */
#define ERR_GENERAL_FAD                (0xcc50)   /* reserved                       */
#define ERR_INVALID_DATA_RCV           (0xcc51)   /* invalid data received          */
#define ERR_EMPTY_BUFFER               (0xcc52)   /* send/receive buffer is empty   */
#define ERR_OVERFLOW_BCS_RCV           (0xcc52)   /* buffer  overflow while receiving BCS data */
#define ERR_NOT_SET                    (0xccff)   /* error not set                  */

/*
 * user defined constants
 */
#define DUMMY_FAD                      (0x0)      

#include "CDG_LEAVE.h"


#endif