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view cdg-hybrid/cdginc/p_aci.val @ 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 35f7a1dc9f7d
children
line wrap: on
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/*
+--------------------------------------------------------------------------+
| PROJECT : PROTOCOL STACK                                                 |
| FILE    : p_aci.val                                                      |
| SOURCE  : "sap\aci.pdf"                                                  |
| LastModified : "2004-06-01"                                              |
| IdAndVersion : "8411.105.00.205"                                         |
| SrcFileTime  : "Thu Nov 29 09:29:50 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_ACI_VAL
#define P_ACI_VAL


#define CDG_ENTER__P_ACI_VAL

#define CDG_ENTER__FILENAME _P_ACI_VAL
#define CDG_ENTER__P_ACI_VAL__FILE_TYPE CDGINC
#define CDG_ENTER__P_ACI_VAL__LAST_MODIFIED _2004_06_01
#define CDG_ENTER__P_ACI_VAL__ID_AND_VERSION _8411_105_00_205

#define CDG_ENTER__P_ACI_VAL__SRC_FILE_TIME _Thu_Nov_29_09_29_50_2007

#include "CDG_ENTER.h"

#undef CDG_ENTER__P_ACI_VAL

#undef CDG_ENTER__FILENAME


/*
 * Value constants for VAL_cmd_src
 */
#define CMD_SRC_INT                    (0x0)      /* Command from internal application */
#define CMD_SRC_EXT                    (0x1)      /* Command from external application */
#define CMD_SRC_UNKNOWN                (0xff)     /* Reserved                       */

/*
 * Value constants for VAL_urt_stat
 */
#define URT_RDY_TO_SEND                (0x0)      /* URT is ready to accept new data */
#define URT_DATA_AVAIL                 (0x1)      /* URT has data available         */
#define URT_STAT_UNKNOWN               (0xff)     /* Reserved                       */

/*
 * Value constants for VAL_cause
 */
#define ABT_ABORT_DATA                 (0x0)      /* Abort data mode                */
#define ABT_ABORT_CMD                  (0x1)      /* Abort current command          */

/*
 * Value constants for VAL_ackflg
 */
#define ACI_NAK                        (0x0)      /* Not Acknowledge                */
#define ACI_ACK                        (0x1)      /* Acknowledge                    */

/*
 * user defined constants
 */
#define MAX_CMD_LEN                    (0x17c)    
#define MAX_TRC_LEN                    (0x50)     
#define MAX_DATA_LEN                   (0xc8)     

#include "CDG_LEAVE.h"


#endif