csl_intcclose.c

TI达芬奇dm644x各硬件模块测试代码

/*  ============================================================================
 *   Copyright (c) Texas Instruments Inc 2002, 2003, 2004, 2005
 *
 *   Use of this software is controlled by the terms and conditions found in the
 *   license agreement under which this software has been supplied.
 *   ===========================================================================
 */
/** @file  csl_intcClose.c
 *
 *  @brief  File for functional layer of CSL API @a CSL_intcClose()
 *
 *  Description
 *  - @a CSL_intcClose() function definition
 *
 *  Path: \\(CSLPATH)\\soc\\davinci\\arm9\\src\\intc
 *
 *  Modification
 *  - Modified on: 2004/06/07 (Francis S)
 *  - Reason: Added critical section protection.
 *          : Added Interrupt Priority mask
 *
 *  - Modified on: 2004/04/15
 *  - Reason: creation
 *
 *  Date   2004/04/15
 *  Author RG Kiran
 *
 */

#include <csl_intc.h>
#include <csl_error.h>
#include <csl_types.h>
#include <csl_sysData.h>

/** =============================================================================
 *   @n@b CSL_intcClose
 *
 *   @b Description
 *   @n Releases an allocated event. CSL_intcClose () must be called to
 *      release an event that has been previously allocated with a call
 *      to CSL_intcOpen ().
 *
 *   @b Arguments
 *   @verbatim
            hIntc            Handle identifying the event
     @endverbatim
 *
 *   <b> Return Value </b>  CSL_Status
 *   @li                    CSL_SOK             - Close successful
 *   @li                    CSL_ESYS_FAIL       - Close failed
 *
 *   @b Example
 *   @verbatim
            CSL_IntcHandle       hIntc;
            CSL_status           status;
            ...

            status = CSL_intcClose(hIntc);
            if (status != CSL_SOK) {
                // close failed! //
            }
     @endverbatim
 * =============================================================================
 */
#pragma CODE_SECTION (CSL_intcClose, ".text:csl_section:intc");
CSL_Status CSL_intcClose (
    CSL_IntcHandle         hIntc
)
{
    CSL_Status closeStatus = CSL_ESYS_BADHANDLE;

    if (hIntc != CSL_INTC_BADHANDLE) {

        register int evt = hIntc->eventId;

        if ((evt != CSL_INTC_EVENTID_INVALID) &&
            (evt >= _CSL_INTC_EVENTID__INTC1START)) {

            int n = evt - _CSL_INTC_EVENTID__INTC1START;
            int x = 1 << (n % 32);
            int y = n / 32;
            CSL_sysDataHandle->intcAllocMask[y] &=~ x; /* clear bit -> unused */

            hIntc->eventId  = CSL_INTC_EVENTID_INVALID;
            hIntc->vectId   = CSL_INTC_VECTID_INVALID;
            hIntc->priority = CSL_INTC_PRIORITY_INVALID;
            closeStatus     = CSL_SOK;

        }

    }

    return closeStatus;
}