csl_prevopen.c

TI达芬奇dm644x各硬件模块测试代码

/** @file csl_prevOpen.c
 *
 *    @brief    File for functional layer of CSL API @a CSL_prevOpen()
 *
 *  Description
 *    - The @a CSL_prevOpen() function definition & it's associated functions
 *
 *
 *  @date 18th October, 2004
 *  @author Vignesh LA.
 */

#include <csl_prev.h>
#include <_csl_resource.h>


#pragma CODE_SECTION (CSL_prevOpen, ".text:csl_section:prev");

extern void _CSL_prevGetAttrs(CSL_PrevNum prevNum , CSL_PrevHandle hPrev);

/** @brief Reserves the specified PREV for use. 
 */
CSL_PrevHandle CSL_prevOpen (
    /** Pointer to the object that holds reference to the
     *  instance of PREV requested after the call 
	 */
    CSL_PrevObj              *hPrevObj,
    /** Instance of PREV to which a handle is requested 
	 */
    CSL_PrevNum              prevNum,
    /** Specifies if PREV should be opened with exclusive or
     *  shared access to the associate pins 
	 */
    CSL_OpenMode            openMode,
    /** This returns the status (success/errors) of the call 
	 */
    CSL_Status              *status
	){

    CSL_PrevNum prevInst;
    CSL_PrevHandle hPrev = (CSL_PrevHandle)NULL;

    hPrevObj->openMode = openMode;
    
    if (prevNum >= 0 ) {
        _CSL_prevGetAttrs(prevNum, hPrevObj);
        hPrev = (CSL_PrevHandle)_CSL_certifyOpen((CSL_ResHandle)hPrevObj, status);
    }
    else {
		for(prevInst=(CSL_PrevNum)0;prevInst < (CSL_PrevNum)CSL_PREV_PER_CNT;++prevInst){
			_CSL_prevGetAttrs(prevInst, hPrevObj);
            hPrev = (CSL_PrevHandle)_CSL_certifyOpen((CSL_ResHandle)hPrevObj, status);
            if (*status == CSL_SOK) 
                break;
        }
        if (prevInst == CSL_PREV_PER_CNT) 
            *status = CSL_ESYS_OVFL;
    }

    return hPrev;
}