csl_vencopen.c

来自「TI达芬奇dm644x各硬件模块测试代码」· C语言 代码 · 共 66 行

/** @file csl_vencOpen.c
 *
 *    @brief    File for functional layer of CSL API @a CSL_vencOpen()
 *
 *  Description
 *    - The @a CSL_vencOpen() function definition & it's associated functions
 *
 *  Modification 1
 *    - Created on: 10/04/2004
 *    - Reason:       Created the sources
 *
 *  @date 4th October, 2004
 *  @author Santosh Narayanan.
 */

#include <csl_venc.h>
#include <_csl_resource.h>


#pragma CODE_SECTION (CSL_vencOpen, ".text:csl_section:venc");

extern void _CSL_vencGetAttrs(CSL_VencNum vencNum , CSL_VencHandle hVenc);

/** @brief Reserves the specified VENC for use. 
 */
CSL_VencHandle CSL_vencOpen (
    /** Pointer to the object that holds reference to the
     *  instance of VENC requested after the call 
	 */
    CSL_VencObj              *hVencObj,
    /** Instance of VENC to which a handle is requested 
	 */
    CSL_VencNum              vencNum,
    /** Specifies if VENC 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_VencNum vencInst;
    CSL_VencHandle hVenc = (CSL_VencHandle)NULL;

    hVencObj->openMode = openMode;
    
    if (vencNum >= 0 ) {
        _CSL_vencGetAttrs(vencNum, hVencObj);
        hVenc = (CSL_VencHandle)_CSL_certifyOpen((CSL_ResHandle)hVencObj, status);
    }
    else {
		for(vencInst=(CSL_VencNum)0;vencInst < (CSL_VencNum)CSL_VENC_PER_CNT;++vencInst){
			_CSL_vencGetAttrs(vencInst, hVencObj);
            hVenc = (CSL_VencHandle)_CSL_certifyOpen((CSL_ResHandle)hVencObj, status);
            if (*status == CSL_SOK) 
                break;
        }
        if (vencInst == CSL_VENC_PER_CNT) 
            *status = CSL_ESYS_OVFL;
    }


    return hVenc;
}