rzkread.c

来自「zilog的实时操作系统RZK,可以移植到多种处理器上」· C语言 代码 · 共 62 行

/*
 * File       : RZKRead.c
 * Scope      : Scope is limited to only device driver framework.
 *
 * Description: This file implements the Read API of device driver framework
 *
 * Copyright 2004 ZiLOG Inc.  ALL RIGHTS RESERVED.
 *
 * This file contains unpublished confidential and proprietary information
 * of ZiLOG, Inc.
 * NO PART OF THIS WORK MAY BE DUPLICATED, STORED, PUBLISHED OR DISCLOSED 
 * IN ANY FORM WITHOUT THE PRIOR WRITTEN CONSENT OF ZiLOG, INC.
 * This is not a license and no use of any kind of this work is authorized
 * in the absence of a written license granted by ZiLOG, Inc. in ZiLOG's 
 * sole discretion 
 */


#include "ZTypes.h"
#include "ZSysgen.h"
#include "ZDevice.h"
#include "ZThread.h"
#include "ZInterrupt.h"
#include "externvar.h"

DDF_STATUS_t RZKDevRead( 
						RZK_DEVICE_CB_t *pdev,	// device id
						RZK_DEV_BUFFER_t *buf,		// buffer pointer where the data need to be stored
						RZK_DEV_BYTES_t nBytes	// input-bytes to read, output-bytes read
						 )
{
#ifdef RZK_DEBUG 
	// check for the device handle
	if( (pdev == NULL) || (buf == NULL) || !(nBytes) )
		return DDFERR_INVALID_ARGUMENTS ;
#endif /* */

	// now call the driver handler installed for the device
	if(pdev->fnRead)
		return (( * (pdev->fnRead) )( pdev, buf, nBytes ) );
	else
		return DDFERR_INVALID_INITIALIZER ;
}// end of RZKDevRead

DDF_STATUS_t RZKDevGetc(
						RZK_DEVICE_CB_t *pdev	// device id
						)
{
#ifdef RZK_DEBUG 
	// check for the device handle
	if(pdev == NULL )
		return DDFERR_INVALID_ARGUMENTS ;
#endif /* */

	// now call the driver handler installed for the device
	if(pdev->fnGetc)
		return (( * (pdev->fnGetc) )( pdev) );
	else
		return DDFERR_INVALID_INITIALIZER ;

}