init_ram.c

基于一款32位嵌入式微处理器的USB接口的测试代码

/**************************************************************************************
 *
 *  (c) 2004 ASIC,all rights reserved
 *         
 *           
 *	This source code and any compilation or derivative thereof 
 *	is proprietary information and is confidential in nature.
 *	Under no circumstance is this software to be exposed or placed
 *	under an open source License of any type without expressed
 *	written permission of ASIC.  
 *
 *	filename:	init_ram.c          
 *	derciption:
 *				this file contains the function init_ram_size to initilization the size of
 * 				ramdisk.
 *	history:
 *
 *    Version         Date            Author            Comments
 *------------------------------------------------------------------------------------    
 *     1.1          2004.5.20           xl             Initial Creation
 *   	
 **************************************************************************************/
#include "HA_TypeDef.h"


#include "debug.h"
#include "gfd_lib.a"

extern UINT32 NUM_RAMDISK_BLOCK;
extern void ENT_INT_GPT( void );



/************************************************************************
*
*  FUNCTION
*
*      init_ram_size
*
*  DESCRIPTION
*
* 		实现ramdisk大小设置 
*
*	INPUTS
*		UINT16 num       ramdisk页数目，ramdisk的容量大小为num*4k byte	
*
*  OUTPUTS
*
*      none
*
************************************************************************/
void init_ram_size(UINT16 num) 
{
	if((num>2048)||(num<0))
	{		
		printf("please input the correct ramdisk page number!\n");
		printf("MUST BE Less Than 2048!\n");
	}
	else
	{	
		num = num -num%8;	
		NUM_RAMDISK_BLOCK = (UINT32)num*RAMDISK_PAGE_SIZE;
	}
	return;
}