romdrv.c

一个操作系统源代码 用于嵌入式设备 在Vc++环境下仿真 成功移植到多款处理器上

/***************************************************************************************\
 *
 * Copyright (c) 2001 National ASIC Center, All Rights Reserved
 *
 * File Name	:	romdrv.c
 * Version		:	1.0
 * Programmer	:	longn_qi
 * 
 * Date of Creation:	2001/11/26
 * Date of Last Modify:	2001/11/27
 *
 * Description:	This is an application file for simulating ROM.
 *
 * Local Function List:
 * void InitROM( )
 * void FlashUnlockBlock( unsigned char *Address )			(empty)
 * void FlashLockBlock( unsigned char *Address )			(empty)
 * void FlashEraseBlock( unsigned char *Address )
 * unsigned char FlashWriteByte( unsigned char *Address, unsigned char Data )
 * unsigned char *FlashWriteBlock( unsigned char *Address, unsigned char *Data, unsigned long len )
 * void CopyFlashProgram( )									(empty)
 * void WriteFlashProgram( unsigned char *address, unsigned char *data, unsigned long len )		(empty)
 * unsigned long FlashReadByte( unsigned char *Address, unsigned char buffer )
 * unsigned long FlashReadBlock( unsigned char *Address, unsigned char *buffer, unsigned long len )
 *
 * Global Variable List:
 * None
 *
 * Note:		Further file description refers to simdrv.txt
 *
 ***************************************************************************************
 *
 * Modification History
 *
 * 2001/11/27		by longn_qi		add functions "FlashReadByte" and "FlashReadBlock".
 * 2001/11/26		by longn_qi		create file.
 *
\***************************************************************************************/

/* System or Standard Header */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <flash.h>

#define ROM_PAGE_SIZE			65536							// 64KB per ROM page
#define ROM_PAGE_NUM			2								// number of ROM page
#define ROM_SIZE				(ROM_PAGE_SIZE*ROM_PAGE_NUM)	// ROM size (16MByte)

static FILE *fpROM = NULL;										// simulate ROM as file
const char *romFilePath = "config\\rom.bin";					

FBP FlashUnlockBlockP = (FBP)FlashUnlockBlock;
FBP FlashLockBlockP = (FBP)FlashLockBlock;
FBP FlashEraseBlockP = (FBP)FlashEraseBlock;
FWP FlashWriteByteP = (FWP)FlashWriteByte;
FWBP FlashWriteBlockP = (FWBP)FlashWriteBlock;
FRBP FlashReadBlockP = (FRBP)FlashReadBlock;

void InitROM( )
{
	unsigned char *page;
	unsigned short i;

	fpROM = fopen( romFilePath, "rb" );
	if( fpROM == NULL )
	{
		fpROM = fopen( romFilePath, "wb" );
		page = (unsigned char *)malloc( ROM_PAGE_SIZE );
		memset( page, 0xff, ROM_PAGE_SIZE );
		for( i=0; i<ROM_PAGE_NUM; i++)
			fwrite( page, ROM_PAGE_SIZE, 1, fpROM );
		free( page );
	}
	fclose( fpROM );
}	

void FlashUnlockBlock( unsigned long Address )
{

}

void FlashLockBlock(  unsigned long Address )
{
}

void FlashEraseBlock( unsigned long Address )
{
	unsigned long offset = Address;
	unsigned char *page;
	
	fpROM = fopen( romFilePath, "r+b" );
	if( fpROM == NULL || offset >= ROM_SIZE )
		return;

	fseek( fpROM, offset, SEEK_SET);
	page = (unsigned char *)malloc( ROM_PAGE_SIZE );
	memset( page, 0xff, ROM_PAGE_SIZE );
	fwrite( page, ROM_PAGE_SIZE, 1, fpROM );

	free( page );
	fclose( fpROM );

}

unsigned char FlashWriteByte( unsigned long Address, unsigned char Data )
{
	unsigned long offset = Address;

	fpROM = fopen( romFilePath, "r+b" );
	if( fpROM == NULL || offset >= ROM_SIZE )
		return 0;

	fseek( fpROM, offset, SEEK_SET);
	fwrite( &Data, 1, 1, fpROM );

	fclose( fpROM );
	return 1;
}	 /* if Write OK	return(1)
					       else return(0)  */
unsigned long FlashWriteBlock( unsigned long Address, unsigned long DataAd, unsigned long len )
{
	unsigned long offset = Address;

	fpROM = fopen( romFilePath, "r+b" );
	if( fpROM == NULL || offset >= ROM_SIZE || offset + len > ROM_SIZE )
		return 0;

	fseek( fpROM, offset, SEEK_SET);
	fwrite( (unsigned char *)DataAd, len, 1, fpROM );
	
	fclose( fpROM );
	return Address;
}

void CopyFlashProgram( )
{
}

void WriteFlashProgram( unsigned long address, unsigned long DataAd, unsigned long len )
{
}

unsigned long FlashReadByte( unsigned long buffer, unsigned long Address )
{
	unsigned long offset = Address, res;

	fpROM = fopen( romFilePath, "r+b" );
	if( fpROM == NULL || offset >= ROM_SIZE )
		return 0;

	fseek( fpROM, offset, SEEK_SET);
	res = fread( (unsigned char *)buffer, 1, 1, fpROM );

	fclose( fpROM );
	return res;
}	 

unsigned long FlashReadBlock( unsigned long buffer, unsigned long Address, unsigned long len )
{
	unsigned long offset = Address, res;

	fpROM = fopen( romFilePath, "r+b" );
	if( fpROM == NULL || offset >= ROM_SIZE || offset + len > ROM_SIZE )
		return 0;

	fseek( fpROM, offset, SEEK_SET);
	res = fread( (unsigned char *)buffer, len, 1, fpROM );

	fclose( fpROM );
	return res;
}