并口编程

开发平台：
Visual C++

sst28sf040.c：源码内容
							#include <stdio.h>
#include <windows.h>
#include <time.h>
#include <conio.h>
#include "s3c4510.h"
#include "sst28sf040.h"
void Disable_Chip_Data_Protection(void)
{
    access_bus(RS, 0x1823, 0, IP);
    read_rom(0x00001823);   // read data from 0x1823
    access_bus(RS, 0x1820, 0, IP);
    read_rom(0x00001820);   // read data from 0x1820
    access_bus(RS, 0x1822, 0, IP);
    read_rom(0x00001822);   // read data from 0x1822
    access_bus(RS, 0x0418, 0, IP);
    read_rom(0x00000418);   // read data from 0x0418
    access_bus(RS, 0x041b, 0, IP);
    read_rom(0x0000041B);   // read data from 0x041B
    access_bus(RS, 0x0419, 0, IP);
    read_rom(0x00000419);   // read data from 0x0419
    access_bus(RS, 0x041a, 0, IP);
    read_rom(0x0000041A);   // read data from 0x041A
    access_bus(RS, 0x041a, 0, IP);
}
void Enable_Chip_Data_Protection()
{
    access_bus(RS, 0x1823, 0, IP);
    read_rom(0x00001823);   // read data from 0x1823
    access_bus(RS, 0x1820, 0, IP);
    read_rom(0x00001820);   // read data from 0x1820
    access_bus(RS, 0x1822, 0, IP);
    read_rom(0x00001822);   // read data from 0x1822
    access_bus(RS, 0x0418, 0, IP);
    read_rom(0x00000418);   // read data from 0x0418
    access_bus(RS, 0x041b, 0, IP);
    read_rom(0x0000041B);   // read data from 0x041B
    access_bus(RS, 0x0419, 0, IP);
    read_rom(0x00000419);   // read data from 0x0419
    access_bus(RS, 0x040a, 0, IP);
    read_rom(0x0000040A);   // read data from 0x040A
    access_bus(RS, 0x040a, 0, IP);
}
int Check_SST_28SF040(void)
{
  
    BYTE SST_id1;
    BYTE SST_id2;
    int  ReturnStatus;
    BYTE OriginalByte;
    OriginalByte = read_rom(0x00000000);/* save the original memory contents  */
    write_rom(0x0000, RESET);           /* reset tje 28SF040 chip first       */
    write_rom(0x0000, READ_ID);         /* issue the READ_ID command          */
    SST_id1 = read_rom(0x00000000);     /* get first ID byte                  */
    SST_id2 = read_rom(0x00000001);     /* get second ID byte                 */
    if ((SST_id1 == SST_ID) && (SST_id2 == SST_28SF040))
        ReturnStatus = 0;
    else
        ReturnStatus = -1;
    write_rom(0x00000000, RESET);       /* issue RESET command to 28SF040      */
    if (ReturnStatus ==-1)  /* if not 28SF040, restore original contents  */
        write_rom(0x00000000, OriginalByte);
    return(ReturnStatus);
}
void Check_Toggle_Ready(DWORD Dst)
{
    unsigned char Loop = TRUE;
    unsigned char PreData;
    unsigned char CurrData;
    unsigned long TimeOut = 0;
    PreData = read_rom(Dst);
    PreData = PreData & 0x40;
    while ((TimeOut< 0x7FFFFFFF) && (Loop))
    {
        CurrData = read_rom(Dst);
        CurrData = CurrData & 0x40;
        if (PreData == CurrData)
            Loop = FALSE;        /* ready to exit the while loop */
        PreData = CurrData;
        TimeOut++;
    }
}
int Read_28SF040(FILE* stream, DWORD Src,DWORD size)
{
	int i,count;
	DWORD SrcReadAddress = Src;
	unsigned char cTemp;
	if( NULL == stream )
		return -1;
	fseek( stream,0,SEEK_SET );
	count = 0;
	for( i = 1; i <= (int)size; i++ ) 
	{
		cTemp = read_rom( SrcReadAddress++ );
		printf("%.2x ",cTemp);
		if( i%16 == 0 ) printf("n");
		fwrite((char*)&cTemp,sizeof(char),1,stream );
	}
	return 0;
}
int Write_28SF040(unsigned char *Src, DWORD Dst)
{
    unsigned char   *SourceBuf;
    DWORD           DestBuf;
    int             Index;
    int             Count;
    unsigned char   SourceByte;
    unsigned char   Continue;
    
    Disable_Chip_Data_Protection();
    SourceBuf = Src;
    DestBuf   = Dst;
    /************************************************************************************/
    /*                                      ERASE OPERATION                             */
    /*                                                                                  */ 
    /************************************************************************************/
    write_rom(DestBuf, AUTO_PG_ERASE1); /* erase the page before programming */
    write_rom(DestBuf, AUTO_PG_ERASE2);
    Check_Toggle_Ready(Dst);            /* wait for Toggle bit ready         */	
    Count = 0;
    Continue = TRUE;
/*    while ((Count < ROW_SIZE) && (Continue))
    {
        SourceByte = read_rom(DestBuf++);
        if (SourceByte == 0xFF)
            Count++;
        else
            Continue =  FALSE;
    }
    if (!Continue)
    {     
        Enable_Chip_Data_Protection();             
        return (TRUE);               
    }
*/
    /***********************************************************************************/
    /*                        PROGRAM  OPERATION                                       */
    /*                                                                                 */
    /***********************************************************************************/
    SourceBuf = Src;
    DestBuf = Dst;
    for (Index = 0; Index < ROW_SIZE; Index++)
    {
	    SourceByte = *SourceBuf++;
        if (SourceByte != 0xFF)             /* If the data is 0xFF, don,t program it*/
	    {
            write_rom(DestBuf,AUTO_PGRM);   /*issue AUTO PROGRAM command*/
            write_rom(DestBuf,SourceByte);  /* program the data */
            //Check_Toggle_Ready(Dst);        /* wait for Toggle bit ready */
            //ProgrammedByte = read_rom(DestBuf); /* read back the data pragrammed */
            //if (SourceByte != ProgrammedByte)
            //{
            //    Continue = FALSE;
            //    break;
            //}
        }
        DestBuf++;
    }
    Enable_Chip_Data_Protection();
    if (!Continue)
	    return(TRUE);                               /* return with error */
    else
	    return(FALSE);                              /* return with NO error */
}

						