flash.c

基于ARM应用的源码

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "includes.h"  
#include "Flash.h"

WORD		bFlashOperationEnabled = FALSE;

SectorInfo sinfo320[67];

int FLASHTYPE(FlashInfo *fdev)
{
	int	i;
	ftype	val;
	WORD	wManufactureID, wDeviceID;

	val = Read_0000();

	/* Issue the autoselect command sequence: */
	Write_aa_to_5555();
	Write_55_to_2aaa();
	Write_90_to_5555();
	
	wManufactureID	= (WORD)Read_0000();	/* manufacturer ID */
	wDeviceID		= (WORD)Read_0001();	/* device ID */
	wManufactureID	&= 0xff;
	wDeviceID		&= 0xff;
	wManufactureID	<<= 8;
	wDeviceID		|= wManufactureID;

	fdev->id = (WORD)wDeviceID;

	/* Issue the read/reset command sequence: */
	Write_aa_to_5555();
	Write_55_to_2aaa();
	Write_f0_to_5555();

	/* The SGS29040 seems to need this, and it doesn't hurt anything */
	/* when using the AMD parts... */
	for(i=0;i<FLASH_TIMEOUT;i++) 
	{
		if (val == Read_0000())
			break;
	}
	return((int)(fdev->id));
}

int FLASHWRITE(ftype *dest,ftype *src,unsigned long  bytecnt)
{
	unsigned long 	i, ret,temp;
	ftype	val;
	int times_left,saveSyscfg;

	/* Each pass through this loop writes 'fdev->width' bytes... */
	ret = 0;
	OS_ENTER_CRITICAL();
    saveSyscfg=rSYSCFG;  
	rSYSCFG=SYSCFG_0KB; 
	for (i=0;i<bytecnt;i=i+2)
	{
		/* Flash write command */
		Write_aa_to_5555();
		Write_55_to_2aaa();
		Write_a0_to_5555();
		/* Write the value */      
		Fwrite(dest,src);	
		times_left = 50;
		while(1) {
			temp = *(ftype *)dest;
			if (Is_Equal(dest,src)) 
			{
				if (Is_Equal(dest,src))								 
					break;
			}

			times_left--;												
			if (!times_left) 
			{
				ret = -1;
				break;
			}	
			
		}
		dest++; src++;
	}

	rSYSCFG=saveSyscfg; 
	OS_EXIT_CRITICAL();

	return(ret);
}
///////////////////////////////////////////////////////////////////////////
int ReadFlash(long dest,unsigned char *buf,unsigned long  bytecnt)
{
    unsigned long  i;

	for (i=0;i<bytecnt;i+=2) 
	{	
		buf[i]   = *(ftype *)dest;
		buf[i+1] = (*(ftype *)dest)>>8;
		dest+=2;
	}    
}			 

int EraseFlash(int snum)
{
	ftype	val;
	DWORD	add,temp,temp1;
	int	ret, sector,times_left,saveSyscfg;
    ret = 0;
	add = (DWORD)(unsigned char *)FLASH_BANK0_BASE_ADDR;
	
	OS_ENTER_CRITICAL();
    saveSyscfg=rSYSCFG;  
	rSYSCFG=SYSCFG_0KB; 
	
	/* Erase the request sector(s): */
	for (sector=0;sector<64;sector++) 
	{
		if (snum == sector) 
		{
			/* Issue the sector erase command sequence: */
			temp=add<<1;
			Write_aa_to_5555();
			Write_55_to_2aaa();
			Write_80_to_5555();
			Write_aa_to_5555();
			Write_55_to_2aaa();   		
			Write_30_to_(temp);					
			/* Wait for sector erase to complete or timeout.. */
			/* DQ7 polling: wait for D7 to be 1. */
			/* DQ6 toggling: wait for D6 to not toggle. */
			/* DQ5 timeout: if DQ7 is 0, and DQ5 = 1, timeout. */
			times_left = 500000;
			while(1) 
			{				
				temp1 = *(ftype *)temp;
				if (Is_ff(temp)) 
				{
					if (Is_ff(temp))
						break;
				} 		
				
				times_left--;
				if (!times_left) 
				{
					ret = -1;
					break;
				}			
			}
		}

        add += 0x8000;
	}

	rSYSCFG=saveSyscfg; 
	OS_EXIT_CRITICAL();
	
	return(ret);
}