flash.c

基于MCU的U盘源码

#include <stdio.h> 
#include <stdlib.h>
#include <string.h>
#include "flash.h"
//#include "..\inc\44b.h"
//#include "..\inc\def.h"
//#include "..\inc\44blib.h"

extern void __RdPage528(U8 *);	/*these two function are writed in ASM*/
extern void __WrPage528(U8 *);
U8 Verify_Buf[528];
unsigned int Check_Flash_Id(void)
{
	int i;
	unsigned int id;

	FC_CMD;
	rKM29UXDATA = 0x90;

	FC_ADDR;
	rKM29UXDATA = 0;
	FC_DATA;

	for(i=0;i<10;i++);	//wait 100ns
	id = rKM29UXDATA<<8;
	id += rKM29UXDATA;
	FC_INACTIVE;
	return id;
}

void Flash_Reset()		//flash reset
{ 
	int i;
	//  rPDATC = rPDATC | WP;	//write unprotect
	FC_CMD;
	rKM29UXDATA = 0xff;	//reset command
	for (i=0;i<3000;i++);	//delay 	
}
/********************************************************/
/*功能：擦除FLASH的1Block(对应文件系统为1Cluster)          */
/*     每一个簇为16KB，因此KM29U128共有1024个簇            */
/*输入：unsigned int cluster/block(需要擦除的Block Number)*/
/*返回：OK或FAIL                                         */
/********************************************************/
unsigned char Erase_Cluster(unsigned int cluster) 
{
	unsigned int blockPage = (cluster<<5);
	int i;

	FC_CMD;
	rKM29UXDATA = 0x60;

	FC_ADDR;	     
	rKM29UXDATA = blockPage & 0xff;  
	rKM29UXDATA = (blockPage>>8) & 0xff;

	for(i=0;i<2;i++);		//tWC  50ns
    
	FC_CMD;
	rKM29UXDATA = 0xd0;
    
	for(i=0;i<3;i++);
    
	FC_DATA;
	WAITRB;					//wait max 3ms

	FC_CMD;
	rKM29UXDATA = 0x70;
	FC_DATA;
	if (rKM29UXDATA & 0x1) //erase error
	{
		FC_INACTIVE;
		return FAIL;
	}
	else 
	{
		FC_INACTIVE;   
		return OK;
	}
}
/********************************************************/
int VerifyPage(unsigned int block,unsigned int page,U8 *buffer)
{
	ReadPage(block,page,Verify_Buf);
	if(strncmp((char *)Verify_Buf,(char *)buffer,528)==0)
		return 1;
	else
		return 0;
}
/*****************************************************************/
/*功能：读取FLASH的某个Block中的1page数据                           */
/*     在文件系统中，有如下对应关系：Block=Cluster                   */
/*                               Page =Sector                    */
/*输入：unsigned int block,page,unsigned char *pPage(存放数据的地址)*/
/*****************************************************************/
void ReadPage(unsigned int block,unsigned int page,unsigned char *pPage)
{
	int i;
	unsigned int blockPage = (block<<5) + page;

	FC_CMD;               
	rKM29UXDATA = 0x00;
	FC_ADDR;
	rKM29UXDATA = 0;
	rKM29UXDATA = blockPage & 0xff;
	rKM29UXDATA = (blockPage>>8) & 0xff;
	for(i=0;i<3;i++);
	FC_DATA;
	WAITRB;	//random access ,wait max. 10us 
	__RdPage528(pPage);		//which is written with assemble in flash.s
	FC_INACTIVE;
}
/*****************************************************************/
/*功能：向FLASH的某个Block中的1page写入数据                         */
/*     在文件系统中，有如下对应关系：Block=Cluster                   */
/*                               Page =Sector                    */
/*输入：unsigned int block,page,unsigned char *pPage(存放数据的地址)*/
/*输出：0:Fail;1:OK                                               */
/*****************************************************************/
int WritePage(unsigned int block,unsigned int page,unsigned char *pPage)  
{
	unsigned int blockPage = (block<<5) + page;
	int i;
	U8 *Source;                                      //the begin addr of data to write
	Source=pPage;
	FC_CMD;
	rKM29UXDATA = 0x80;
	FC_ADDR;
	rKM29UXDATA = 0;
	rKM29UXDATA = blockPage & 0xff;
	rKM29UXDATA = (blockPage>>8) & 0xff;
	FC_DATA;
	for(i=0;i<528;i++)
		{rKM29UXDATA=*pPage++;}         //data input->as the same as _WrPage528()
	__WrPage528(pPage); //which is written with assemble in flash.s

	FC_CMD;
	rKM29UXDATA = 0x10;
	for(i=0;i<10;i++);  //twb=100ns. why is it 10? spec is false?  
                        //No. It's because of LED of PE1.
	WAITRB;	//wait max 500us;
	rKM29UXDATA = 0x70;
	FC_DATA;
	for(i=0;i<3;i++);  //twhr=60ns
	if((rKM29UXDATA & 0x1))	//			
	{
		FC_INACTIVE;	
		return 0;
	}
	else
	{
		FC_INACTIVE;	    
		#if (WRITEVERIFY==1)
			return VerifyPage(block,page,pPage);	
		#else
			return 1;
		#endif
	}
}
/*******************************************************************/
/*功能：显示FLASH的数据                                              */
/*     整个16MBFLASH空间的划分如下：                                  */
/*     Root：Cluster0                                               */
/*     Application：Cluster1~1023                                   */
/********************************************************************/
void Flash_Tools(unsigned int sectorShow,unsigned int clusterShow)
{
	unsigned char bbb[528];
	unsigned int i,sector,cluster;
//	Flash_Reset();
		i = 0;
		sector = sectorShow;
		cluster = clusterShow;
			ReadPage(cluster,sector,&(bbb[0]));
			Uart_Printf("\n*---------------------Cluster %4d, Sector %2d---------------------------*",cluster,sector);
				Uart_Printf("\nBYTE%4x:%4x%4x%4x%4x%4x%4x%4x%4x%4x%4x%4x%4x%4x%4x%4x%4x",\
				i,bbb[i],bbb[i+1],bbb[i+2],bbb[i+3],bbb[i+4],bbb[i+5],bbb[i+6],bbb[i+7],\
				bbb[i+8],bbb[i+9],bbb[i+10],bbb[i+11],bbb[i+12],bbb[i+13],bbb[i+14],bbb[i+15]);
}