flash.c

arm嵌入式开发实例

/**************************************************************************************************
 * FILENAME
 *     flash.c
 *
 * VERSION
 *     1.0
 *
 * DESCRIPTION
 *     This file contains the timer initial routine and timer ISR.
 *
 * DATA STRUCTURES
 *     None
 *
 * FUNCTIONS
 *     1. Fun_flash_writepage()
 *     2. Fun_flash_readpage()
 *	   3. Fun_wr_template()						
 *	   4. Fun_rd_template()						
 *	   5. Fun_del_template()						
 *
 * HISTORY
 *     10/28/2003		 Ver 1.0 Created by Hank Ji
 *
 * REMARK
 *     None
 *     
 *************************************************************************************************/
#include <stdio.h>
#include "740defs.h"

#define C_Flash
#include "ist.h"

/************************************************/
/*	Name: 	Fun_flash_writepage					*/
/*	In:		page--要写的页数					*/
/*	Out:	None								*/
/*	Description: 								*/
/*			写FLASH中的某页						*/
/************************************************/
void Fun_flash_writepage(uint16 page)
{
  uint32 i;
/* write register */ 
  Flash_Ctlreg1 = 0xaa;
  Flash_Ctlreg2 = 0x55;
  Flash_Ctlreg1 = 0xa0;

  for(i=0;i<128;i++)
  {
    VPchar(Flash_baseaddr+page*128+i) = flash_buffer[i];
  }
  
  Fun_delay_1ms(15);
}

/************************************************/
/*	Name: 	Fun_flash_readpage					*/
/*	In:		page--要读的页数					*/
/*	Out:	None								*/
/*	Description: 								*/
/*			读碏LASH中的某页					*/
/************************************************/
void Fun_flash_readpage(uint16 page)
{
  uint32 i;

  for(i=0;i<128;i++)
  {
    flash_buffer[i] = VPchar(Flash_baseaddr+page*128+i);
  }
}

/************************************************/
/*	Name: 	Fun_wr_template						*/
/*	In:	 UserNum： 	     要写的用户（1，2 or 3)	*/
/*		 pImageTemplate: 特征值存储缓冲指针		*/
/*	Out:	NONE								*/
/*	Description: 								*/
/*			写某个用户的指纹特征值				*/
/************************************************/
void Fun_wr_template(uint8 UserNumber,uint8 *pImageTemplate)
{
  uint16 num,page,i;
  uint8 j;
  uint32 y;
//  uint8 temp_buffer[128];

  Fun_rd_parameter();
start_wr:
  for(i=0;i<16;i++)
  {
     if((flash_buffer[i]==0xff)||(flash_buffer[i]==UserNumber))
     {  
       page = i;
       flash_buffer[i] = UserNumber;
       break; 
     }
  }
  
  num = MIN_template_size;
  
	//write template to flash
  for(i=0;i<32;i++)
  {
    if(num > 128)
    {
   	  for(j=0;j<128;j++)
   	  {
     	flash_buffer[j] = pImageTemplate[i*128+j];
      }
      Fun_flash_writepage(MA_USER1_PAGE + page*32 + i);
  	}
  	else
    {
   	  for(j=0;j<num;j++)
   	  {
     	flash_buffer[j] = pImageTemplate[i*128+j];
      }
      
   	  for(j=num;j<128;j++)
   	  {
     	flash_buffer[j] = 0xff;
      }
      
      Fun_flash_writepage(MA_USER1_PAGE + page*32 + i);
      break;
	}
	num = num - 128;  
  }

  for(i=0;i<MIN_template_size;i++)
  {
    y = Flash_baseaddr + (MA_USER1_PAGE+page*32)*128;
    if(pImageTemplate[i] != VPchar(y+i))
    {
      Fun_rd_parameter();
      flash_buffer[page] = 0xaa;
	  Fun_wr_parameter(); 
	  goto start_wr;
    }
  }  

	//then write parameter to flash page 0
//end_wr:
  Fun_rd_parameter();
  flash_buffer[page] = UserNumber;
  Fun_wr_parameter(); 
}


/************************************************/
/*	Name: 	Fun_rd_template						*/
/*	In:	 UserNum： 	     要读的用户（1，2 or 3)	*/
/*	Out: pImageTemplate: 特征值存储缓冲指针		*/
/*	Description: 								*/
/*			读某个用户的指纹特征值				*/
/************************************************/
void Fun_rd_template(uint8 UserNumber,uint8 *pImageTemplate)
{
  uint16 page,i;
  
  Fun_rd_parameter();
  for(i=0;i<16;i++)
  {
     if(flash_buffer[i]==UserNumber)
     {  
       page = i;
       break; 
     }
  }

  for(i=0;i<MIN_template_size;i++)
  {
    pImageTemplate[i] = VPchar(Flash_baseaddr+(page*32+MA_USER1_PAGE)*128+i);
  }
}

/************************************************/
/*	Name: 	Fun_del_template					*/
/*	In:	 	UserNum -- 要删除的用户（1，2 or 3)	*/
/*	Out: 	NONE								*/
/*	Description: 								*/
/*			删除某个用户						*/
/************************************************/
void Fun_del_template(uint8 UserNumber)
{
  uint8 i;
  Fun_rd_parameter();

  for(i=0;i<16;i++)
  {
     if(flash_buffer[i]==UserNumber)
     {  
       flash_buffer[i] = 0xff;
       break; 
     }
  }

//  flash_buffer[User1_inf_offset + UserNumber-1] = 0xff;

  Fun_wr_parameter();
}



uint8 Fun_rd_parameter(void)
{
  uint16 i;

  for(i=0;i<256;i++)
  {
    flash_buffer[i] = VPchar(Flash_baseaddr+MA_PARAM_PAGE1*128+i);
  }

  if(flash_buffer[Valid_inf_offset] == Valid_inf)
  {
	 if(flash_buffer[Valid_inf_offset+128] != Valid_inf)
  	 {
        Fun_flash_writepage(MA_PARAM_PAGE2);
     }
     return 1;
  }
  else
  {
	 if(flash_buffer[Valid_inf_offset+128] != Valid_inf)return 0;

     for(i=0;i<128;i++)
     {
       flash_buffer[i] = flash_buffer[i+128];
     }
		   
	 Fun_flash_writepage(MA_PARAM_PAGE1);
  
     return 2;
  }	
}

void Fun_wr_parameter(void)
{
  uint8 ch=0;
  uint8 i;

  for(i=0;i<127;i++)
  {
    ch = ch+ flash_buffer[i];
  }
  flash_buffer[127] = ch;
  flash_buffer[Valid_inf_offset] = Valid_inf;

  Fun_flash_writepage(MA_PARAM_PAGE1);
  Fun_flash_writepage(MA_PARAM_PAGE2);
}