psdflash.h

在FLASH中写入一个字节,用数据轮询的方式检测写入状态

/*--------------------------------------------------------------------------
PSDflash.H
--------------------------------------------------------------------------*/

#ifndef __PSDflash_H__
#define __PSDflash_H__


# define FLASH_COMMON1_XAAA (volatile uchar xdata*) 0x8aaa
# define FLASH_COMMON1_X555 (volatile uchar xdata*) 0x8555

# define FLASH_COMMON2_XAAA (volatile uchar xdata*) 0xaaaa
# define FLASH_COMMON2_X555 (volatile uchar xdata*) 0xa555





# define NVM_DATA_POLL 0x80          //数据轮询位DQ7
# define NVM_DATA_TOGGLE 0x40       //数据触发位DQ6
# define NVM_ERROR 0x20             //超时错误位DQ5

# define FALSE 0         
# define TRUE 1


static void Delay1(unsigned int n)
{
   unsigned int i;
   for (i=0;i<n; i++); 
}



//在FLASH中写入一个字节,用数据轮询的方式检测写入状态
unsigned  char  flash_write_1(volatile  unsigned  char  xdata*  addr,  unsigned char   dat)
 {
        unsigned  char  done ;
        unsigned char  error ;
        unsigned  char err    ;
        unsigned char  poll   ;
        
        unsigned  char  readback ;
        
        done = FALSE;
        err=FALSE;
  
      *(FLASH_COMMON1_X555)=0xaa ;  // 开启主FLASH，写入0XAA 到地址0XX555
      *(FLASH_COMMON1_XAAA)= 0x55 ;  // 开启主FLASH，写入 0X55 到地址0XX555
      *(FLASH_COMMON1_X555)=0xa0 ;    // 写入0XA0来编程字节
      *(addr) = dat ;                                      //    写入数据字节到FLASH
             dat =dat & NVM_DATA_POLL ;          //    获取先前数据的D7位
      do
              {
                   poll= *(addr) ;                                // 读取编程字节的状态字节
                   error=poll & NVM_ERROR;         // 保存DQS位的错误标志位
                   poll = poll & NVM_DATA_POLL;  // 从FLASH中读取的轮询字节获取DQ7位
          if ( dat ==poll)
                       done = TRUE;
                    else if (error == NVM_ERROR)
                       err = TRUE ;
                  } 
	  while( (done==FALSE) && (err == FALSE));
                  if ( err == TRUE)
                  {
                      poll = *(addr);
                      poll = poll & NVM_DATA_POLL;
                      if  (dat == poll)
                         done= TRUE;
                        *(FLASH_COMMON1_X555) = 0XF0;
                        }
                        readback = *(addr) ;
                        return (readback == dat);
                         
       }
      
//-----------------------------------------

unsigned  char  flash_write_2(volatile  unsigned  char  xdata*  addr,  unsigned char   dat)
 {
        unsigned  char  done ;
        unsigned char  error ;
        unsigned  char err    ;
        unsigned char  poll   ;
        
        unsigned  char  readback ;
        
        done = FALSE;
        err=FALSE;
  
      *(FLASH_COMMON2_X555)=0xaa ;  // 开启主FLASH，写入0XAA 到地址0XX555
      *(FLASH_COMMON2_XAAA)=0x55 ;  // 开启主FLASH，写入 0X55 到地址0XX555
      *(FLASH_COMMON2_X555)=0xa0 ;    // 写入0XA0来编程字节
      *(addr) = dat ;                                      //    写入数据字节到FLASH
             dat =dat & NVM_DATA_POLL ;          //    获取先前数据的D7位
      do
              {
                   poll= *(addr) ;                                // 读取编程字节的状态字节
                   error=poll & NVM_ERROR;         // 保存DQS位的错误标志位
                   poll = poll & NVM_DATA_POLL;  // 从FLASH中读取的轮询字节获取DQ7位
          if ( dat ==poll)
                       done = TRUE;
                    else if (error == NVM_ERROR)
                       err = TRUE ;
                  } 
	  while( (done==FALSE) && (err == FALSE));
                  if ( err == TRUE)
                  {
                      poll = *(addr);
                      poll = poll & NVM_DATA_POLL;
                      if  (dat == poll)
                         done= TRUE;
                        *(FLASH_COMMON2_X555)=0xf0;
                        }
                        readback = *(addr) ;
                        return (readback == dat);
                         
       }
      

//-----------------------------------------
//擦FLASH所有扇区

void flash_erase_all( void)
  {  
    *(FLASH_COMMON1_X555)  = 0xaa ;
    *(FLASH_COMMON1_XAAA)  = 0x55 ;
    *(FLASH_COMMON1_X555)  = 0x80 ; 
    *(FLASH_COMMON1_X555)  = 0xaa ;
    *(FLASH_COMMON1_XAAA)  = 0x55 ;
    *(FLASH_COMMON1_X555)  = 0x10 ;
    
    Delay1(5000);
    Delay1(5000);
    Delay1(5000);
    Delay1(5000);
    
    *(FLASH_COMMON2_X555)  = 0xaa ;
    *(FLASH_COMMON2_XAAA)  = 0x55 ;
    *(FLASH_COMMON2_X555)  = 0x80 ; 
    *(FLASH_COMMON2_X555)  = 0xaa ;
    *(FLASH_COMMON2_XAAA)  = 0x55 ;
    *(FLASH_COMMON2_X555)  = 0x10 ;
     
    Delay1(5000);
    Delay1(5000);
    Delay1(5000);
    Delay1(5000);
   
       }    
//-----------------------------------------
#endif