iee1.c

飞思卡尔ee的运用

**         Addr            - EEPROM Address
**       * Data            - A pointer to the returned 8-bit data
**     Returns     :
**         ---             - Error code, possible codes: 
**                           - ERR_OK - OK 
**                           - ERR_BUSY - device is busy 
**                           - ERR_RANGE - parameter Addr is out of range
** ===================================================================
*/
byte IEE1_GetByte(IEE1_TAddress Addr,byte *Data)
{
    
  if((Addr < IEE1_AREA_START) || (Addr > IEE1_AREA_END)) { /* Is given address out of EEPROM area array ? */
    return ERR_RANGE;                  /* If yes then error */
  }
  if((ESTAT & 192) != 192) {           /* Is reading from EEPROM possible? */
    return ERR_BUSY;                   /* If no then error */
  }
  *Data = *((volatile byte *) Addr);   /* Return data from given address */
  return ERR_OK;                       /* OK */
}

/*
** ===================================================================
**     Method      :  IEE1_SetWord (bean IntEEPROM)
**
**     Description :
**         This method writes a given word (2 bytes) to the specified
**         address in EEPROM. The method also sets address pointer for
**         <SetActByte> and <GetActByte> methods (applicable only if
**         these methods are enabled). The pointer is set to address
**         passed as the parameter + 1.
**     Parameters  :
**         NAME            - DESCRIPTION
**         Addr            - Address to EEPROM
**         Data            - Data to write
**     Returns     :
**         ---             - Error code, possible codes: 
**                           - ERR_OK - OK 
**                           - ERR_SPEED - the bean does not work in the
**                           active speed mode 
**                           - ERR_BUSY - device is busy 
**                           - ERR_VALUE - verification of written data
**                           failed (read value does not match with
**                           written value) 
**                           - ERR_NOTAVAIL - other device-specific
**                           error 
**                           - ERR_RANGE - selected address out of the
**                           selected address range
** ===================================================================
*/
byte IEE1_SetWord(IEE1_TAddress Addr,word Data)
{

    
  if((Addr < IEE1_AREA_START) || (Addr > IEE1_AREA_END)) { /* Is given address out of EEPROM area array ? */
    return ERR_RANGE;                  /* If yes then error */
  }
  if (Addr & 0x0001) {                 /* Aligned address ? */
    return ERR_NOTAVAIL;
  }
  if((ESTAT & 192) != 192) {           /* Is reading from EEPROM possible? */
    return ERR_BUSY;                   /* If no then error */
  }
  if (*(volatile word *)(Addr) == 65535) { /* Is given EEPROM row erased ? */
    return (WriteWord(Addr,Data));     /* Write new content */
  } else {                             /* Is given address non-erased ? */
    if (Addr & 2) {                    /* Is given address from high part of the sector ? */
      return (WriteSector(Addr & 65532,(dword)Data | ((*(dword *)(Addr & 65532) & 4294901760))));
    }
    else {                             /* Is given address from low part of the sector ? */
      return (WriteSector(Addr,((dword)Data << 16) | (*(volatile word *)(Addr + 2))));
    }
  }
}

/*
** ===================================================================
**     Method      :  IEE1_GetWord (bean IntEEPROM)
**
**     Description :
**         This method reads a word (2 bytes) from the specified EEPROM
**         address. The method also sets address pointer for
**         <SetActByte> and <GetActByte> methods (applicable only if
**         these methods are enabled). The pointer is set to address
**         passed as the parameter + 1.
**     Parameters  :
**         NAME            - DESCRIPTION
**         Addr            - Address to EEPROM
**       * Data            - Pointer to returned 16-bit data
**     Returns     :
**         ---             - Error code, possible codes: 
**                           - ERR_OK - OK 
**                           - ERR_BUSY - device is busy 
**                           - ERR_RANGE - selected address out of the
**                           selected address range
** ===================================================================
*/
byte IEE1_GetWord(IEE1_TAddress Addr,word *Data)
{
    
  if((Addr < IEE1_AREA_START) || (Addr > IEE1_AREA_END)) { /* Is given address out of EEPROM area array ? */
    return ERR_RANGE;                  /* If yes then error */
  }
  if((ESTAT & 192) != 192) {           /* Is reading from EEPROM possible? */
    return ERR_BUSY;                   /* If no then error */
  }
  *Data = *(volatile word *)(Addr);    /* Return data from given address */
  return ERR_OK;                       /* OK */
}

/*
** ===================================================================
**     Method      :  IEE1_EraseEeprom (bean IntEEPROM)
**
**     Description :
**         The method mass erases all EEPROM memory. The method also
**         sets address pointer for <SetActByte> and <GetActByte>
**         methods (applicable only if these methods are enabled). The
**         pointer is set to address passed as the parameter - 1.
**     Parameters  :
**         NAME            - DESCRIPTION
**         Addr            - Pass any valid EEPROM address. EEPROM
**                           module in some CPU families don't require
**                           address for mass erase, then the parameter
**                           is ignored.
**     Returns     :
**         ---             - Error code, possible codes: 
**                           - ERR_OK - OK 
**                           - ERR_SPEED - the bean does not work in the
**                           active speed mode 
**                           - ERR_BUSY - device is busy 
**                           - ERR_NOTAVAIL - other device-specific error
** ===================================================================
*/
byte IEE1_EraseEeprom(IEE1_TAddress Addr)
{
  if((ESTAT & 192) != 192) {           /* Is reading from EEPROM possible? */
    return ERR_BUSY;                   /* If no then error */
  }
  /* ESTAT: PVIOL=1,ACCERR=1 */
  ESTAT = 48;                          /* Clear error flags */
  *(volatile word *)(Addr) = 0;        /* Array address */
  /* ECMD: ??=0,CMDB6=1,CMDB5=0,??=0,??=0,CMDB2=0,??=0,CMDB0=0 */
  ECMD = 65;                           /* Mass erase command */
  ESTAT = 128;                         /* Clear flag command buffer empty */
  if ((ESTAT_PVIOL == 1) || (ESTAT_ACCERR == 1)) { /* Is protection violation or acces error detected ? */
    return ERR_NOTAVAIL;               /* If yes then error */
  }
  return ERR_OK;                       /* OK */
}

/*
** ===================================================================
**     Method      :  IEE1_Init (bean IntEEPROM)
**
**     Description :
**         Initializes the associated peripheral(s) and the bean internal 
**         variables. The method is called automatically as a part of the 
**         application initialization code.
**         This method is internal. It is used by Processor Expert only.
** ===================================================================
*/
void IEE1_Init(void)
{
  ECLKDIV = 74;                        /* Set up Clock Divider Register */
}

/* END IEE1. */

/*
** ###################################################################
**
**     This file was created by UNIS Processor Expert 2.98 [03.98]
**     for the Freescale HCS12 series of microcontrollers.
**
** ###################################################################
*/