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MSP430 Flash編程程序

MSP430 Flash編程程序

作者:jdzj868 來源:機電之家下載站錄入:jdzj868 更新時間：2009-12-3 16:29:41 點擊數(shù)：0

【字體：

】

//flash.c文件
#define __FLASH__
#define __HW_v_2_1__
#include "flash.h"
/*************************************************************************************************
* This section contains all FLASH memory relevant functions:                               *
*    writeByte                                                                            *
*    writeWord                                                                            *
*    eraseFLASH                                                                            *
*    saveInfoFlash                                                                         *
*    changeInfo                                                                            *
*    updateInfo                                                                            *
*                                                                                              *
*************************************************************************************************/
/*************************************************************************************************
Function :    flash_writeFLASH
Parameter :    *dst : address within the FLASH page
            value : BYTE that has to be written to FLASH
Date :          08.09.2001 / 17.11.2002 / 22.11.2002
Description : this function writes a byte to an address in FLASH memory
            warning: in FLASH only zeros can be written. if a bit value needs to be set to
            one from zero, the whole page has to be erased, thus setting all bits to one.
            then the value can be written correctly. this function does not perform the
            necessary FLASH page erase.
*************************************************************************************************/
void flash_writeByte(BYTE *dst, BYTE value)
{
FCTL2 = FWKEY | FSSEL0 | 20;    //clock source is MCLK, divisor is 20
do
{
_NOP();
} while(FCTL3 & 0x0001);          // wait for BUSY to reset
FCTL3 = FWKEY;                   // reset the LOCK bit to enable program/erase
FCTL1 = FWKEY | WRT;             // set WRT for single acces

*dst = value;                   // do the write as a byte

return;
}

/*************************************************************************************************
Function :    flash_writeWord
Parameter :    *dst : address within the FLASH page
            value : BYTE that has to be written to FLASH
Date :          22.11.2002
Description : this function writes a word to an address in FLASH memory
            warning: in FLASH only zeros can be written. if a bit value needs to be set to
            one from zero, the whole page has to be erased, thus setting all bits to one.
            then the value can be written correctly. this function does not perform the
            necessary FLASH page erase.
*************************************************************************************************/
void flash_writeWord(WORD *dst, WORD value)
{
FCTL2 = FWKEY | FSSEL0 | 20;    //clock source is MCLK, divisor is 20
do
{
_NOP();
} while(FCTL3 & 0x0001);          // wait for BUSY to reset
FCTL3 = FWKEY;                   // reset the LOCK bit to enable program/erase
FCTL1 = FWKEY | WRT;             // set WRT for single acces

*dst = value;                   // do the write as a word

return;
}

/*************************************************************************************************
Function :    flash_eraseFLASH
Parameter :    *seg : any address within the FLASH page that is to be erased
Date :          08.09.2001 / 19.11.2002
Description : this function erases a FLASH page
*************************************************************************************************/
void flash_eraseFLASH(BYTE *seg)
{
FCTL2 = FWKEY | FSSEL0 | 20;    //clock source is MCLK, divisor is 20
do
{
_NOP();
} while(FCTL3 & 0x0001);          // wait for BUSY to reset
FCTL3 = FWKEY;                   // reset the LOCK bit to enable program/erase
FCTL1 = FWKEY | ERASE;          // set single segment erase function

*seg = 0xFF;                      // do a dummy write to start erase

FCTL3 = FWKEY | LOCK;             // lock the flash again

return;
}

/*************************************************************************************************
Function :    flash_saveInfoFlash
Parameter :    *container : pointer to updated copy of data in RAM
            *flashPageBase : pointer to start of destination flash segment
Date :          11.09.2002 / 26.11.2002
Description : saves info flash page 0 to RAM (!!! works only for INFO flash access !!!)
*************************************************************************************************/
void flash_saveInfoFlash(BYTE *container, BYTE *flashPageBase)
{
BYTE i;

flashPageBase = (BYTE*)((WORD)(flashPageBase) & 0xFF80); // wrap around for flash page base address

for(i=0;i<128;i++)
{
container = *flashPage++;
}
}

/*************************************************************************************************
Function :    flash_changeInfo
Parameter :    *container : pointer to updated copy of data in RAM
            *pointer : original pointer to variable that has to be updated
            value    : new value for variable
Date :          11.09.2002 / 26.11.2002
Description : chages a word in the info flash 0 data (in RAM)
*************************************************************************************************/
void flash_changeInfo(BYTE* containerBase, BYTE *pointer, BYTE value)
{
// pointer points into flash page to variable that is supposed to be changed
// subtract flash page offset (0x1000) and add scratch pad offset
pointer = (BYTE*)(((WORD)(pointer) & 0x7F) + (WORD)(containerBase));
*pointer = value;
}

/*************************************************************************************************
Function :    flash_update
Parameter :    *container : pointer to updated copy of data in RAM
            *flashPageBase : pointer to start of destination flash segment
Date :          11.09.2002 / 26.11.2002
Description : erases the flash page and writes the values from the RAM save area to flash
            (!!! works only in INFO flash !!!)
*************************************************************************************************/
void flash_updateInfo(BYTE *container, BYTE *flashPageBase)
{
// assumes prior saving and changing of flash data
BYTE i;

flashPageBase = (BYTE*)((WORD)(flashPageBase) & 0xFF80); // wrap around for flash page base address

_DINT();
flash_eraseFLASH(flashPageBase);

for(i=0;i<128;i++)
{
flash_writeByte(flashPageBase++,*(container++));
}
_EINT();
}

/*flash.h文件
+-------------------------------------------------------------------------------+
: copyright (c) Jean Randhahn    :
+-------------------------------------------------------------------------------+
: Project       : CANeye - Uni Rostock                                     :
: Compiler    : IAR workbench GUI 2.31E / target descriptor v1.26A/WIN    :
+-------------------------------------------------------------------------------+
:                                                                            :
: class : flash                                                    :
: File name    : flash.h                                                 :
: Target hardware : MSP430F148/9                                              :
:                                                                            :
: File Editor : J. Randhahn                                              :
: Created       : 06.08.2002                                              :
:                                                                            :
: Description :                                                          :
:                                                                         :
:                                                                         :
:                                                                :
:                                                                            :
+-------------------------------------------------------------------------------+
:                                                                            :
: Modification history:                                                       :
:                                                                            :
:                                                                            :
+-------------------------------------------------------------------------------+
*/
#ifndef __FLASH_H__
#define __FLASH_H__

#ifdef __FLASH__
/*::::::::::::::::::::::::: START OF LOCAL PART ::::::::::::::::::::::::::::::::*/
/*----------------------- LOCAL INCLUDES ---------------------------------------*/
#include <msp430x14x.h>
#include "type.h"

/*----------------------- LOCAL DEFINITIONS ------------------------------------*/

/*----------------------- LOCAL FUNCTION DECLARATIONS --------------------------*/
   void       flash_eraseFLASH(BYTE *seg);
   void       flash_writeWord(WORD *dst, WORD value);
   void       flash_writeByte(BYTE *dst, BYTE value);
   void       flash_saveInfoFlash(BYTE *container, BYTE *flashPage);
   void       flash_changeInfo(BYTE* containerBase, BYTE *pointer, BYTE value);
   void       flash_updateInfo(BYTE *container, BYTE *flashPageBase);

/*----------------------- LOCAL CONSTANTS AND VARIABLES ------------------------*/

/*----------------------- PUBLIC VARIABLES WITH INITIALISATION -----------------*/

/*::::::::::::::::::::::::: END OF LOCAL PART ::::::::::::::::::::::::::::::::::*/

#else
/*----------------------- PUBLIC VARIBALES INITIALIZED LOCALLY -----------------*/
#endif

/*-------------------- PUBLIC DEFINITIONS --------------------------------------*/

/*-------------------- PUBLIC CONSTANTS AND VARIABLES --------------------------*/

/*-------------------- PUBLIC FUNCTION DECLARATIONS ----------------------------*/
extern void       flash_eraseFLASH(BYTE *seg);
extern void       flash_writeWord(WORD *dst, WORD value);
extern void       flash_writeByte(BYTE *dst, BYTE value);
extern void       flash_saveInfoFlash(BYTE *container, BYTE *flashPage);
extern void       flash_changeInfo(BYTE* containerBase, BYTE *pointer, BYTE value);
extern void       flash_updateInfo(BYTE *container, BYTE *flashPageBase);
#endif

//type.h文件
/* START type definitions for convinience with microcontrollers ****************************/
typedef unsigned char BYTE;          /* 8 bits */
typedef unsigned short WORD;       /* 16 bits */
typedef unsigned long LONGWORD;    /* 32 bits */

/* for dividing a WORD into two BYTEs */
typedef union _WORD_BYTE
      { WORD w;
      BYTE b[2];
      } WORD_BYTE;

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