MSP430 Flash编程程序

//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) an