//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_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++;
}
}
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