flash.c

MSP430电能测量程序,用的是电力线载波通讯.即PLC

//--------------------------------------------------------------------------
//
//  Software for MSP430 based e-meters.
//
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//
//	File: flash.c
//
//  Steve Underwood <[e-mail]>
//  Texas Instruments Hong Kong Ltd.
//
//  Date        Comments
//  =====================
//	2002-09-16	SU	Initial version
//  2004-01-14  HEM Combined all flash functions into one big file.
//					Made all flash_write_ functions into calls to flash_memcpy().
//					Made all of the flash_replace functions into calls to flash_replace_block().
//					Made two versions of flash_replace_block; one with workaround 
//					 for FLASH mirroring bug in early FE427 parts.
//
//--------------------------------------------------------------------------
//#include <signal.h>
//#include <stdint.h>
//#include "emeter-toolkit-custom.h"
#include "emeter-toolkit.h"

//#if defined(__MSP430__)
#define FSEG_A 0x01080    	// Flash Segment A start address
#define FSEG_B 0x01000    	// Flash Segment B start address

//--------------------------------------------------------------------------
void flash_clr(int *ptr)
{
  	_DINT();
  	FCTL3 = 0x0A500;          			/* Lock = 0 */
  	FCTL1 = 0x0A502;          			/* Erase = 1 */
  	*((int *) ptr) = 0;       			/* Erase flash segment */
	_EINT();
}

//--------------------------------------------------------------------------
void flash_secure(void)
{
  	_DINT();
  	FCTL1 = 0x0A500;          			/* Erase, write = 0 */
  	FCTL3 = 0x0A510;          			/* Lock = 1 */
	_EINT();
}


//--------------------------------------------------------------------------
void flash_memcpy(char *ptr, char *from, int len)
{
  	_DINT();
  	FCTL3 = 0x0A500;          			/* Lock = 0 */
  	FCTL1 = 0x0A540;          			/* Write = 1 */
	while (len)
	{
	  	*ptr++ = *from++;
	  	len--;
	}
  	flash_secure();
  	_EINT();
}

//--------------------------------------------------------------------------
void flash_write_int8(int8_t *ptr, int8_t value)
{
	flash_memcpy((char*)ptr, (char*)&value, sizeof(value));
}

//--------------------------------------------------------------------------
void flash_write_int16(int16_t *ptr, int16_t value)
{
	flash_memcpy((char*)ptr, (char*)&value, sizeof(value));
}

//--------------------------------------------------------------------------
void flash_write_int32(int32_t *ptr, int32_t value)
{
	flash_memcpy((char*)ptr, (char*)&value, sizeof(value));
}



#define FLASH_MIRRORED 1
#if FLASH_MIRRORED		
// ***********************************************************************
//  This routine makes the flash looks like EEPROM. It will erase and
//  replace a contiguous block of memory.  
//  This routine copies the flash to RAM, erases the FLASH, and copies
//  all 128 bytes from RAM back to FLASH, xcept the ones to be replaced.
// ***********************************************************************
void flash_replace_block(char* dest, char* src, unsigned int count)
{
  	char* read_ptr;
  	char* write_ptr;
  	int w;
	char ramcopy[128];		// Temporary RAM copy of pre-existing FLASH
  
  	_DINT();
    //Copy block B to RAM
  	read_ptr = (char*) FSEG_B;
  	write_ptr = &ramcopy[0];
  	for (w = 0;  w < 128;  w++)
    	*write_ptr++ = *read_ptr++;
	
	// Erase the FLASH
  	flash_clr((int *) FSEG_B);

    //Set to write mode to prepare for copy
  	FCTL3 = 0x0A500;          /* Lock = 0 */
  	FCTL1 = 0x0A540;          /* WRT = 1 */

    //Copy from RAM to FLASH_B, slipping in the new values at the right locations
  	read_ptr = &ramcopy[0];
  	write_ptr = (char*) FSEG_B;
  	for (w = 0;  w < 128;  w++, read_ptr++, write_ptr++)
  	{
    	if (  (write_ptr >= dest) &&(write_ptr < (dest+count)))
      		*write_ptr = *src++;
    	else
      		*write_ptr = *read_ptr;
  	}
  	flash_secure();
  	_EINT();
}	
#else	
// ***********************************************************************
//  This routine makes the flash looks like EEPROM. It will erase and
//  replace a contiguous block of memory.  
//  This routine will erase SEGA and then image SEGB to SEGA
//  It will then erase SEGB and copy from SEGA back to SEGB all 128 bytes
//  except the ones to be replaced.
// ***********************************************************************
void flash_replace_block(char *dest, char *src, unsigned int count)
{
  	char *read_ptr;
  	char *write_ptr;
  	int w;
  
  	flash_clr((int *) FSEG_A);

  	_DINT();
    //Set to write mode to prepare for copy
  	FCTL3 = 0x0A500;          /* Lock = 0 */
  	FCTL1 = 0x0A540;          /* WRT = 1 */

    //Copy block B to A
  	read_ptr = (char *) FSEG_B;
  	write_ptr = (char *) FSEG_A;
  	for (w = 0;  w < 128;  w++)
    	*write_ptr++ = *read_ptr++;
  	flash_clr((int *) FSEG_B);

    //Set to write mode to prepare for copy
  	FCTL3 = 0x0A500;          /* Lock = 0 */
  	FCTL1 = 0x0A540;          /* WRT = 1 */

    //Copy block A to B, slipping in the new values at the right locations
  	read_ptr = (char *) FSEG_A;
  	write_ptr = (char *) FSEG_B;
  	for (w = 0;  w < 128;  w++, read_ptr++, write_ptr++)
  	{
    	if (  (write_ptr >= dest) &&(write_ptr < (dest+count)))
      		*write_ptr = *src++;
    	else
      		*write_ptr = *read_ptr;
  	}
  	flash_secure();
  	_EINT();
}
#endif // FLASH_MIRRORED


void flash_replace8(int8_t *ptr, int8_t word)
{
	flash_replace_block((char*)ptr, (char*)&word, sizeof(word));
}

void flash_replace16(int16_t *ptr, int16_t word)
{
	flash_replace_block((char*)ptr, (char*)&word, sizeof(word));
}

void flash_replace32(int32_t *ptr, int32_t word)
{
	flash_replace_block((char*)ptr, (char*)&word, sizeof(word));
}




//#endif