flash.c

来自「基于MSP430的电表终端上的CT检测程序」· C语言 代码 · 共 57 行

#include  <msp430x13x.h>

unsigned int flash_data_buff[10];
void  write_flash ();
void  read_flash (void);
void flash_init(void);
extern void clr_wdt(void);            //复位看门狗

void flash_init(void)
{
  WDTCTL = WDTPW + WDTHOLD;       // Stop watchdog timer
  FCTL2 = FWKEY + FSSEL0 + FN0;   // MCLK/2 for Flash Timing Generator
}

void write_flash (void)
{ unsigned char temp3;
  unsigned int  temp;
  unsigned char temp2;
  unsigned char *Flash_ptr;                // Flash pointer
  unsigned char i;
  Flash_ptr = (unsigned char *) 0x1000;    // Initialize Flash pointer
  FCTL1 = FWKEY + ERASE;          // Set Erase bit
  FCTL3 = FWKEY;                  // Clear Lock bit
  *Flash_ptr = 0;                 // Dummy write to erase Flash segment
  FCTL1 = FWKEY + WRT;            // Set WRT bit for write operation
  for (i=0; i<10; i++)
  { clr_wdt();
    temp=flash_data_buff[i];
    temp3=temp;
    temp2=(temp>>8);
    *Flash_ptr++ = temp2;         // Write value to flash
    *Flash_ptr++ = temp3;         // Write value to flash
  }
  FCTL1 = FWKEY;                  // Clear WRT bit
  FCTL3 = FWKEY + LOCK;           // Reset LOCK bit
}

void read_flash (void)
{
  unsigned int temp1,temp2;
  char *Flash_ptrA;               // Segment A pointer
  unsigned int i;
  Flash_ptrA = (char *) 0x1000;   // Initialize Flash segment A pointer
  FCTL1 = FWKEY + ERASE;          // Set Erase bit
  FCTL3 = FWKEY;                  // Clear Lock bit
  FCTL1 = FWKEY + WRT;            // Set WRT bit for write operation
  for (i=0; i<10; i++)
  { temp1= *Flash_ptrA++; // copy value segment A to segment B
    temp2= *Flash_ptrA++; // copy value segment A to segment B
    flash_data_buff[i] = (temp2+(temp1<<8));
    clr_wdt();
  }
  FCTL1 = FWKEY;                  // Clear WRT bit
  FCTL3 = FWKEY + LOCK;           // Reset LOCK bit
}