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Code to store tables in code memory

 
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future



Joined: 14 May 2004
Posts: 321

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Code to store tables in code memory
PostPosted: Sat Sep 25, 2004 8:20 pm     Reply with quote

I have this code that works fine with the internal eeprom, but I am limited to 256bytes. Once called it will store the entire struct into eeprom.

I am looking for a way to store this data (a struct) in flash memory.

Thank you.

Code:
#int_eeprom
void eeprom_isr(void) {
    //;==============================;//
    /*;  wr - write eeprom complete  ;*/
    //;==============================;//
        if(eecnt<sizeof(cfg)) {
            eeadr=eecnt;
            eedata=*(&cfg+eecnt);
            bit_clear(eecon1,eepgd);  // point to data memory
            bit_set(eecon1,wren);     // enable writes
            eecon2=0x55;              // write 55h
            eecon2=0xAA;              // write AAh
            bit_set(eecon1,wr);       // set wr to begin write
                eecnt++;              // increment index pointer
            } else {
               eecnt=0;
               disable_interrupts(int_eeprom);
        }
}
pirev



Joined: 19 Mar 2005
Posts: 13
Location: Bulgaria

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PostPosted: Fri Jun 24, 2005 5:48 pm     Reply with quote

Code:


// For PIC16F8xx

#bit _C=STATUS.0
#bit GIE=INTCON.7

#bit RD=EECON1.0
#bit WR=EECON1.1
#bit WREN=EECON1.2
#bit EEPGD=EECON1.7

#define _NOP() #asm nop #endasm

void WrPrgMem( int16 dst, int16 data )   {
   // Load destination address
   EEADR = (char)dst;
   EEADRH = 0x1F & ( dst >> 8 );
   // Load data to be programmed
   EEDATA = (char)data;
   EEDATH = data>>8;
   EEPGD = 1;      // Point to program memory location
   WREN = 1;      // Enable write to program memory
   if( GIE )
      _C = 1;
   GIE = 0;      // Disable interrupt
   EECON2 = 0x55; EECON2 = 0xAA;
   WR = 1;         // Start write operation
   _NOP(); _NOP();
   if( _C )
      GIE = 1;   // Enable interrupt
   while( WR );
   WREN = 0;
}

long RdPrgMem( long src )   {
   EEADR = (char)src;
   EEADRH = 0x1F & ( src >> 8 );
   EEPGD = 1;      // Point to program memory location
   RD = 1;
   _NOP(); _NOP();
   return (((long)EEDATH)<<8)|EEDATA;
}
}
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