pic18f4620 eeprom

MIOS programming (C)
1

Hey Guys!

I’m trying to read and write to the internal eeprom of a pic18f4620

I seem to be only able to access the first 256 bytes

Basic run down:

Init -

for (i=0;i<0x100;i++) MIOS_EEPROM_Write(i, 0x41); // letter A

for (i=0;i<0x100;i++) MIOS_EEPROM_Write(i + 0x100, 0x42); // letter B

for (i=0;i<0x100;i++) MIOS_EEPROM_Write(i + 0x200, 0x43); // letter C

display_tick

MIOS_LCD_CursorSet(0x00);

for (i=0;i<0xf;i++) MIOS_EEPROM_Read(i);

Shows CCCCCCCCCCCCCCCC I expected AAAAAAAAAAAAAAAA also

display_tick

MIOS_LCD_CursorSet(0x00);

for (i=0;i<0xf;i++) MIOS_EEPROM_Read(i + 0x100);

also shows CCCCCCCCCCCCCCCC

Is there an issue thats not letting me go over address over 256?.. or more likely - am I just a retard

2

got it going

unsigned int extended_MIOS_EEPROM_Read(unsigned int address)

{

  EEADRH = address >> 8; // set eeprom address high byte

  return MIOS_EEPROM_Read(address & 0xFF);

}


void extended_MIOS_EEPROM_Read(unsigned int address, unsigned char data)

{

  EEADRH = address >> 8; // set eeprom address high byte

  MIOS_EEPROM_Write(address & 0xFF, data);

}