Naked LGT8F328 crashes when writing to EEPROM

[alxgarza]

I am trying to program a LGT8F328 with bare minimum code. No Arduino libraries.
I got everything working except EEPROM write.
Whenever I write to EEPROM the LGT8F328 hangs.

This is the function I am using to write one byte to EEPROM:

void DrvEEPROM_Init(void)
{
ECCR = (1 << EWEN); // 0x80
ECCR = (1 << EEN) | (1 << CP1) | (1 << CP0); //0x4C
}

void DrvEEPROM_ProgByte(uint16_t u16Addr, uint8_t u8Data){
uint8_t __bk_sreg = SREG;

cli();

/* Wait for completion of previous write */
while(EECR & (1<<EEPE))

// address
EEARH = u16Addr >> 8;
EEARL = (u16Addr) & 0xff;

// data
EEDR = u8Data;
 
/* Write logical one to EEMPE */
EECR2 = (1<<EEMPE); // 0x04

/* Start eeprom write by setting EEPE */
EECR2 = (1<<EEPE);  // 0x02        CODE STOPS EXECUTION HERE!!!!!!!!!!

asm("nop");
asm("nop");

SREG = __bk_sreg;

}

Any idea what I am missing?

[alxgarza]

Forgot to comment,
EECR2 = EECR (They have the same definition)

[vklimk]

Ensure that system clock required for eeprom operations is configured and started.

[alxgarza]

You nailed it!
You need to have the internal RC clock enabled for EEPROM to work. Since I use an external crystal, I did not have the internal clock enabled.

Thanks.

[LaZsolt]

LGT8F328P ha no EEPROM. You could store data in a small part of the program flash with hardware / software emulated EEPROM functions.
You could rewrite those bytes which was empty (0xFF) before. If you want to rewrite the same byte you need to clear 1 KB program flash first.
This procedure is so complex that it is recommended to use the LGT EEPROM library.