unsigned char WriteEEPROM(unsigned char *pData, unsigned char whichbutton)
{
unsigned char keys = 0;
unsigned char bytes = 0;
unsigned char counter = 0;
unsigned char returnvalue = 0;

for(keys = 0; keys < 32; keys++)
	{
	for(bytes = 0; bytes < 8; bytes++)
		{
		if(eeprom_read((keys * 8) + bytes) == 0xFF)
			counter++;
		}

	if(counter == 8) break;
	else counter = 0;
	}

for(bytes = 0; bytes < 8; bytes++)
	{
	if(bytes == 7) 
		{
		pData[bytes] &= 0xF0;									 // clear the last 4 bits of the last byte
		if(whichbutton == BUTTON_INPUT) pData[bytes] |= 0x0A;	 // set the last 4 bits to 1010
		else if(whichbutton == BUTTON_NEW) pData[bytes] |= 0x05; // set the last 4 bits to 0101
		}
	eeprom_write(((keys * 8) + bytes), pData[bytes]);
	}

if(counter == 8) returnvalue = 1;
	else returnvalue = 0;

return returnvalue;
}

unsigned char CheckEEPROM(unsigned char *pData)
{
unsigned char keys = 0;
unsigned char bytes = 0;
unsigned char counter = 0;
unsigned char returnvalue = 0;
unsigned char keytype = 0;

for(keys = 0; keys < 32; keys++)
	{
	for(bytes = 0; bytes < 8; bytes++)
		{
		if(eeprom_read((keys << 3) + bytes) == pData[bytes])
			{
			counter++;
			keytype = 0x0F & eprom_read((keys << 3) + bytes);	// store the value that was read
			}
		}

	if(counter == 8) break;
	else counter = 0;
	}

if((counter == CORRECT) && (keytype == 0x05)) returnvalue = 1;
if((counter == CORRECT) && (keytype == 0x0A)) returnvalue = 2;
	else returnvalue = 0;

return returnvalue;
}