Saving RFID Data

[skimask]

Hi,
I search the Best way to save RFID Data !
Did some one have experience what I should use EEprom or something else.
I Try with 24C08 but the problem is that I have a adress byte but how this can work when I go for example to adress 512 this is more then a byte.
Adress var byte
Adress = 512 but this is not byte anymore
I2CWrite sda,scl,%10101000,Adress,[$00,$16,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$0 0,$00,$00,$00]
Thanks for any example.
Regards Pesti

Then I suppose your address might magically become a WORD just like the good book says in the I2CWrite section...and I quote:

The Address size sent (byte or word) is determined by the size of the variable that is used. If a byte-sized variable is used for the Address, an 8-bit address is sent. If a word-sized variable is used, a 16-bit address is sent. Be sure to use the proper sized variable for the device you wish to communicate with. Constants should not be used for the Address as the size can vary dependent on the size of the constant. Also, expressions should not be used as they can cause an improper Address size to be sent.

[Pesticida]

Hi,

Thank you !
I understand what you mean but on the PDF File for the 24C08 they says that the adress is just a byte and not a word.

Now my question is how can I write for example on adress 512 or 700 when I can just use a byte adress and not a word.

For the 24c02 and 24c01 I dont have Problems but when I need more then 256 bytes I can not read or write.
Can I use this I2CWrite sda,scl,$A9,here >512<here,[Tmp_Data]

Thanks

Regards Pesti

[Pesticida]

Ok!

I found that the 24C08 have 2 Blocks but thats mean that each block have 512 Bytes!
how can I read or write the first block or the second!?

I have just a byte adress!

regards Pesti

[skimask]

Ok!
I found that the 24C08 have 2 Blocks but thats mean that each block have 512 Bytes!
how can I read or write the first block or the second!?
I have just a byte adress!
regards Pesti

Now the answer you want is in the I2CREAD section instead of the I2CWRITE, which, incidentally, goes hand in hand with I2CREAD, because to I2CREAD something, first you have to I2CWRITE something, unless you would rather I2CREAD an empty chip, which isn't really empty, but full of no data, and sometimes no data is better than some data, either of which can be I2CREAD quite effectively, and either of which can be I2CWRITTEN over to replace either the no data or the some data which will be I2CREAD later on.

[Pesticida]

Thats mean i must use something like this:

EraseEEprom= $A8
EEprom_Block = 0
Tmp_Daten = $00

EraseEEprom:
Erase_Loop:
for NextAdr = 0 to 255
I2CWrite sda,scl,EEprom_Adresse,NextAdr,[Tmp_Daten]
pause 10
Sound Buzzer,[122,1]
next NextAdr
EEprom_Adresse = EEprom_Adresse + 2
EEprom_Block = EEprom_Block + 1
if EEprom_Block => 4 then EEprom_Block = 0 : goto Exit_Loop2
goto Erase_Loop
Exit_Loop2:
Sound Buzzer,[122,250]
goto Main


Regards pesti

[skimask]

Make it easy on yourself, get a 24C256, 32k x 8 eeprom. Word address, byte data

I2Cwrite datapin, clockpin, $a0, address, data

But if you're hellbent on using the 24c08...

address var word 'only use lower 10 bit
addr var byte
control var byte

addr = address.lowbyte
control = $a0 + ( address.highbyte << 2 )
i2cwrite datapin, clockpin, control, address, data-whatever

[Pesticida]

OK,

I must write this :
Control = $A1
For address = 0 to 1023
addr = address.lowbyte
control = $a0 + ( address.highbyte << 2 )
I2CRead sda, scl,Control, addr,[EEprom_Daten[Byte_Count]]
Pause 10
Byte_Count = Byte_Count + 1
if Byte_Count > 15 then
Byte_Count = 0
HSEROUT [DEC3 NextAdr-15, ": ",HEX2 EEprom_Daten[0],HEX2 EEprom_Daten[1],HEX2 EEprom_Daten[2],HEX2 EEprom_Daten[3],HEX2 EEprom_Daten[4],HEX2 EEprom_Daten[5],HEX2 EEprom_Daten[6],HEX2 EEprom_Daten[7],DEC2 EEprom_Daten[8],DEC2 EEprom_Daten[9],DEC2 EEprom_Daten[10],DEC2 EEprom_Daten[11],DEC2 EEprom_Daten[12],DEC2 EEprom_Daten[13],HEX2 EEprom_Daten[14],HEX2 EEprom_Daten[15],13,10]
endif
next address

Or I make again a mistake ?!

Regards Pesti