Programmer for AT24C64

Most device programmers should do this. Assuming your 116 locations are fixed, you would be best to create a HEX file with _just_those_locations_.

Ask the factory for this file, if you are unsure how to create one :)

Then, your operation would be

- Install Device

- READ Device into programmer buffer

- Load FixFile.HEX - this should REPLACE.Merge just the 116 values. [ I think that is what you want, rather than a Logical OR ? ]

- PROGRAM the device.

That preserves the original EE contents, but replaces your FixUp values.

-jg

"James254" wrote in news:c71sme$hhp$ snipped-for-privacy@lust.ihug.co.nz:

Hi James,

If you can download a program through the serial port, wouldn't it be more convenient to download a tiny program to change those 116 locations without removing the EEPROM from the product? I'm assuming the product has in- circuit programming capabilities (for storing its gain setting etc) so you could even call the existing function rather than writing another in the downloaded app, minimising the transfer time over RS232.

Peter.

I would do one of the following things:

1. Enable device in which EEPROM is inside to program the EEPROM on PC request, and just those addresses you need

1. Make a device for programming EEPROMs from PC

Mickey

memory

by

setting

Hi Jim, CodeSprite & Mickey,

Thanks for taking the time to reply.

I should have made myself a little clearer in the original message. I only provide the support for the product (I don't have access to the code for the microcontroller, therefore there is no possibility of using the RS232 connector to change the EEPROM data. The factory will not release the information it's a secret!).

So the options left open to me are to make a device that programs the EEPROM when it's removed from the product. I think that I could do that using a PIC microcontroller but it'll take me some time as I've never written I2C code for this microcontroller.

I think Jim's idea about asking the factory write a .hex file that changes just the 116 locations is the best idea.

Is it possible to write a .hex file to change 116 non-sequential locations?

If so, I think that Ponyprog software and a "Easy I2C" programmer will do the job. What do you think?

Thanks in advance, James

PS. I'm open to suggestions if anyone has a better idea...

memory

by

setting

yes.

Hi Jim,

Should have been more elaborate :)

I think I can get the EEPROM address locations (I already know the data values) from the factory, but I'm not sure how I would go about writing the .hex file. If you can suggest a user friendly windows program that would do the job I would appreciate it!

Thanks > > Hi Jim, CodeSprite & Mickey,

locations?

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You did not specify a format, but from your extension it looks like you want Intel hex.

Intel hex:

Motorola-S:

You can write these file with any simple editor (like notepad) and a calculator. But maybe someone here can point you to a more user friendly editor for these files.

Use almost any assembler, and the ORG and DB commands therein eg ORG 1234H DB 55H ORG 4321H DB 0AAH

should ( after linking ) create a .HEX file with just those two bytes

-jg

If I were doing it, I would probably use an absolute assembler for some

Thad

Hi Jim and Thad,

Thanks for the clear suggestions. I've got no problems doing this; I understand what you are trying to get me to do. I would have never thought of doing it that way and it's something I won't forget.

Once again thanks for your help. James

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