Hi Peter,

The datasheet explains everything that one needs to generate a start
condition, the stop condition and the ack condition.... including the format
of the control  byte, the address bites and the actual data byte(s).

I have tried implementing this on both I2C using the PIC16F877 and
bit-banging using the same processor.

These are the conditions I have experienced so far.

- Everything goes through okay for one write and one read, but the character
read back is not the character I wrote. The returned character is either
00000000 or 11111111

- In the above case, all the ack's and stuff were there as they should have
been in the datasheet.

- Then, I have cases where the eeprom doesnt ack anything I send to it.

- I also have cases where it ack's a write, but not a read.

This is why I have asked for example code on performing this task since I am
obviously not getting something that is written in the datasheet.

It may be that my ASM coding is up to shit, or that I am making a stupid
mistake, but the bottom line is I need to be able to compare it to something
that works to see where I have made the mistake. This continious
re-programming and testing for the last week with failed results is
becomming a pain. Perhaps if you have fancy things like ICD 2 or so then
you'd be able to work things out, but without fancy equipment like the above
one is stuck to what one reads and interprets from the given information.

Any help would be appreciated.

Regards,
Andre Thomas




-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Peter Schultz
Sent: Sunday, June 15, 2003 8:09 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: PIC16F877 and 24LC256 EEPROM


Hi Andre,

The same combination is working perfectly for me, what is your exact
problem?

Peter Schultz

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