I2CWRITE on a 24LC512

[GioppY]

Perhaps you forget "DEFINE I2C_SLOW 1"
Ciao

[Dave]

oslinux, You don't need the "DEFINE I2C_SLOW 1" statement as the normal speed of this EEPROM is 400Khz.

Dave Purola,
N8NTA

[oslinux]

No way, it's always writing the 90% (or less) of what it should...

[Dave]

oslinux, Try replacing the 4.7k pullups with 2.2k. Also, what are you doing with A0,A1, and A2 hardware address pins?

Dave Purola,
N8NTA

[oslinux]

A0, A1, A2 and WP are grounded, same problem with the 2.2K resistors, only some address are writed.

[skimask]

A0, A1, A2 and WP are grounded, same problem with the 2.2K resistors, only some address are writed.

Can you get rid of the 24LC512 and try a 24LC256 instead, or at least a smaller eeprom chip?

Not that it would make a difference...but it might...ya never know.
Only reason I mention it is because lots of people have used (are using) the '256, don't think I've heard of anybody using a '512 yet. They are a bit on the new-ish side (2-3 years old I'd guess, maybe...maybe not).

Also, try writing the whole eeprom, start to finish, try all $00's, try all $ff's, try a few things in between. There will probably be some sort of failure pattern in the eeprom readback itself that we might be able to see from a dump from the chip that'll narrow down the problem.

[oslinux]

Tried with the 256, and it does the same, i mean it does not write everything, anyway i have to use a 512, and when i will get my sample from microchip i will test the 1025, that's because i need more than 256k :S

Note that the 64 do the same thing...

Now i've put the whole thing in PROTEUS ISIS and i'v having the same problem, but i can see the log of the eeprom:

212.727201m [RX_CMD     ]: Command received: 0xA0 (0b10100000). Device=0, Block=0x00, Address=0x0006 RD/WR=Write.
223.593601m [RX_CMD     ]: Command received: 0xA0 (0b10100000). Device=0, Block=0x00, Address=0x0007 RD/WR=Write.
234.460001m [RX_CMD     ]: Command received: 0xA0 (0b10100000). Device=0, Block=0x00, Address=0x0008 RD/WR=Write.
245.326801m [RX_CMD     ]: Command received: 0xA0 (0b10100000). Device=0, Block=0x00, Address=0x0009 RD/WR=Write.
256.192801m [RX_CMD     ]: Command received: 0xA0 (0b10100000). Device=0, Block=0x00, Address=0x000A RD/WR=Write.

Until Here it's all good, but...

256.708801m [RX_CMD     ]: Command received: 0xEE (0b11101110). Device=7, Block=0x00, Address=0x0009 RD/WR=Write.
256.708801m [RX_CMD     ]: Unknown command value (0xEE) received - command is ignored.

266.934401m [RX_CMD     ]: Command received: 0xA0 (0b10100000). Device=0, Block=0x00, Address=0x0009 RD/WR=Write.
267.134001m [RX_CMD     ]: Command received: 0x0A (0b00001010). Device=5, Block=0x00, Address=0x0026 RD/WR=Write.
267.134001m [RX_CMD     ]: Unknown command value (0x0A) received - command is ignored.

277.362001m [RX_CMD     ]: Command received: 0xEE (0b11101110). Device=7, Block=0x00, Address=0x0026 RD/WR=Write.
277.362001m [RX_CMD     ]: Unknown command value (0xEE) received - command is ignored.

Here it comes, it can't recognize the commands because for example, instead of receive this control byte:
0b10100000

it receive this:
0b00001010
or this:
0b11101110

it's like there's something missing, the eeprom don't receive the whole bytes, maybe the 10MHz OSC is not good?

Thx...

Luca