[SOLVED] problem with the eeprom 24cxx

[Th3r4p1sT]

Hi all!
i am using 24c02 in my project. and i have a reading problem.

for example
i send some different bytes to eeprom and read them back.

when i watch the transfer in isis i2c debugger,

whatever i sent, i always read the one that i last sent.

im sending a picture of debugging screen



How/why can this happen? please help me about this.
Thank you!

 

[FvM]

I see, that you have a stop start sequence between address write and data read. The datasheets requests a repeated start instead. Even if it isn't a problem with the real chip (I don't actually know), it may be a problem for Proteus.

 

[Th3r4p1sT]

hello again,

after i wrote my problem here, i had an idea and tried it.

so i solve this problem.

here;
i have changed the 24c02 eeprom with a 24c32 eeprom. and the codes worked.

So, i understood that i was sending the address data as a word (example: 0x0010)

After that, i corrected my codes and i sent the address data as a byte (example: 0xff). and changed the eeprom with 24c02 .
And the codes worked.

So, we understood that if our eeprom includes 256x8 bit, we must not use word address.

See you!

 

[manoharn]

hai i am doing project using pic18f458 and eeprom 24c02 & i done read write operations correctly but its memory is only 256 bytes , i need memory more than this so i choose eeprom 24c32.

In 24c02 i am writing only "one 8bit" data but in 24c32 i need to write "two 8bit" data,so i need to know how to write two 8 bit data.


ex:for 24c02
let m3=10;//memory location
i2c_eeprom_write(m3,0,dat[0]);
m3=m3+2;
whatever data in the dat[0] its writing in memory location m3 i.e 10 and i don't know o in above i2c_eeprom_write instruction ,in eeprom.c its given like i2c_eeprom_write(unsigned long int addrh,unsigned char addrl,unsigned char data)