I2C with EEPROM using Angstrom OS

Sakthivel R

Dear sir,

We have used AT24C512 EEPROM for writing and reading, by giving " i2cdetect -y -r 3 " EEPROM device is detected at the address 0x50. While writing at 0x00 address of EEPROM, the value at 0x00 address is not updated and we are getting 0xff in all address locations of EEPROM. what is the mistake here ?

Thank you,

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

What is the state of the EEPROM write-protect pin?

0 Sakthivel R over 10 years ago in reply to Biser Gatchev-XID

Intellectual 395 points

Active low state...

0 Biser Gatchev-XID over 10 years ago in reply to Sakthivel R

TI__Guru**** 393215 points

Do you try to write from U-boot or kernel? Can you post the command you use?

0 Sakthivel R over 10 years ago in reply to Biser Gatchev-XID

Intellectual 395 points

We are using these commands for
writing - " i2cset -y -r 3 0x50 0x00 0x12" and
reading - " i2cget -y -r 3 0x50 0x00"

Thank you,

0 Ivan Matrakov over 10 years ago in reply to Sakthivel R

TI__Expert 4475 points

Hi ,

Are you sure that i2cget/set commands return valid value, because -r is not valid options. Could you try to specify read/write data to byte with 'b' options as:
"i2cset -y 3 0x50 0x00 0x12 b"
"i2cget -y 3 0x50 0x00 b"

BR
Ivan

0 Sakthivel R over 10 years ago in reply to Ivan Matrakov

Intellectual 395 points

Hi,

we have tried that, but while reading still we are getting 0xff only..... in Angstrom is there any write restriction in between 0x30___0x37.... & 0x50 ___ 0x5f...... ?

Thank you,

0 Biser Gatchev-XID over 10 years ago in reply to Sakthivel R

TI__Guru**** 393215 points

The Angstrom build is supported by the community at: http://beagleboard.org/Community/Forums This forum supports only the TI distributed Linux EZSDK.

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I2C with EEPROM using Angstrom OS