Set & Read Date and Time from RTC-I2C

Tapas Maji

I have a custom AM3354 board .External RTC M41ST85WMH6F is connected  via i2c interface.
I want to read time & date from RTC-i2c.I want to set date and time to RTC also.

U-Boot# i2c probe
Valid chip addresses: 40 68
U-Boot# date
Unknown command 'date' - try 'help'
U-Boot# date 271111112014.5
Unknown command 'date' - try 'help'

How to do it?
I am attaching RTC datasheet herewith.

M41ST85WMH6F.pdf

over 11 years ago

0 Biser Gatchev-XID over 11 years ago

TI__Guru**** 393215 points

Hi,

I will forward this to the SW team.

0 Ivan Matrakov over 11 years ago in reply to Biser Gatchev-XID

TI__Expert 4475 points

Hi,

Your RTC is connected via i2c interface. This mean that you have to get/set time from/to RTC via I2C interface, not with Linux date/time commands. You can get/set the RTC via console with a i2cget/i2cset commands. See also i2cdump and i2cdetect commands.

BR
Ivan

0 Tapas Maji over 11 years ago in reply to Ivan Matrakov

Prodigy 190 points

Thanks Ivan,

I'm able to read and write the RTC device in UBoot now after few tweaks.

As said i have to use it in LINUX kernel and i'll update the outcome.

regards,
Tapas Maji

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Set & Read Date and Time from RTC-I2C