How to maintain RTC on power down

Dear Support Team,

On our efusA9X board implementation we have applied battery supply (voltage level about 3.15V) on pin 9 of efusA9X, as suggested in hardware design guide. We still cannot get correct time after power restart. I mean, we set correct time and date using date/time commands, but after power restart, date is reset to Sunday, January 01, 2006. year.

Do we miss something some RTC related setting in the configuration, or a kind of forcing write to system clock?

Best regards,

Miodrag Bazdar

Hello,

Does ExternalRTC driver use I2C bus (and I2C driver) to write data to RTC chip ?

Best regards,

Miodrag Bazdar

And which I2C driver does it use, native or soft?

Dear Support Team,

I have disabled I2C drivers in our custom image, since we do not use I2C peripherals. That is the reason why RTC haven't kept the correct time. I have now enabled I2C bus drivers through Catalog items, and RTC started working.

Can you please confirm that we will still be able to use UART E when I2C is enabled, since UART E lines are shared with I2C?

Best regards,

Miodrag Bazdar

Hello,

Thanks for the help.

I have now enabled I2C bus drivers through Catalog items, and RTC started working.

Can you please confirm that we will still be able to use UART E when I2C is enabled, since UART E lines are shared with I2C?

Best regards,

Miodrag Bazdar

Hello,

I am concerned with lines 86 (UART E TX shared with I2C_B_IRQ) and 153 (UART E RTS shared with I2C_A_IRQ). If we keep I2C driver enabled, will it break UART E?

Best regards,

Miodrag Bazdar

Great, thanks for the help!

Best regards,

Miodrag Bazdar