ETRA SBC/Interfaces and Connectors/RTC
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RTC device[edit | edit source]
Description[edit | edit source]
There are two RTC devices on the Evaluation Kit, one is provided by the STM32MP1 SoC, the other is a Maxim DS3232M I2C device.
Both RTC can retain time and custom data over blackouts using a backup power source as:
- the lithium rechargeable battery (BT1) optionally mounted on the carrier board
- an external battery connected to J3 (alternate mounting option to the battery)
Signals[edit | edit source]
The following table describes the interface signals for J3:
|Pin#||SOM Pin#||Pin name||Pin function||Pin Notes|
|1||J18.14||VBAT||can be configured for battery connection|
Device mapping[edit | edit source]
RTC is mapped to
/dev/rtc0 device in Linux.
Device usage[edit | edit source]
The peripheral can be accessed through the
hwclock linux commands.