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Contents
RTC deviceEdit
DescriptionEdit
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) that is mounted on the carrier board.
- an external battery connected to J3 (alternate mounting option to the battery)
[[File:{Template:Nome-som-EVB-RTC-connector.png|thumb|center|500px|RTC connector]]
SignalsEdit
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 recharge | |
| 2 | - | DGND | Ground |
Device mappingEdit
RTC is mapped to /dev/rtc0 device in Linux.
Device usageEdit
The peripheral can be accessed through the date and hwclock linux commands.