Difference between revisions of "ETRA SOM/ETRA Evaluation Kit/Interfaces and Connectors/RTC"
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! colspan="4" style="width:100%; text-align:left" ; border-bottom:solid 2px #ededed" |History | ! colspan="4" style="width:100%; text-align:left" ; border-bottom:solid 2px #ededed" |History | ||
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! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Issue Date | ! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Issue Date | ||
! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Notes | ! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Notes | ||
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| − | | style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" | | + | | style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |2021/01/14 |
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| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |First Release | | style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |First Release | ||
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Both RTC can retain time and custom data over blackouts using a backup power source as: | Both RTC can retain time and custom data over blackouts using a backup power source as: | ||
| − | * the lithium rechargeable battery (BT1) | + | * the lithium rechargeable battery (BT1) ''optionally'' mounted on the carrier board |
* an external battery connected to J3 (alternate mounting option to the battery) | * an external battery connected to J3 (alternate mounting option to the battery) | ||
| − | [[File: | + | [[File:ETRA-EVK-BT1-battery-connector.png|thumb|center|300px|BT1 or connector battery options]] |
===Signals === | ===Signals === | ||
| Line 42: | Line 40: | ||
| VBAT | | VBAT | ||
| | | | ||
| − | | can be configured for | + | | can be configured for battery connection |
|- | |- | ||
| 2 | | 2 | ||
Latest revision as of 16:13, 6 September 2023
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| History | |||
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| 2021/01/14 | First Release | ||
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 | |
| 2 | - | DGND | Ground |
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 date and hwclock linux commands.
