RTC overview: Difference between revisions

Revision as of 13:59, 26 October 2023↑

Applicable for

STM32MP13x lines, STM32MP15x lines, Unknown MPU

This article gives information about the Linux^® RTC framework. The RTC framework is involved in precise time countdown.

The RTC keeps the system time up-to-date and can wake up the system from the standby power mode at a programmed time.

A general presentation of the RTC framework is available in the Linux RTC documentation ^[1].

RTC dedicated hardware block in STM32MPU product.

RTC ST driver.

Linux RTC framework, it provides API to RTC driver and interfaces to user.

Sysfs interface is accessible via /sys/class/rtc/rtcX/.

Procfs interface is accessible via /proc/driver/rtc.

Device interface is accessible via /dev/rtcX.

The user application can be a user built application or an community application such as hwclock.

API is described in Linux RTC documentation ^[1].

Activate rtc-stm32 driver in kernel configuration using the Linux Menuconfig tool: Menuconfig or how to configure kernel

Device drivers  --->
    -*- Real Time Clock  --->
        <*> STM32 RTC

Dynamic debug traces can be added using the following command:

echo -n 'file rtc-stm32.c +p'>/sys/kernel/debug/dynamic_debug/control

@@ Line 1: / Line 1: @@
-<noinclude>{{ApplicableFor
+{{ApplicableFor
-|MPUs list=STM32MP13x, STM32MP15x
+|MPUs list=STM32MP13x, STM32MP15x, STM32MP25x
-|MPUs checklist=STM32MP13x,STM32MP15x
+|MPUs checklist=STM32MP13x, STM32MP15x, STM32MP25x
-}}</noinclude>
+}}
+<noinclude></noinclude>
 This article gives information about the Linux<sup>&reg;</sup> RTC framework. The RTC framework is involved in precise time countdown.