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There are 1 incomplete or pending task to finish installation of Semantic MediaWiki. An administrator or user with sufficient rights can complete it. This should be done before adding new data to avoid inconsistencies.This article gives information about the Linux® RTC framework. The RTC framework is involved in precise time countdown.
1. Framework purpose[edit source]
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].
2. System overview[edit source]
2.1. Component description[edit source]
- RTC (hardware)
- RTC dedicated hardware block in STM32MPU product.
- rtc-stm32
- RTC ST driver.
- rtc
- Linux RTC framework, it provides API to RTC driver and interfaces to user.
- Sysfs interface
- Sysfs interface is accessible via /sys/class/rtc/rtcX/.
- Procfs interface
- Procfs interface is accessible via /proc/driver/rtc.
- Char device interface
- Device interface is accessible via /dev/rtcX.
- User application
- The user application can be a user built application or an community application such as hwclock.
2.2. API description[edit source]
API is described in Linux RTC documentation [1].
3. Configuration[edit source]
3.1. Kernel configuration[edit source]
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
3.2. Device tree configuration[edit source]
Refer to the RTC device tree configuration.
4. How to use the framework[edit source]
Refer to the How to use the RTC.
5. How to trace and debug the framework[edit source]
5.1. How to trace[edit source]
Dynamic debug traces can be added using the following command:
echo -n 'file rtc-stm32.c +p'>/sys/kernel/debug/dynamic_debug/control
6. Source code location[edit source]
- rtc-stm32: drivers/rtc/rtc-stm32.c
- api: include/linux/rtc.h
- framework:
- device-tree bindings constants: include/dt-bindings/rtc/rtc-stm32.h
7. References[edit source]