Low power consumption mode switching method of embedded real time operating system

Abstract

The invention discloses a low power consumption mode switching method of an embedded real time operating system. According to the method, judgment logic is added in the built-in idle task body of the system. The judgment logic comprises following steps of automatically entering into a sleep mode if continuous operation time of entering into an idle task exceeds a specific value; trigging an interruption waking system by a timer according to a relatively long time interval; finishing a plurality of times of system tick all at once; and waking all timed triggering tasks in a time period all at once, thus realizing aligned waking. According to the method, the real time operating system is enabled to have the capability of automatically entering into and withdrawing from the low power consumption mode. Compared with a Tickless strategy, the aligned waking strategy has the advantages that the execution time of the tasks needing to be executed in a time period is combined in a scene without a strict timeliness demand, therefore the waking times can be reduced to a greater extent, and the energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of computers, and in particular relates to a low-power consumption mode switching method of an embedded real-time operating system. Background technique [0002] In the use of microcontrollers, power management is often used to reduce chip energy consumption. When the real-time operating system is introduced on the microcontroller, the power management becomes complicated, especially the interference of the real-time operating system Tick to the sleep mode. [0003] System Tick is the interface between the real-time clock and the operating system. The time-related modules and API (application programming interface) of the operating system are basically based on Tick. Tick is the smallest timing unit of the operating system. In the embedded real-time operating system, the timer module adopts a two-level timer mechanism: counter Counter and timer Alarm. The main purpose is to solve the problem that multiple a...

AI Technical Summary

Problems solved by technology

In order to solve this technical problem, real-time operating systems such as FreeRTOS and MQX use the Tickless method to reduce the impact of wake-up interference, that is, before entering the sleep state, first calculate the time interval for the latest wake-up, and set the timer in this time period after triggering the interrupt to avoid invalid wake-ups such as figure 1 shown; but the Tickless strategy in the scenario where the real-time requirements are not strict, the scattered execution tasks for a period of time still make the system need to be woken up frequently

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