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. The switching method adds judgment logic to the idle task body of the system: if the continuous running time of the idle task exceeds a specific value, it automatically enters the sleep mode ;The timer triggers interrupts to wake up the system at longer intervals, and completes several system Ticks at one time, so that all timing trigger tasks within a period of time can be completed in one wakeup, achieving "aligned wakeup". The invention enables the real-time operating system to have the ability to automatically enter and exit the low-power consumption mode. Compared with the Tickless strategy, the aligned wake-up strategy adopted by the real-time operating system executes tasks that need to be executed within a period of time in scenarios where real-time requirements are not strict. Time merging can minimize the number of wake-ups and reduce energy consumption.

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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