Method for reducing power consumption of embedded system

Abstract

The invention relates to a method for reducing the power consumption of an embedded system. Currently, the reduction of the power consumption of the embedded system only aims at a processor or a peripheral device, which causes the power consumption of the whole system not to be totally considered so that the effect of low power consumption is not obvious. The method comprises the concrete steps of: selecting operating frequency when a task begins to be executed first; calculating a value Usum (Usum=*Ui), wherein Ui=(ei+Tbe) / pi, Ui is task utilization rate of each task, ei is the longest execution time of the task of the processor under the highest frequency, Tbe is benefit damage balance time of the peripheral device, and pi is task period; comparing the Usum with 1 to decide whether the peripheral device is started; calculating the utilized frequency and selecting the operating frequency; selecting the operation frequency when the execution of the task is finished; and judging whether the next task needs to use the peripheral device, and wakening the peripheral device in advance if the next task needs to use the peripheral device. The method synchronously considers the power consumption of the processor and the peripheral device, and ensures that the effective energy supply rate of the embedded system is maximized, thereby prolonging the service life of batteries.

Description

technical field The invention belongs to the technical field of computers, and in particular relates to a method for reducing power consumption of an embedded system. Background technique In recent years, with the vigorous development of the semiconductor industry and the wide application of embedded systems, various portable electronic devices and mobile devices such as mobile phones, PDAs, and notebook computers have become popular consumer electronic products. Most of these portable electronic devices are embedded real-time systems, therefore, a highly integrated System-on-Chip (SOC) is mostly used as the processor core. These various electronic products fully display the embedded system and SOC technology. Their features are not only light and easy to carry, but also more and more diversified in function. For example, color LCD displays with backlighting, sound subsystems, camera functions, wireless local area networks (WLANs), Bluetooth (Bluetooth) and so on are conti...

AI Technical Summary

Problems solved by technology

However, the above-mentioned methods only focus on the energy management of the processor or peripheral devices, so that the power consumption of the entire system is not fully considered, so that the effect of low power consumption is not obvious

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