Realization method of dynamic duration timer without accumulative error beneficial to low power consumption

Abstract

The invention relates to a method for realizing a dynamic duration timer without accumulative error which is beneficial to low power consumption. It is characterized in that the relative time unit is the elapsed time from the start of the system to the present; the time interrupt service unit is responsible for updating the running time of the software timer, and according to the latest software timer overtime, the next hardware clock source interrupt generation time is set, and at the same time Activate the timer processing task unit; the timer processing task unit judges whether the software timer node has reached the timing time according to the current relative time unit time, and when the timer expires, execute the timer expiration processing method of the predetermined processing unit, and judge whether it is a cycle according to the timer type The timer or the acyclic timer performs related operations; the timer management unit is responsible for related initialization and insertion and deletion of timer nodes. The invention avoids time deviation and accumulative error caused by CPU executing interrupt service program, and realizes dynamic variable-length timing to reduce power consumption.

Description

Technical field [0001] The invention relates to a realization method of a dynamic duration timer with no accumulated error which is beneficial to low power consumption. Background technique [0002] There are many applications in embedded development that need to use timing functions, but the number of timers provided by hardware devices is far from meeting business needs. For example, the need for periodic access to peripheral devices is generally polled. For periodic acquisition, the traditional implementation scheme is to use the timer provided by the system and adopt a cyclic timing query method. Under the traditional scheme, it will not be conducive to the realization of low power consumption of the system, and will also cause huge pressure on hardware timer resources. Using this method not only wastes system resources, but also makes it difficult to put the embedded device into a good hibernation as a whole, which leads to waste of power consumption and increases the cost ...

AI Technical Summary

Problems solved by technology

Causes periodic interrupts to the CPU with a low hit rate for valid software timers

Affect system performance, cannot make CPU enter low power consumption

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