Dynamic tick

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Dynamic tick

Robert Pomeroy 26

Does Azure ThreadX currently support dynamic tick for battery operated devices? If not, is it being planned?

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Scott Azure RTOS 4,051

We have some low power code coming out in our 6.1.5 release in a few days that does ThreadX timer management. This allows you to turn off the system tick driving ThreadX so you can put the processor to sleep or in some low power mode. Note that it is still up to you to manage your hardware timers.

Robert Pomeroy 26 Reputation points

2021-03-02T18:22:07.113+00:00

If I have a hardware timer to time the sleep time, will it be possible to update the tick time when I wake?
Scott Azure RTOS 4,051 Reputation points

2021-03-02T18:32:42.083+00:00
Absolutely! That's the primary logic of our low power code - you time how long you sleep using a low power hardware timer, and then upon waking up, there is an API to update all the ThreadX software timers.

What we imagine users doing for low power/sleep mode is:

determine if entering low power/sleep mode makes sense

use an API to get when the next ThreadX software timer expires

turn off the periodic hardware timer driving the ThreadX tick

start a low power timer, sleep until low power timer expires,

upon waking up, use API to adjust the ThreadX software timers

turn the periodic ThreadX timer back on.

Some of these steps are optional. For example, users may not care how long they sleep, or there may not be any ThreadX timers active, so users may want to sleep forever until some event happens (like a button press).
Robert Pomeroy 26 Reputation points

2021-03-02T19:34:51.657+00:00

Sounds like it's just what I need. I'll be looking for this update. Thanks

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