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nRF52 power draw with utility timer #1920

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gfwilliams opened this issue Aug 26, 2020 · 2 comments
Closed

nRF52 power draw with utility timer #1920

gfwilliams opened this issue Aug 26, 2020 · 2 comments

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@gfwilliams
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The utility timer uses TIMER1, and TIMER1 uses ~0.5mA when enabled

Often the utility timer is used for stuff that has to happen quickly and accurately (eg. Serial port emulation, digitalPulse) but there are times (eg. Bangle.js) when we use it just because we want something to run in an IRQ and don't care +/- 1ms when it runs.

It'd be nice if in these cases we could use the Nordic app_timer code used for setInterval/etc since this does still use IRQs, we just don't use them

I guess one option might be to allow Utility Timer tasks to be flagged with whether they need high precision or not, and if not they can be handled using app_timer?
gfwilliams added a commit that referenced this issue Aug 26, 2020
@gfwilliams
Bangle.js: Accelerometer poll handler now uses RTC app_timer, not TIM…
41b497e 
…ER1. 1mA->0.5mA standby current (ref #1920)
@gfwilliams
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Above changes just modify Bangle.js to use Nordic's native APP_TIMER, which takes the urgency off getting this done

@gfwilliams
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Mentioned in http://forum.espruino.com/conversations/352818

@espruino espruino deleted a comment from catch22out Aug 31, 2020
@gfwilliams gfwilliams closed this as not planned Won't fix, can't repro, duplicate, stale Feb 2, 2024
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@gfwilliams