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Bangle.js screen flicker regression #1925

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gfwilliams opened this issue Sep 4, 2020 · 2 comments
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Bangle.js screen flicker regression #1925

gfwilliams opened this issue Sep 4, 2020 · 2 comments
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@gfwilliams
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Mentioned in http://forum.espruino.com/conversations/353215

It seems that while flicker is related to the accelerometer task running, it wasn't an issue in firmware 2v05, and is in 2v06 so something changed.

Either a much longer accelerometer task, or something to do with util timer handling?
@gfwilliams
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Note: cutting edge builds don't seem to have the issue, probably because of:

Bangle.js: Accelerometer poll handler now uses RTC app_timer, not TIMER1. 1mA->0.5mA standby current (ref #1920)

HOWEVER it seems that now the I2C bus is accessed from two IRQs and so it's possible to get I2C errors occasionally now if Bangle.setLCDBrightness(0.2); is used.

Uncaught Error: I2C Error: Arbitration (start)
Uncaught Error: I2C Error: Arbitration (start)
Uncaught Error: I2C Error: Arbitration (start)
Uncaught Error: I2C Error: Arbitration (start)
Uncaught Error: I2C Error: Arbitration (start)

gfwilliams added a commit that referenced this issue Sep 4, 2020
@gfwilliams
Fix I2C arbitration errors with dimmed backlight (#1925) - but we sti…
eca6aae 
…ll get some flicker
@gfwilliams
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Just fixed the arbitration errors but there are still flicker from when the IRQ fires while I2C is in progress in another IRQ.

Better solution might be to use the app timer for backlight too? It should reduce power consumption as well.

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@gfwilliams