PMIC Slow Flashing - Is there a way to reset in code?

[chipmc]

I am reposting this as this issue is coming up in a small number of devices in my fleet.

I have been working through some charging issues with deviceOS@2.1.x and in some cases the devices will not charge and have a 1 Hz flashing yellow charge led.

Is there a way to reset the PMIC short of manually removing power from the device?

I have tried pmic.watchdogReset() and power cycling using the EN pin but no luck. Any suggestions?

Thanks,

Chip

[no1089]

Hi Chip,

This works to reset the PMIC completely:

System.setPowerConfiguration(SystemPowerConfiguration());

Enable/disable charging with the new API is not yet in.

Power Management FAQ

[no1089]

This shows charing enabled/disabled in 3.0
https://go.particle.io/shared_apps/608a98db456ab200168b553b

[chipmc]

@no1089 ,

Thank you for sharing, this is an essential functionality and I am very happy to see it in deviceOS@3.x

I can’t wait to be able to move to the new power management API but my production devices are on the deviceOS@2.x track. I guess this is something I will have to look forward to using sometime in 2022?

Thanks,

Chip

[chipmc]

@no1089

System.setPowerConfiguration(SystemPowerConfiguration());

@no1089 , Great FAQ document! Any chance you could cover this topic as well. Seems like there are three things we need to clean up: PMIC, FUEL and the Power Configuration API.

SoC returns 0.00 at times (bsom eval board)

@tunahammer , Wow, that is a lot of instructions when what you need to know is the state of charge. All of this is because you can’t rely on the new System.batteryCharge() call that was added after deviceOS@1.5.0? And the reason it does not work is because you are checking the charge level after coming out of sleep? I am just wondering if we should be pressing for the System call to be fixed rather than adding management of the fuel gauge to our code. BTW, I have been using this approach for…

Thanks,

Chip

[no1089]

Yes, unfortunately, It won’t be implemented in 2.x as LTS has been feature locked.
3.x has been pre-released and thus far behaves very well. It is however the development branch and I am not 100% sure when the next LTS will be released.

Just to clarify - 2.x includes the new Power management API, just not the disable charging feature.

[no1089]

@chipmc

@no1089 , Great FAQ document! Any chance you could cover this topic as well. Seems like there are three things we need to clean up: PMIC, FUEL and the Power Configuration API.

Thanks!
The document will evolve over time - it's missing the 3.x changes right now and I will definitely add Fuel gauge advice as well. An incorrect SoC is certainly annoying to deal with.

[chipmc]

@no1089 ,

Understand about the new Power Management API and I am using that as well to manage solar charging.

I also understand that the 2.x release is feature and I believe this is a smart approach - all move production devices are on this release after all.

Chip