BLE fails to init sometimes

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incognico
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Joined: Tue Jun 05, 2018 4:51 am

BLE fails to init sometimes

Post by incognico » Thu Apr 09, 2020 4:07 am

Hi all,

I am seeing some occasional issues instantiating BLE:

unknown response: 0e 04 01 4c
fail3 0e


Then setting active(1) [or 0] hangs. A CTRL-C breaks out to the REPL.

Is there some way to validate the object creation? The object is of the type <BLE> even when this happens :(

--Nick

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jimmo
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Re: BLE fails to init sometimes

Post by jimmo » Tue Apr 14, 2020 5:13 am

hi,
incognico wrote:
Thu Apr 09, 2020 4:07 am
I am seeing some occasional issues instantiating BLE:
Could you please confirm which version of MicroPython and which PYBD model you're using. (Just copy the output from a soft reset).

Does WiFi work fine?

incognico
Posts: 19
Joined: Tue Jun 05, 2018 4:51 am

Re: BLE fails to init sometimes

Post by incognico » Tue Apr 14, 2020 7:59 am

Sorry, I'm not using WiFi in the project so can't comment on that just yet.

MicroPython v1.12 on 2019-12-20; PYBD-SF6W with STM32F767IIK

In case it's relevant: I have the eMMC installed but not yet powered up during BLE object creation.

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jimmo
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Re: BLE fails to init sometimes

Post by jimmo » Tue Apr 14, 2020 11:13 am

incognico wrote:
Tue Apr 14, 2020 7:59 am
MicroPython v1.12 on 2019-12-20; PYBD-SF6W with STM32F767IIK

In case it's relevant: I have the eMMC installed but not yet powered up during BLE object creation.
Thanks. I've got a WBUS-EMMC here somewhere will test it out myself and get back to you.

FWIW one of the main things that active(1) does is upload the firmware blob into the BT controller, and the "fail3" indicates that it's failing during fw upload.

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jimmo
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Re: BLE fails to init sometimes

Post by jimmo » Wed Apr 15, 2020 7:20 am

incognico wrote:
Tue Apr 14, 2020 7:59 am
In case it's relevant: I have the eMMC installed but not yet powered up during BLE object creation.
OK I've done a few power cycles with the WBUS-eMMC installed and ble.active(True) works every time. Also works when the eMMC is active too.

So when you say " some occasional issues", how occasional do you mean? Any hints on how to repro?

incognico
Posts: 19
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Re: BLE fails to init sometimes

Post by incognico » Wed Apr 15, 2020 8:09 am

I've had it starting (RTC alarm) every 20 seconds from standby(). It beacons the battery percentage (LiFePO4 fuel gauge, i2c) for 1 second then drops into standby() and the process repeats.

The 20-second period is short but I wanted to make sure this was robust and also so I could see the battery being impacted faster.

This setup has never once made it through the night (in ~2 weeks) without the above issue and unfortunately since it hangs in a [relatively] high-current state, has killed a couple of the little LiFePO4s :(

I have implemented a WDT workaround and it's been running (3 devices) for ~48 hours now ok.

Clearly this is an unusual scenario and I understand if it goes on the "maybe later" pile ;)

--Nick

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jimmo
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Re: BLE fails to init sometimes

Post by jimmo » Wed Apr 15, 2020 10:10 am

OK thanks for the info, I'll see if I can set up something like this and leave it running overnight.
incognico wrote:
Wed Apr 15, 2020 8:09 am
I've had it starting (RTC alarm) every 20 seconds from standby().
So just to clarify, main.py is along the lines of:

ble.active(True)
# report temperature via ble
ble.active(False)
rtc.wakeup()
pyb.standby()

i.e. it does an active(False) before the standby()?

Interestingly I had just a few days ago added "Low-power mode (e.g. beacon while main chip in standby)" to the TODO list on https://github.com/micropython/micropython/issues/5186 so investigating the interaction with the main chip going into standby was definitely an area that I wanted to look into anyway.

incognico
Posts: 19
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Re: BLE fails to init sometimes

Post by incognico » Thu Apr 16, 2020 1:37 am

Yep, that's all correct, including the active(False).

And now you can see why I was asking about the beaconing in standby :D

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