GPY deepsleep High current

[tuftec]

@bouchard-claude
@Gijs can you help with this one. Maybe you could supply some clarity on the expected low power performance when using LTE.

Peter.

[kjm]

@bouchard-claude Try

import pycom; pycom.lte_modem_en_on_boot(0); pycom.wifi_on_boot(0)

at the start of your program to be sure both radios are off to begin with. My gpy (1.20.1.r1) deepsleeps at 40uA

[tuftec]

@kjm Sure just setting those boot flags once the program has started is too late. They will alter the next boot behaviour but not this one???????

From what I have read a lte.init(); lte.deinit() cycle should power the modem down.
Maybe the issue is actually the wlan. In my setup the wlan is on by default at boot and I specifically disable it with wlan.deinit() when I no longer need it, based on the status of a switch.

[bouchard.claude]

@tuftec Yeah, my understaning too is that thoses flag are to be set once, cause once the main.py is loaded, its way too late. But I did try and set the wifi on boot to 0 using the shell over serial, and I did re-test with no difference. As for the LTE on boot, well, I really need to use it during operation ( data is sent overs CAT-1 LTE). I can try and test it tomorow, but that wont solve my problem :S ( but maybe it would point to a direction)

[tuftec]

@bouchard-claude Yes, I understand you need LTE but do you use wifi (wlan).
In my application I use wlan, lora, sigfox & nb-iot. I make decisions at various stages in my code to enable/disable the relevant radio system that I need.
The wifi is typically on when the system boots so that you can set up a REPL connection over wifi. I deliberately turn it off and disable the REPL server at and early stage when I determine that I do not need it. turn it on only as a system configuration aide in the field. Otherwise, I need it to be off for security. You might need to explore turning off all the bits you do not need.

[bouchard.claude]

yes, exactly what i'm doing too. This project only required LTE, so im only powering one the LTE radio, and only during time for transmission and deinit it after. As for the Wifi, I did set the power_on_boot to off as a first setup thing once I pushed the initial code.

So I just did the test with the lte_on_boot and wifi_on_boot ( I set them manualy + put them in a empty main.py code with only thoses and a deepsleep command) and the current stayed a 266 uA all the time in the deepsleep. So even with the radio not on at boot the currect of the board is high
I'm using GPy with firmware version 1.20.2.r3 . Any way to see what changed between version?

[tuftec]

@bouchard-claude You could try wading through all the release logs looking for changes, but I have not found a lot of joy in that previously. Maybe you need to test the old 1.20.1r1 release on you Gpy. Hopefully that will provide some insight.

I would also do the wlan init/deinit thing early in your code just to be sure it is off. Also disable the server in the same way. server.deinit() after you have defined it. The server interacts with the wlan. I am not sure if it enables it without you knowing. Worth a try anyway.

[bouchard.claude]

Yeah, but all the test im running now are with no code , Only the deepsleep and the stuff we are trying ( no lte on boot, no wifi on boot, lte deinit() ...) and it has the exact same current draw then with my complete code during deepsleep.

A weird things I just found is every time I run this to check my firmware version:

import sqnsupgrade
sqnsupgrade.info()

it give me the info, then immetiatly crash, core dump and restart . So maybe something is up with the whay the firmware deal with the modem? Ill try and switch versions to see if it help.. And also will try on a different GPy ( and a fipy) when ill have some time

[tuftec]

@bouchard-claude Are you getting the crash with your current measuring device in circuit? Previously when I was doing low current measurements, on devices that were capable of considerably higher current draw, I would wire a shut switch across my meter so that I could bypass it when I needed full current. Usually a device capable of measuring ultra low currents is not capable of handling the full power requirements of the device.
Typically I would start the system with the shut switch closed, then place the device into its low power state and open the switch just to take the low current measuement. This avoids any issues with large voltage drops across you meter when the current ramps up.

[bouchard.claude]

@tuftec Exactly what I do too ;) I have a shut switch that i open once the device is deepsleeping only. ( my test that make it crash is using the USB connection and the breakout board to a computer, no current measurement taken during this test.)

[tuftec]

@bouchard-claude Interesting.
Just tried the sqnsupgrade.info() test with a FiPy on my breakout board (V3.1) and get exactly the same issue. It crashes after displaying the modem information. Something about a prohibited Store!!!!!

>>> import sqnsupgrade
2020/12/30 17:34:59: import sqnsupgrade
>>> sqnsupgrade.info()
2020/12/30 17:35:20: sqnsupgrade.info()
<<< Welcome to the SQN3330 firmware updater [1.2.6] >>>
>>> FiPy with firmware version 1.20.2.r3
2020/12/30 17:35:29: Your modem is in application mode. Here is the current version:
2020/12/30 17:35:31: UE6.0.0.0
LR6.0.0.0-41019

IMEI: 354346090972786
Guru Meditation Error: Core  0 panic'ed (StoreProhibited). Exception was unhandled.
Core 0 register dump:
PC      : 0x4019072a  PS      : 0x00060830  A0      : 0x801901df  A1      : 0x3ffbaef0  
A2      : 0x00000000  A3      : 0x00000000  A4      : 0x00000005  A5      : 0xffffffff  
A6      : 0x00021266  A7      : 0x00060021  A8      : 0x8018fde0  A9      : 0x3ffbaeb0  
A10     : 0x0000002c  A11     : 0x00000000  A12     : 0x3ffb9f28  A13     : 0x00000000  
A14     : 0x3ffb9f38  A15     : 0x00000001  SAR     : 0x00000000  EXCCAUSE: 0x0000001d  
EXCVADDR: 0x0000002d  LBEG    : 0x4009412c  LEND    : 0x4009415a  LCOUNT  : 0xffffffff  

ELF file SHA256: 0000000000000000000000000000000000000000000000000000000000000000

Backtrace: 0x4019072a:0x3ffbaef0 0x401901dc:0x3ffbaf10 0x40180044:0x3ffbaf30

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================= CORE DUMP END =================
Rebooting...
ets Jun  8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff8020,len:8
load:0x3fff8028,len:2128
load:0x4009fa00,len:19760
entry 0x400a05bc
2020/12/30 17:35:37: SYSTEM RESTART?```

Maybe @gijs can help here.

I have not seen this previously.
Maybe something to do with firmware V 1.20.2.r3 ????

[kjm]

@bouchard-claude My 40uA deepsleep is just the gpy, does not include any current drawn by an expansion board.

[bouchard.claude]

@kjm said in GPY deepsleep High current:

@bouchard-claude My 40uA deepsleep is just the gpy, does not include any current drawn by an expansion board.

Make sense. My 280 uA is measured without any expansion board either.

[Gijs]

@tuftec we are aware the command sqnsupgrade.info() gives the information you need, and then coredumps (this also happened in r2, and sometimes in r1, especially on pybytes versions, ). Its not really 'mission critical' (there are other ways to get the information that do not coredump), but we will look at solving it, Thanks!
Gijs

[bouchard.claude]

@Gijs Thanks for the info. I wont worry about this then. would you be able to help us figuring out what is the deepsleep current we should be getting while powered by VIN with nothing plugged in? I'm not sure if I should contact pycom by email for this king of info?

thanks

[Gijs]

That is definitely something I want to work on bringing together! A table of some sort with current specifications of what to expect in certain scenarios. For now, it can wildly vary with firmware versions (and LTE modem firmwares) as you probably followed above and in other threads as well. I cannot tell you when it will be finished, but when its done, it will be on the documentation!

[bouchard.claude]

Hi @Gijs , did you had time to work on this in the past weeks? This issue is preventing us from moving to preprod as we are draining the battery way too fast for the application. and it will be important for me to understand what to expect of the pycom platform.

Thanks!

[Gijs]

I did not get started on this (Im only on parttime and there's lots of 'higher priority' issues to solve first, its still on my list though!). What I can tell you, is that ~220uA for deepsleep is is quite high, we're expecting around ~40uA (my colleague @peterp did some work on the pysense / pytrack deepsleeping as well, to bring the current draw even further down, theres some additional info on that here: https://github.com/pycom/pycom-libraries/issues/132). It could potentially be related to the modem firmware and my colleague attached the beta firmware here for NB-IoT, or email me at support@pycom.io for the Cat-M1 firmware (it requires some additional updating instructions)

On the Pysense / Pytrack there is an option to cut the power to the module, bringing the deepsleep current closer to 0 (we use a PIC on the pysense / pytrack that keeps track of the wakeup time and turns the power back on)

[peterp]

Allow me to add some more comments. 220uA in deepsleep is too much, this is not expected. Outside of an Expansion board, just supplying vin and gnd, it should be 20-21 uA in deepsleep (with 3.75V supply). In an Expansion board 3.1 I see it as low as 57uA.

Do you have jumpers (which) and/or SD card inserted? 57uA is without any.