So if anyone else stumbles upon this...

I had M5.powerbegin() in my code, and that will of course enable i2c, so that's the reason for my issues.

Hi.

I am trying to use this as normal inputs.
I have a square wave signal input, and if the signal is present during boot I cannot read it.
If I boot with nothing connected, I can connect and it works like expected.
Is there some special behavior on this pins if they are high or low at boot?

Hi again.

I have experimented a lot now, my current power settings are as follows:

M5.Power.setPowerBoostOnOff(false); //Change the power on / off method. The power does not turn off when connected via USB. true=Press and hold to turn on / off. false=Turn on / off with two short presses.
M5.Power.setPowerBoostSet(true); //Change the power on / off method true=ON / OFF in one short press. false=same as above
M5.Power.setPowerVin(true); //When the power supply from USB etc. is cut off, Decide whether to turn on the power again.
M5.Power.setPowerBtnEn(true); //Set whether to accept the power button.
M5.Power.setPowerBoostKeepOn(false); //Always output power. True= Always output power. False=not Always output power.
M5.Power.setAutoBootOnLoad(true); //Set whether to automatically start when power consumption occurs

This lets me turn the M5 off/on with the power button with single click. However, it does NOT work if the USB HOST module is connected.
I can turn it off, but it never turns on again, until I connect usb to the M5core directly.

Use one 120ohm resistor in each end of the bus.
If unclear try google for "rs485 termination"

I have the same button #52 issue.
A small delay in the loop (ref comments in the issue) makes it a lot better, but I still experience it some times and need to keep that in account.

Mine only reboot if I try to turn it off by double click.

Is there a way to actually turn it off from software?

Hi.
I have a setup with M5Core with the USB host module and GO battery.

My issues are as follows:
I use M5.poweroff after a timeout, but does not seem like the usb module powers off.
There is a significant power drain somewhere.

When the battery is depleted the M5 will not start up again, even if I fully charge the GO.
Only way to wake it is to put power into the M5 USBC connector.

Does anyone have a suggestion?

I use the included PowerOFF example.
Deepsleep works fine.

Here it is, I use it unmodified.
As soon as I push btn A it reboots with the guru error.

#include <M5Stack.h>

// the setup routine runs once when M5Stack starts up
void setup(){

// initialize the M5Stack object
M5.begin();

/*
Power chip connected to gpio21, gpio22, I2C device
Set battery charging voltage and current
If used battery, please call this function in your project
*/
M5.Power.begin();

// Lcd display
M5.Lcd.println("This is software power off demo");
M5.Lcd.println("Press the button A to power off.");
}

// the loop routine runs over and over again forever
void loop() {

if(M5.BtnA.wasPressed()) {
M5.Power.powerOFF();
}

M5.update();
}

Even with the simple PowerOFF example included I get a Guru when I try to shut it down, resulting in automatic restart.
Same result if I run it on USB, the M5 (red) battery module or the Go Battery module.

Any suggestions?

Module: Core Basic
Error:
Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled.
Core 1 register dump:
PC : 0x400e2c28 PS : 0x00060130 A0 : 0x800d3786 A1 : 0x3ffb1f30
A2 : 0x00000000 A3 : 0x3ffbf75c A4 : 0x00000001 A5 : 0x0000001d
A6 : 0x00000000 A7 : 0x3ffb0060 A8 : 0x800e2e02 A9 : 0x3ffb1f10
A10 : 0x00000014 A11 : 0x0000001d A12 : 0x00000001 A13 : 0x00000007
A14 : 0x00000020 A15 : 0x3ffb0060 SAR : 0x00000005 EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000134 LBEG : 0x4000c2e0 LEND : 0x4000c2f6 LCOUNT : 0x00000000

Backtrace: 0x400e2c28:0x3ffb1f30 0x400d3783:0x3ffb1f60 0x400d1136:0x3ffb1f90 0x400d7e5d:0x3ffb1fb0 0x40089819:0x3ffb1fd0

Rebooting...