After struggling for a while, I had this Core2 replaced at the shop where I bought it as an initial defect.
I'm not sure, but it seems that the display mechanism in Arduino and the display mechanism in UIFlow are different, and even if Factory Test works normally, it may not work properly in UIFlow.

@robertoperez777 Via M5Burner

@felmue Thanks, that fixed it

For anybody else looking at fixing the issue with multiple simultaneous button presses it seems it can't be done.

Having dived into the M5Core2 source the events generated for two button presses, e.g. A & C, are press for A and move for A.
This looked like a deeper bug (since the second should have been identified as C), so going further in I found that an else branch wasn't refreshing the currently identified touched button on second press (C) in the method "doEvents" in touch.cpp (it doesn't help the code isn't documented, isn't single responsibility and has an arrow antipattern too).

Fixing that bug, so the correct button is refreshed, showed that two events together did not produce presses for A & C but instead (I assume - I'm fed up at this point) the hardware averages the presses' coordinates and declares it's button B(!) that is pressed.

If you have old Core 1 code you're porting that uses two simultaneous button presses I'd suggest changing the code to double taps of a single button instead which is the workaround I'm about to use - to remain consistent this behaviour is both on Core 1 and Core 2

More formally, I should have read the file header in touch.h earlier:

the M5Stack Core2 touch display is only
multi-touch in one dimension. What that means is that it can detect two
separate touches only if they occur on different vertical positions.
This has to do with the way the touch screen is wired, it's not
something that can be changed in software. So you will only ever see
two points if they do not occur side-by-side. Touches that do happen
side-by-side blend into one touch that is detected somewhere between
the actual touches.

Just a follow up. I contacted M5Stack tech support and they told me the old modules have pins that are 2.5mm and the new board has pins that are 3mm. So in theory I have the newer board but it separates from the Core2 fairly easily. Meaning the pins are probably making contact but not great. Will have to get longer screws and screw the module down to ensure good contact. For reference to separate from the Grey Core it is very tight and I usually use a screwdriver. I measured and the Grey Core lets the pins seat approximately 1mm more than the Core2. Here is a picture showing how to measure pin length. 0_1611190652059_Pins.jpg

Hello @shay

sorry, my bad. I incorrectly assumed you'd be using an M5GO2 bottom with your M5Core2 which exposes ports B and C.

You are correct, the only port directly available on M5Core2 is port A, which by default is used for I2C and not serial. So yes, I guess the easiest for you is to get an M5GO2 bottom.

Thanks
Felix

Hello @ckuehnel

glad to hear and thanks for letting me know.

Thanks
Felix

@se said in Core2 Port I2C Not Working:

Felix thanks for the suggestion. You were absolutely correct version 1.7.0 resolved the problem.

Now in 1.7.1.1 this problem was fixed.

Hello @NetworkUke

good to hear you got it working.

Happy Stacking!
Felix

Hello @TheAlphaGhost

I think the code you uploaded is for M5Stack and not M5Core2.

Please use #include <M5Core2.h> at the top and remove M5.Power.begin() which is required for M5Stack only.

#include <M5Core2.h> void setup() { M5.begin(); M5.Lcd.print("Hello World"); } void loop() { }

You probably will need to download and install the proper library for M5Core2 as well.

Thanks
Felix

Thank you Felix.

Hello @jhubsch

on M5Core2 LCD brightness is controlled by AXP192 (as you've already figured out yourself) so changing LCD brightness should work with:

M5.Axp.SetLcdVoltage(v); // v from 2500 to 3300

Thanks
Felix

@nlindin This one works!

#include <M5Core2.h>
#include <IRremote.h>

IRrecv irrecv(35);
decode_results ircode;

void setup() {
M5.begin();
irrecv.enableIRIn();
}

void loop()
{
if (irrecv.decode(&ircode))
{
Serial.println(ircode.value, HEX);
delay(100);
irrecv.resume();
}
m5.update();
}

Maybe it would be an idea to use an I2C to 1-Wire converter? Like the DS2482-100. Then you can have several I2C devices on the bus and also 1-Wire devices. I have not tried the chip yet. But I will do that soon.

Hi!
Board settings==board info?

Whit "M5Stack-Core-Esp32"> M5Stack Arduino> M5Stack-Core2 works nice to me.

@ajb2k3 thanks for your answer but as you can see just above I already got the answer from another post on the forum.
In fact this is not that simple.
Yes you can flash the device with the binaries found on the MicroPython website but then you only get the basic lib to get access to the ESP32.
If you want to take advantage of all 'surrounding' features like touch screen, accelerometer etc...then, unlike with UIFlow where the libs do encapsulate all those surrounding features, you have to dig yourself and find the correct libs as M5Stack is not providing one.