M5Paper stuck in M5.begin();

[michael_o]

Hi,

I'm doing my first steps with the M5Paper and even the slightest examples often fail, because the device is stuck in the M5.begin() function - it never returns from it.

With the next upload, it works again, slightest change - stuck again.

I'm using Arduino IDE. Am I doing something wrong or is my device faulty?

Best regards,

Michael

[ajb2k3]

Are you resetiing the M5Paper between each programming attempt?

[michael_o]

I'm not manually resetting it, no. But even if I reset it, it doesn't work.

[felmue]

Hello @michael_o

would you mind sharing one of the examples which fails on your M5Paper?

Thanks
Felix

[michael_o]

Sure. Even this tiny example fails. It prints "Begin", but not the "initializing ... OK" which M5.begin() usually prints.

#include <M5EPD.h>

M5EPD_Canvas canvas(&M5.EPD);

void setup() {
Serial.begin(115200);

Serial.printf("Begin\n");
delay(1000);

M5.begin();
M5.EPD.Clear(true);
}

void loop() {
yield();
}

[felmue]

Hello @michael_o

thanks. Most likely the issue is the double initialisation of Serial. If you have a look into M5.begin() you'll see that by default it initialises Serial as well.

    if (SerialEnable == true)
    {
        Serial.begin(115200);
        Serial.flush();
        delay(50);
        Serial.print("M5EPD initializing...");
    }

So I suggest you change your code to:

#include <M5EPD.h>

M5EPD_Canvas canvas(&M5.EPD);

void setup() {
  M5.begin();
  M5.EPD.Clear(true);
}

void loop() {
}

Note: untested as my M5Paper currently is in a long term battery test.

Hope this helps.

Thanks
Felix

[michael_o]

That's right, it looks like that was the problem. Thank you very much. What a peculiar behaviour if you init Serial twice.

Michael

[felmue]

Hello @michael_o

you are welcome. I am glad to hear you got it working and thank you for reporting back here.

Cheers
Felix