Hello,

I use a lot of own libraries to control my home. Last library was a small extension of Adafruit_NeoPixel to show some status information.

I tested with four libraries (M5Core2.h, Wifi.h, Adafruit_NeoPixel.h and my lib) with a small test program with Arduino IDE and it worked fine. I used 16*16 led ws2812.

Then a changed back to my ESP-IDF and use the some libraries and some more stuff. If I started to switch some less on my WS2812 in green color, it worked 4 or 5 times without problems. At the next one switching event I got a problem on the second half of the leds:

• Some switch the color from green to blue

• Some led switch incorrect on

The first 100 to 120 leds all always correct. I think it is a interrupt problem, but in then Adafruit_NeoPixel.h interrupts stopped. I double-checked if this part worked:

  // NRF52 may use PWM + DMA (if available), may not need to disable interrupt
#if !( defined(NRF52) || defined(NRF52_SERIES) )
  noInterrupts(); // Need 100% focus on instruction timing
#endif

I also stop interrupts im my library for the critical part, but it didn't work. My unfounded suspicion is a unstoppable interrupt in M5Core2.h or similar.

Do anyone have an idea?

Hello,

in past I used some M5Stack modules at M5Stack and now I like to migrate to M5Core2. The challenge ist the different bus system.

Pin	M5Stack	M5Core2
GND	2	1,3,5
SCK	4	11
MISO	6	9
RESET	8	6
nu	10	-
nu	12	-
A0	14	-
A1	16	-
A2	18	-
A3	20	-
A4	22	-
A5	24	-
AREF	26	-
IO12	28	-
IO13	30	-
5V	1	28
MOSI	3	7
SS	5	-
D0/RX	7	13
D1/Tx	9	14
D2/SDA	11	SYS:17, EXT:19
D3/SCI	13	SYS:18, EXT:20
D4	15	-
D5	17	-
D6	19	-
D7	21	-
IO8	23	-
IO9	25	-
IO10	27	-
IO11	29	-
IO35	-	2
IO36	-	4
IO25	-	8
IO26	-	10
3,3V	-	12
Rx2	-	15
Tx2	-	16
IO19	-	22
IO0	-	24
IO34	-	26
BAT	-	30

Who has experience with using an M5Stack module on an M5Core2?

Hello @Rop,

thank you for your help. Do you test it with M5Core2-enviroment?
I generated a "FreeSerif34pt7b" from you website and compilation of my
program was ok.

If I started the M5Core2 and I used the new font to see the time, for example 08:29,
I saw 00 88 :: 22 99 in the first line und a second line with the top of the characters.

It seemed, that the length of the characters in the font was not okay.

Hello,

I need a big font for my application, in the factory example the EVA font is used.

I like to use a font like "Font72rle".
First step is to include the new font:

#include <Fonts/Font72rle.h>

How can I use the new font?
The function setFreeFont didn't work for me.

Hi @brus,

thank you for providing your repro. In the meantime I've put together my own version and I'm waiting for the official version of m5stack.

Hi @felmue,

I started M5Core2-Factory test, disconnected USB and go away. About 5 hours later I came back and tried to switch on M5Core. Nothing happened.

I connected USB, flashed the M5Core2 with the factory test program and everything worked fine.

At the last day I used my RTC-library with alarm functions and more and it worked continuously.

Cheers

Hi @felmue,

yes, I believe that I wrote incorrect values in one (or more) of the RTC registers and that the BM8563 was factory or default reset due to the dead (!) battery.

Before I wrote back all registers with data sheet informations and so the RTC did not get back on track.

Thanks,
Uwe

Hello @felmue,

thanks for your answer. I meant that writing the value 0 in all status registers would not reset the BM8563!

I used a similar function for reading and writing:

void RTC::readBytes(uint8_t reg, uint8_t nbytes, uint8_t *data) {
  Wire1.beginTransmission(BM8563_ADDRESS);
  Wire1.write(reg);
  Wire1.endTransmission();
  Wire1.requestFrom(BM8563_ADDRESS, nbytes);
  uint8_t index = 0;
  while( Wire1.available() )
      data[index++] = Wire1.read();
}


void RTC::writeBytes(uint8_t reg, uint8_t nbytes, uint8_t *data) {
  Wire1.beginTransmission(BM8563_ADDRESS);
  Wire1.write(reg);
  for (uint8_t i = 0; i < nbytes; i++)
      Wire1.write(data[i]);
  Wire1.endTransmission();
}

In the meantime I found an old fashion solution, because a fresh copy of M5Core2 library didn't not help. The problem was inside the registers of BM8563.

I disconnected the M5Core2 from USB and wait until the battery was empty. Now it's working again.
the problem was to factory reset the BM8563.

Hello,

the Core2 contains an RTC component, the BM8563. The RTC library has so far only a few functions and uses e.g. the status register does not return.

I have now expanded the library to include these alarm functions:

   void GetAlarm (RTC_AlarmTypeDef * RTC_AlarmStruct);
   void SetAlarm (RTC_AlarmTypeDef * RTC_AlarmStruct);

   void enableAlarm ();
   void disableAlarm ();
   void resetAlarm ();
   bool alarmActive ();

At start the functions worked very well, but now I can no longer use the BM8563 in normal way. At the start it always outputs the date 05.01.00 and a time from 00:07:00 to 00:07:07 and then starts again from 00:07:00. Other Arduino-libraries also show the same effect.

Resetting all registers from 00 to 0E to the value zero didn't help either, does anyone have an idea?