ENV Hat 3 and StickC Plus 2 [Wire.513] requestFrom(): i2cRead returned Error 263

felmue

the only difference between Hat and Unit (apart from the different GPIOs it uses as @ajb2k3 pointed out) is that the Hat is powered by 3.3 V from M5StickCPlus2 whereas the Unit is powerd by 5 V (with an internal DC/DC converter).

I used the M5Unit-ENV library, copied the code you posted and manually wired the Unit to the Hat port. In other word I used exactly the code you posted without any modifications.

Sorry, at this point I have not more ideas as to why it wouldn't work on your side.

Thanks
Felix

PascalS

@felmue From your posts, I get the feeling that you have a lot of knowledge. :)

As a last ressort, I tried to find a I2C scanner sketch and ended up with the following code.

/*********
  Rui Santos
  Complete project details at https://randomnerdtutorials.com  
*********/

#include <Wire.h>
 
void setup() {
  Wire.begin();
  Serial.begin(115200);
  Serial.println("\nI2C Scanner");
}
 
void loop() {
  byte error, address;
  int nDevices;
  Serial.println("Scanning...");
  nDevices = 0;
  for(address = 1; address < 127; address++ ) {
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
    if (error == 0) {
      Serial.print("I2C device found at address 0x");
      if (address<16) {
        Serial.print("0");
      }
      Serial.println(address,HEX);
      nDevices++;
    }
    else if (error==4) {
      Serial.print("Unknow error at address 0x");
      if (address<16) {
        Serial.print("0");
      }
      Serial.println(address,HEX);
    }    
  }
  if (nDevices == 0) {
    Serial.println("No I2C devices found\n");
  }
  else {
    Serial.println("done\n");
  }
  delay(5000);          
}

I was not sure, but in all the sketches they used sda=0 and scl=26.

If I scan those, I cant get any devices found. However, if I scan the standard sda/scl = 21/22, then I find two devices (propably build into the Stick itself).

Is this a sign for an hardware failure?

Greetings Pascal

felmue

Hello @PascalS

from your first log I think the ENV III Hat was recognized properly else the log would have ended with either of the "Couldn't find ...".

Anyways, please find an I2C scanner for internal, Groove and Hat here.

Thanks
Felix

PascalS

@felmue Thanks for the link.

Strangely, they are now not showing up (not found is now in the log). That wasnt before.

PascalS

@felmue

The port scan went as expect, only internals are found.

I2C Scan - internal
................................................................................0x51 ......................0x68 ......................
I2C Scan - Groove Port
..............................................................................................................................
I2C Scan - Hat Port
..............................................................................................................................

Does that mean a hardware error?

Greetings Pascal

felmue

Hello @PascalS

hmm, have you tried to power cycle M5StickCPlus2?

disconnect USB
remove HAT
press and hold power button until green LED lights up
release power button - green LED goes dark - M5StickCPlus2 is now off
re-attach HAT
re-connect USB - M5StickCPlus2 powers on
re-test

Thanks
Felix

P.S. if that doesn't make the HAT show up in the I2C scan or make it work with the original program then I am afraid that yes, there might be a hardware issue.

PascalS

@felmue Thanks for your help :)

Propably it is a hardware failure, I do not get any i2c signals back.

Wil return it and run it with new hardware. I update the thread when I heard back from the seller.

Thanks for your help!

Greetings Pascal

PascalS

@felmue Unfortunately, also a newly bought M5Stick and a newly bought ENV hat didn´t change anything.

Could it be that the hat port uses another Wire?

felmue

Hello @PascalS

hmm, that is really strange. Do you have any other hat to try if the hat port works for you in general?

ENV III hat is supported in UIFlow2. Maybe try with UIFlow2? Just to see if it works that way.

Thanks
Felix

PascalS

@felmue You were right, in UIFlow 2 it worked perfectly fine. However, I need them to work in Arduino, so that it fits with our current framework.

Do you know were the difference between UIFlow 2 and Arduino is?

felmue

Hello @PascalS

at least we know now that the hardware is ok.

Apart from that I am stumped. Sorry.

Thanks
Felix

PascalS

@felmue Finally I got the solution using separate Wires and PlattformIO to manage my libraries :)

With the following ini file (PlattformIO config file)

[env:miniscale]
platform = espressif32@6.1.0
board = m5stick-c
framework = arduino
lib_ldf_mode = deep
monitor_speed = 115200
build_flags = 
	-DCORE_DEBUG_LEVEL=0
	-Wl,--allow-multiple-definition
lib_deps = 
	https://github.com/m5stack/M5StickCPlus2.git
	m5stack/M5Unit-ENV@^1.0.1

Not knowing why, but I need the "-Wl" to run at all and the "--allow-multiple-definition" flag for the hat to work in conjunction with sensors mounted to the groove port.
It worked, however, I need to change the I2C begin call from "Wire0" (just called Wire) to the secondary I2C channel Wire1

Before:

while (!qmp.begin(&Wire, QMP6988_SLAVE_ADDRESS_L, 0, 26, 400000U)) {
     Serial.println("QMP6988 not found");
 }

After:

while (!qmp.begin(&Wire1, QMP6988_SLAVE_ADDRESS_L, 0, 26, 400000U)) {
     Serial.println("QMP6988 not found");
 }

Maybe this helps someone in the future :)

ajb2k3

@PascalS Now I see the problem.
Wire is hard defined and set to internal.

You need to use Wire1 to access the external devices.
I vaguely remember reading about this issue before but as I don't have arduino I had forgotten about it.
Thanks for the reminder.