M5 StickC Plus2 Grove port not working

teastain

@A0Cyber What language/IDE are you using?
I have a Plus2 and use Arduino IDE if that is helpful.

felmue

both GPIO32 and GPIO33 work for me in UIFlow2. Please find an example in the Project Zone called: M5StickCPlus2_GPIO32_GPIO33_ON_OFF_UiFlow2.2.0
If you are using Arduino instead then could you share your code?

Thanks
Felix

A0Cyber

@teastain I am using Arduino and Arduino IDE as well. However, I wasnt able to use the grove Port A for I2C in UI Flow 2 either.

I started with this code to do an I2C wire scan. It returns Error 5 at all addresses, No I2C devices found when I have I2C devices connected.

#include <Arduino.h>
#include <Wire.h>

  // Board Pin Definitions
#define PIN_POWER_HOLD 4
#define PIN_LCD_BL 27
  //Internal I2C BUS 6-Axis posture sensor (MPU6886) & RTC (BM8563)
#define PIN_INTERNAL_SDA 21
#define PIN_INTERNAL_SCL 22
  //Grove Connector I2C BUS (Port A)
#define PIN_GROVE_SDA 32
#define PIN_GROVE_SCL 33

void wireScanTest() {
  Wire.begin(PIN_GROVE_SDA, PIN_GROVE_SCL, 400000);
  //Wire.begin(PIN_INTERNAL_SDA, PIN_INTERNAL_SCL, 400000);

  byte error, address;
  int nDevices = 0;

  delay(5000);

  Serial.println("Scanning for I2C devices ...");
  for (address = 0x01; address < 0x7f; address++) {
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
    if (error == 0) {
      Serial.printf("I2C device found at address 0x%02X\n", address);
      nDevices++;
    } else if (error != 2) {
      Serial.printf("Error %d at address 0x%02X\n", error, address);
    }
  }
  if (nDevices == 0) {
    Serial.println("No I2C devices found");
  }
}

void setup() {
  pinMode(PIN_POWER_HOLD, OUTPUT);
  digitalWrite(PIN_POWER_HOLD, HIGH);
  pinMode(PIN_LCD_BL, OUTPUT);
  digitalWrite(PIN_LCD_BL, HIGH);
  Serial.begin(115200);

  wireScanTest();
}

void loop() {}

So I made this to test the pins and i get the strange voltage on pin 32.

#include <Arduino.h>
#include <Wire.h>

  // Board Pin Definitions
#define PIN_POWER_HOLD 4
#define PIN_LCD_BL 27
  //Grove Connector I2C BUS (Port A)
#define PIN_GROVE_SDA 32
#define PIN_GROVE_SCL 33

void setup() {
  pinMode(PIN_POWER_HOLD, OUTPUT);
  digitalWrite(PIN_POWER_HOLD, HIGH);
  pinMode(PIN_LCD_BL, OUTPUT);
  digitalWrite(PIN_LCD_BL, HIGH);
  pinMode(PIN_GROVE_SDA, OUTPUT);
  digitalWrite(PIN_GROVE_SDA, HIGH);
  pinMode(PIN_GROVE_SCL, OUTPUT);
  digitalWrite(PIN_GROVE_SCL, HIGH);

  Serial.begin(115200);
}

void loop() {
  delay(5000);
  digitalWrite(PIN_GROVE_SDA, LOW);
  digitalWrite(PIN_GROVE_SCL, LOW);
  delay(5000);
  digitalWrite(PIN_GROVE_SDA, HIGH);
  digitalWrite(PIN_GROVE_SCL, HIGH);
}

A0Cyber

@felmue I looked at the example . Thanks for that. I created something similar in Arduino for my testing earlier.

felmue

Hello @A0Cyber

your I2C scan code works for me (internal and Grove).
Internal I get:

Scanning for I2C devices ...
I2C device found at address 0x51
I2C device found at address 0x68

Grove (with ENV IV attached) I get:

Scanning for I2C devices ...
I2C device found at address 0x44
I2C device found at address 0x76

and your Groove GPIO test works for me as well, both GPIO32 and GPIO33 toggle between 0 and 3.3 V.

Just to clarify; does the internal I2C scan work with your M5StickCPlus2?

If yes, then the failing Grove I2C scan and the GPIO test showing a too low voltage on GPIO32 would indicate that GPIO32 got damaged somehow.

But then again, you tested with two M5StickCPlus2 and they both exhibit this behavior, so I am not sure.

Thanks
Felix

A0Cyber

@felmue The internal I2C bus scan works for me, I get the same result as you for that one. But the grove Port A fails with the low voltage on pin 32. I can even use jumper pins to run I2C devices from the top header by using jumper cables. I tested it with 2 brand new StickC Plus2 so the chances that both of them were damaged in the same way by me is unlikely. I am also somewhat experienced with ESP32 and other microcontrollers. I am out of ideas, I guess I can try to contact M5 support.

teastain

@A0Cyber Your code works on my Plus2!
Both pins 32 and 33 normal 3.3V.
Sorry.

kuriko

@A0Cyber
Maybe this is a potential circuit design problem. Can you tell me all the hardware operations you have done? I'm gonna have a test

paulgrevink

@A0Cyber I am experiencing the same situation. I have just started experimenting with M5 gear. I got 2 x M5 Stick C Plus2. The HAT works fine, however Grove ports worked for a short time and failed on both sticks.
I Started doing some tests in UIFlow 2.2, version 2.3.8 with a Unit, that went well. Proceeding some tests with ESP Home on the same devices, Noticing that the Unit did not respond. Back to UIFlow, and now the Unit failed.
I ran the Project Zone called: M5StickCPlus2_GPIO32_GPIO33_ON_OFF_UiFlow2.2.0 and noticed that PIN32 was less than 1 Volt. So to me looks like some hardware issue, but what went wrong? Still not clear to me.

felmue

Hello @paulgrevink

have you tried to disconnect everything from M5StickCPlus2 and fully powering it off by pressing and holding the power button?

Also have you tried to erase flash using M5Burner before installing UIFlow2 firmware?

BTW: I did a test and installed ESPHome basic firmware, then installed UIFlow2.3.8 firmware and then ran M5StickCPlus2_GPIO32_GPIO33_ON_OFF_UiFlow2.2.0 from Project Zone without issue, e.g GPIO32 and GPIO33 toggle just fine between 0 V and 3.3 V.

Note: While ESPHome was installed GPIO32 measured something like 0.2 V.

Thanks
Felix