I2C communication between NRF52832 hangs

[ssysm]

Operating System

MacOS

IDE version

Arduino 2.1.0

Board

Feather 52832

BSP version

1.4.0

Sketch

Receiver:

#include <Wire.h>
#include <Adafruit_TinyUSB.h>

void setup()
{
  Serial.begin(115200);
  while(! Serial) delay(10);
  Wire.begin(0x50);
  Wire.onReceive(receiveEvent);
}

void loop()
{
  delay(100);
}

// function that executes whenever data is received from master
// this function is registered as an event, see setup()
void receiveEvent(int howMany)
{
  while(1 < Wire.available()) // loop through all but the last
  {
    char c = Wire.read(); // receive byte as a character
    Serial.print(c);         // print the character
  }
  int x = Wire.read();    // receive byte as an integer
  Serial.println(x);         // print the integer
}

Sender:

#include <Wire.h>

void setup()
{
  Wire.begin(); // join i2c bus (address optional for main)
}

byte x = 0;

void loop()
{
  Wire.beginTransmission(0x50); // transmit to device #0x50
  Wire.write("x is ");        // sends five bytes
  Wire.write(x);              // sends one byte  
  Wire.endTransmission();    // stop transmitting

  x++;
  delay(500);
}

What happened ?

Two NRF52832 Feather is connected via I2C port. When sender is running without the receiver attached, the sketch is running fine. But when the receiver is attached, the sender hangs on endTramission.

How to reproduce ?

Connect Sender SCL, SDA to another NRF52832 SCL and SDA port. Connect a 2.2k Pull up resistor between SCL and VCC, SDA and VCC. Once receiver is attached, the sender will hang.

Debug Log

No response

Screenshots

I2C bus scope capture:

[apoorv1in]

I see the Wire_nRF52.cpp does not have timeout implemented endTransmission() and requestFrom() there are multiple while loops and none have timeout implemented. Under certain scenarios then the call never returns.

If i take reference from Arduino library it has the timeout https://github.com/arduino/ArduinoCore-avr/blob/master/libraries/Wire/src/utility/twi.c