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Description
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:
