I was considering using your library for my I2C real-time clock in order to free up 2 analogue pins, but alas there isn’t an i2c.receive() feature.

I know you posted it a long time ago, But did you ever resolve your issue? I’m having the exact same problem on my Arduino Mega 2560. I don’t have any i2c device connected, I get the same result even if a device is connected. Once twi_write() executes, it crashes and resets. It never makes it past the first address it polls. It just continues to loop after the twi_write function starting at the beginning of the setup function and never makes it out to the loop function.

I have tried other sketches and the same thing happens. With a different sample sketch, it crashes/resets after the wire.endtransmission() function. I can’t get a return code from it.

Any help to point me in the right direction in troubleshooting this is greatly appreciated. I’m not sure what else to check or overlooked.

Thanks!

http://www.i2c-bus.org/addressing/

The sketch just hangs after

I2CScanner ready!

starting scanning of I2C bus from 1 to 100…

I plugged in some printlns and inside the following….the before prints, but the after does not.


for( byte addr = from_addr; addr <= to_addr; addr++ ) {
Serial.print("before");
rc = twi_writeTo(addr, &data, 0, 1);
Serial.println("after");
callback( addr, rc );
}


You noticed the two resistors on the SDA and SCL line, but what are the values?

Stephen