Proposed implementation for device scanning

[mattborja]

A rather basic implementation to scan for a specific device address.

This was tested against a AT24C256C breakout board where all I2C pins except VCC were wired (onboard LED was emitting, but visibly underpowered) using the following snippet:

#define XEEPROM_ADDR 0x50

void xEEPROM_demo() {
  // I2c.timeOut(10000);

  Serial.println("Checking wire status...");

  I2c.begin();
  bool found = I2c.scanFor(XEEPROM_ADDR);
  I2c.end();

  Serial.println(found ? "WIRE_OK" : "WIRE_TIMEOUT");
}

Wire check also returned extremely fast, way under timeout value that was originally under test. Seems doing this form of preliminary device checking before attempting to read/write might even be preferred in real applications vs. the timeout people have been calling for for a while now (i.e. arduino/ArduinoCore-avr#42).

[mattborja]

It appears Wire.setWireTimeout() now covers my use case, so I'm going to close this out as I'm switching back to native libraries.