![]() On the Arduino boards with the R3 layout (1.0 pinout), the SDA (data line) and SCL (clock line) are on the pin headers close to the AREF pin. This library allows you to communicate with I2C / TWI devices. MyData = Wire.Reference Language | Libraries | Comparison | Changes number of data bytes that have arrived from Master is equal to howMany Master gets ACK signal and reads data from Slave Buffer Slave MCU sends ACK and then goes to loop() function when that command comes from Master, the Slave is interrupted and comes here. ![]() Wire.requestFrom(0x20, 2) //2-byte data is being requested from Slave Your Master must be excuting codes that correspond to Wire.onReceive(receiveEvent) // master transmit event (write) Wire.onRequest(requestEvent) // master receive event (read) Wire.begin(0x20) // begin device as slave address 0x20 Volatile byte addr_pointer = 0xFF // points to address in dummy buffer ![]() Volatile byte data = // dummy register for i2c to access Is the implementation below faulty? I've tried looking through other questions relating to slave transmitter/receiver, but I couldn't find anything helpful. I've already tried testing the program and even tried to see a waveform appear on the oscilloscope, but I don't see anything. I'm trying to use the code below to test my master transmitter/receiver code for the ATmega644. I'm pretty new to Arduino software development, although I do have a background in embedded firmware with C. I'm having trouble with my I2C slave code for both a slave receiver and slave writer.
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