An Example Of Doing An I2c Slave With Arduino - Gists · GitHub

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dotdoom/i2c.ino Created June 1, 2016 09:51 Show Gist options

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#define I2CAddress 0x42

void setup() {

Wire.begin(I2CAddress);

// Remember to keep those handlers as time-critical as possible:

// no interrupts will be happening while these are running.

// Also the other end of i2c communication might just

// give up waiting. So keep the logic in loop() and let i2c

// handlers only operate on ready data.

Wire.onReceive(i2cReceive);

Wire.onRequest(i2cRequest);

}

volatile byte i2cRegister = 0xff;

void i2cReceive(int bytesReceived) {

i2cRegister = Wire.read();

if (bytesReceived > 1) {

// This is i2c "write" request; read data with Wire.read()...

}

// onReceive will not be invoked unless rxBuffer is empty.

// Clean it up manually.

while (Wire.available()) { Wire.read(); }

}

void i2cRequest() {

// Use Wire.write() to send the data from register i2cRegister...

}

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