i2c Slave OnReceive - C++

The i2c (Inter-Integrated Circuit) protocol is a popular standard for low-speed communication between microcontrollers, sensors, and various other digital devices. In this context, i2c slave onreceive refers to a specific function that listens for incoming data on the i2c bus.

In C++, the i2c slave onreceive function can be implemented using the Wire library, which provides a set of functions to communicate over the i2c bus. The Wire library is usually included in most Arduino boards, and it is also compatible with other microcontrollers.

Here is an example of how to use the i2c slave onreceive function in C++:

#include <Wire.h>

void setup() {
  Wire.begin(8);                // join i2c bus with address #8
  Wire.onReceive(receiveEvent); // register receive event
}

void loop() {
  delay(100);
}

void receiveEvent(int howMany) {
  while (Wire.available()) { // loop through all incoming data
    char c = Wire.read();    // read incoming byte
    // do something with data...
  }
}

In this example, the Wire.begin function initializes the i2c bus with the slave address 8. The Wire.onReceive function registers a callback function called receiveEvent, which is called automatically whenever the i2c master sends data to the slave. Finally, the receiveEvent function loops through all the incoming data and processes it according to the application's needs.

It is important to note that the i2c slave onreceive function must always be ready to receive incoming data, as the master can send data at any time. The implementation must account for this and handle incoming data quickly, especially in real-time applications.

In conclusion, the i2c slave onreceive function is a powerful tool for implementing i2c communication in C++ applications. By using the Wire library and defining a callback function to handle incoming data, developers can create robust and reliable microcontroller-based systems that can communicate seamlessly with other digital devices over the i2c bus.