Wire.begin(driverName)
Initialize I2C as Master and will use the specified I2C device driver name.
Parameters
driverName - Name of I2C device driver port. (e.g “/dev/i2c-1”)
Returns
None
Example
#include <Arduino.h>
#include <Wire.h>
void setup() {
Wire.begin("/dev/i2c-0");
}
void loop() {
// Send two bytes to an I2C slave device with address 0x70
Wire.beginTransmission(0x70);
Wire.write(42);
Wire.write(42);
Wire.endTransmission();
// Request 6 bytes from an I2C slave device with address 0x70
Wire.requestFrom(0x70, 6);
// Wait for data from I2C slave device
while (Wire.available()) {
char c = Wire.read();
printf("Recieved = %c \n", c);
}
}Notes
- Wire default device driver is “” (empty) meaning that it will search for any existent I2C device driver and will give priority to “/dev/i2c-1”. if you want to change the default device driver change the I2C_DRIVER_NAME constant as the example below.
#include <Arduino.h>
#include <Wire.h>
void setup() {
strcpy(I2C_DRIVER_NAME, "/dev/i2c-4");
Wire.begin(); // Will try open device driver "/dev/i2c-4"
}
void loop() {
...
}