Method writeWords

Sming/Libraries/I2Cdev/I2Cdev.cpp:640–690

Write multiple words to a 16-bit device register. * @param devAddr I2C slave device address * @param regAddr First register address to write to * @param length Number of words to write * @param data Buffer to copy new data from * @return Status of operation (true = success) */

 * @return Status of operation (true = success)
 */
bool I2Cdev::writeWords(uint8_t devAddr, uint8_t regAddr, uint8_t length, uint16_t* data) {
    #ifdef I2CDEV_SERIAL_DEBUG
        Serial.print("I2C (0x");
        Serial.print(devAddr, HEX);
        Serial.print(") writing ");
        Serial.print(length, DEC);
        Serial.print(" words to 0x");
        Serial.print(regAddr, HEX);
        Serial.print("...");
    #endif
    uint8_t status = 0;
    #if ((I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO < 100) || I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_NBWIRE)
        Wire.beginTransmission(devAddr);
        Wire.send(regAddr); // send address
    #elif (I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO >= 100)
        Wire.beginTransmission(devAddr);
        Wire.write(regAddr); // send address
    #elif (I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_FASTWIRE)
        Fastwire::beginTransmission(devAddr);
        Fastwire::write(regAddr);
    #endif
    for (uint8_t i = 0; i < length * 2; i++) {
        #ifdef I2CDEV_SERIAL_DEBUG
            Serial.print(data[i], HEX);
            if (i + 1 < length) Serial.print(" ");
        #endif
        #if ((I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO < 100) || I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_NBWIRE)
            Wire.send((uint8_t)(data[i] >> 8));     // send MSB
            Wire.send((uint8_t)data[i++]);          // send LSB
        #elif (I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO >= 100)
            Wire.write((uint8_t)(data[i] >> 8));    // send MSB
            Wire.write((uint8_t)data[i++]);         // send LSB
        #elif (I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_FASTWIRE)
            Fastwire::write((uint8_t)(data[i] >> 8));       // send MSB
            status = Fastwire::write((uint8_t)data[i++]);   // send LSB
            if (status != 0) break;
        #endif
    }
    #if ((I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO < 100) || I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_NBWIRE)
        Wire.endTransmission();
    #elif (I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE && ARDUINO >= 100)
        status = Wire.endTransmission();
    #elif (I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_FASTWIRE)
        Fastwire::stop();
        //status = Fastwire::endTransmission();
    #endif
    #ifdef I2CDEV_SERIAL_DEBUG
        Serial.println(". Done.");
    #endif
    return status == 0;
}

/** Default timeout value for read operations.
 * Set this to 0 to disable timeout detection.