/**
 * @brief Starts the sensing of how many lumens there are.
 * @details Requests the sensor to retriever how many lumens there are
 * based on how long it is sensing, with shorter sensing durations being
 * able to read smaller lumens levels but cutting off at a lower lumen amount.
 * If there is a maximum light level for the interval try sensing at a larger
 * amount to see the non chipped off higher lumen input.
 *
 * @param time 400, 200, or 100. Units are in milliseconds.
 */
void Lumen_Sensor::start_continous_conversion(uint8_t time){
    // First set the timing interval.
        // Ask for access to the Lumen sensor
        Wire.beginTransmission(this->address);

        // We will be working with the Control Register(0x00).
        // Command bit = 1
        // 6:4 = 0
        // 3:0 = Config Register (0x01)
        Wire.write((1 << 7) | 0x01);

        // Set to continous conversion.
        // 0b00 = 400 milliseconds, 1x multiplier.
        // 0b01 = 200 milliseconds, 2x multiplier.
        // 0b10 = 100 milliseconds, 4x multiplier.
        // 0b11 = Reserved
        uint8_t TCNTRL;
        if (time == 400)
            TCNTRL = 0b00;
        else if (time == 200)
            TCNTRL = 0b01;
        else if (time == 100)
            TCNTRL = 0b10;
        else
            TCNTRL = 0b00;
        Wire.write(0x00 | TCNTRL);

        // End transmission.
        Wire.endTransmission();

    // And now we start the continous conversion!
        // Ask for access to the Lumen sensor
        Wire.beginTransmission(this->address);

        // We will be working with the Control Register(0x00).
        // Command bit = 1
        // 6:4 = 0
        // 3:0 = Control Register (0x00)
        Wire.write((1 << 7) | 0x00);

        // Set to continous conversion(Normal Operation)
        // 0b00 = Power down.
        // 0b01 = Reserved.
        // 0b10 = Run a single ADC cycle and return to PowerDown.
        // 0b11 = Normal operation.
        Wire.write(0x00 | 0b11);

        // End transmission.
        Wire.endTransmission();
}


/**
 * @brief Displays the contents of each register via the serial bus.
 * @details The last byte is the device ID register, shift it to the right
 * four positions to check what device you have if you can't do it via
 * get_device_id().
 */
void Lumen_Sensor::display_all_registers(void){
    // This is split up like this because the address auto incrementation on the
    // IC does not seem to work or I don't know how to get it to work correctly.
    // Will hold the contents of the device.
    uint8_t data[10];

    // Ask for access to the Lumen sensor
    Wire.beginTransmission(0x29);

    // Command bit = 1
    // 6:4 = 0
    // 3:0 = Register address(0x00)
    Wire.write(1 << 7);

    // End transmission.
    Wire.endTransmission();

    // Request a byte from device 0x29 (lumen meter).
    Wire.requestFrom(0x29, 0x01);

    // Get the return data.
    data[0] = Wire.read();

    //==========

    // Ask for access to the Lumen sensor
    Wire.beginTransmission(0x29);

    // Command bit = 1
    // 6:4 = 0
    // 3:0 = Register address(0x00)
    Wire.write((1 << 7) | 0x01);

    // End transmission.
    Wire.endTransmission();

    // Request a byte from device 0x29 (lumen meter).
    Wire.requestFrom(0x29, 0x01);

    // Get the return data.
    data[1] = Wire.read();

    //==========

    // Ask for access to the Lumen sensor
    Wire.beginTransmission(0x29);

    // Command bit = 1
    // 6:4 = 0
    // 3:0 = Register address(0x00)
    Wire.write((1 << 7) | 0x04);

    // End transmission.
    Wire.endTransmission();

    // Request a byte from device 0x29 (lumen meter).
    Wire.requestFrom(0x29, 0x01);

    // Get the return data.
    data[2] = Wire.read();

    //==========

    // Ask for access to the Lumen sensor
    Wire.beginTransmission(0x29);

    // Command bit = 1
    // 6:4 = 0
    // 3:0 = Register address(0x00)
    Wire.write((1 << 7) | 0x05);

    // End transmission.
    Wire.endTransmission();

    // Request a byte from device 0x29 (lumen meter).
    Wire.requestFrom(0x29, 0x01);

    // Get the return data.
    data[3] = Wire.read();

    //==========

    // Ask for access to the Lumen sensor
    Wire.beginTransmission(0x29);

    // Command bit = 1
    // 6:4 = 0
    // 3:0 = Register address(0x00)
    Wire.write((1 << 7) | 0x0A);

    // End transmission.
    Wire.endTransmission();

    // Request a byte from device 0x29 (lumen meter).
    Wire.requestFrom(0x29, 0x01);

    // Get the return data.
    data[4] = Wire.read();

    // And now we display it all to the serial port.
    Serial.println("TSL45315 registers: ");
    Serial.print("  CONTROL(0x00): ");
    Serial.println(data[0]);
    Serial.print("  CONFIG(0x01): ");
    Serial.println(data[1]);
    Serial.print("  DATALOW(0x04): ");
    Serial.println(data[2]);
    Serial.print("  DATAHIGH(0x05): ");
    Serial.println(data[3]);
    Serial.print("  Device_ID(0x0A): ");
    Serial.print(data[4], HEX);
    Serial.print(" or when converted: ");
    Serial.println(data[4] >> 4, HEX);
}