voltagep.nc

tinyos-2.x.rar

/* Copyright (c) 2007 Johns Hopkins University.
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose, without fee, and without written
 * agreement is hereby granted, provided that the above copyright
 * notice, the (updated) modification history and the author appear in
 * all copies of this source code.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS  `AS IS'
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, LOSS OF USE, DATA,
 * OR PROFITS) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
/**
 * Battery Voltage. The returned value represents the difference
 * between the battery voltage and V_BG (1.23V). The formula to convert
 * it to mV is: 1223 * 1024 / value.
 *
 * @author Razvan Musaloiu-E.
 */
module VoltageP
{
  provides interface Atm128AdcConfig;
}
implementation
{
  async command uint8_t Atm128AdcConfig.getChannel()
  {
    // select the 1.23V (V_BG). Reference: Table 97, page 244 from the Atmega128
    return ATM128_ADC_SNGL_1_23;
  }

  async command uint8_t Atm128AdcConfig.getRefVoltage()
  {
    return ATM128_ADC_VREF_OFF;
  }

  async command uint8_t Atm128AdcConfig.getPrescaler()
  {
    return ATM128_ADC_PRESCALE;
  }
}