atm128adcsingle.nc

来自「tinyos-2.0源代码！转载而已！要的尽管拿！」· NC 代码 · 共 84 行

/// $Id: Atm128AdcSingle.nc,v 1.1.2.4 2006/02/17 00:26:47 idgay Exp $

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/**
 * Hardware Abstraction Layer interface of Atmega128 for acquiring
 * a single sample from a channel.
 *
 * @author Hu Siquan <[e-mail]>
 * @author David Gay
 */

#include "Atm128Adc.h"

interface Atm128AdcSingle
{
  /**
   * Initiates an ADC conversion on a given channel.
   *
   * @param channel A/D conversion channel.
   * @param refVoltage Select reference voltage for A/D conversion. See
   *   the ATM128_ADC_VREF_xxx constants in Atm128ADC.h
   * @param leftJustify TRUE to place A/D result in high-order bits 
   *   (i.e., shifted left by 6 bits), low to place it in the low-order bits
   * @param prescaler Prescaler value for the A/D conversion clock. If you 
   *  specify ATM128_ADC_PRESCALE, a prescaler will be chosen that guarantees
   *  full precision. Other prescalers can be used to get faster conversions. 
   *  See the ATmega128 manual for details.
   * @return TRUE if the conversion will be precise, FALSE if it will be 
   *   imprecise (due to a change in refernce voltage, or switching to a
   *   differential input channel)
   */
  async command bool getData(uint8_t channel, uint8_t refVoltage,
			     bool leftJustify, uint8_t prescaler);
  
  /**
   * Indicates a sample has been recorded by the ADC as the result
   * of a <code>getData()</code> command.
   *
   * @param data a 2 byte unsigned data value sampled by the ADC.
   * @param precise if the conversion precise, FALSE if it wasn't. This
   *   values matches the result from the <code>getData</code> call.
   */	
  async event void dataReady(uint16_t data, bool precise);

  /**
   * Cancel an outstanding getData operation. Use with care, to
   * avoid problems with races between the dataReady event and cancel.
   * @return TRUE if a conversion was in-progress or an interrupt
   *   was pending. dataReady will not be signaled. FALSE if the
   *   conversion was already complete. dataReady will be (or has
   *   already been) signaled.
   */
  async command bool cancel();
}