mic.nc

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// $Id: Mic.nc,v 1.2 2003/10/07 21:46:14 idgay Exp $

/*									tab:4
 * "Copyright (c) 2000-2003 The Regents of the University  of California.  
 * All rights reserved.
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 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
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 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
 *
 * Copyright (c) 2002-2003 Intel Corporation
 * All rights reserved.
 *
 * This file is distributed under the terms in the attached INTEL-LICENSE     
 * file. If you do not find these files, copies can be found by writing to
 * Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300, Berkeley, CA, 
 * 94704.  Attention:  Intel License Inquiry.
 */

/*
 * Authors:		Alec Woo
 * Date last modified:  8/20/02
 * 
 * The microphone on the mica sensor board has two methods for control and
 * one method to read the binary output of the tone detector.  (Note:  The tone
 * detector's binary output can be configured as an interrupt.  Please see MicInterrupt.ti)
 *
 * muxSel allows users to switch the ADC to sample from phase lock loop output of
 * the tone detector (by setting the value to 0 (default))  or the raw voice-band output 
 * of the micrphone (by setting the value to 1).
 *
 * gainAdjust allows users to adjust the amplification gain on the microphone. The range
 * is 0 to 255 with 0 being the minmum and 255 being the maximum amplification.  Note that
 * setting amplification too high can result in clipping (signal distortion).
 *
 * If an audio signal at 4.3kHz is picked up by the microphone, the tone
 * detect will decode it and generate a binary ouput (0 meaning tone is detected, 1 meaning
 * tone is not detected).  Users can read this output simply by calling readToneDetector().
 *
 */

/**
 * @author Alec Woo
 */

interface Mic {
  /* Effect:  Set the multiplexer's setting on the microphone
   * Return:  returns SUCCESS or FAIL
   */
  command result_t muxSel(uint8_t sel);
  /* Effect:  Set the amplificatoin gain  on the microphone
   * Return:  returns SUCCESS or FAIL
   */
  command result_t gainAdjust(uint8_t val);

  /* Effect:  returns the binary tone detector's output
   * Return:  0 meaning tone is detected, 1 meanning tone is not detected
   */
  command uint8_t readToneDetector();
}