// $Id: SenseLightToLogM.nc,v 1.3 2003/10/07 21:44:59 idgay Exp $/*									tab:4 * "Copyright (c) 2000-2003 The Regents of the University  of California.   * 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 following * two paragraphs and the author appear in all copies of this software. *  * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *  * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO * 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. *//**  * Implementation for SenseLightToLog module. When a command to start  * sensing is received, it periodically samples the light sensor for  * N samples and stores them in the EEPROM. Once N samples have been  * collected, the timer is turned off and a send done event is posted. * */module SenseLightToLogM {  provides interface StdControl;  provides interface Sensing;  uses {    interface ADC;    interface StdControl as SubControl;    interface Leds;    interface Timer as Timer;    interface LoggerWrite;    interface ProcessCmd as CmdExecute;  }}implementation{  enum {    maxdata = 8  // Circular buffer size  };  // declare module static variables here  char head;              // index to the head of the circular buffer  uint8_t currentBuffer;  // current index to the circular double buffer  int data[maxdata*2];    // circular double buffer  int *bufferPtr[2];      // two pointers to the double buffer  short nsamples;         // number of samples /**   * Initialize the application.    * @return Initialization status.   **/  command result_t StdControl.init() {    atomic {      head = 0;      currentBuffer = 0;      bufferPtr[0] = &(data[0]);      bufferPtr[1] = &(data[8]);    }    return rcombine(call SubControl.init(), call Leds.init());  }  /**   * Start the application.    * @return Start status.   **/  command result_t StdControl.start() {    return call SubControl.start();  }  /**   * Stop the application.    * @return Stop status.   **/  command result_t StdControl.stop() {    return call SubControl.stop();  }   /**   * This command belongs to the <code>Sensing</code> interface.   * It starts the timer to generate periodic events.   *   * @return Always returns <code>SUCCESS</code>   **/  command result_t Sensing.start(int samples, int interval_ms) {    nsamples = samples;    //call Leds.yellowOff();    call Timer.start(TIMER_REPEAT, interval_ms);    return SUCCESS;  }  /**   * Event handler to the <code>Timer.fired</code> event.     * @return Always returns <code>SUCCESS</code>    **/  event result_t Timer.fired() {    nsamples--;    if (nsamples== 0) {      // Stop the timer      call Timer.stop();      signal Sensing.done();    }    call Leds.redToggle();    call ADC.getData();    return SUCCESS;  }  /**   * Default event handler to the <code>Sensing.done</code> event.    * @return Always returns <code>SUCCESS</code>    **/  default event result_t Sensing.done() {    return SUCCESS;  }  task void writeTask() {    char* ptr;    atomic {      ptr = (char*)bufferPtr[currentBuffer];      currentBuffer ^= 0x01;    }    call LoggerWrite.append(ptr);  }    /**   * Event handler to the <code>ADC.dataReady</code> event.   *    * Store the reading in the buffer, when the buffer fills up,    * write it out to the logger, and switch to another circular buffer.     * @return Always returns <code>SUCCESS</code>    **/  async event result_t ADC.dataReady(uint16_t this_data){    atomic {      int p = head;      bufferPtr[currentBuffer][p] = this_data;      head = (p+1);      if (head == maxdata) head = 0;      if (head == 0) {	post writeTask();      }    }    return SUCCESS;  }  /**   * Event handler for the <code>LoggerWrite.writeDone</code> event.   * Toggle the yellow LED if status is true.   *   * @return Always returns <code>SUCCESS</code>    **/  event result_t LoggerWrite.writeDone( result_t status ) {    //if (status) call Leds.yellowOn();    return SUCCESS;  }  /**   * Event handler to the <code>CmdExecute.done</code> event. Do nothing.    * @return Always returns <code>SUCCESS</code>    **/  event result_t CmdExecute.done(TOS_MsgPtr pmsg, result_t status ) {    return SUCCESS;  } }