softcapturep.nc

tinyos2.0版本驱动

// $Id: SoftCaptureP.nc,v 1.6 2008/06/11 00:46:24 razvanm Exp $

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/**
 * Emulates GPIO capture functionality using GpioInterrupt and the 
 * standard 32khz counter
 *
 * @author Phil Buonadonna
 */
generic module SoftCaptureP ()
{
  provides interface GpioCapture;
  uses {
    interface GpioInterrupt;
    interface Counter<T32khz,uint32_t> as Counter32khz32;
  }
}

implementation 
{

  async command error_t GpioCapture.captureRisingEdge() {
    return (call GpioInterrupt.enableRisingEdge());
  }

  async command error_t GpioCapture.captureFallingEdge() {
    return (call GpioInterrupt.enableFallingEdge());
  }

  async command void GpioCapture.disable() {
    call GpioInterrupt.disable();
    return;
  }
  
  async event void GpioInterrupt.fired() {
    uint16_t captureTime;

    captureTime = (uint16_t) call Counter32khz32.get();
    signal GpioCapture.captured(captureTime);
    return;
  }

  async event void Counter32khz32.overflow() {
    return;
  }

  default async event void GpioCapture.captured(uint16_t time) {
    return;
  }
}