haltmp175readerp.nc

tinyos2.0版本驱动

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/**
 * HalTMP175ReaderP provides the service level HIL and device
 * specific Hal interfaces for the TI TMP175 Chip.
 *
 * Note that only the data path uses split phase resource arbitration
 * 
 * @author Phil Buonadonna <[e-mail]>
 * @version $Revision: 1.4 $ $Date: 2006/12/12 18:23:14 $
 */

generic module HalTMP175ReaderP()
{
  provides interface Read<uint16_t> as Temperature;

  uses interface HplTMP175;
  uses interface Resource as TMP175Resource;
}

implementation {

  enum {
    STATE_SET_MODE,
    STATE_SET_POLARITY,
    STATE_SET_FQ,
    STATE_SET_RES,
    STATE_NONE
  };

  uint8_t mState = STATE_NONE;
  uint8_t mConfigRegVal = 0;
  error_t mHplError;

  command error_t Temperature.read() {
    return call TMP175Resource.request();
  }

  event void TMP175Resource.granted() {
    error_t error;
    
    error = call HplTMP175.measureTemperature();
    if (error) {
      call TMP175Resource.release();
      signal Temperature.readDone(error,0);
    }
    return;
  }

  async event void HplTMP175.measureTemperatureDone(error_t tmp175_error, uint16_t val) {
    call TMP175Resource.release();
    signal Temperature.readDone(tmp175_error,(val >> 4));
    return;
  }

  // intentionally left empty
  async event void HplTMP175.setTLowRegDone(error_t error) {}
  async event void HplTMP175.setTHighRegDone(error_t error) {}
  async event void HplTMP175.setConfigRegDone(error_t error) {}
  async event void HplTMP175.alertThreshold() {}

  default event void Temperature.readDone(error_t error, uint16_t val) {return ;}

}