micawbadcm.nc

用于传感器网络的节点操作系统 TinyOS 结构设计非常有意思

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/*
 *
 * Authors:	        Joe Polastre
 *
 * $Id: MicaWbADCM.nc,v 1.1 2002/09/11 01:57:06 scipio Exp $
 */

module MicaWbADCM
{
  provides {
    interface StdControl;
    interface ADC[uint8_t port];
  }
  uses interface I2CPacket;
}
implementation
{

  enum {IDLE, SINGLE_PICK_CHANNEL, SINGLE_GET_SAMPLE, SINGLE_GOT_SAMPLE,
	MULT_PICK_CHANNEL};

  char state;       /* current state of the i2c request */
  char addr;        /* destination address */
  char condition;   /* set the condition command byte */
  char flags;       /* flags set on the I2C packets */
  uint16_t value;   /* value of the incoming ADC reading */

  command result_t StdControl.init() {
    state = IDLE;
    return SUCCESS;
  }

  command result_t StdControl.power(char mode) {
    return SUCCESS;
  }

  /* get a single reading from id */
  command result_t ADC.getData[uint8_t id]() {
    if (state == IDLE)
    {
      char channel = id;
      state = SINGLE_PICK_CHANNEL;
      /* figure out which channel is to be set */
      if (channel == 0)
        condition = 8;
      else if (channel == 1)
	condition = 12;
      else if (channel == 2)
	condition = 9;
      else if (channel == 3)
	condition = 13;
      else if (channel == 4)
	condition = 10;
      else if (channel == 5)
	condition = 14;
      else if (channel == 6)
	condition = 11;
      else if (channel == 7)
	condition = 15;
      else
	{
	  /* invalid channel number specified */
	  state = IDLE;
	  return FAIL;
	}
      /* shift the channel and single-ended input bits over */
      condition = (condition << 4) & 0xF0;
      /* don't send the stop condition */
      flags = 0x00;
      /* tell the ADC to start converting */
      if ((call I2CPacket.writePacket(1, (char*)(&condition), flags)) == FAIL)
	{
	  state = IDLE;
	  return FAIL;
	}
      return SUCCESS;
    }
    return FAIL;
  }

  /* not yet implemented */
  command result_t ADC.getContinuousData[uint8_t id]() {
    return FAIL;
  }

  event result_t I2CPacket.readPacketDone(char length, char* data) {
    if (state == SINGLE_GET_SAMPLE)
    {
      state = SINGLE_GOT_SAMPLE;
      value = (data[0] << 8) & 0x0f00;
      value += (data[1] & 0xff);
      state = IDLE;
      signal ADC.dataReady(value);
    }
    return SUCCESS;
  }

  event result_t I2CPacket.writePacketDone(bool result) {
    if (state == SINGLE_PICK_CHANNEL)
    {
      state = SINGLE_GET_SAMPLE;
      flags = 0x03;
      if ((call I2CPacket.readPacket(2, flags)) == 0)
	{
	  /* reading from the bus failed */
	  state = IDLE;
	  signal ADC.dataReady(-1);
	}
      return SUCCESS;
    }
    return SUCCESS;
  }

}