t6004readerp.nc

tinyos2.0版本驱动

/***本程序为T6004 CO2 传感器组件
 *@author Majy & Lizm
 *@data 2008-09-27
 */

module T6004ReaderP
{
  provides interface Read<uint16_t> as T6004Reader;
  
  uses interface StdControl as Uart0Control;//对Uart0的控制
  uses interface UartStream as Uart0Stream;
}
implementation
{

  const uint16_t crc_tab[256]= //CRC校验表
  {
	0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
	0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
	0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
	0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
	0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
	0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
	0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
	0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
	0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
	0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
	0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
	0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
	0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
	0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
	0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
	0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
	0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
	0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
	0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
	0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
	0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
	0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
	0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
	0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
	0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
	0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
	0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
	0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
	0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
	0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
	0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
	0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
  };

  /* Enum and variables */
  enum {
    STATE_IDLE,
    STATE_BUSY,
  };

  enum {
    WAIT_FOR_FIRST_PREAMBLE,
    WAIT_FOR_SECOND_PREAMBLE,
    WAIT_FOR_ADDRESS,
    WAIT_FOR_LENGTH,
    WAIT_FOR_DATA,
  };

  uint8_t sendCmdBuff[4]={0x02,0x03};
  uint8_t receiveDataBuff[16];

  uint8_t sendPacketBuff[16];
  uint8_t receivePacketBuff[20];

  uint8_t read_length;
  norace uint8_t receive_pos;
  norace uint8_t receive_machine_state;
  uint16_t sendPacketLen; 
  norace uint8_t mState;
  uint16_t CO2Data;


   /* Functions arear*/
   /**
   * TODO: Reduce the computation by compute all command packet in prior.
   * 
   * @param wAccum
   * @param byte 
   * @return 
   */
  uint16_t calc_CRC(uint16_t wAccum, uint8_t byte) {
    uint8_t index = (uint8_t)(wAccum>>8) ^ byte;
    uint16_t temp=crc_tab[index];
    return ( wAccum << 8 ) ^ temp;
  }

  /**
   * Frame data to lower packet format of CO2 6004.
   * TODO: Check the length in case of buffer overflow.
   * 
   * @param sendData The pointer of sending buffer.
   * @param sdLen The send data buffer length.
   * @param sendpacket The pointer of framed packet.
   * @param spLen The send packet buffer length.
   * @return Framed packet length.
   */
  uint8_t assemble_packet(uint8_t *sendData, uint8_t sdLen, uint8_t *sendPacket, uint8_t spLen) {
	uint8_t j = 0;
	uint8_t i;
	uint16_t wCrc;
	sendPacket[j++] = 0xff;
	sendPacket[j++] = 0xff;     //前导码
	sendPacket[j++] = 0xfe;	//地址，所有命令都一样
	wCrc = calc_CRC(0,0xfe);
	sendPacket[j++] = (uint8_t)sdLen; //长度
	if (sdLen == 0xff)
	{
		sendPacket[j++] = 0;
	}
	wCrc = calc_CRC(wCrc,sdLen);
	for (i = 0; i < sdLen; i++)
	{
		sendPacket[j++] = sendData[i];
		wCrc = calc_CRC(wCrc,sendData[i]);
		if (sendData[i] == 0xff) 
		{
			sendPacket[j++] = 0; // No CRC on transport material
		}
	}
	sendPacket[j++] = (uint8_t)wCrc;
	if (sendPacket[j-1] == 0xff)
	{
		sendPacket[j++] = 0;
	}
	sendPacket[j++] = (uint8_t)((wCrc & 0xFF00)>>8);
	if (sendPacket[j-1] == 0xff)
	{
		sendPacket[j++] = 0;
	}
	
        return j;
  }

  /**
   * Extract data from lower packet format of CO2 6004.
   * TODO: Check the length in case of buffer overflow.
   * 
   * @param receivePacket The pointer of received buffer.
   * @param rpLen The received packet buffer length.
   * @param receiveData The pointer of data buffer. 
   * @param rdLen The received data buffer length.
   * @return Received data length.
   */
  inline int16_t parse_packet(uint8_t * receivePacket, uint8_t rpLen, uint8_t * receiveData, uint8_t rdLen) {
	uint8_t j = 0;
	uint8_t i = 0;
	int16_t len;
	uint16_t crc;
	
        if(  receivePacket[i++]  != 0xFA ) return -1;
	crc = calc_CRC(0,receivePacket[i-1]);
	len = receivePacket[i++];
	crc = calc_CRC(crc,receivePacket[i-1]);
	while( j < len )
	{
		if( (receiveData[j++] = receivePacket[i++]) == 0xff ) i++;
		crc = calc_CRC(crc,receiveData[j-1]);
	}

	if( (uint8_t)crc != receivePacket[i++] ) return -1;
	if( receivePacket[i-1] == 0xff ) i++;
	if( (uint8_t)(crc >> 8) != receivePacket[i++] )  return -1;  //不能return 0 因为应答包的长度为0

	return len;
  }

  /**
   * Initialization.
   * 
   */
  void init() 
  {
    mState = STATE_IDLE;
    receive_machine_state = WAIT_FOR_FIRST_PREAMBLE;
    receive_pos = 0;
    sendPacketLen = assemble_packet(sendCmdBuff, 2, sendPacketBuff, 16);
    call Uart0Control.start();
  }

  command error_t T6004Reader.read()
  {
      error_t error;
      
      init();       
      mState = STATE_BUSY;       
      error = call Uart0Stream.send(sendPacketBuff, sendPacketLen);//发送采集命令 @lzm
      if (error == SUCCESS) 
      {
        //call Leds.led0Toggle();
        return SUCCESS;
      } 
      else 
      {
        mState = STATE_IDLE;
        return FALSE;
      }
      //return SUCCESS;
      
  }
 
  /* Tasks */
  task void ParsePacket() 
  {
    int16_t length = 0;
    uint8_t tmp1;
    uint8_t tmp2;
    
    //call Leds.led2Toggle();
    length = parse_packet(receivePacketBuff, 20, receiveDataBuff, 16);
    if( length != -1 ) 
    {
      
      tmp1 = (uint16_t)receiveDataBuff[0];//tmp1 is the low bits of sensor data
      tmp2 = (uint16_t)receiveDataBuff[1];//tmp2 is the higt bits of sensor data
      CO2Data = (tmp2<<8)|tmp1;
    } 
    else 
    {
      mState = STATE_IDLE;
    }
    signal T6004Reader.readDone(SUCCESS, CO2Data);
    return;
  }
  
  /* UartStream events implementation */
  /**
   * Signal completion of sending a stream.
   *
   * @param 'uint8_t* COUNT(len) buf' Bytes sent.
   * @param len Number of bytes sent.
   * @param error SUCCESS if the transmission was successful, FAIL otherwise.
   */
  async event void Uart0Stream.sendDone( uint8_t* buf, uint16_t len, error_t error ) 
  {
    if (error == SUCCESS) 
    {
      //call Leds.led0Toggle();
    } 
    else 
    {
      mState = STATE_IDLE;
      //signal T6004Reader.readDone(FALSE, CO2Data);
    }
  }

  /**
   * Signals the receipt of a byte.
   *
   * @param byte The byte received.
   */
  async event void Uart0Stream.receivedByte( uint8_t byte ) //中断触发此事件 @lzm
  {
    //call Leds.led1Toggle();
	switch (receive_machine_state)
	{
		case WAIT_FOR_FIRST_PREAMBLE:
			if (byte == 0xFF)
			{
				receive_machine_state = WAIT_FOR_SECOND_PREAMBLE;
			}
			break;
		case WAIT_FOR_SECOND_PREAMBLE:
			if (byte == 0xFF)
			{
				receive_machine_state = WAIT_FOR_ADDRESS;
			}
			else
			{
				receive_machine_state = WAIT_FOR_FIRST_PREAMBLE;
			}
			break;
		case WAIT_FOR_ADDRESS:
			receivePacketBuff[receive_pos] = byte;
			if( receivePacketBuff[receive_pos] == 0XFA )
			{
				receive_machine_state = WAIT_FOR_LENGTH;
				receive_pos++;
			}
			else
			{
				receive_machine_state = WAIT_FOR_FIRST_PREAMBLE;
			}
			break;
		case WAIT_FOR_LENGTH:
			read_length = byte;
			receivePacketBuff[receive_pos] = read_length; 
			receive_pos++;
			read_length += 2;  //加两个字节crc
			receive_machine_state = WAIT_FOR_DATA;
			break;
		case WAIT_FOR_DATA:
			receivePacketBuff[receive_pos] = byte;
			//if( receivePacketBuff[receive_pos] != 0xff ) read_length--;
			//receive_pos++;
			if(!((receivePacketBuff[receive_pos]==0x00)&&(receivePacketBuff[receive_pos-1]==0xff))) //jia
		        {
				read_length--;
				receive_pos++;
			}  //jia
			if(receive_pos >= 16 ) receive_pos = 0;
			if(read_length == 0) 
			{
			  post ParsePacket();
			/*	if( (length=parse_packet(receivePacketBuff, receiveData)) != -1 ) {	
				   receiveSuccess = SUCCESS;
				} else {
				  receiveSuccess=FAIL;
				}
			*/
				receive_pos = 0;
				receive_machine_state = WAIT_FOR_FIRST_PREAMBLE;
			}  
			break;
	}
    
  }
  
  /**
   * Signal completion of receiving a stream.
   *
   * @param 'uint8_t* COUNT(len) buf' Buffer for bytes received.
   * @param len Number of bytes received.
   * @param error SUCCESS if the reception was successful, FAIL otherwise.
   */
  async event void Uart0Stream.receiveDone( uint8_t* buf, uint16_t len, error_t error ) {}
  
  default event void T6004Reader.readDone(error_t error, uint16_t val) 
  {
	if(error == FALSE)
	{
		val = 0x2222;
	}
    return;
  }

}