Donatien Garnier / RWDModule

Generic driver for the RWD RFID Modules from IB Technology.

Dependents:   RSEDP_DPDemo

RWDModule.cpp@4:0c21bc193afa, 2010-07-22 (annotated)

Committer:
donatien
Date:
Thu Jul 22 16:24:31 2010 +0000
Revision:
4:0c21bc193afa
Parent:
3:60db4ab4dafe 

        

        
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/*





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Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com)





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Permission is hereby granted, free of charge, to any person obtaining a copy





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of this software and associated documentation files (the "Software"), to deal





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in the Software without restriction, including without limitation the rights





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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell





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copies of the Software, and to permit persons to whom the Software is





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furnished to do so, subject to the following conditions:





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The above copyright notice and this permission notice shall be included in





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all copies or substantial portions of the Software.





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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR





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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,





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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE





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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER





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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,





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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN





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THE SOFTWARE.





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*/





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#include "RWDModule.h"





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RWDModule::RWDModule(PinName tx, PinName rx, PinName cts) : m_serial(tx, rx), m_cts(cts),





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m_cmd(0), m_paramsBuf(NULL), m_respBuf(NULL), m_pos(0), m_paramsLen(0), m_respLen(0), m_ackOk(0), m_ackOkMask(0), m_ack(0), m_state(READY)





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{





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  //Setup baudrate





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  m_serial.baud(9600);





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  //Setup interrupts





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  m_serial.attach(this, &RWDModule::intTx, Serial::TxIrq); //Serial port writeable





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  m_serial.attach(this, &RWDModule::intRx, Serial::RxIrq); //Serial port readable





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  m_cts.fall(this, &RWDModule::intClearToSend); //Clear To Send: can send a command





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}





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RWDModule::~RWDModule()





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{





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}





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void RWDModule::command(uint8_t cmd, const uint8_t* params, int paramsLen, uint8_t* resp, size_t respLen, uint8_t ackOk, size_t ackOkMask) //Ack Byte is not included in the resp buf





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{





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  if(!ready()) //If reader is not ready, does not submit another command yet





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    return;





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  //Setup command





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  m_cmd = cmd;





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  //Setup parameters





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  m_paramsBuf = (uint8_t*) params;





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  m_paramsLen = paramsLen;





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  //Setup response





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  m_respBuf = resp;





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  m_respLen = respLen;





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  //Pos in buf is 0





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  m_pos = 0;





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  //Setup ack requirements





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  m_ackOk = ackOk;





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  m_ackOkMask = ackOkMask;





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  m_state = CMD_QUEUED;





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}





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bool RWDModule::ready()





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{





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  return (m_state==READY);





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}





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bool RWDModule::result(uint8_t* pAck /*= NULL*/)





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{





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  if(!ready()) //Has command returned yet?





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    return false;





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  if(pAck) //If pointer is passed, return reader's ack





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    *pAck = m_ack;





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  return ((m_ack & m_ackOkMask) == m_ackOk); //Return whether the reader returned an error or OK ack





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}





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void RWDModule::intClearToSend()





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{





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  //Start sending command when Clear To Send falls





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  if(m_state == CMD_QUEUED) //Is there a command to be sent?





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  {





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    m_state = SENDING_CMD;





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    intTx(); //Start sending command





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  }





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}





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void RWDModule::intTx()





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{





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  if(m_state != SENDING_CMD)





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    return;  





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  if(m_pos==0) //Must send command-byte first





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    m_serial.putc((char)m_cmd);





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  while(true) //Send payload





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  {





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    if(m_pos >= m_paramsLen) //Payload sent completely?





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    {





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      m_pos = 0;





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      m_state = WAITING_FOR_ACK; //Next step





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      return;





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    }





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    m_serial.putc((char)m_paramsBuf[m_pos]); //Send payload byte





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    m_pos++;





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  }





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}





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void RWDModule::intRx()





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{





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  if(m_state == WAITING_FOR_ACK) //Get answer





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  {





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    m_ack = m_serial.getc(); //Get Ack





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    if( (m_ack & m_ackOkMask) != m_ackOk ) //Check if an error is returned





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    {





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      m_state = READY; //If yes, transfer is completed and result() will return false





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      return;





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    }





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    if(m_respLen)





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    {





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      m_state = RECEIVING_ACK; //Ack OK, now need to get response





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    }





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    else





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    {





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      m_state = READY; //Ack OK, end of transfer





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      return;





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    }





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  }





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  if(m_state != RECEIVING_ACK) //Error, should not happen





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  {





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    while(m_serial.readable())





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      m_serial.getc(); //Dump these bytes





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    return; 





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  }





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  while(m_serial.readable()) //Read payload





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  {





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    m_respBuf[m_pos] = (uint8_t) m_serial.getc(); //Read byte and put it in resp buf





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    m_pos++;





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    if(m_pos >= m_respLen)





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    {





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      m_pos = 0;





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      m_state = READY; //End of transfer, response retrieved with success





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    }





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  }





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}