Generic driver for the RWD RFID Modules from IB Technology.
RWDModule.cpp
- Committer:
- donatien
- Date:
- 2010-07-22
- Revision:
- 4:0c21bc193afa
- Parent:
- 3:60db4ab4dafe
File content as of revision 4:0c21bc193afa:
/* Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com) Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include "RWDModule.h" RWDModule::RWDModule(PinName tx, PinName rx, PinName cts) : m_serial(tx, rx), m_cts(cts), 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) { //Setup baudrate m_serial.baud(9600); //Setup interrupts m_serial.attach(this, &RWDModule::intTx, Serial::TxIrq); //Serial port writeable m_serial.attach(this, &RWDModule::intRx, Serial::RxIrq); //Serial port readable m_cts.fall(this, &RWDModule::intClearToSend); //Clear To Send: can send a command } RWDModule::~RWDModule() { } 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 { if(!ready()) //If reader is not ready, does not submit another command yet return; //Setup command m_cmd = cmd; //Setup parameters m_paramsBuf = (uint8_t*) params; m_paramsLen = paramsLen; //Setup response m_respBuf = resp; m_respLen = respLen; //Pos in buf is 0 m_pos = 0; //Setup ack requirements m_ackOk = ackOk; m_ackOkMask = ackOkMask; m_state = CMD_QUEUED; } bool RWDModule::ready() { return (m_state==READY); } bool RWDModule::result(uint8_t* pAck /*= NULL*/) { if(!ready()) //Has command returned yet? return false; if(pAck) //If pointer is passed, return reader's ack *pAck = m_ack; return ((m_ack & m_ackOkMask) == m_ackOk); //Return whether the reader returned an error or OK ack } void RWDModule::intClearToSend() { //Start sending command when Clear To Send falls if(m_state == CMD_QUEUED) //Is there a command to be sent? { m_state = SENDING_CMD; intTx(); //Start sending command } } void RWDModule::intTx() { if(m_state != SENDING_CMD) return; if(m_pos==0) //Must send command-byte first m_serial.putc((char)m_cmd); while(true) //Send payload { if(m_pos >= m_paramsLen) //Payload sent completely? { m_pos = 0; m_state = WAITING_FOR_ACK; //Next step return; } m_serial.putc((char)m_paramsBuf[m_pos]); //Send payload byte m_pos++; } } void RWDModule::intRx() { if(m_state == WAITING_FOR_ACK) //Get answer { m_ack = m_serial.getc(); //Get Ack if( (m_ack & m_ackOkMask) != m_ackOk ) //Check if an error is returned { m_state = READY; //If yes, transfer is completed and result() will return false return; } if(m_respLen) { m_state = RECEIVING_ACK; //Ack OK, now need to get response } else { m_state = READY; //Ack OK, end of transfer return; } } if(m_state != RECEIVING_ACK) //Error, should not happen { while(m_serial.readable()) m_serial.getc(); //Dump these bytes return; } while(m_serial.readable()) //Read payload { m_respBuf[m_pos] = (uint8_t) m_serial.getc(); //Read byte and put it in resp buf m_pos++; if(m_pos >= m_respLen) { m_pos = 0; m_state = READY; //End of transfer, response retrieved with success } } }