SerRelayBoard.cpp

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/****************************************************************
 *
 * Copyright (c) 2010
 *
 * Fraunhofer Institute for Manufacturing Engineering   
 * and Automation (IPA)
 *
 * +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 *
 * Project name: care-o-bot
 * ROS stack name: cob_driver
 * ROS package name: cob_relayboard
 * Description: Class for communication with relayboard. The relayboard is mainly used for reading the Emergencystop and Laserscannerstop states.
 *                                                              
 * +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 *                      
 * Author: Philipp Koehler
 * Supervised by: Christian Connette, email:christian.connette@ipa.fhg.de
 *
 * Date of creation: March 2010
 * ToDo:
 *
 * +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Fraunhofer Institute for Manufacturing 
 *       Engineering and Automation (IPA) nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License LGPL as 
 * published by the Free Software Foundation, either version 3 of the 
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License LGPL for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public 
 * License LGPL along with this program. 
 * If not, see <http://www.gnu.org/licenses/>.
 *
 ****************************************************************/


#include <math.h>
#include <cob_relayboard/SerRelayBoard.h>

//-----------------------------------------------


// #define NUM_BYTE_SEND 79 //Total amount of data sent to relayboard in one message, is now passed and set as protocol-version argument in constructor

#define RS422_BAUDRATE 420000
#define RS422_RX_BUFFERSIZE 1024
#define RS422_TX_BUFFERSIZE 1024

#define RS422_TIMEOUT 0.025

#define NUM_BYTE_REC_MAX 120
#define NUM_BYTE_REC_HEADER 4 //Header bytes, which are used to identify the beginning of a new received message {0x02, 0x80, 0xD6, 0x02}
#define NUM_BYTE_REC_CHECKSUM 2 //checksum for message, that is built as the sum of all data bytes contained in the message
#define NUM_BYTE_REC 104 //Total amount of data bytes in a received message (from the relayboard)


//-----------------------------------------------
SerRelayBoard::SerRelayBoard(std::string ComPort, int ProtocolVersion)
{
        m_iProtocolVersion = ProtocolVersion;
        if(m_iProtocolVersion == 1)
                m_NUM_BYTE_SEND = 50;
        else if(m_iProtocolVersion == 2)
                m_NUM_BYTE_SEND = 79;
        else
                m_NUM_BYTE_SEND = 50;

        m_bComInit = false;
        m_sNumComPort = ComPort;

        m_iRelBoardBattVoltage = 0;
        m_iConfigRelayBoard = 0;
        m_iRelBoardKeyPad = 0xFFFF;
        m_iCmdRelayBoard = 0;
        m_iDigIn = 0;
}

//-----------------------------------------------
SerRelayBoard::~SerRelayBoard()
{
        m_SerIO.close();
}

//-----------------------------------------------
int SerRelayBoard::evalRxBuffer()
{
        static int siNoMsgCnt = 0;
        
        const int c_iNrBytesMin = NUM_BYTE_REC_HEADER + NUM_BYTE_REC + NUM_BYTE_REC_CHECKSUM;
        const int c_iSizeBuffer = 4096;

        int i;
        int errorFlag = NO_ERROR;
        int iNrBytesInQueue, iNrBytesRead, iDataStart;
        unsigned char cDat[c_iSizeBuffer];
        unsigned char cTest[4] = {0x02, 0x80, 0xD6, 0x02};

        if( !m_bComInit ) return NOT_INITIALIZED;

        //enough data in queue?
        iNrBytesInQueue = m_SerIO.getSizeRXQueue();
        if(iNrBytesInQueue < c_iNrBytesMin)
        {
                //there are too less bytes in queue
                siNoMsgCnt++;
                if(siNoMsgCnt > 29)
                {
                        //std::cerr << "Relayboard: " << siNoMsgCnt << " cycles no msg received";
                        siNoMsgCnt = 0;
                        errorFlag = NO_MESSAGES;
                } else errorFlag = TOO_LESS_BYTES_IN_QUEUE;
                
                return errorFlag;
        }
        else
        {
                siNoMsgCnt = 0;
        }

        // search most recent data from back of queue
        iNrBytesRead = m_SerIO.readBlocking((char*)&cDat[0], iNrBytesInQueue);
        for(i = (iNrBytesRead - c_iNrBytesMin); i >= 0 ; i--)
        {
                //try to find start bytes
                if((cDat[i] == cTest[0]) && (cDat[i+1] == cTest[1]) && (cDat[i+2] == cTest[2]) && (cDat[i+3] == cTest[3]))
                {
                        iDataStart = i + 4;

                        // checksum ok?
                        if( convRecMsgToData(&cDat[iDataStart]) )
                        {
                                return errorFlag;
                        }
                        else
                        {
                                //std::cerr << "Relayboard: checksum error";
                                errorFlag = CHECKSUM_ERROR;
                                return errorFlag;
                        }
                }
        }

        return errorFlag;
}

//-----------------------------------------------
bool SerRelayBoard::init()
{
        int iRet;
        
        m_SerIO.setBaudRate(RS422_BAUDRATE);
        m_SerIO.setDeviceName( m_sNumComPort.c_str() );
        m_SerIO.setBufferSize(RS422_RX_BUFFERSIZE, RS422_TX_BUFFERSIZE);
        m_SerIO.setTimeout(RS422_TIMEOUT);

        iRet = m_SerIO.open();

        m_bComInit = true;

        return true;
}

//-----------------------------------------------
bool SerRelayBoard::reset()
{
        m_SerIO.close();
        m_bComInit = false;

        init();

        return true;
}

//-----------------------------------------------
bool SerRelayBoard::shutdown()
{
        m_SerIO.close();

        m_bComInit = false;
        
        return true;
}


//-----------------------------------------------
bool SerRelayBoard::isEMStop()
{
        if( (m_iRelBoardStatus & 0x0001) != 0)
        {
                return true;
        }
        else
        {
                return false;
        }
}

//-----------------------------------------------
bool SerRelayBoard::isScannerStop()
{
        if( (m_iRelBoardStatus & 0x0002) != 0)
        {
                return true;
        }
        else
        {
                return false;
        }
}

//-----------------------------------------------
int SerRelayBoard::sendRequest() {
        int errorFlag = NO_ERROR;
        int iNrBytesWritten;

        unsigned char cMsg[m_NUM_BYTE_SEND];
        
        m_Mutex.lock();
        
                convDataToSendMsg(cMsg);

                m_SerIO.purgeTx();

                iNrBytesWritten = m_SerIO.write((char*)cMsg, m_NUM_BYTE_SEND);
        
                if(iNrBytesWritten < m_NUM_BYTE_SEND) {
                        //std::cerr << "Error in sending message to Relayboard over SerialIO, lost bytes during writing" << std::endl;
                        errorFlag = GENERAL_SENDING_ERROR;
                }

        m_Mutex.unlock();

        return errorFlag;
}

int SerRelayBoard::setDigOut(int iChannel, bool bOn)
{
        switch( iChannel)
        {
        case 0:

                if(bOn) { m_iCmdRelayBoard |= CMD_SET_CHARGE_RELAY; }
                else { m_iCmdRelayBoard &= ~CMD_SET_CHARGE_RELAY; }
                
                break;

        case 1:

                if(bOn) { m_iCmdRelayBoard |= CMD_SET_RELAY1; }
                else { m_iCmdRelayBoard &= ~CMD_SET_RELAY1; }

                break;

        case 2:

                if(bOn) { m_iCmdRelayBoard |= CMD_SET_RELAY2; }
                else { m_iCmdRelayBoard &= ~CMD_SET_RELAY2; }

                break;

        case 3:

                if(bOn) { m_iCmdRelayBoard |= CMD_SET_RELAY3; }
                else { m_iCmdRelayBoard &= ~CMD_SET_RELAY3; }

                break;

        case 4:

                if(bOn) { m_iCmdRelayBoard |= CMD_SET_RELAY4; }
                else { m_iCmdRelayBoard &= ~CMD_SET_RELAY4; }

                break;

        case 5:

                if(bOn) { m_iCmdRelayBoard |= CMD_SET_RELAY5; }
                else { m_iCmdRelayBoard &= ~CMD_SET_RELAY5; }

                break;

        case 6:

                if(bOn) { m_iCmdRelayBoard |= CMD_SET_RELAY6; }
                else { m_iCmdRelayBoard &= ~CMD_SET_RELAY6; }

                break;

        default:

                return -1;
        }
        
        return 0;
}
//-----------------------------------------------
int SerRelayBoard::getAnalogIn(int* piAnalogIn)
{
        piAnalogIn[0] = m_iChargeCurrent;
        piAnalogIn[1] = m_iRelBoardBattVoltage;
        piAnalogIn[2] = m_iRelBoardTempSensor;
        piAnalogIn[3] = m_iRelBoardKeyPad;
        piAnalogIn[4] = m_iRelBoardAnalogIn[0];
        piAnalogIn[5] = m_iRelBoardAnalogIn[1];
        piAnalogIn[6] = m_iRelBoardAnalogIn[2];
        piAnalogIn[7] = m_iRelBoardAnalogIn[3];

        return 0;
}

//-----------------------------------------------
int SerRelayBoard::getDigIn()
{
        return m_iDigIn;
}

//-----------------------------------------------
void SerRelayBoard::convDataToSendMsg(unsigned char cMsg[])
{
        int i;
        int iCnt = 0;
        int iChkSum = 0;

        cMsg[iCnt++] = 1;//CMD_RELAISBOARD_GET_DATA;

        cMsg[iCnt++] = m_iConfigRelayBoard >> 8;
        cMsg[iCnt++] = m_iConfigRelayBoard;

        cMsg[iCnt++] = m_iCmdRelayBoard >> 8;
        cMsg[iCnt++] = m_iCmdRelayBoard;
        
        // fill remaining msg with 0's
        do
        {
                cMsg[iCnt++] = 0;
        }
        while(iCnt < (m_NUM_BYTE_SEND - 2));

        // calc checksum: summation of all bytes in the message
        for(i = 0; i < (m_NUM_BYTE_SEND - 2); i++)
        {
                iChkSum += cMsg[i];
        }

        cMsg[m_NUM_BYTE_SEND - 2] = iChkSum >> 8;
        cMsg[m_NUM_BYTE_SEND - 1] = iChkSum;

        // reset flags
        m_iCmdRelayBoard &= ~CMD_RESET_POS_CNT;
}

//-----------------------------------------------
bool SerRelayBoard::convRecMsgToData(unsigned char cMsg[])
{
        const int c_iStartCheckSum = NUM_BYTE_REC;
        
        int i;
        unsigned int iTxCheckSum;
        unsigned int iCheckSum;

        m_Mutex.lock();

        // test checksum: checksum should be sum of all bytes
        iTxCheckSum = (cMsg[c_iStartCheckSum + 1] << 8) | cMsg[c_iStartCheckSum];
        
        iCheckSum = 0;
        for(i = 0; i < c_iStartCheckSum; i++)
        {
                iCheckSum += cMsg[i];
        }

        if(iCheckSum != iTxCheckSum)
        {
                return false;
        }

        // convert data
        int iCnt = 0;

        //RelayboardStatus bytes contain EM-Stop and Scanner-Stop bits
        m_iRelBoardStatus = (cMsg[iCnt + 1] << 8) | cMsg[iCnt];
        iCnt += 2;

        //unused at the moment
        m_iChargeCurrent = (cMsg[iCnt + 1] << 8) | cMsg[iCnt];
        iCnt += 2;

        //unused at the moment
        m_iRelBoardBattVoltage = (cMsg[iCnt + 1] << 8) | cMsg[iCnt];
        iCnt += 2;

        //unused at the moment  
        m_iRelBoardKeyPad = (cMsg[iCnt + 1] << 8) | cMsg[iCnt];
        iCnt += 2;

        //unused at the moment
        for(i = 0; i < 4; i++)
        {
                m_iRelBoardAnalogIn[i] = (cMsg[iCnt + 1] << 8) | cMsg[iCnt];
                iCnt += 2;
        }

        //unused at the moment
        m_iRelBoardTempSensor = (cMsg[iCnt + 1] << 8) | cMsg[iCnt];
        iCnt += 2;
        
        //Digital Inputs
        //unused at the moment
        m_iDigIn = (cMsg[iCnt + 1] << 8) | cMsg[iCnt];
        iCnt += 2;

        //Throw away rest of the message, it was used for earlier purposes

        m_Mutex.unlock();
        return true;
}