/[PAMELA software]/yoda/techmodel/physics/S4Reader.cpp
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revision 2.2 by kusanagi, Thu Dec 9 08:48:54 2004 UTC revision 2.4.2.1 by kusanagi, Sat Mar 5 16:09:15 2005 UTC
# Line 1  Line 1 
1  /** @file  /** @file
2   * $Source: /home/cvsmanager/yoda/techmodel/physics/S4Reader.cpp,v $   * $Source: /home/cvsmanager/yoda/techmodel/physics/S4Reader.cpp,v $
3   * $Id: S4Reader.cpp,v 2.1 2004/10/17 12:28:46 kusanagi Exp $   * $Id: S4Reader.cpp,v 2.4 2005/01/13 14:50:01 kusanagi Exp $
4   * $Author: kusanagi $   * $Author: kusanagi $
5   *   *
6   * Implementation of the S4Reader class.   * Implementation of the S4Reader class.
# Line 29  S4Reader::S4Reader(void): Line 29  S4Reader::S4Reader(void):
29   */   */
30  std::string S4Reader::GetVersionInfo(void) const {  std::string S4Reader::GetVersionInfo(void) const {
31    return    return
32      "$Header: /home/cvsmanager/yoda/techmodel/physics/S4Reader.cpp,v 2.1 2004/10/17 12:28:46 kusanagi Exp $";      "$Header: /home/cvsmanager/yoda/techmodel/physics/S4Reader.cpp,v 2.4 2005/01/13 14:50:01 kusanagi Exp $";
33  }  }
34    
35  /**  /**
# Line 55  void S4Reader::RunEvent(int EventNumber) Line 55  void S4Reader::RunEvent(int EventNumber)
55   * consequently supposing the Neutron data (12 Bytes) always present S4 start 18 Bytes before the end of the packet   * consequently supposing the Neutron data (12 Bytes) always present S4 start 18 Bytes before the end of the packet
56   */   */
57  void S4Reader::RunEvent(int EventNumber, const char subData[], long int length) {  void S4Reader::RunEvent(int EventNumber, const char subData[], long int length) {
58     //char *data = new char[lenght];     const int lenS4Data = 6;
59     //memcpy(data, subData, lenght);     char *data = new char[length];
60     int offset = length - 18;     int offset;
61     s4->S4_REG_STATUS        = (((UINT8)subData[offset])&0xF0);     int index = haveData(data, length);
62     s4->S4_DATA              = ((((UINT16)subData[offset]<<8)&0x0FFF) + (((UINT16)subData[offset+1])&0x00FF));    
63     s4->S4_CMD_NUM           = (((UINT8)subData[offset+2])&0xFF);;     if (index > -1){
64     s4->S4_RESP_LENGHT       = ((((UINT16)subData[offset+3]<<8)&0xFF00) + (((UINT16)subData[offset+4])&0x00FF));;          int offset = length - index;
65     s4->S4_OVERALL_CHKCODE   = (((UINT8)subData[offset+5])&0xFF);;          s4->S4_REG_STATUS        = (((UINT8)subData[offset])&0xF0);
66            s4->S4_DATA              = ((((UINT16)subData[offset]<<8)&0x0FFF) + (((UINT16)subData[offset+1])&0x00FF));
67            s4->S4_CMD_NUM           = (((UINT8)subData[offset+2])&0xFF);
68            s4->S4_RESP_LENGHT       = ((((UINT16)subData[offset+3]<<8)&0xFF00) + (((UINT16)subData[offset+4])&0x00FF));
69            s4->S4_OVERALL_CHKCODE   = (((UINT8)subData[offset+5])&0xFF);
70            s4->unpackError          = 0;
71        } else {
72            s4->unpackError = 1;
73        }
74        delete[] data;
75  }  }
76    
77    /*
78     *
79     * @return int
80     * It return the index, starting from the end of data[] parameter, which
81     * is the starting byte of the S4 data.
82     *
83    */
84    /**
85     * Check if S4Data are present.
86     * @param const char data[] - Physics data
87     * @param long int lenght - Lenght of data[]
88     * @return int - -1 if S4 has not been found, otherwise it represent the
89     *               index from the end of data[] from which S4 data starts
90     */
91    int S4Reader::haveData(const char data[], long int length){
92        int ret = -1;
93        /* I start 20 bytes from the end because we have three cases:
94         *
95         * 1) S4 (4bytes) + NeutronDetector (12bytes) //END PACKET
96         * 2) S4 (4bytes) //END PACKET
97         * 3) //END PACKET
98         *
99         * so in anycase I expect to find the data into the last 20 bytes
100         * Anyway, it will be a MUST to implements also the check of the CRC
101         * on the S4 data to have a better confidence on the data; the crc algorithm
102         * sholud be the same of the Tracker
103         *
104         */
105        int  index = 0;
106        char dataByte;
107        int subIndex = 0;
108        const int subDataDepth = 20;
109        int offset = length - subDataDepth;
110        const int subSignDim = 3;
111        const unsigned char subSign[subSignDim]={0xD8, 0x00, 0x03};
112        while (index < subDataDepth){
113            dataByte = data[offset + index++];
114            if (dataByte == (char)(*(subSign+subIndex))){
115                if (subIndex++ == (subSignDim-1)) {
116                    //If here i catch it!!!
117                    return subDataDepth - index + subSignDim + 2;
118                }
119            } else {
120                index = index - (subIndex);
121                subIndex = 0;
122            }
123        }
124        return ret;
125    }
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