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#include "rmapoperations.h"
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RMAP::RMAP(RMAP_command_codes commandCode, unsigned char targetLogicalAddress, unsigned char initiatorLogicalAddress,
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int startAddress, int nbBytes, char* data)
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{
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char packetType; // 2 most Significant Bits
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char command; // 4 bits
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char replyAddressLength; // 2 Least Significant Bits
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int SPWPacketSize;
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// GRESB HEADER
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if (data == NULL){
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SPWPacketSize = sizeof(RMAPHeader) ;
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dataCRC = 0x00;
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}
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else{
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SPWPacketSize = sizeof(RMAPHeader) + nbBytes + 1 ; // SPW Packet = Header + Data + dataCRC
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dataCRC = RMAPCalculateDataCRC(data, nbBytes);
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}
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GRESBHeader.GRESBProtocoleID = 0x00; // packets with protocole ID 0 have a SpaceWire packet as payload
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GRESBHeader.SPWPacketSize2 = (SPWPacketSize>>16);
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GRESBHeader.SPWPacketSize1 = (SPWPacketSize>>8);
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GRESBHeader.SPWPacketSize0 = (SPWPacketSize);
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// SPACEWIRE HEADER
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packetType = (char) 0b01; // 0b01 for a command, 0b00 for a reply
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command = (char) commandCode;
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replyAddressLength = (char) 0b00; // RMAP command: number of bytes in the reply address field
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// RMAP reply: copy of the reply address field of the command
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switch (commandCode){
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case writeSingle_noVer_noRep:
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case writeSingle_noVer_Rep:
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case writeSingle_ver_noRep:
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case writeSingle_ver_rep:
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if (nbBytes > 4) command = command + 1; // switch between Single and Incremental Read/Write operations
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break;
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default:
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break;
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}
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RMAPHeader.targetLogicalAddress = targetLogicalAddress;
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RMAPHeader.protocolIdentifier = 0x01; // 0x01 is the protocole identifier for RMAP
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RMAPHeader.instruction = (packetType<<6) + (command<<2) + (replyAddressLength);
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RMAPHeader.key = DEFAULT_DESTINATION_KEY; // used for command authorization
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RMAPHeader.initiatorLogicalAddress = initiatorLogicalAddress; // 0 is the default address for the GRESB module
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RMAPHeader.transactionIdentifier1 = 0x00;
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RMAPHeader.transactionIdentifier0 = 0x01;
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RMAPHeader.extendedAddress = 0x00;
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RMAPHeader.address3 = (char) (startAddress>>24);
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RMAPHeader.address2 = (char) (startAddress>>16);
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RMAPHeader.address1 = (char) (startAddress>>8);
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RMAPHeader.address0 = (char) (startAddress);
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RMAPHeader.dataLength2 = (char) (nbBytes>>16);
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RMAPHeader.dataLength1 = (char) (nbBytes>>8);
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RMAPHeader.dataLength0 = (char) (nbBytes);
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RMAPHeader.headerCRC = RMAPCalculateHeaderCRC();
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}
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unsigned char RMAP::RMAPCalculateCRC(unsigned char INCR, unsigned char INBYTE)
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{
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return RMAP_CRCTable[INCR ^ INBYTE];
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}
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unsigned char RMAP::RMAPCalculateHeaderCRC()
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{
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unsigned char INCR = 0;
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INCR = RMAPCalculateCRC(INCR, RMAPHeader.targetLogicalAddress);
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INCR = RMAPCalculateCRC(INCR, RMAPHeader.protocolIdentifier);
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INCR = RMAPCalculateCRC(INCR, RMAPHeader.instruction);
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INCR = RMAPCalculateCRC(INCR, RMAPHeader.key);
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INCR = RMAPCalculateCRC(INCR, RMAPHeader.initiatorLogicalAddress);
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INCR = RMAPCalculateCRC(INCR, RMAPHeader.transactionIdentifier1);
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INCR = RMAPCalculateCRC(INCR, RMAPHeader.transactionIdentifier0);
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INCR = RMAPCalculateCRC(INCR, RMAPHeader.extendedAddress);
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INCR = RMAPCalculateCRC(INCR, RMAPHeader.address3);
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INCR = RMAPCalculateCRC(INCR, RMAPHeader.address2);
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INCR = RMAPCalculateCRC(INCR, RMAPHeader.address1);
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INCR = RMAPCalculateCRC(INCR, RMAPHeader.address0);
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INCR = RMAPCalculateCRC(INCR, RMAPHeader.dataLength2);
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INCR = RMAPCalculateCRC(INCR, RMAPHeader.dataLength1);
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INCR = RMAPCalculateCRC(INCR, RMAPHeader.dataLength0);
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return(INCR);
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}
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unsigned char RMAP::RMAPCalculateDataCRC(char *data, int nbBytes)
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{
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unsigned char INCR = 0;
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for (int k=0; k<nbBytes; k++)
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{
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INCR = RMAPCalculateCRC(INCR, data[k]);
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}
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return(INCR);
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}
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