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#include "SLP.h"
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void SLPSendPacket(char * buf, uchar len1);
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uchar bSLPMaster;
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uchar nStation;
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uchar SLPinputB;
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uchar SLPoutputB;
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uchar nCurStation;
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uchar inputBuf[5];
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uchar outputBuf[5];
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uchar SendBuf[8];
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uchar SLPMasterRecved; //Ö÷»úÊÕµ½×Ó»ú»Ø¸´
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unsigned int SLPSlaveCountOut;
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unsigned int SLPLostPkt=0; // ¶ª°üÊýÁ¿
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uchar SLPOKSign;
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uchar SLPErrSign;
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uchar SLPBCC(char * pBuf, uchar len1)
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{
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uchar i;
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uchar BCC=0;
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for (i=0;i<len1;i++)
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{
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BCC += pBuf[i];
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}
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return BCC;
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}
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void SLPparsePacket(char * pRecvBuf, uchar len1)
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{
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stSLPPacket * pPacket = (stSLPPacket *)pRecvBuf;
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if (len1 != sizeof(stSLPPacket)) return;
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// if (pPacket->ED != EDsign) return;
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if (pPacket->BCC != SLPBCC(pRecvBuf,len1-1)) return;
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if (bSLPMaster) //master
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{
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if (pPacket->ST ==ST_S)
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{
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//check
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if (pPacket->Dst == nCurStation) {
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SLPMasterRecved=1;
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SLPLostPkt=0;
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inputBuf[nCurStation] = pPacket->Data;
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}
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}
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// SLPoutputB = (inputBuf[1] &0x0f) | ((inputBuf[2] &0x0f) << 4);
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SLPoutputB = inputBuf[1];
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}else
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{ //slave
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if (pPacket->ST==ST_M)
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{
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//check
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stSLPPacket * pRplyPkt = (stSLPPacket *)SendBuf;
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if (pPacket->Dst == nStation) {
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SLPoutputB = pPacket->Data;
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SLPSlaveCountOut=0;
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pRplyPkt->ST = ST_S;
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pRplyPkt->Dst = nStation;
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pRplyPkt->Data = SLPinputB;
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pRplyPkt->BCC = SLPBCC(SendBuf, sizeof(stSLPPacket)-1);
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// pRplyPkt->ED = EDsign;
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SLPSendPacket(SendBuf,sizeof(stSLPPacket));
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}
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}
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}
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}
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void SLPMasterSendPacket(void)
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{
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stSLPPacket * pReqPkt = (stSLPPacket *)SendBuf;
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outputBuf[1]=SLPinputB ;//&0xf;
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// outputBuf[2] = (SLPinputB & 0xf0) >> 4;
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pReqPkt->ST = ST_M;
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pReqPkt->Dst = nCurStation;
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pReqPkt->Data = outputBuf[nCurStation]; ;
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pReqPkt->BCC = SLPBCC(SendBuf, sizeof(stSLPPacket)-1);
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// pReqPkt->ED = EDsign;
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SLPSendPacket(SendBuf,sizeof(stSLPPacket));
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}
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void SLPProcess(void)
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{
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static int nCount =0;
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if (bSLPMaster) //master
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{
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if ( (nCount & 0x3f) == 0 )
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{ //time up
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if (SLPMasterRecved) {
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// SLPMasterRecved=0;
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SLPOKSign = 1;
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if (SLPErrSign) SLPErrSign--;
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}else {
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SLPLostPkt++;
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if (SLPLostPkt > 10) {
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SLPErrSign=20;
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SLPOKSign = 0;
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}
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}
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if (nStation >0) {
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nCurStation++;
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if (nCurStation > nStation) {
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nCurStation =1;
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}
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SLPMasterRecved=0;
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SLPMasterSendPacket();
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}
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}
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}else
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{
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SLPSlaveCountOut ++;
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if (SLPSlaveCountOut >200) // 20mS
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{
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SLPErrSign=100;
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}else {
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if (SLPErrSign) SLPErrSign--;
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}
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}
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nCount++;
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}
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