/* * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU. * Copyright (C) 2013 Armink * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * File: $Id: mbrtu_m.c,v 1.60 2013/08/20 11:18:10 Armink Add Master Functions $ */ /* ----------------------- System includes ----------------------------------*/ #include "stdlib.h" #include "string.h" /* ----------------------- Platform includes --------------------------------*/ #include "port.h" /* ----------------------- Modbus includes ----------------------------------*/ #include "mb.h" #include "mb_m.h" #include "mbconfig.h" #include "mbframe.h" #include "mbproto.h" #include "mbfunc.h" #include "mbport.h" #if MB_MASTER_RTU_ENABLED == 1 #include "mbrtu.h" #endif #if MB_MASTER_ASCII_ENABLED == 1 #include "mbascii.h" #endif #if MB_MASTER_TCP_ENABLED == 1 #include "mbtcp.h" #endif #if MB_MASTER_RTU_ENABLED > 0 || MB_MASTER_ASCII_ENABLED > 0 #ifndef MB_PORT_HAS_CLOSE #define MB_PORT_HAS_CLOSE 0 #endif /* ----------------------- Static variables ---------------------------------*/ static UCHAR ucMBMasterDestAddress; static BOOL xMBRunInMasterMode = FALSE; static BOOL xMasterIsBusy = FALSE; static enum { STATE_ENABLED, STATE_DISABLED, STATE_NOT_INITIALIZED } eMBState = STATE_NOT_INITIALIZED; /* Functions pointer which are initialized in eMBInit( ). Depending on the * mode (RTU or ASCII) the are set to the correct implementations. * Using for Modbus Master,Add by Armink 20130813 */ static peMBFrameSend peMBMasterFrameSendCur; static pvMBFrameStart pvMBMasterFrameStartCur; static pvMBFrameStop pvMBMasterFrameStopCur; static peMBFrameReceive peMBMasterFrameReceiveCur; static pvMBFrameClose pvMBMasterFrameCloseCur; /* Callback functions required by the porting layer. They are called when * an external event has happend which includes a timeout or the reception * or transmission of a character. * Using for Modbus Master,Add by Armink 20130813 */ BOOL( *pxMBMasterFrameCBByteReceived ) ( void ); BOOL( *pxMBMasterFrameCBTransmitterEmpty ) ( void ); BOOL( *pxMBMasterPortCBTimerExpired ) ( void ); BOOL( *pxMBMasterFrameCBReceiveFSMCur ) ( void ); BOOL( *pxMBMasterFrameCBTransmitFSMCur ) ( void ); /* An array of Modbus functions handlers which associates Modbus function * codes with implementing functions. */ static xMBFunctionHandler xMasterFuncHandlers[MB_FUNC_HANDLERS_MAX] = { #if MB_FUNC_OTHER_REP_SLAVEID_ENABLED > 0 //TODO Add Master function define {MB_FUNC_OTHER_REPORT_SLAVEID, eMBFuncReportSlaveID}, #endif #if MB_FUNC_READ_INPUT_ENABLED > 0 {MB_FUNC_READ_INPUT_REGISTER, eMBMasterFuncReadInputRegister}, #endif #if MB_FUNC_READ_HOLDING_ENABLED > 0 {MB_FUNC_READ_HOLDING_REGISTER, eMBMasterFuncReadHoldingRegister}, #endif #if MB_FUNC_WRITE_MULTIPLE_HOLDING_ENABLED > 0 {MB_FUNC_WRITE_MULTIPLE_REGISTERS, eMBMasterFuncWriteMultipleHoldingRegister}, #endif #if MB_FUNC_WRITE_HOLDING_ENABLED > 0 {MB_FUNC_WRITE_REGISTER, eMBMasterFuncWriteHoldingRegister}, #endif #if MB_FUNC_READWRITE_HOLDING_ENABLED > 0 {MB_FUNC_READWRITE_MULTIPLE_REGISTERS, eMBMasterFuncReadWriteMultipleHoldingRegister}, #endif #if MB_FUNC_READ_COILS_ENABLED > 0 {MB_FUNC_READ_COILS, eMBMasterFuncReadCoils}, #endif #if MB_FUNC_WRITE_COIL_ENABLED > 0 {MB_FUNC_WRITE_SINGLE_COIL, eMBMasterFuncWriteCoil}, #endif #if MB_FUNC_WRITE_MULTIPLE_COILS_ENABLED > 0 {MB_FUNC_WRITE_MULTIPLE_COILS, eMBMasterFuncWriteMultipleCoils}, #endif #if MB_FUNC_READ_DISCRETE_INPUTS_ENABLED > 0 {MB_FUNC_READ_DISCRETE_INPUTS, eMBMasterFuncReadDiscreteInputs}, #endif }; /* ----------------------- Start implementation -----------------------------*/ eMBErrorCode eMBMasterInit( eMBMode eMode, UCHAR ucPort, ULONG ulBaudRate, eMBParity eParity ) { eMBErrorCode eStatus = MB_ENOERR; switch (eMode) { #if MB_MASTER_RTU_ENABLED > 0 case MB_RTU: pvMBMasterFrameStartCur = eMBMasterRTUStart; pvMBMasterFrameStopCur = eMBMasterRTUStop; peMBMasterFrameSendCur = eMBMasterRTUSend; peMBMasterFrameReceiveCur = eMBMasterRTUReceive; pvMBMasterFrameCloseCur = MB_PORT_HAS_CLOSE ? vMBMasterPortClose : NULL; pxMBMasterFrameCBByteReceived = xMBMasterRTUReceiveFSM; pxMBMasterFrameCBTransmitterEmpty = xMBMasterRTUTransmitFSM; pxMBMasterPortCBTimerExpired = xMBMasterRTUTimerExpired; eStatus = eMBMasterRTUInit(ucPort, ulBaudRate, eParity); break; #endif #if MB_MASTER_ASCII_ENABLED > 0 case MB_ASCII: pvMBMasterFrameStartCur = eMBMasterASCIIStart; pvMBMasterFrameStopCur = eMBMasterASCIIStop; peMBMasterFrameSendCur = eMBMasterASCIISend; peMBMasterFrameReceiveCur = eMBMasterASCIIReceive; pvMBMasterFrameCloseCur = MB_PORT_HAS_CLOSE ? vMBMasterPortClose : NULL; pxMBMasterFrameCBByteReceived = xMBMasterASCIIReceiveFSM; pxMBMasterFrameCBTransmitterEmpty = xMBMasterASCIITransmitFSM; pxMBMasterPortCBTimerExpired = xMBMasterASCIITimerT1SExpired; eStatus = eMBMasterASCIIInit(ucPort, ulBaudRate, eParity ); break; #endif default: eStatus = MB_EINVAL; break; } if (eStatus == MB_ENOERR) { if (!xMBMasterPortEventInit()) { /* port dependent event module initalization failed. */ eStatus = MB_EPORTERR; } else { eMBState = STATE_DISABLED; } } return eStatus; } eMBErrorCode eMBMasterClose( void ) { eMBErrorCode eStatus = MB_ENOERR; if( eMBState == STATE_DISABLED ) { if( pvMBMasterFrameCloseCur != NULL ) { pvMBMasterFrameCloseCur( ); } } else { eStatus = MB_EILLSTATE; } return eStatus; } eMBErrorCode eMBMasterEnable( void ) { eMBErrorCode eStatus = MB_ENOERR; if( eMBState == STATE_DISABLED ) { /* Activate the protocol stack. */ pvMBMasterFrameStartCur( ); eMBState = STATE_ENABLED; } else { eStatus = MB_EILLSTATE; } return eStatus; } eMBErrorCode eMBMasterDisable( void ) { eMBErrorCode eStatus; if( eMBState == STATE_ENABLED ) { pvMBMasterFrameStopCur( ); eMBState = STATE_DISABLED; eStatus = MB_ENOERR; } else if( eMBState == STATE_DISABLED ) { eStatus = MB_ENOERR; } else { eStatus = MB_EILLSTATE; } return eStatus; } eMBErrorCode eMBMasterPoll( void ) { static UCHAR *ucMBFrame; static UCHAR ucRcvAddress; static UCHAR ucFunctionCode; static USHORT usLength; static eMBException eException; int i; eMBErrorCode eStatus = MB_ENOERR; eMBMasterEventType eEvent; /* Check if the protocol stack is ready. */ if( eMBState != STATE_ENABLED ) { return MB_EILLSTATE; } /* Check if there is a event available. If not return control to caller. * Otherwise we will handle the event. */ if( xMBMasterPortEventGet( &eEvent ) == TRUE ) { switch ( eEvent ) { case EV_MASTER_READY: break; case EV_MASTER_FRAME_RECEIVED: eStatus = peMBMasterFrameReceiveCur( &ucRcvAddress, &ucMBFrame, &usLength ); /* Check if the frame is for us. If not ,send an error process event. */ if ( ( eStatus == MB_ENOERR ) && ( ucRcvAddress == ucMBMasterGetDestAddress() ) ) { ( void ) xMBMasterPortEventPost( EV_MASTER_EXECUTE ); } else { ( void ) xMBMasterPortEventPost( EV_MASTER_ERROR_PROCESS ); } break; case EV_MASTER_EXECUTE: ucFunctionCode = ucMBFrame[MB_PDU_FUNC_OFF]; eException = MB_EX_ILLEGAL_FUNCTION; for( i = 0; i < MB_FUNC_HANDLERS_MAX; i++ ) { /* No more function handlers registered. Abort. */ if( xMasterFuncHandlers[i].ucFunctionCode == 0 ) { break; } else if( xMasterFuncHandlers[i].ucFunctionCode == ucFunctionCode ) { vMBMasterSetCBRunInMasterMode(TRUE); eException = xMasterFuncHandlers[i].pxHandler( ucMBFrame, &usLength ); vMBMasterSetCBRunInMasterMode(FALSE); break; } } /* If receive frame has exception .The receive function code highest bit is 1.*/ if(ucFunctionCode >> 7) eException = (eMBException)ucMBFrame[MB_PDU_DATA_OFF]; /* If master has exception ,Master will send error process.Otherwise the Master is idle.*/ if (eException != MB_EX_NONE) ( void ) xMBMasterPortEventPost( EV_MASTER_ERROR_PROCESS ); else vMBMasterSetIsBusy( FALSE ); break; case EV_MASTER_FRAME_SENT: /* Master is busy now. */ vMBMasterSetIsBusy( TRUE ); vMBMasterGetPDUSndBuf( &ucMBFrame ); eStatus = peMBMasterFrameSendCur( ucMBMasterGetDestAddress(), ucMBFrame, ucMBMasterGetPDUSndLength() ); break; case EV_MASTER_ERROR_PROCESS: vMBMasterSetIsBusy( FALSE ); break; } } return MB_ENOERR; } /* Get whether the Modbus Master is busy.*/ BOOL xMBMasterGetIsBusy( void ) { return xMasterIsBusy; } /* Set whether the Modbus Master is busy.*/ void vMBMasterSetIsBusy( BOOL IsBusy ) { xMasterIsBusy = IsBusy; } /* Get whether the Modbus Master is run in master mode.*/ BOOL xMBMasterGetCBRunInMasterMode( void ) { return xMBRunInMasterMode; } /* Set whether the Modbus Master is run in master mode.*/ void vMBMasterSetCBRunInMasterMode( BOOL IsMasterMode ) { xMBRunInMasterMode = IsMasterMode; } /* Get Modbus Master send destination address*/ UCHAR ucMBMasterGetDestAddress( void ) { return ucMBMasterDestAddress; } /* Set Modbus Master send destination address*/ void vMBMasterSetDestAddress( UCHAR Address ) { ucMBMasterDestAddress = Address; } #endif