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