413 lines
12 KiB
C
413 lines
12 KiB
C
/*
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* FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
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* Copyright (c) 2006 Christian Walter <wolti@sil.at>
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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: mb.c,v 1.27 2007/02/18 23:45:41 wolti Exp $
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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 "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_SLAVE_RTU_ENABLED == 1
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#include "mbrtu.h"
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#endif
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#if MB_SLAVE_ASCII_ENABLED == 1
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#include "mbascii.h"
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#endif
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#if MB_SLAVE_TCP_ENABLED == 1
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#include "mbtcp.h"
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#endif
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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 ucMBAddress;
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static eMBMode eMBCurrentMode;
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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 Slave
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*/
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static peMBFrameSend peMBFrameSendCur;
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static pvMBFrameStart pvMBFrameStartCur;
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static pvMBFrameStop pvMBFrameStopCur;
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static peMBFrameReceive peMBFrameReceiveCur;
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static pvMBFrameClose pvMBFrameCloseCur;
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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 Slave
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*/
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BOOL( *pxMBFrameCBByteReceived ) ( void );
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BOOL( *pxMBFrameCBTransmitterEmpty ) ( void );
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BOOL( *pxMBPortCBTimerExpired ) ( void );
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BOOL( *pxMBFrameCBReceiveFSMCur ) ( void );
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BOOL( *pxMBFrameCBTransmitFSMCur ) ( 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 xFuncHandlers[MB_FUNC_HANDLERS_MAX] = {
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#if MB_FUNC_OTHER_REP_SLAVEID_ENABLED > 0
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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, eMBFuncReadInputRegister},
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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, eMBFuncReadHoldingRegister},
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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, eMBFuncWriteMultipleHoldingRegister},
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#endif
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#if MB_FUNC_WRITE_HOLDING_ENABLED > 0
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{MB_FUNC_WRITE_REGISTER, eMBFuncWriteHoldingRegister},
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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, eMBFuncReadWriteMultipleHoldingRegister},
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#endif
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#if MB_FUNC_READ_COILS_ENABLED > 0
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{MB_FUNC_READ_COILS, eMBFuncReadCoils},
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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, eMBFuncWriteCoil},
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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, eMBFuncWriteMultipleCoils},
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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, eMBFuncReadDiscreteInputs},
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#endif
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};
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/* ----------------------- Start implementation -----------------------------*/
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eMBErrorCode
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eMBInit( eMBMode eMode, UCHAR ucSlaveAddress, UCHAR ucPort, ULONG ulBaudRate, eMBParity eParity )
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{
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eMBErrorCode eStatus = MB_ENOERR;
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/* check preconditions */
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if( ( ucSlaveAddress == MB_ADDRESS_BROADCAST ) ||
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( ucSlaveAddress < MB_ADDRESS_MIN ) || ( ucSlaveAddress > MB_ADDRESS_MAX ) )
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{
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eStatus = MB_EINVAL;
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}
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else
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{
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ucMBAddress = ucSlaveAddress;
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switch ( eMode )
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{
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#if MB_SLAVE_RTU_ENABLED > 0
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case MB_RTU:
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pvMBFrameStartCur = eMBRTUStart;
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pvMBFrameStopCur = eMBRTUStop;
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peMBFrameSendCur = eMBRTUSend;
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peMBFrameReceiveCur = eMBRTUReceive;
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pvMBFrameCloseCur = MB_PORT_HAS_CLOSE ? vMBPortClose : NULL;
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pxMBFrameCBByteReceived = xMBRTUReceiveFSM;
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pxMBFrameCBTransmitterEmpty = xMBRTUTransmitFSM;
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pxMBPortCBTimerExpired = xMBRTUTimerT35Expired;
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eStatus = eMBRTUInit( ucMBAddress, ucPort, ulBaudRate, eParity );
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break;
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#endif
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#if MB_SLAVE_ASCII_ENABLED > 0
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case MB_ASCII:
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pvMBFrameStartCur = eMBASCIIStart;
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pvMBFrameStopCur = eMBASCIIStop;
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peMBFrameSendCur = eMBASCIISend;
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peMBFrameReceiveCur = eMBASCIIReceive;
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pvMBFrameCloseCur = MB_PORT_HAS_CLOSE ? vMBPortClose : NULL;
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pxMBFrameCBByteReceived = xMBASCIIReceiveFSM;
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pxMBFrameCBTransmitterEmpty = xMBASCIITransmitFSM;
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pxMBPortCBTimerExpired = xMBASCIITimerT1SExpired;
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eStatus = eMBASCIIInit( ucMBAddress, 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( !xMBPortEventInit( ) )
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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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eMBCurrentMode = eMode;
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eMBState = STATE_DISABLED;
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}
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}
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}
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return eStatus;
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}
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#if MB_SLAVE_TCP_ENABLED > 0
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eMBErrorCode
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eMBTCPInit( USHORT ucTCPPort )
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{
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eMBErrorCode eStatus = MB_ENOERR;
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if( ( eStatus = eMBTCPDoInit( ucTCPPort ) ) != MB_ENOERR )
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{
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eMBState = STATE_DISABLED;
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}
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else if( !xMBPortEventInit( ) )
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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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pvMBFrameStartCur = eMBTCPStart;
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pvMBFrameStopCur = eMBTCPStop;
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peMBFrameReceiveCur = eMBTCPReceive;
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peMBFrameSendCur = eMBTCPSend;
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pvMBFrameCloseCur = MB_PORT_HAS_CLOSE ? vMBTCPPortClose : NULL;
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ucMBAddress = MB_TCP_PSEUDO_ADDRESS;
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eMBCurrentMode = MB_TCP;
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eMBState = STATE_DISABLED;
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}
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return eStatus;
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}
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#endif
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eMBErrorCode
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eMBRegisterCB( UCHAR ucFunctionCode, pxMBFunctionHandler pxHandler )
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{
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int i;
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eMBErrorCode eStatus;
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if( ( 0 < ucFunctionCode ) && ( ucFunctionCode <= 127 ) )
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{
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ENTER_CRITICAL_SECTION( );
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if( pxHandler != NULL )
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{
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for( i = 0; i < MB_FUNC_HANDLERS_MAX; i++ )
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{
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if( ( xFuncHandlers[i].pxHandler == NULL ) ||
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( xFuncHandlers[i].pxHandler == pxHandler ) )
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{
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xFuncHandlers[i].ucFunctionCode = ucFunctionCode;
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xFuncHandlers[i].pxHandler = pxHandler;
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break;
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}
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}
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eStatus = ( i != MB_FUNC_HANDLERS_MAX ) ? MB_ENOERR : MB_ENORES;
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}
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else
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{
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for( i = 0; i < MB_FUNC_HANDLERS_MAX; i++ )
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{
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if( xFuncHandlers[i].ucFunctionCode == ucFunctionCode )
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{
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xFuncHandlers[i].ucFunctionCode = 0;
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xFuncHandlers[i].pxHandler = NULL;
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break;
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}
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}
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/* Remove can't fail. */
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eStatus = MB_ENOERR;
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}
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EXIT_CRITICAL_SECTION( );
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}
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else
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{
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eStatus = MB_EINVAL;
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}
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return eStatus;
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}
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eMBErrorCode
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eMBClose( 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( pvMBFrameCloseCur != NULL )
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{
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pvMBFrameCloseCur( );
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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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eMBEnable( 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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pvMBFrameStartCur( );
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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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eMBDisable( 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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pvMBFrameStopCur( );
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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 eMBPoll( 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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eMBEventType 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( xMBPortEventGet( &eEvent ) == TRUE )
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{
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switch ( eEvent )
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{
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case EV_READY:
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break;
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case EV_FRAME_RECEIVED:
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eStatus = peMBFrameReceiveCur( &ucRcvAddress, &ucMBFrame, &usLength );
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if( eStatus == MB_ENOERR )
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{
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/* Check if the frame is for us. If not ignore the frame. */
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if( ( ucRcvAddress == ucMBAddress ) || ( ucRcvAddress == MB_ADDRESS_BROADCAST ) )
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{
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( void )xMBPortEventPost( EV_EXECUTE );
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}
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}
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break;
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case EV_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( xFuncHandlers[i].ucFunctionCode == 0 )
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{
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break;
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}
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else if( xFuncHandlers[i].ucFunctionCode == ucFunctionCode )
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{
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eException = xFuncHandlers[i].pxHandler( ucMBFrame, &usLength );
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break;
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}
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}
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/* If the request was not sent to the broadcast address we
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* return a reply. */
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if( ucRcvAddress != MB_ADDRESS_BROADCAST )
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{
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if( eException != MB_EX_NONE )
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{
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/* An exception occured. Build an error frame. */
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usLength = 0;
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ucMBFrame[usLength++] = ( UCHAR )( ucFunctionCode | MB_FUNC_ERROR );
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ucMBFrame[usLength++] = eException;
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}
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eStatus = peMBFrameSendCur( ucMBAddress, ucMBFrame, usLength );
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}
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break;
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case EV_FRAME_SENT:
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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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