413 lines
12 KiB
C
413 lines
12 KiB
C
|
/*
|
||
|
|
* FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
|
||
|
|
* Copyright (c) 2006 Christian Walter <wolti@sil.at>
|
||
|
|
* 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: mb.c,v 1.28 2010/06/06 13:54:40 wolti Exp $
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* ----------------------- System includes ----------------------------------*/
|
||
|
|
#include "stdlib.h"
|
||
|
|
#include "string.h"
|
||
|
|
|
||
|
|
/* ----------------------- Platform includes --------------------------------*/
|
||
|
|
#include "port.h"
|
||
|
|
|
||
|
|
/* ----------------------- Modbus includes ----------------------------------*/
|
||
|
|
#include "mb.h"
|
||
|
|
#include "mbconfig.h"
|
||
|
|
#include "mbframe.h"
|
||
|
|
#include "mbproto.h"
|
||
|
|
#include "mbfunc.h"
|
||
|
|
|
||
|
|
#include "mbport.h"
|
||
|
|
#if MB_RTU_ENABLED == 1
|
||
|
|
#include "mbrtu.h"
|
||
|
|
#endif
|
||
|
|
#if MB_ASCII_ENABLED == 1
|
||
|
|
#include "mbascii.h"
|
||
|
|
#endif
|
||
|
|
#if MB_TCP_ENABLED == 1
|
||
|
|
#include "mbtcp.h"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef MB_PORT_HAS_CLOSE
|
||
|
|
#define MB_PORT_HAS_CLOSE 0
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* ----------------------- Static variables ---------------------------------*/
|
||
|
|
|
||
|
|
static UCHAR ucMBAddress;
|
||
|
|
static eMBMode eMBCurrentMode;
|
||
|
|
|
||
|
|
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.
|
||
|
|
*/
|
||
|
|
static peMBFrameSend peMBFrameSendCur;
|
||
|
|
static pvMBFrameStart pvMBFrameStartCur;
|
||
|
|
static pvMBFrameStop pvMBFrameStopCur;
|
||
|
|
static peMBFrameReceive peMBFrameReceiveCur;
|
||
|
|
static pvMBFrameClose pvMBFrameCloseCur;
|
||
|
|
|
||
|
|
/* 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.
|
||
|
|
*/
|
||
|
|
BOOL( *pxMBFrameCBByteReceived ) ( void );
|
||
|
|
BOOL( *pxMBFrameCBTransmitterEmpty ) ( void );
|
||
|
|
BOOL( *pxMBPortCBTimerExpired ) ( void );
|
||
|
|
|
||
|
|
BOOL( *pxMBFrameCBReceiveFSMCur ) ( void );
|
||
|
|
BOOL( *pxMBFrameCBTransmitFSMCur ) ( void );
|
||
|
|
|
||
|
|
/* An array of Modbus functions handlers which associates Modbus function
|
||
|
|
* codes with implementing functions.
|
||
|
|
*/
|
||
|
|
static xMBFunctionHandler xFuncHandlers[MB_FUNC_HANDLERS_MAX] = {
|
||
|
|
#if MB_FUNC_OTHER_REP_SLAVEID_ENABLED > 0
|
||
|
|
{MB_FUNC_OTHER_REPORT_SLAVEID, eMBFuncReportSlaveID},
|
||
|
|
#endif
|
||
|
|
#if MB_FUNC_READ_INPUT_ENABLED > 0
|
||
|
|
{MB_FUNC_READ_INPUT_REGISTER, eMBFuncReadInputRegister},
|
||
|
|
#endif
|
||
|
|
#if MB_FUNC_READ_HOLDING_ENABLED > 0
|
||
|
|
{MB_FUNC_READ_HOLDING_REGISTER, eMBFuncReadHoldingRegister},
|
||
|
|
#endif
|
||
|
|
#if MB_FUNC_WRITE_MULTIPLE_HOLDING_ENABLED > 0
|
||
|
|
{MB_FUNC_WRITE_MULTIPLE_REGISTERS, eMBFuncWriteMultipleHoldingRegister},
|
||
|
|
#endif
|
||
|
|
#if MB_FUNC_WRITE_HOLDING_ENABLED > 0
|
||
|
|
{MB_FUNC_WRITE_REGISTER, eMBFuncWriteHoldingRegister},
|
||
|
|
#endif
|
||
|
|
#if MB_FUNC_READWRITE_HOLDING_ENABLED > 0
|
||
|
|
{MB_FUNC_READWRITE_MULTIPLE_REGISTERS, eMBFuncReadWriteMultipleHoldingRegister},
|
||
|
|
#endif
|
||
|
|
#if MB_FUNC_READ_COILS_ENABLED > 0
|
||
|
|
{MB_FUNC_READ_COILS, eMBFuncReadCoils},
|
||
|
|
#endif
|
||
|
|
#if MB_FUNC_WRITE_COIL_ENABLED > 0
|
||
|
|
{MB_FUNC_WRITE_SINGLE_COIL, eMBFuncWriteCoil},
|
||
|
|
#endif
|
||
|
|
#if MB_FUNC_WRITE_MULTIPLE_COILS_ENABLED > 0
|
||
|
|
{MB_FUNC_WRITE_MULTIPLE_COILS, eMBFuncWriteMultipleCoils},
|
||
|
|
#endif
|
||
|
|
#if MB_FUNC_READ_DISCRETE_INPUTS_ENABLED > 0
|
||
|
|
{MB_FUNC_READ_DISCRETE_INPUTS, eMBFuncReadDiscreteInputs},
|
||
|
|
#endif
|
||
|
|
};
|
||
|
|
|
||
|
|
/* ----------------------- Start implementation -----------------------------*/
|
||
|
|
eMBErrorCode
|
||
|
|
eMBInit( eMBMode eMode, UCHAR ucSlaveAddress, UCHAR ucPort, ULONG ulBaudRate, eMBParity eParity )
|
||
|
|
{
|
||
|
|
eMBErrorCode eStatus = MB_ENOERR;
|
||
|
|
|
||
|
|
/* check preconditions */
|
||
|
|
if( ( ucSlaveAddress == MB_ADDRESS_BROADCAST ) ||
|
||
|
|
( ucSlaveAddress < MB_ADDRESS_MIN ) || ( ucSlaveAddress > MB_ADDRESS_MAX ) )
|
||
|
|
{
|
||
|
|
eStatus = MB_EINVAL;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
ucMBAddress = ucSlaveAddress;
|
||
|
|
|
||
|
|
switch ( eMode )
|
||
|
|
{
|
||
|
|
#if MB_RTU_ENABLED > 0
|
||
|
|
case MB_RTU:
|
||
|
|
pvMBFrameStartCur = eMBRTUStart;
|
||
|
|
pvMBFrameStopCur = eMBRTUStop;
|
||
|
|
peMBFrameSendCur = eMBRTUSend;
|
||
|
|
peMBFrameReceiveCur = eMBRTUReceive;
|
||
|
|
pvMBFrameCloseCur = MB_PORT_HAS_CLOSE ? vMBPortClose : NULL;
|
||
|
|
pxMBFrameCBByteReceived = xMBRTUReceiveFSM;
|
||
|
|
pxMBFrameCBTransmitterEmpty = xMBRTUTransmitFSM;
|
||
|
|
pxMBPortCBTimerExpired = xMBRTUTimerT35Expired;
|
||
|
|
|
||
|
|
eStatus = eMBRTUInit( ucMBAddress, ucPort, ulBaudRate, eParity );
|
||
|
|
break;
|
||
|
|
#endif
|
||
|
|
#if MB_ASCII_ENABLED > 0
|
||
|
|
case MB_ASCII:
|
||
|
|
pvMBFrameStartCur = eMBASCIIStart;
|
||
|
|
pvMBFrameStopCur = eMBASCIIStop;
|
||
|
|
peMBFrameSendCur = eMBASCIISend;
|
||
|
|
peMBFrameReceiveCur = eMBASCIIReceive;
|
||
|
|
pvMBFrameCloseCur = MB_PORT_HAS_CLOSE ? vMBPortClose : NULL;
|
||
|
|
pxMBFrameCBByteReceived = xMBASCIIReceiveFSM;
|
||
|
|
pxMBFrameCBTransmitterEmpty = xMBASCIITransmitFSM;
|
||
|
|
pxMBPortCBTimerExpired = xMBASCIITimerT1SExpired;
|
||
|
|
|
||
|
|
eStatus = eMBASCIIInit( ucMBAddress, ucPort, ulBaudRate, eParity );
|
||
|
|
break;
|
||
|
|
#endif
|
||
|
|
default:
|
||
|
|
eStatus = MB_EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
if( eStatus == MB_ENOERR )
|
||
|
|
{
|
||
|
|
if( !xMBPortEventInit( ) )
|
||
|
|
{
|
||
|
|
/* port dependent event module initalization failed. */
|
||
|
|
eStatus = MB_EPORTERR;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
eMBCurrentMode = eMode;
|
||
|
|
eMBState = STATE_DISABLED;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return eStatus;
|
||
|
|
}
|
||
|
|
|
||
|
|
#if MB_TCP_ENABLED > 0
|
||
|
|
eMBErrorCode
|
||
|
|
eMBTCPInit( USHORT ucTCPPort )
|
||
|
|
{
|
||
|
|
eMBErrorCode eStatus = MB_ENOERR;
|
||
|
|
|
||
|
|
if( ( eStatus = eMBTCPDoInit( ucTCPPort ) ) != MB_ENOERR )
|
||
|
|
{
|
||
|
|
eMBState = STATE_DISABLED;
|
||
|
|
}
|
||
|
|
else if( !xMBPortEventInit( ) )
|
||
|
|
{
|
||
|
|
/* Port dependent event module initalization failed. */
|
||
|
|
eStatus = MB_EPORTERR;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
pvMBFrameStartCur = eMBTCPStart;
|
||
|
|
pvMBFrameStopCur = eMBTCPStop;
|
||
|
|
peMBFrameReceiveCur = eMBTCPReceive;
|
||
|
|
peMBFrameSendCur = eMBTCPSend;
|
||
|
|
pvMBFrameCloseCur = MB_PORT_HAS_CLOSE ? vMBTCPPortClose : NULL;
|
||
|
|
ucMBAddress = MB_TCP_PSEUDO_ADDRESS;
|
||
|
|
eMBCurrentMode = MB_TCP;
|
||
|
|
eMBState = STATE_DISABLED;
|
||
|
|
}
|
||
|
|
return eStatus;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
eMBErrorCode
|
||
|
|
eMBRegisterCB( UCHAR ucFunctionCode, pxMBFunctionHandler pxHandler )
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
eMBErrorCode eStatus;
|
||
|
|
|
||
|
|
if( ( 0 < ucFunctionCode ) && ( ucFunctionCode <= 127 ) )
|
||
|
|
{
|
||
|
|
ENTER_CRITICAL_SECTION( );
|
||
|
|
if( pxHandler != NULL )
|
||
|
|
{
|
||
|
|
for( i = 0; i < MB_FUNC_HANDLERS_MAX; i++ )
|
||
|
|
{
|
||
|
|
if( ( xFuncHandlers[i].pxHandler == NULL ) ||
|
||
|
|
( xFuncHandlers[i].pxHandler == pxHandler ) )
|
||
|
|
{
|
||
|
|
xFuncHandlers[i].ucFunctionCode = ucFunctionCode;
|
||
|
|
xFuncHandlers[i].pxHandler = pxHandler;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
eStatus = ( i != MB_FUNC_HANDLERS_MAX ) ? MB_ENOERR : MB_ENORES;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
for( i = 0; i < MB_FUNC_HANDLERS_MAX; i++ )
|
||
|
|
{
|
||
|
|
if( xFuncHandlers[i].ucFunctionCode == ucFunctionCode )
|
||
|
|
{
|
||
|
|
xFuncHandlers[i].ucFunctionCode = 0;
|
||
|
|
xFuncHandlers[i].pxHandler = NULL;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/* Remove can't fail. */
|
||
|
|
eStatus = MB_ENOERR;
|
||
|
|
}
|
||
|
|
EXIT_CRITICAL_SECTION( );
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
eStatus = MB_EINVAL;
|
||
|
|
}
|
||
|
|
return eStatus;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
eMBErrorCode
|
||
|
|
eMBClose( void )
|
||
|
|
{
|
||
|
|
eMBErrorCode eStatus = MB_ENOERR;
|
||
|
|
|
||
|
|
if( eMBState == STATE_DISABLED )
|
||
|
|
{
|
||
|
|
if( pvMBFrameCloseCur != NULL )
|
||
|
|
{
|
||
|
|
pvMBFrameCloseCur( );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
eStatus = MB_EILLSTATE;
|
||
|
|
}
|
||
|
|
return eStatus;
|
||
|
|
}
|
||
|
|
|
||
|
|
eMBErrorCode
|
||
|
|
eMBEnable( void )
|
||
|
|
{
|
||
|
|
eMBErrorCode eStatus = MB_ENOERR;
|
||
|
|
|
||
|
|
if( eMBState == STATE_DISABLED )
|
||
|
|
{
|
||
|
|
/* Activate the protocol stack. */
|
||
|
|
pvMBFrameStartCur( );
|
||
|
|
eMBState = STATE_ENABLED;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
eStatus = MB_EILLSTATE;
|
||
|
|
}
|
||
|
|
return eStatus;
|
||
|
|
}
|
||
|
|
|
||
|
|
eMBErrorCode
|
||
|
|
eMBDisable( void )
|
||
|
|
{
|
||
|
|
eMBErrorCode eStatus;
|
||
|
|
|
||
|
|
if( eMBState == STATE_ENABLED )
|
||
|
|
{
|
||
|
|
pvMBFrameStopCur( );
|
||
|
|
eMBState = STATE_DISABLED;
|
||
|
|
eStatus = MB_ENOERR;
|
||
|
|
}
|
||
|
|
else if( eMBState == STATE_DISABLED )
|
||
|
|
{
|
||
|
|
eStatus = MB_ENOERR;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
eStatus = MB_EILLSTATE;
|
||
|
|
}
|
||
|
|
return eStatus;
|
||
|
|
}
|
||
|
|
|
||
|
|
eMBErrorCode
|
||
|
|
eMBPoll( void )
|
||
|
|
{
|
||
|
|
static UCHAR *ucMBFrame;
|
||
|
|
static UCHAR ucRcvAddress;
|
||
|
|
static UCHAR ucFunctionCode;
|
||
|
|
static USHORT usLength;
|
||
|
|
static eMBException eException;
|
||
|
|
|
||
|
|
int i;
|
||
|
|
eMBErrorCode eStatus = MB_ENOERR;
|
||
|
|
eMBEventType 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( xMBPortEventGet( &eEvent ) == TRUE )
|
||
|
|
{
|
||
|
|
switch ( eEvent )
|
||
|
|
{
|
||
|
|
case EV_READY:
|
||
|
|
break;
|
||
|
|
|
||
|
|
case EV_FRAME_RECEIVED:
|
||
|
|
eStatus = peMBFrameReceiveCur( &ucRcvAddress, &ucMBFrame, &usLength );
|
||
|
|
if( eStatus == MB_ENOERR )
|
||
|
|
{
|
||
|
|
/* Check if the frame is for us. If not ignore the frame. */
|
||
|
|
if( ( ucRcvAddress == ucMBAddress ) || ( ucRcvAddress == MB_ADDRESS_BROADCAST ) )
|
||
|
|
{
|
||
|
|
( void )xMBPortEventPost( EV_EXECUTE );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case EV_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( xFuncHandlers[i].ucFunctionCode == 0 )
|
||
|
|
{
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
else if( xFuncHandlers[i].ucFunctionCode == ucFunctionCode )
|
||
|
|
{
|
||
|
|
eException = xFuncHandlers[i].pxHandler( ucMBFrame, &usLength );
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* If the request was not sent to the broadcast address we
|
||
|
|
* return a reply. */
|
||
|
|
if( ucRcvAddress != MB_ADDRESS_BROADCAST )
|
||
|
|
{
|
||
|
|
if( eException != MB_EX_NONE )
|
||
|
|
{
|
||
|
|
/* An exception occurred. Build an error frame. */
|
||
|
|
usLength = 0;
|
||
|
|
ucMBFrame[usLength++] = ( UCHAR )( ucFunctionCode | MB_FUNC_ERROR );
|
||
|
|
ucMBFrame[usLength++] = eException;
|
||
|
|
}
|
||
|
|
if( ( eMBCurrentMode == MB_ASCII ) && MB_ASCII_TIMEOUT_WAIT_BEFORE_SEND_MS )
|
||
|
|
{
|
||
|
|
vMBPortTimersDelay( MB_ASCII_TIMEOUT_WAIT_BEFORE_SEND_MS );
|
||
|
|
}
|
||
|
|
eStatus = peMBFrameSendCur( ucMBAddress, ucMBFrame, usLength );
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case EV_FRAME_SENT:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return MB_ENOERR;
|
||
|
|
}
|