Yuji Hosogaya / Mbed 2 deprecated ModbusTCP_Modified

Modified version of ModbusTCP

Dependencies:   EthernetNetIf mbed

ModBus/mbtcp.cpp@3:d7d7c67f21fa, 2012-03-15 (annotated)

Committer:
paleskyjp
Date:
Thu Mar 15 15:28:14 2012 +0000
Revision:
3:d7d7c67f21fa
Parent:
0:62be54b8975d 
eMBRegCoilsCB was corrected.

(Implementation of writing single coil was wrong.)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
paleskyjp 0:62be54b8975d 1 /*
paleskyjp 0:62be54b8975d 2 * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
paleskyjp 0:62be54b8975d 3 * Copyright (c) 2006 Christian Walter <wolti@sil.at>
paleskyjp 0:62be54b8975d 4 * All rights reserved.
paleskyjp 0:62be54b8975d 5 *
paleskyjp 0:62be54b8975d 6 * Redistribution and use in source and binary forms, with or without
paleskyjp 0:62be54b8975d 7 * modification, are permitted provided that the following conditions
paleskyjp 0:62be54b8975d 8 * are met:
paleskyjp 0:62be54b8975d 9 * 1. Redistributions of source code must retain the above copyright
paleskyjp 0:62be54b8975d 10 * notice, this list of conditions and the following disclaimer.
paleskyjp 0:62be54b8975d 11 * 2. Redistributions in binary form must reproduce the above copyright
paleskyjp 0:62be54b8975d 12 * notice, this list of conditions and the following disclaimer in the
paleskyjp 0:62be54b8975d 13 * documentation and/or other materials provided with the distribution.
paleskyjp 0:62be54b8975d 14 * 3. The name of the author may not be used to endorse or promote products
paleskyjp 0:62be54b8975d 15 * derived from this software without specific prior written permission.
paleskyjp 0:62be54b8975d 16 *
paleskyjp 0:62be54b8975d 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
paleskyjp 0:62be54b8975d 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
paleskyjp 0:62be54b8975d 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
paleskyjp 0:62be54b8975d 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
paleskyjp 0:62be54b8975d 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
paleskyjp 0:62be54b8975d 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
paleskyjp 0:62be54b8975d 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
paleskyjp 0:62be54b8975d 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
paleskyjp 0:62be54b8975d 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
paleskyjp 0:62be54b8975d 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
paleskyjp 0:62be54b8975d 27 *
paleskyjp 0:62be54b8975d 28 * File: $Id: mbtcp.c,v 1.3 2006/12/07 22:10:34 wolti Exp $
paleskyjp 0:62be54b8975d 29 */
paleskyjp 0:62be54b8975d 30
paleskyjp 0:62be54b8975d 31 /* ----------------------- System includes ----------------------------------*/
paleskyjp 0:62be54b8975d 32 #include "stdlib.h"
paleskyjp 0:62be54b8975d 33 #include "string.h"
paleskyjp 0:62be54b8975d 34
paleskyjp 0:62be54b8975d 35 /* ----------------------- Platform includes --------------------------------*/
paleskyjp 0:62be54b8975d 36 #include "port.h"
paleskyjp 0:62be54b8975d 37
paleskyjp 0:62be54b8975d 38 /* ----------------------- Modbus includes ----------------------------------*/
paleskyjp 0:62be54b8975d 39 #include "mb.h"
paleskyjp 0:62be54b8975d 40 #include "mbconfig.h"
paleskyjp 0:62be54b8975d 41 #include "mbtcp.h"
paleskyjp 0:62be54b8975d 42 #include "mbframe.h"
paleskyjp 0:62be54b8975d 43 #include "mbport.h"
paleskyjp 0:62be54b8975d 44
paleskyjp 0:62be54b8975d 45 #if MB_TCP_ENABLED > 0
paleskyjp 0:62be54b8975d 46
paleskyjp 0:62be54b8975d 47 /* ----------------------- Defines ------------------------------------------*/
paleskyjp 0:62be54b8975d 48
paleskyjp 0:62be54b8975d 49 /* ----------------------- MBAP Header --------------------------------------*/
paleskyjp 0:62be54b8975d 50 /*
paleskyjp 0:62be54b8975d 51 *
paleskyjp 0:62be54b8975d 52 * <------------------------ MODBUS TCP/IP ADU(1) ------------------------->
paleskyjp 0:62be54b8975d 53 * <----------- MODBUS PDU (1') ---------------->
paleskyjp 0:62be54b8975d 54 * +-----------+---------------+------------------------------------------+
paleskyjp 0:62be54b8975d 55 * | TID | PID | Length | UID |Code | Data |
paleskyjp 0:62be54b8975d 56 * +-----------+---------------+------------------------------------------+
paleskyjp 0:62be54b8975d 57 * | | | | |
paleskyjp 0:62be54b8975d 58 * (2) (3) (4) (5) (6)
paleskyjp 0:62be54b8975d 59 *
paleskyjp 0:62be54b8975d 60 * (2) ... MB_TCP_TID = 0 (Transaction Identifier - 2 Byte)
paleskyjp 0:62be54b8975d 61 * (3) ... MB_TCP_PID = 2 (Protocol Identifier - 2 Byte)
paleskyjp 0:62be54b8975d 62 * (4) ... MB_TCP_LEN = 4 (Number of bytes - 2 Byte)
paleskyjp 0:62be54b8975d 63 * (5) ... MB_TCP_UID = 6 (Unit Identifier - 1 Byte)
paleskyjp 0:62be54b8975d 64 * (6) ... MB_TCP_FUNC = 7 (Modbus Function Code)
paleskyjp 0:62be54b8975d 65 *
paleskyjp 0:62be54b8975d 66 * (1) ... Modbus TCP/IP Application Data Unit
paleskyjp 0:62be54b8975d 67 * (1') ... Modbus Protocol Data Unit
paleskyjp 0:62be54b8975d 68 */
paleskyjp 0:62be54b8975d 69
paleskyjp 0:62be54b8975d 70 #define MB_TCP_TID 0
paleskyjp 0:62be54b8975d 71 #define MB_TCP_PID 2
paleskyjp 0:62be54b8975d 72 #define MB_TCP_LEN 4
paleskyjp 0:62be54b8975d 73 #define MB_TCP_UID 6
paleskyjp 0:62be54b8975d 74 #define MB_TCP_FUNC 7
paleskyjp 0:62be54b8975d 75
paleskyjp 0:62be54b8975d 76 #define MB_TCP_PROTOCOL_ID 0 /* 0 = Modbus Protocol */
paleskyjp 0:62be54b8975d 77
paleskyjp 0:62be54b8975d 78
paleskyjp 0:62be54b8975d 79 /* ----------------------- Start implementation -----------------------------*/
paleskyjp 0:62be54b8975d 80 eMBErrorCode
paleskyjp 0:62be54b8975d 81 eMBTCPDoInit( USHORT ucTCPPort )
paleskyjp 0:62be54b8975d 82 {
paleskyjp 0:62be54b8975d 83 eMBErrorCode eStatus = MB_ENOERR;
paleskyjp 0:62be54b8975d 84
paleskyjp 0:62be54b8975d 85 if( xMBTCPPortInit( ucTCPPort ) == FALSE )
paleskyjp 0:62be54b8975d 86 {
paleskyjp 0:62be54b8975d 87 eStatus = MB_EPORTERR;
paleskyjp 0:62be54b8975d 88 }
paleskyjp 0:62be54b8975d 89 return eStatus;
paleskyjp 0:62be54b8975d 90 }
paleskyjp 0:62be54b8975d 91
paleskyjp 0:62be54b8975d 92 void
paleskyjp 0:62be54b8975d 93 eMBTCPStart( void )
paleskyjp 0:62be54b8975d 94 {
paleskyjp 0:62be54b8975d 95 }
paleskyjp 0:62be54b8975d 96
paleskyjp 0:62be54b8975d 97 void
paleskyjp 0:62be54b8975d 98 eMBTCPStop( void )
paleskyjp 0:62be54b8975d 99 {
paleskyjp 0:62be54b8975d 100 /* Make sure that no more clients are connected. */
paleskyjp 0:62be54b8975d 101 vMBTCPPortDisable( );
paleskyjp 0:62be54b8975d 102 }
paleskyjp 0:62be54b8975d 103
paleskyjp 0:62be54b8975d 104 eMBErrorCode
paleskyjp 0:62be54b8975d 105 eMBTCPReceive( UCHAR * pucRcvAddress, UCHAR ** ppucFrame, USHORT * pusLength )
paleskyjp 0:62be54b8975d 106 {
paleskyjp 0:62be54b8975d 107 eMBErrorCode eStatus = MB_EIO;
paleskyjp 0:62be54b8975d 108 UCHAR *pucMBTCPFrame;
paleskyjp 0:62be54b8975d 109 USHORT usLength;
paleskyjp 0:62be54b8975d 110 USHORT usPID;
paleskyjp 0:62be54b8975d 111
paleskyjp 0:62be54b8975d 112 if( xMBTCPPortGetRequest( &pucMBTCPFrame, &usLength ) != FALSE )
paleskyjp 0:62be54b8975d 113 {
paleskyjp 0:62be54b8975d 114 usPID = pucMBTCPFrame[MB_TCP_PID] << 8U;
paleskyjp 0:62be54b8975d 115 usPID |= pucMBTCPFrame[MB_TCP_PID + 1];
paleskyjp 0:62be54b8975d 116
paleskyjp 0:62be54b8975d 117 if( usPID == MB_TCP_PROTOCOL_ID )
paleskyjp 0:62be54b8975d 118 {
paleskyjp 0:62be54b8975d 119 *ppucFrame = &pucMBTCPFrame[MB_TCP_FUNC];
paleskyjp 0:62be54b8975d 120 *pusLength = usLength - MB_TCP_FUNC;
paleskyjp 0:62be54b8975d 121 eStatus = MB_ENOERR;
paleskyjp 0:62be54b8975d 122
paleskyjp 0:62be54b8975d 123 /* Modbus TCP does not use any addresses. Fake the source address such
paleskyjp 0:62be54b8975d 124 * that the processing part deals with this frame.
paleskyjp 0:62be54b8975d 125 */
paleskyjp 0:62be54b8975d 126 *pucRcvAddress = MB_TCP_PSEUDO_ADDRESS;
paleskyjp 0:62be54b8975d 127 }
paleskyjp 0:62be54b8975d 128 }
paleskyjp 0:62be54b8975d 129 else
paleskyjp 0:62be54b8975d 130 {
paleskyjp 0:62be54b8975d 131 eStatus = MB_EIO;
paleskyjp 0:62be54b8975d 132 }
paleskyjp 0:62be54b8975d 133 return eStatus;
paleskyjp 0:62be54b8975d 134 }
paleskyjp 0:62be54b8975d 135
paleskyjp 0:62be54b8975d 136 eMBErrorCode
paleskyjp 0:62be54b8975d 137 eMBTCPSend( UCHAR _unused, const UCHAR * pucFrame, USHORT usLength )
paleskyjp 0:62be54b8975d 138 {
paleskyjp 0:62be54b8975d 139 eMBErrorCode eStatus = MB_ENOERR;
paleskyjp 0:62be54b8975d 140 UCHAR *pucMBTCPFrame = ( UCHAR * ) pucFrame - MB_TCP_FUNC;
paleskyjp 0:62be54b8975d 141 USHORT usTCPLength = usLength + MB_TCP_FUNC;
paleskyjp 0:62be54b8975d 142
paleskyjp 0:62be54b8975d 143 /* The MBAP header is already initialized because the caller calls this
paleskyjp 0:62be54b8975d 144 * function with the buffer returned by the previous call. Therefore we
paleskyjp 0:62be54b8975d 145 * only have to update the length in the header. Note that the length
paleskyjp 0:62be54b8975d 146 * header includes the size of the Modbus PDU and the UID Byte. Therefore
paleskyjp 0:62be54b8975d 147 * the length is usLength plus one.
paleskyjp 0:62be54b8975d 148 */
paleskyjp 0:62be54b8975d 149 pucMBTCPFrame[MB_TCP_LEN] = ( usLength + 1 ) >> 8U;
paleskyjp 0:62be54b8975d 150 pucMBTCPFrame[MB_TCP_LEN + 1] = ( usLength + 1 ) & 0xFF;
paleskyjp 0:62be54b8975d 151 if( xMBTCPPortSendResponse( pucMBTCPFrame, usTCPLength ) == FALSE )
paleskyjp 0:62be54b8975d 152 {
paleskyjp 0:62be54b8975d 153 eStatus = MB_EIO;
paleskyjp 0:62be54b8975d 154 }
paleskyjp 0:62be54b8975d 155 return eStatus;
paleskyjp 0:62be54b8975d 156 }
paleskyjp 0:62be54b8975d 157
paleskyjp 0:62be54b8975d 158 #endif