ModbusTCP - Modbus RTU/ASCII/TCP with lwip TCP working parti…

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Athanassios Mavrogeorgiadis / Mbed 2 deprecated ModbusTCP

Modbus RTU/ASCII/TCP with lwip TCP working partial, but with errors (retransmitions)

ModBus/mbfuncinput.cpp@0:f54e9507171b, 2011-12-05 (annotated)

Committer:: tmav123
Date:: Mon Dec 05 22:49:02 2011 +0000
Revision:: 0:f54e9507171b

Who changed what in which revision?

User	Revision	Line number	New contents of line
tmav123	0:f54e9507171b	1	/*
tmav123	0:f54e9507171b	2	* FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
tmav123	0:f54e9507171b	3	* Copyright (c) 2006 Christian Walter <wolti@sil.at>
tmav123	0:f54e9507171b	4	* All rights reserved.
tmav123	0:f54e9507171b	5	*
tmav123	0:f54e9507171b	6	* Redistribution and use in source and binary forms, with or without
tmav123	0:f54e9507171b	7	* modification, are permitted provided that the following conditions
tmav123	0:f54e9507171b	8	* are met:
tmav123	0:f54e9507171b	9	* 1. Redistributions of source code must retain the above copyright
tmav123	0:f54e9507171b	10	* notice, this list of conditions and the following disclaimer.
tmav123	0:f54e9507171b	11	* 2. Redistributions in binary form must reproduce the above copyright
tmav123	0:f54e9507171b	12	* notice, this list of conditions and the following disclaimer in the
tmav123	0:f54e9507171b	13	* documentation and/or other materials provided with the distribution.
tmav123	0:f54e9507171b	14	* 3. The name of the author may not be used to endorse or promote products
tmav123	0:f54e9507171b	15	* derived from this software without specific prior written permission.
tmav123	0:f54e9507171b	16	*
tmav123	0:f54e9507171b	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
tmav123	0:f54e9507171b	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
tmav123	0:f54e9507171b	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
tmav123	0:f54e9507171b	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
tmav123	0:f54e9507171b	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
tmav123	0:f54e9507171b	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
tmav123	0:f54e9507171b	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
tmav123	0:f54e9507171b	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
tmav123	0:f54e9507171b	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
tmav123	0:f54e9507171b	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
tmav123	0:f54e9507171b	27	*
tmav123	0:f54e9507171b	28	* File: $Id: mbfuncinput.c,v 1.10 2007/09/12 10:15:56 wolti Exp $
tmav123	0:f54e9507171b	29	*/
tmav123	0:f54e9507171b	30
tmav123	0:f54e9507171b	31	/* ----------------------- System includes ----------------------------------*/
tmav123	0:f54e9507171b	32	#include "stdlib.h"
tmav123	0:f54e9507171b	33	#include "string.h"
tmav123	0:f54e9507171b	34
tmav123	0:f54e9507171b	35	/* ----------------------- Platform includes --------------------------------*/
tmav123	0:f54e9507171b	36	#include "port.h"
tmav123	0:f54e9507171b	37
tmav123	0:f54e9507171b	38	/* ----------------------- Modbus includes ----------------------------------*/
tmav123	0:f54e9507171b	39	#include "mb.h"
tmav123	0:f54e9507171b	40	#include "mbframe.h"
tmav123	0:f54e9507171b	41	#include "mbproto.h"
tmav123	0:f54e9507171b	42	#include "mbconfig.h"
tmav123	0:f54e9507171b	43
tmav123	0:f54e9507171b	44	/* ----------------------- Defines ------------------------------------------*/
tmav123	0:f54e9507171b	45	#define MB_PDU_FUNC_READ_ADDR_OFF ( MB_PDU_DATA_OFF )
tmav123	0:f54e9507171b	46	#define MB_PDU_FUNC_READ_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 )
tmav123	0:f54e9507171b	47	#define MB_PDU_FUNC_READ_SIZE ( 4 )
tmav123	0:f54e9507171b	48	#define MB_PDU_FUNC_READ_REGCNT_MAX ( 0x007D )
tmav123	0:f54e9507171b	49
tmav123	0:f54e9507171b	50	#define MB_PDU_FUNC_READ_RSP_BYTECNT_OFF ( MB_PDU_DATA_OFF )
tmav123	0:f54e9507171b	51
tmav123	0:f54e9507171b	52	/* ----------------------- Static functions ---------------------------------*/
tmav123	0:f54e9507171b	53	eMBException prveMBError2Exception( eMBErrorCode eErrorCode );
tmav123	0:f54e9507171b	54
tmav123	0:f54e9507171b	55	/* ----------------------- Start implementation -----------------------------*/
tmav123	0:f54e9507171b	56	#if MB_FUNC_READ_INPUT_ENABLED > 0
tmav123	0:f54e9507171b	57
tmav123	0:f54e9507171b	58	eMBException
tmav123	0:f54e9507171b	59	eMBFuncReadInputRegister( UCHAR * pucFrame, USHORT * usLen )
tmav123	0:f54e9507171b	60	{
tmav123	0:f54e9507171b	61	USHORT usRegAddress;
tmav123	0:f54e9507171b	62	USHORT usRegCount;
tmav123	0:f54e9507171b	63	UCHAR *pucFrameCur;
tmav123	0:f54e9507171b	64
tmav123	0:f54e9507171b	65	eMBException eStatus = MB_EX_NONE;
tmav123	0:f54e9507171b	66	eMBErrorCode eRegStatus;
tmav123	0:f54e9507171b	67
tmav123	0:f54e9507171b	68	if( *usLen == ( MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN ) )
tmav123	0:f54e9507171b	69	{
tmav123	0:f54e9507171b	70	usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 );
tmav123	0:f54e9507171b	71	usRegAddress \|= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] );
tmav123	0:f54e9507171b	72	usRegAddress++;
tmav123	0:f54e9507171b	73
tmav123	0:f54e9507171b	74	usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF] << 8 );
tmav123	0:f54e9507171b	75	usRegCount \|= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF + 1] );
tmav123	0:f54e9507171b	76
tmav123	0:f54e9507171b	77	/* Check if the number of registers to read is valid. If not
tmav123	0:f54e9507171b	78	* return Modbus illegal data value exception.
tmav123	0:f54e9507171b	79	*/
tmav123	0:f54e9507171b	80	if( ( usRegCount >= 1 )
tmav123	0:f54e9507171b	81	&& ( usRegCount < MB_PDU_FUNC_READ_REGCNT_MAX ) )
tmav123	0:f54e9507171b	82	{
tmav123	0:f54e9507171b	83	/* Set the current PDU data pointer to the beginning. */
tmav123	0:f54e9507171b	84	pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF];
tmav123	0:f54e9507171b	85	*usLen = MB_PDU_FUNC_OFF;
tmav123	0:f54e9507171b	86
tmav123	0:f54e9507171b	87	/* First byte contains the function code. */
tmav123	0:f54e9507171b	88	*pucFrameCur++ = MB_FUNC_READ_INPUT_REGISTER;
tmav123	0:f54e9507171b	89	*usLen += 1;
tmav123	0:f54e9507171b	90
tmav123	0:f54e9507171b	91	/* Second byte in the response contain the number of bytes. */
tmav123	0:f54e9507171b	92	pucFrameCur++ = ( UCHAR )( usRegCount 2 );
tmav123	0:f54e9507171b	93	*usLen += 1;
tmav123	0:f54e9507171b	94
tmav123	0:f54e9507171b	95	eRegStatus = eMBRegInputCB( pucFrameCur, usRegAddress, usRegCount );
tmav123	0:f54e9507171b	96
tmav123	0:f54e9507171b	97	/* If an error occured convert it into a Modbus exception. */
tmav123	0:f54e9507171b	98	if( eRegStatus != MB_ENOERR )
tmav123	0:f54e9507171b	99	{
tmav123	0:f54e9507171b	100	eStatus = prveMBError2Exception( eRegStatus );
tmav123	0:f54e9507171b	101	}
tmav123	0:f54e9507171b	102	else
tmav123	0:f54e9507171b	103	{
tmav123	0:f54e9507171b	104	usLen += usRegCount 2;
tmav123	0:f54e9507171b	105	}
tmav123	0:f54e9507171b	106	}
tmav123	0:f54e9507171b	107	else
tmav123	0:f54e9507171b	108	{
tmav123	0:f54e9507171b	109	eStatus = MB_EX_ILLEGAL_DATA_VALUE;
tmav123	0:f54e9507171b	110	}
tmav123	0:f54e9507171b	111	}
tmav123	0:f54e9507171b	112	else
tmav123	0:f54e9507171b	113	{
tmav123	0:f54e9507171b	114	/* Can't be a valid read input register request because the length
tmav123	0:f54e9507171b	115	* is incorrect. */
tmav123	0:f54e9507171b	116	eStatus = MB_EX_ILLEGAL_DATA_VALUE;
tmav123	0:f54e9507171b	117	}
tmav123	0:f54e9507171b	118	return eStatus;
tmav123	0:f54e9507171b	119	}
tmav123	0:f54e9507171b	120
tmav123	0:f54e9507171b	121	#endif

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	05 Dec 2011
Imports:	271
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	2
Followers:	17

ModBus/mbfuncinput.cpp@0:f54e9507171b, 2011-12-05 (annotated)

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