Rajit Singh / Mbed OS Modbus

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Dependents:   NUCLEO-F401-printf

mbfuncinput.cpp@1:3e360cf155b6, 2017-08-16 (annotated)

Committer:
Rajit Singh
Date:
Wed Aug 16 17:31:26 2017 +0100
Revision:
1:3e360cf155b6
Parent:
0:9db3bed8fffd 
Remove main.cpp

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Rajit Singh 0:9db3bed8fffd 1 /*
Rajit Singh 0:9db3bed8fffd 2 * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
Rajit Singh 0:9db3bed8fffd 3 * Copyright (c) 2006 Christian Walter <wolti@sil.at>
Rajit Singh 0:9db3bed8fffd 4 * All rights reserved.
Rajit Singh 0:9db3bed8fffd 5 *
Rajit Singh 0:9db3bed8fffd 6 * Redistribution and use in source and binary forms, with or without
Rajit Singh 0:9db3bed8fffd 7 * modification, are permitted provided that the following conditions
Rajit Singh 0:9db3bed8fffd 8 * are met:
Rajit Singh 0:9db3bed8fffd 9 * 1. Redistributions of source code must retain the above copyright
Rajit Singh 0:9db3bed8fffd 10 * notice, this list of conditions and the following disclaimer.
Rajit Singh 0:9db3bed8fffd 11 * 2. Redistributions in binary form must reproduce the above copyright
Rajit Singh 0:9db3bed8fffd 12 * notice, this list of conditions and the following disclaimer in the
Rajit Singh 0:9db3bed8fffd 13 * documentation and/or other materials provided with the distribution.
Rajit Singh 0:9db3bed8fffd 14 * 3. The name of the author may not be used to endorse or promote products
Rajit Singh 0:9db3bed8fffd 15 * derived from this software without specific prior written permission.
Rajit Singh 0:9db3bed8fffd 16 *
Rajit Singh 0:9db3bed8fffd 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
Rajit Singh 0:9db3bed8fffd 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
Rajit Singh 0:9db3bed8fffd 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
Rajit Singh 0:9db3bed8fffd 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
Rajit Singh 0:9db3bed8fffd 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
Rajit Singh 0:9db3bed8fffd 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
Rajit Singh 0:9db3bed8fffd 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
Rajit Singh 0:9db3bed8fffd 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
Rajit Singh 0:9db3bed8fffd 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
Rajit Singh 0:9db3bed8fffd 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Rajit Singh 0:9db3bed8fffd 27 *
Rajit Singh 0:9db3bed8fffd 28 * File: $Id: mbfuncinput.c,v 1.10 2007/09/12 10:15:56 wolti Exp $
Rajit Singh 0:9db3bed8fffd 29 */
Rajit Singh 0:9db3bed8fffd 30
Rajit Singh 0:9db3bed8fffd 31 /* ----------------------- System includes ----------------------------------*/
Rajit Singh 0:9db3bed8fffd 32 #include "stdlib.h"
Rajit Singh 0:9db3bed8fffd 33 #include "string.h"
Rajit Singh 0:9db3bed8fffd 34
Rajit Singh 0:9db3bed8fffd 35 /* ----------------------- Platform includes --------------------------------*/
Rajit Singh 0:9db3bed8fffd 36 #include "port.h"
Rajit Singh 0:9db3bed8fffd 37
Rajit Singh 0:9db3bed8fffd 38 /* ----------------------- Modbus includes ----------------------------------*/
Rajit Singh 0:9db3bed8fffd 39 #include "mb.h"
Rajit Singh 0:9db3bed8fffd 40 #include "mbframe.h"
Rajit Singh 0:9db3bed8fffd 41 #include "mbproto.h"
Rajit Singh 0:9db3bed8fffd 42 #include "mbconfig.h"
Rajit Singh 0:9db3bed8fffd 43
Rajit Singh 0:9db3bed8fffd 44 /* ----------------------- Defines ------------------------------------------*/
Rajit Singh 0:9db3bed8fffd 45 #define MB_PDU_FUNC_READ_ADDR_OFF ( MB_PDU_DATA_OFF )
Rajit Singh 0:9db3bed8fffd 46 #define MB_PDU_FUNC_READ_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 )
Rajit Singh 0:9db3bed8fffd 47 #define MB_PDU_FUNC_READ_SIZE ( 4 )
Rajit Singh 0:9db3bed8fffd 48 #define MB_PDU_FUNC_READ_REGCNT_MAX ( 0x007D )
Rajit Singh 0:9db3bed8fffd 49
Rajit Singh 0:9db3bed8fffd 50 #define MB_PDU_FUNC_READ_RSP_BYTECNT_OFF ( MB_PDU_DATA_OFF )
Rajit Singh 0:9db3bed8fffd 51
Rajit Singh 0:9db3bed8fffd 52 /* ----------------------- Static functions ---------------------------------*/
Rajit Singh 0:9db3bed8fffd 53 eMBException prveMBError2Exception( eMBErrorCode eErrorCode );
Rajit Singh 0:9db3bed8fffd 54
Rajit Singh 0:9db3bed8fffd 55 /* ----------------------- Start implementation -----------------------------*/
Rajit Singh 0:9db3bed8fffd 56 #if MB_FUNC_READ_INPUT_ENABLED > 0
Rajit Singh 0:9db3bed8fffd 57
Rajit Singh 0:9db3bed8fffd 58 eMBException
Rajit Singh 0:9db3bed8fffd 59 eMBFuncReadInputRegister( UCHAR * pucFrame, USHORT * usLen )
Rajit Singh 0:9db3bed8fffd 60 {
Rajit Singh 0:9db3bed8fffd 61 USHORT usRegAddress;
Rajit Singh 0:9db3bed8fffd 62 USHORT usRegCount;
Rajit Singh 0:9db3bed8fffd 63 UCHAR *pucFrameCur;
Rajit Singh 0:9db3bed8fffd 64
Rajit Singh 0:9db3bed8fffd 65 eMBException eStatus = MB_EX_NONE;
Rajit Singh 0:9db3bed8fffd 66 eMBErrorCode eRegStatus;
Rajit Singh 0:9db3bed8fffd 67
Rajit Singh 0:9db3bed8fffd 68 if( *usLen == ( MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN ) )
Rajit Singh 0:9db3bed8fffd 69 {
Rajit Singh 0:9db3bed8fffd 70 usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 );
Rajit Singh 0:9db3bed8fffd 71 usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] );
Rajit Singh 0:9db3bed8fffd 72 usRegAddress++;
Rajit Singh 0:9db3bed8fffd 73
Rajit Singh 0:9db3bed8fffd 74 usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF] << 8 );
Rajit Singh 0:9db3bed8fffd 75 usRegCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF + 1] );
Rajit Singh 0:9db3bed8fffd 76
Rajit Singh 0:9db3bed8fffd 77 /* Check if the number of registers to read is valid. If not
Rajit Singh 0:9db3bed8fffd 78 * return Modbus illegal data value exception.
Rajit Singh 0:9db3bed8fffd 79 */
Rajit Singh 0:9db3bed8fffd 80 if( ( usRegCount >= 1 )
Rajit Singh 0:9db3bed8fffd 81 && ( usRegCount < MB_PDU_FUNC_READ_REGCNT_MAX ) )
Rajit Singh 0:9db3bed8fffd 82 {
Rajit Singh 0:9db3bed8fffd 83 /* Set the current PDU data pointer to the beginning. */
Rajit Singh 0:9db3bed8fffd 84 pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF];
Rajit Singh 0:9db3bed8fffd 85 *usLen = MB_PDU_FUNC_OFF;
Rajit Singh 0:9db3bed8fffd 86
Rajit Singh 0:9db3bed8fffd 87 /* First byte contains the function code. */
Rajit Singh 0:9db3bed8fffd 88 *pucFrameCur++ = MB_FUNC_READ_INPUT_REGISTER;
Rajit Singh 0:9db3bed8fffd 89 *usLen += 1;
Rajit Singh 0:9db3bed8fffd 90
Rajit Singh 0:9db3bed8fffd 91 /* Second byte in the response contain the number of bytes. */
Rajit Singh 0:9db3bed8fffd 92 *pucFrameCur++ = ( UCHAR )( usRegCount * 2 );
Rajit Singh 0:9db3bed8fffd 93 *usLen += 1;
Rajit Singh 0:9db3bed8fffd 94
Rajit Singh 0:9db3bed8fffd 95 eRegStatus = eMBRegInputCB( pucFrameCur, usRegAddress, usRegCount );
Rajit Singh 0:9db3bed8fffd 96
Rajit Singh 0:9db3bed8fffd 97 /* If an error occured convert it into a Modbus exception. */
Rajit Singh 0:9db3bed8fffd 98 if( eRegStatus != MB_ENOERR )
Rajit Singh 0:9db3bed8fffd 99 {
Rajit Singh 0:9db3bed8fffd 100 eStatus = prveMBError2Exception( eRegStatus );
Rajit Singh 0:9db3bed8fffd 101 }
Rajit Singh 0:9db3bed8fffd 102 else
Rajit Singh 0:9db3bed8fffd 103 {
Rajit Singh 0:9db3bed8fffd 104 *usLen += usRegCount * 2;
Rajit Singh 0:9db3bed8fffd 105 }
Rajit Singh 0:9db3bed8fffd 106 }
Rajit Singh 0:9db3bed8fffd 107 else
Rajit Singh 0:9db3bed8fffd 108 {
Rajit Singh 0:9db3bed8fffd 109 eStatus = MB_EX_ILLEGAL_DATA_VALUE;
Rajit Singh 0:9db3bed8fffd 110 }
Rajit Singh 0:9db3bed8fffd 111 }
Rajit Singh 0:9db3bed8fffd 112 else
Rajit Singh 0:9db3bed8fffd 113 {
Rajit Singh 0:9db3bed8fffd 114 /* Can't be a valid read input register request because the length
Rajit Singh 0:9db3bed8fffd 115 * is incorrect. */
Rajit Singh 0:9db3bed8fffd 116 eStatus = MB_EX_ILLEGAL_DATA_VALUE;
Rajit Singh 0:9db3bed8fffd 117 }
Rajit Singh 0:9db3bed8fffd 118 return eStatus;
Rajit Singh 0:9db3bed8fffd 119 }
Rajit Singh 0:9db3bed8fffd 120
Rajit Singh 0:9db3bed8fffd 121 #endif