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122 lines
4.7 KiB
122 lines
4.7 KiB
/* |
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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: mbfuncinput.c,v 1.10 2007/09/12 10:15:56 wolti Exp $ |
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*/ |
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/* ----------------------- System includes ----------------------------------*/ |
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#include <nuttx/config.h> |
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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 <apps/modbus/mb.h> |
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#include <apps/modbus/mbframe.h> |
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#include <apps/modbus/mbproto.h> |
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/* ----------------------- Defines ------------------------------------------*/ |
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#define MB_PDU_FUNC_READ_ADDR_OFF ( MB_PDU_DATA_OFF ) |
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#define MB_PDU_FUNC_READ_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 ) |
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#define MB_PDU_FUNC_READ_SIZE ( 4 ) |
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#define MB_PDU_FUNC_READ_REGCNT_MAX ( 0x007D ) |
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#define MB_PDU_FUNC_READ_RSP_BYTECNT_OFF ( MB_PDU_DATA_OFF ) |
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/* ----------------------- Static functions ---------------------------------*/ |
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eMBException prveMBError2Exception( eMBErrorCode eErrorCode ); |
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/* ----------------------- Start implementation -----------------------------*/ |
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#ifdef CONFIG_MB_FUNC_READ_INPUT_ENABLED |
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eMBException |
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eMBFuncReadInputRegister( uint8_t * pucFrame, uint16_t * usLen ) |
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{ |
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uint16_t usRegAddress; |
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uint16_t usRegCount; |
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uint8_t *pucFrameCur; |
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eMBException eStatus = MB_EX_NONE; |
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eMBErrorCode eRegStatus; |
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if( *usLen == ( MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN ) ) |
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{ |
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usRegAddress = ( uint16_t )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 ); |
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usRegAddress |= ( uint16_t )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] ); |
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usRegAddress++; |
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usRegCount = ( uint16_t )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF] << 8 ); |
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usRegCount |= ( uint16_t )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF + 1] ); |
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/* Check if the number of registers to read is valid. If not |
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* return Modbus illegal data value exception. |
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*/ |
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if( ( usRegCount >= 1 ) |
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&& ( usRegCount < MB_PDU_FUNC_READ_REGCNT_MAX ) ) |
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{ |
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/* Set the current PDU data pointer to the beginning. */ |
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pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF]; |
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*usLen = MB_PDU_FUNC_OFF; |
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/* First byte contains the function code. */ |
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*pucFrameCur++ = MB_FUNC_READ_INPUT_REGISTER; |
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*usLen += 1; |
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/* Second byte in the response contain the number of bytes. */ |
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*pucFrameCur++ = ( uint8_t )( usRegCount * 2 ); |
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*usLen += 1; |
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eRegStatus = |
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eMBRegInputCB( pucFrameCur, usRegAddress, usRegCount ); |
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/* If an error occured convert it into a Modbus exception. */ |
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if( eRegStatus != MB_ENOERR ) |
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{ |
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eStatus = prveMBError2Exception( eRegStatus ); |
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} |
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else |
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{ |
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*usLen += usRegCount * 2; |
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} |
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} |
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else |
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{ |
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eStatus = MB_EX_ILLEGAL_DATA_VALUE; |
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} |
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} |
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else |
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{ |
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/* Can't be a valid read input register request because the length |
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* is incorrect. */ |
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eStatus = MB_EX_ILLEGAL_DATA_VALUE; |
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} |
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return eStatus; |
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} |
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#endif
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