139 lines
4.9 KiB
C
139 lines
4.9 KiB
C
/****************************************************************************
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* apps/functions/mbfuncinput.c
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*
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* FreeModbus Library: 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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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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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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#include "port.h"
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#include "modbus/mb.h"
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#include "modbus/mbframe.h"
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#include "modbus/mbproto.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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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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/****************************************************************************
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* External Function Prototypes
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****************************************************************************/
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eMBException prveMBError2Exception(eMBErrorCode eErrorCode);
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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#ifdef CONFIG_MB_FUNC_READ_INPUT_ENABLED
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eMBException 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 = eMBRegInputCB(pucFrameCur, usRegAddress, usRegCount);
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/* If an error occurred 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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*/
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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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