基于ATMega16的freemodbus主站程序移植

/* * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU. * Copyright (c) 2006 Christian Walter <wolti@sil.at> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * File: $Id: mbfuncholding.c,v 1.12 2007/02/18 23:48:22 wolti Exp $ */ /* ----------------------- System includes ----------------------------------*/ #include "stdlib.h" #include "string.h" /* ----------------------- Platform includes --------------------------------*/ #include "port.h" /* ----------------------- Modbus includes ----------------------------------*/ #include "mb.h" #include "mbframe.h" #include "mbproto.h" #include "mbconfig.h" /* ----------------------- Defines ------------------------------------------*/ #define MB_PDU_FUNC_READ_ADDR_OFF ( MB_PDU_DATA_OFF + 0) #define MB_PDU_FUNC_READ_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 ) #define MB_PDU_FUNC_READ_SIZE ( 4 ) #define MB_PDU_FUNC_READ_REGCNT_MAX ( 0x007D ) #define MB_PDU_FUNC_WRITE_ADDR_OFF ( MB_PDU_DATA_OFF + 0) #define MB_PDU_FUNC_WRITE_VALUE_OFF ( MB_PDU_DATA_OFF + 2 ) #define MB_PDU_FUNC_WRITE_SIZE ( 4 ) #define MB_PDU_FUNC_WRITE_MUL_ADDR_OFF ( MB_PDU_DATA_OFF + 0 ) #define MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 ) #define MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF ( MB_PDU_DATA_OFF + 4 ) #define MB_PDU_FUNC_WRITE_MUL_VALUES_OFF ( MB_PDU_DATA_OFF + 5 ) #define MB_PDU_FUNC_WRITE_MUL_SIZE_MIN ( 5 ) #define MB_PDU_FUNC_WRITE_MUL_REGCNT_MAX ( 0x0078 ) #define MB_PDU_FUNC_READWRITE_READ_ADDR_OFF ( MB_PDU_DATA_OFF + 0 ) #define MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 ) #define MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF ( MB_PDU_DATA_OFF + 4 ) #define MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF ( MB_PDU_DATA_OFF + 6 ) #define MB_PDU_FUNC_READWRITE_BYTECNT_OFF ( MB_PDU_DATA_OFF + 8 ) #define MB_PDU_FUNC_READWRITE_WRITE_VALUES_OFF ( MB_PDU_DATA_OFF + 9 ) #define MB_PDU_FUNC_READWRITE_SIZE_MIN ( 9 ) /* ----------------------- Static functions ---------------------------------*/ eMBException prveMBError2Exception( eMBErrorCode eErrorCode ); /* ----------------------- Start implementation -----------------------------*/ #if MB_FUNC_WRITE_HOLDING_ENABLED > 0 eMBException eMBFuncWriteHoldingRegister( UCHAR * pucFrame, USHORT * usLen ) { USHORT usRegAddress; eMBException eStatus = MB_EX_NONE; eMBErrorCode eRegStatus; if( *usLen == ( MB_PDU_FUNC_WRITE_SIZE + MB_PDU_SIZE_MIN ) ) { usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF] << 8 ); usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF + 1] ); usRegAddress++; /* Make callback to update the value. */ eRegStatus = eMBRegHoldingCB( &pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF], usRegAddress, 1, MB_REG_WRITE ); /* If an error occured convert it into a Modbus exception. */ if( eRegStatus != MB_ENOERR ) { eStatus = prveMBError2Exception( eRegStatus ); } } else { /* Can't be a valid request because the length is incorrect. */ eStatus = MB_EX_ILLEGAL_DATA_VALUE; } return eStatus; } #endif #if MB_FUNC_WRITE_MULTIPLE_HOLDING_ENABLED > 0 eMBException eMBFuncWriteMultipleHoldingRegister( UCHAR * pucFrame, USHORT * usLen ) { USHORT usRegAddress; USHORT usRegCount; UCHAR ucRegByteCount; eMBException eStatus = MB_EX_NONE; eMBErrorCode eRegStatus; if( *usLen >= ( MB_PDU_FUNC_WRITE_MUL_SIZE_MIN + MB_PDU_SIZE_MIN ) ) { usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF] << 8 ); usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF + 1] ); usRegAddress++; usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF] << 8 ); usRegCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF + 1] ); ucRegByteCount = pucFrame[MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF]; if( ( usRegCount >= 1 ) && ( usRegCount <= MB_PDU_FUNC_WRITE_MUL_REGCNT_MAX ) && ( ucRegByteCount == ( UCHAR ) ( 2 * usRegCount ) ) ) { /* Make callback to update the register values. */ eRegStatus = eMBRegHoldingCB( &pucFrame[MB_PDU_FUNC_WRITE_MUL_VALUES_OFF], usRegAddress, usRegCount, MB_REG_WRITE ); /* If an error occured convert it into a Modbus exception. */ if( eRegStatus != MB_ENOERR ) { eStatus = prveMBError2Exception( eRegStatus ); } else { /* The response contains the function code, the starting * address and the quantity of registers. We reuse the * old values in the buffer because they are still valid. */ *usLen = MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF; } } else { eStatus = MB_EX_ILLEGAL_DATA_VALUE; } } else { /* Can't be a valid request because the length is incorrect. */ eStatus = MB_EX_ILLEGAL_DATA_VALUE; } return eStatus; } #endif #if MB_FUNC_READ_HOLDING_ENABLED > 0 eMBException eMBFuncReadHoldingRegister( UCHAR * pucFrame, USHORT * usLen ) { USHORT usRegAddress; USHORT usRegCount; UCHAR *pucFrameCur; eMBException eStatus = MB_EX_NONE; eMBErrorCode eRegStatus; if( *usLen == ( MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN ) ) { usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 ); usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] ); usRegAddress++; usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF] << 8 ); usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF + 1] ); /* Check if the number of registers to read is valid. If not * return Modbus illegal data value exception. */ if( ( usRegCount >= 1 ) && ( usRegCount <= MB_PDU_FUNC_READ_REGCNT_MAX ) ) { /* Set the current PDU data pointer to the beginning. */ pucFrameCur = &pucFrame[MB_PD