f0eb9985b9
This example adds functionality to support basic communication in RS485 networks using Modbus protocol. This example uses FreeModbus stack and regular UART driver API to communicate in RS485 half duplex mode. Added initial support of modbus controller pure C api to access device parameters over Modbus transport. Move freemodbus stack and port files into components folder Move the modbus_controller interface into components idf folder Source files updated after review. Add modbus interface documentation docs/en/api-reference/protocols/modbus.rst porttimer.c: fix bug with timer1 selected in the Kconfig Add support of cmake system (added cmake files) Closes https://github.com/espressif/esp-idf/issues/858
270 lines
9.4 KiB
C
270 lines
9.4 KiB
C
/*
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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: mbfunccoils.c,v 1.8 2007/02/18 23:47:16 wolti Exp $
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*/
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/* ----------------------- System includes ----------------------------------*/
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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 "mb.h"
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#include "mbframe.h"
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#include "mbproto.h"
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#include "mbconfig.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_COILCNT_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_COILCNT_MAX ( 0x07D0 )
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#define MB_PDU_FUNC_WRITE_ADDR_OFF ( MB_PDU_DATA_OFF )
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#define MB_PDU_FUNC_WRITE_VALUE_OFF ( MB_PDU_DATA_OFF + 2 )
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#define MB_PDU_FUNC_WRITE_SIZE ( 4 )
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#define MB_PDU_FUNC_WRITE_MUL_ADDR_OFF ( MB_PDU_DATA_OFF )
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#define MB_PDU_FUNC_WRITE_MUL_COILCNT_OFF ( MB_PDU_DATA_OFF + 2 )
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#define MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF ( MB_PDU_DATA_OFF + 4 )
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#define MB_PDU_FUNC_WRITE_MUL_VALUES_OFF ( MB_PDU_DATA_OFF + 5 )
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#define MB_PDU_FUNC_WRITE_MUL_SIZE_MIN ( 5 )
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#define MB_PDU_FUNC_WRITE_MUL_COILCNT_MAX ( 0x07B0 )
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/* ----------------------- Static functions ---------------------------------*/
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eMBException prveMBError2Exception( eMBErrorCode eErrorCode );
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/* ----------------------- Start implementation -----------------------------*/
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#if MB_FUNC_READ_COILS_ENABLED > 0
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eMBException
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eMBFuncReadCoils( UCHAR * pucFrame, USHORT * usLen )
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{
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USHORT usRegAddress;
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USHORT usCoilCount;
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UCHAR ucNBytes;
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UCHAR *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 = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 );
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usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] );
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usRegAddress++;
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usCoilCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_COILCNT_OFF] << 8 );
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usCoilCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_COILCNT_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( ( usCoilCount >= 1 ) &&
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( usCoilCount < MB_PDU_FUNC_READ_COILCNT_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_COILS;
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*usLen += 1;
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/* Test if the quantity of coils is a multiple of 8. If not last
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* byte is only partially field with unused coils set to zero. */
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if( ( usCoilCount & 0x0007 ) != 0 )
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{
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ucNBytes = ( UCHAR )( usCoilCount / 8 + 1 );
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}
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else
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{
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ucNBytes = ( UCHAR )( usCoilCount / 8 );
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}
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*pucFrameCur++ = ucNBytes;
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*usLen += 1;
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eRegStatus =
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eMBRegCoilsCB( pucFrameCur, usRegAddress, usCoilCount,
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MB_REG_READ );
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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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/* The response contains the function code, the starting address
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* and the quantity of registers. We reuse the old values in the
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* buffer because they are still valid. */
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*usLen += ucNBytes;;
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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 coil 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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#if MB_FUNC_WRITE_COIL_ENABLED > 0
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eMBException
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eMBFuncWriteCoil( UCHAR * pucFrame, USHORT * usLen )
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{
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USHORT usRegAddress;
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UCHAR ucBuf[2];
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eMBException eStatus = MB_EX_NONE;
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eMBErrorCode eRegStatus;
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if( *usLen == ( MB_PDU_FUNC_WRITE_SIZE + MB_PDU_SIZE_MIN ) )
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{
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usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF] << 8 );
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usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF + 1] );
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usRegAddress++;
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if( ( pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF + 1] == 0x00 ) &&
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( ( pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF] == 0xFF ) ||
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( pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF] == 0x00 ) ) )
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{
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ucBuf[1] = 0;
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if( pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF] == 0xFF )
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{
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ucBuf[0] = 1;
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}
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else
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{
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ucBuf[0] = 0;
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}
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eRegStatus =
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eMBRegCoilsCB( &ucBuf[0], usRegAddress, 1, MB_REG_WRITE );
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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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}
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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 write coil 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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#if MB_FUNC_WRITE_MULTIPLE_COILS_ENABLED > 0
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eMBException
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eMBFuncWriteMultipleCoils( UCHAR * pucFrame, USHORT * usLen )
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{
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USHORT usRegAddress;
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USHORT usCoilCnt;
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UCHAR ucByteCount;
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UCHAR ucByteCountVerify;
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eMBException eStatus = MB_EX_NONE;
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eMBErrorCode eRegStatus;
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if( *usLen > ( MB_PDU_FUNC_WRITE_SIZE + MB_PDU_SIZE_MIN ) )
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{
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usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF] << 8 );
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usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF + 1] );
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usRegAddress++;
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usCoilCnt = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_COILCNT_OFF] << 8 );
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usCoilCnt |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_COILCNT_OFF + 1] );
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ucByteCount = pucFrame[MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF];
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/* Compute the number of expected bytes in the request. */
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if( ( usCoilCnt & 0x0007 ) != 0 )
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{
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ucByteCountVerify = ( UCHAR )( usCoilCnt / 8 + 1 );
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}
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else
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{
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ucByteCountVerify = ( UCHAR )( usCoilCnt / 8 );
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}
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if( ( usCoilCnt >= 1 ) &&
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( usCoilCnt <= MB_PDU_FUNC_WRITE_MUL_COILCNT_MAX ) &&
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( ucByteCountVerify == ucByteCount ) )
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{
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eRegStatus =
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eMBRegCoilsCB( &pucFrame[MB_PDU_FUNC_WRITE_MUL_VALUES_OFF],
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usRegAddress, usCoilCnt, MB_REG_WRITE );
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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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/* The response contains the function code, the starting address
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* and the quantity of registers. We reuse the old values in the
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* buffer because they are still valid. */
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*usLen = MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF;
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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 write coil 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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#endif
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