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
141 lines
4.8 KiB
C
141 lines
4.8 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: mbutils.c,v 1.6 2007/02/18 23:49:07 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 "mbproto.h"
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/* ----------------------- Defines ------------------------------------------*/
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#define BITS_UCHAR 8U
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/* ----------------------- Start implementation -----------------------------*/
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void
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xMBUtilSetBits( UCHAR * ucByteBuf, USHORT usBitOffset, UCHAR ucNBits,
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UCHAR ucValue )
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{
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USHORT usWordBuf;
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USHORT usMask;
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USHORT usByteOffset;
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USHORT usNPreBits;
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USHORT usValue = ucValue;
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assert( ucNBits <= 8 );
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assert( ( size_t )BITS_UCHAR == sizeof( UCHAR ) * 8 );
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/* Calculate byte offset for first byte containing the bit values starting
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* at usBitOffset. */
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usByteOffset = ( USHORT )( ( usBitOffset ) / BITS_UCHAR );
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/* How many bits precede our bits to set. */
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usNPreBits = ( USHORT )( usBitOffset - usByteOffset * BITS_UCHAR );
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/* Move bit field into position over bits to set */
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usValue <<= usNPreBits;
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/* Prepare a mask for setting the new bits. */
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usMask = ( USHORT )( ( 1 << ( USHORT ) ucNBits ) - 1 );
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usMask <<= usBitOffset - usByteOffset * BITS_UCHAR;
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/* copy bits into temporary storage. */
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usWordBuf = ucByteBuf[usByteOffset];
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usWordBuf |= ucByteBuf[usByteOffset + 1] << BITS_UCHAR;
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/* Zero out bit field bits and then or value bits into them. */
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usWordBuf = ( USHORT )( ( usWordBuf & ( ~usMask ) ) | usValue );
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/* move bits back into storage */
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ucByteBuf[usByteOffset] = ( UCHAR )( usWordBuf & 0xFF );
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ucByteBuf[usByteOffset + 1] = ( UCHAR )( usWordBuf >> BITS_UCHAR );
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}
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UCHAR
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xMBUtilGetBits( UCHAR * ucByteBuf, USHORT usBitOffset, UCHAR ucNBits )
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{
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USHORT usWordBuf;
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USHORT usMask;
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USHORT usByteOffset;
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USHORT usNPreBits;
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/* Calculate byte offset for first byte containing the bit values starting
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* at usBitOffset. */
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usByteOffset = ( USHORT )( ( usBitOffset ) / BITS_UCHAR );
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/* How many bits precede our bits to set. */
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usNPreBits = ( USHORT )( usBitOffset - usByteOffset * BITS_UCHAR );
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/* Prepare a mask for setting the new bits. */
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usMask = ( USHORT )( ( 1 << ( USHORT ) ucNBits ) - 1 );
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/* copy bits into temporary storage. */
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usWordBuf = ucByteBuf[usByteOffset];
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usWordBuf |= ucByteBuf[usByteOffset + 1] << BITS_UCHAR;
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/* throw away unneeded bits. */
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usWordBuf >>= usNPreBits;
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/* mask away bits above the requested bitfield. */
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usWordBuf &= usMask;
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return ( UCHAR ) usWordBuf;
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}
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eMBException
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prveMBError2Exception( eMBErrorCode eErrorCode )
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{
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eMBException eStatus;
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switch ( eErrorCode )
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{
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case MB_ENOERR:
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eStatus = MB_EX_NONE;
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break;
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case MB_ENOREG:
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eStatus = MB_EX_ILLEGAL_DATA_ADDRESS;
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break;
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case MB_ETIMEDOUT:
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eStatus = MB_EX_SLAVE_BUSY;
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break;
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default:
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eStatus = MB_EX_SLAVE_DEVICE_FAILURE;
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break;
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}
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return eStatus;
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}
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