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
109 lines
4 KiB
C
109 lines
4 KiB
C
/*
|
|
* 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: mbutils.h,v 1.5 2006/12/07 22:10:34 wolti Exp $
|
|
*/
|
|
|
|
#ifndef _MB_UTILS_H
|
|
#define _MB_UTILS_H
|
|
|
|
#ifdef __cplusplus
|
|
PR_BEGIN_EXTERN_C
|
|
#endif
|
|
/*! \defgroup modbus_utils Utilities
|
|
*
|
|
* This module contains some utility functions which can be used by
|
|
* the application. It includes some special functions for working with
|
|
* bitfields backed by a character array buffer.
|
|
*
|
|
*/
|
|
/*! \addtogroup modbus_utils
|
|
* @{
|
|
*/
|
|
/*! \brief Function to set bits in a byte buffer.
|
|
*
|
|
* This function allows the efficient use of an array to implement bitfields.
|
|
* The array used for storing the bits must always be a multiple of two
|
|
* bytes. Up to eight bits can be set or cleared in one operation.
|
|
*
|
|
* \param ucByteBuf A buffer where the bit values are stored. Must be a
|
|
* multiple of 2 bytes. No length checking is performed and if
|
|
* usBitOffset / 8 is greater than the size of the buffer memory contents
|
|
* is overwritten.
|
|
* \param usBitOffset The starting address of the bits to set. The first
|
|
* bit has the offset 0.
|
|
* \param ucNBits Number of bits to modify. The value must always be smaller
|
|
* than 8.
|
|
* \param ucValues Thew new values for the bits. The value for the first bit
|
|
* starting at <code>usBitOffset</code> is the LSB of the value
|
|
* <code>ucValues</code>
|
|
*
|
|
* \code
|
|
* ucBits[2] = {0, 0};
|
|
*
|
|
* // Set bit 4 to 1 (read: set 1 bit starting at bit offset 4 to value 1)
|
|
* xMBUtilSetBits( ucBits, 4, 1, 1 );
|
|
*
|
|
* // Set bit 7 to 1 and bit 8 to 0.
|
|
* xMBUtilSetBits( ucBits, 7, 2, 0x01 );
|
|
*
|
|
* // Set bits 8 - 11 to 0x05 and bits 12 - 15 to 0x0A;
|
|
* xMBUtilSetBits( ucBits, 8, 8, 0x5A);
|
|
* \endcode
|
|
*/
|
|
void xMBUtilSetBits( UCHAR * ucByteBuf, USHORT usBitOffset,
|
|
UCHAR ucNBits, UCHAR ucValues );
|
|
|
|
/*! \brief Function to read bits in a byte buffer.
|
|
*
|
|
* This function is used to extract up bit values from an array. Up to eight
|
|
* bit values can be extracted in one step.
|
|
*
|
|
* \param ucByteBuf A buffer where the bit values are stored.
|
|
* \param usBitOffset The starting address of the bits to set. The first
|
|
* bit has the offset 0.
|
|
* \param ucNBits Number of bits to modify. The value must always be smaller
|
|
* than 8.
|
|
*
|
|
* \code
|
|
* UCHAR ucBits[2] = {0, 0};
|
|
* UCHAR ucResult;
|
|
*
|
|
* // Extract the bits 3 - 10.
|
|
* ucResult = xMBUtilGetBits( ucBits, 3, 8 );
|
|
* \endcode
|
|
*/
|
|
UCHAR xMBUtilGetBits( UCHAR * ucByteBuf, USHORT usBitOffset,
|
|
UCHAR ucNBits );
|
|
|
|
/*! @} */
|
|
|
|
#ifdef __cplusplus
|
|
PR_END_EXTERN_C
|
|
#endif
|
|
#endif
|