111 lines
4.2 KiB
C
111 lines
4.2 KiB
C
/****************************************************************************
|
|
* apps/include/modbus/mbutils.h
|
|
*
|
|
* FreeModbus Library: 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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef __APPS_INCLUDE_MODBUS_MBUTILS_H
|
|
#define __APPS_INCLUDE_MODBUS_MBUTILS_H
|
|
|
|
#ifdef __cplusplus
|
|
PR_BEGIN_EXTERN_C
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
/* 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.
|
|
*
|
|
* Input Parameters:
|
|
* 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.
|
|
* usBitOffset The starting address of the bits to set. The first
|
|
* bit has the offset 0.
|
|
* ucNBits Number of bits to modify. The value must always be smaller
|
|
* than 8.
|
|
* ucValues Thew new values for the bits. The value for the first bit
|
|
* starting at usBitOffset is the LSB of the value ucValues
|
|
*
|
|
* 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);
|
|
*/
|
|
|
|
void xMBUtilSetBits(uint8_t *ucByteBuf, uint16_t usBitOffset,
|
|
uint8_t ucNBits, uint8_t ucValues);
|
|
|
|
/* 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.
|
|
*
|
|
* Input Parameters:
|
|
* ucByteBuf A buffer where the bit values are stored.
|
|
* usBitOffset The starting address of the bits to set. The first
|
|
* bit has the offset 0.
|
|
* ucNBits Number of bits to modify. The value must always be smaller
|
|
* than 8.
|
|
*
|
|
* uint8_t ucBits[2] = {0, 0};
|
|
* uint8_t ucResult;
|
|
*
|
|
* // Extract the bits 3 - 10.
|
|
*
|
|
* ucResult = xMBUtilGetBits(ucBits, 3, 8);
|
|
*/
|
|
|
|
uint8_t xMBUtilGetBits(uint8_t *ucByteBuf, uint16_t usBitOffset, uint8_t ucNBits);
|
|
|
|
#ifdef __cplusplus
|
|
PR_END_EXTERN_C
|
|
#endif
|
|
|
|
#endif /* __APPS_INCLUDE_MODBUS_MBUTILS_H */
|