forked from espressif/esp-modbus
129 lines
4.5 KiB
C
129 lines
4.5 KiB
C
/*
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* FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
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* Copyright (c) 2016, 2017 Nucleron R&D LLC <main@nucleron.ru>
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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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#include <mb_common.h>
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#include <mb_proto.h>
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/* ----------------------- Defines ------------------------------------------*/
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#define BITS_uint8_t 8U
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/* ----------------------- Start implementation -----------------------------*/
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void mb_util_set_bits(uint8_t *byte_buf, uint16_t bit_offset, uint8_t but_num, uint8_t value)
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{
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uint16_t word_buf;
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uint16_t msk;
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uint16_t byte_offset;
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uint16_t pre_bits_num;
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uint16_t us_val = value;
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assert(but_num <= 8);
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assert((size_t)BITS_uint8_t == sizeof(uint8_t) * 8);
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/* Calculate byte offset for first byte containing the bit values starting
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* at bit_offset. */
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byte_offset = (uint16_t)((bit_offset) / BITS_uint8_t);
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/* How many bits precede our bits to set. */
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pre_bits_num = (uint16_t)(bit_offset - byte_offset * BITS_uint8_t);
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/* Move bit field into position over bits to set */
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us_val <<= pre_bits_num;
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/* Prepare a mask for setting the new bits. */
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msk = (uint16_t)((1 << (uint16_t) but_num) - 1);
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msk <<= bit_offset - byte_offset * BITS_uint8_t;
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/* copy bits into temporary storage. */
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word_buf = byte_buf[byte_offset];
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word_buf |= byte_buf[byte_offset + 1] << BITS_uint8_t;
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/* Zero out bit field bits and then or value bits into them. */
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word_buf = (uint16_t)((word_buf & (~msk)) | us_val);
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/* move bits back into storage */
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byte_buf[byte_offset] = (uint8_t)(word_buf & 0xFF);
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byte_buf[byte_offset + 1] = (uint8_t)(word_buf >> BITS_uint8_t);
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}
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uint8_t mb_util_get_bits(uint8_t *byte_buf, uint16_t bit_offset, uint8_t but_num)
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{
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uint16_t word_buf;
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uint16_t msk;
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uint16_t byte_offset;
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uint16_t pre_bits_num;
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/* Calculate byte offset for first byte containing the bit values starting
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* at bit_offset. */
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byte_offset = (uint16_t)((bit_offset) / BITS_uint8_t);
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/* How many bits precede our bits to set. */
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pre_bits_num = (uint16_t)(bit_offset - byte_offset * BITS_uint8_t);
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/* Prepare a mask for setting the new bits. */
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msk = (uint16_t)((1 << (uint16_t) but_num) - 1);
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/* copy bits into temporary storage. */
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word_buf = byte_buf[byte_offset];
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word_buf |= byte_buf[byte_offset + 1] << BITS_uint8_t;
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/* throw away unneeded bits. */
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word_buf >>= pre_bits_num;
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/* mask away bits above the requested bitfield. */
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word_buf &= msk;
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return (uint8_t) word_buf;
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}
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mb_exception_t mb_error_to_exception(mb_err_enum_t error_code)
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{
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mb_exception_t status;
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switch (error_code) {
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case MB_ENOERR:
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status = MB_EX_NONE;
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break;
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case MB_ENOREG:
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status = MB_EX_ILLEGAL_DATA_ADDRESS;
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break;
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case MB_ETIMEDOUT:
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status = MB_EX_SLAVE_BUSY;
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break;
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default:
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status = MB_EX_SLAVE_DEVICE_FAILURE;
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break;
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}
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return status;
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}
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