forked from espressif/esp-modbus
271 lines
11 KiB
C
271 lines
11 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: mbfuncholding.c, v 1.12 2007/02/18 23:48:22 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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#include "mb_slave.h"
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/* ----------------------- Defines ------------------------------------------*/
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#define MB_PDU_FUNC_READ_ADDR_OFF (MB_PDU_DATA_OFF + 0)
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#define MB_PDU_FUNC_READ_REGCNT_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_REGCNT_MAX (0x007D)
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#define MB_PDU_FUNC_WRITE_ADDR_OFF (MB_PDU_DATA_OFF + 0)
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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 + 0)
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#define MB_PDU_FUNC_WRITE_MUL_REGCNT_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_REGCNT_MAX (0x0078)
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#define MB_PDU_FUNC_READWRITE_READ_ADDR_OFF (MB_PDU_DATA_OFF + 0)
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#define MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF (MB_PDU_DATA_OFF + 2)
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#define MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF (MB_PDU_DATA_OFF + 4)
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#define MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF (MB_PDU_DATA_OFF + 6)
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#define MB_PDU_FUNC_READWRITE_BYTECNT_OFF (MB_PDU_DATA_OFF + 8)
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#define MB_PDU_FUNC_READWRITE_WRITE_VALUES_OFF (MB_PDU_DATA_OFF + 9)
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#define MB_PDU_FUNC_READWRITE_SIZE_MIN (9)
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/* ----------------------- Static functions ---------------------------------*/
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mb_exception_t mb_error_to_exception(mb_err_enum_t error_code);
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/* ----------------------- Start implementation -----------------------------*/
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#if MB_FUNC_WRITE_HOLDING_ENABLED > 0
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mb_exception_t mbs_fn_write_holding_reg(mb_base_t *inst, uint8_t *frame_ptr, uint16_t *len_buf)
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{
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uint16_t reg_addr;
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mb_exception_t status = MB_EX_NONE;
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mb_err_enum_t reg_status = MB_EILLFUNC;
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if (*len_buf == (MB_PDU_FUNC_WRITE_SIZE + MB_PDU_SIZE_MIN)) {
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reg_addr = (uint16_t)(frame_ptr[MB_PDU_FUNC_WRITE_ADDR_OFF] << 8);
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reg_addr |= (uint16_t)(frame_ptr[MB_PDU_FUNC_WRITE_ADDR_OFF + 1]);
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reg_addr++;
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/* Make callback to update the value. */
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if (inst->rw_cbs.reg_holding_cb) {
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reg_status = inst->rw_cbs.reg_holding_cb(inst, &frame_ptr[MB_PDU_FUNC_WRITE_VALUE_OFF], reg_addr, 1, MB_REG_WRITE);
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}
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/* If an error occured convert it into a Modbus exception. */
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if (reg_status != MB_ENOERR) {
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status = mb_error_to_exception(reg_status);
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}
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} else {
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/* Can't be a valid request because the length is incorrect. */
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status = MB_EX_ILLEGAL_DATA_VALUE;
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}
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return status;
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}
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#endif
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#if MB_FUNC_WRITE_MULTIPLE_HOLDING_ENABLED > 0
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mb_exception_t mbs_fn_write_multi_holding_reg(mb_base_t *inst, uint8_t *frame_ptr, uint16_t *len_buf)
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{
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uint16_t reg_addr;
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uint16_t reg_cnt;
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uint8_t reg_byte_cnt;
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mb_exception_t status = MB_EX_NONE;
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mb_err_enum_t reg_status = MB_EILLFUNC;
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if (*len_buf >= (MB_PDU_FUNC_WRITE_MUL_SIZE_MIN + MB_PDU_SIZE_MIN)) {
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reg_addr = (uint16_t)(frame_ptr[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF] << 8);
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reg_addr |= (uint16_t)(frame_ptr[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF + 1]);
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reg_addr++;
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reg_cnt = (uint16_t)(frame_ptr[MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF] << 8);
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reg_cnt |= (uint16_t)(frame_ptr[MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF + 1]);
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reg_byte_cnt = frame_ptr[MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF];
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if ((reg_cnt >= 1) &&
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(reg_cnt <= MB_PDU_FUNC_WRITE_MUL_REGCNT_MAX) &&
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(reg_byte_cnt == (uint8_t) (2 * reg_cnt))) {
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/* Make callback to update the register values. */
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if (inst->rw_cbs.reg_holding_cb) {
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reg_status = inst->rw_cbs.reg_holding_cb(inst, &frame_ptr[MB_PDU_FUNC_WRITE_MUL_VALUES_OFF], reg_addr, reg_cnt, MB_REG_WRITE);
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}
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/* If an error occured convert it into a Modbus exception. */
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if (reg_status != MB_ENOERR) {
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status = mb_error_to_exception(reg_status);
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} else {
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/* The response contains the function code, the starting
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* address and the quantity of registers. We reuse the
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* old values in the buffer because they are still valid.
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*/
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*len_buf = MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF;
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}
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} else {
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status = MB_EX_ILLEGAL_DATA_VALUE;
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}
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} else {
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/* Can't be a valid request because the length is incorrect. */
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status = MB_EX_ILLEGAL_DATA_VALUE;
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}
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return status;
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}
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#endif
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#if MB_FUNC_READ_HOLDING_ENABLED > 0
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mb_exception_t mbs_fn_read_holding_reg(mb_base_t *inst, uint8_t *frame_ptr, uint16_t *len_buf)
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{
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uint16_t reg_addr;
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uint16_t reg_cnt;
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uint8_t *frame_cur;
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mb_exception_t status = MB_EX_NONE;
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mb_err_enum_t reg_status = MB_EILLFUNC;
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if (*len_buf == (MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN)) {
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reg_addr = (uint16_t)(frame_ptr[MB_PDU_FUNC_READ_ADDR_OFF] << 8);
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reg_addr |= (uint16_t)(frame_ptr[MB_PDU_FUNC_READ_ADDR_OFF + 1]);
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reg_addr++;
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reg_cnt = (uint16_t)(frame_ptr[MB_PDU_FUNC_READ_REGCNT_OFF] << 8);
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reg_cnt = (uint16_t)(frame_ptr[MB_PDU_FUNC_READ_REGCNT_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 ((reg_cnt >= 1) && (reg_cnt <= MB_PDU_FUNC_READ_REGCNT_MAX)) {
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/* Set the current PDU data pointer to the beginning. */
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frame_cur = &frame_ptr[MB_PDU_FUNC_OFF];
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*len_buf = MB_PDU_FUNC_OFF;
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/* First byte contains the function code. */
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*frame_cur++ = MB_FUNC_READ_HOLDING_REGISTER;
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*len_buf += 1;
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/* Second byte in the response contain the number of bytes. */
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*frame_cur++ = (uint8_t) (reg_cnt * 2);
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*len_buf += 1;
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/* Make callback to fill the buffer. */
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if (inst->rw_cbs.reg_holding_cb) {
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reg_status = inst->rw_cbs.reg_holding_cb(inst, frame_cur, reg_addr, reg_cnt, MB_REG_READ);
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}
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/* If an error occured convert it into a Modbus exception. */
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if (reg_status != MB_ENOERR) {
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status = mb_error_to_exception(reg_status);
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} else {
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*len_buf += reg_cnt * 2;
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}
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} else {
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status = MB_EX_ILLEGAL_DATA_VALUE;
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}
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} else {
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/* Can't be a valid request because the length is incorrect. */
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status = MB_EX_ILLEGAL_DATA_VALUE;
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}
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return status;
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}
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#endif
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#if MB_FUNC_READWRITE_HOLDING_ENABLED > 0
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mb_exception_t mbs_fn_rw_multi_holding_reg(mb_base_t *inst, uint8_t *frame_ptr, uint16_t *len_buf)
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{
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uint16_t reg_rd_addr;
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uint16_t reg_rd_cnt;
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uint16_t reg_wr_addr;
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uint16_t reg_wr_cnt;
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uint8_t reg_wr_byte_cnt;
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uint8_t *frame_cur;
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mb_exception_t status = MB_EX_NONE;
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mb_err_enum_t reg_status = MB_EILLFUNC;
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(void)inst;
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if (*len_buf >= (MB_PDU_FUNC_READWRITE_SIZE_MIN + MB_PDU_SIZE_MIN)) {
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reg_rd_addr = (uint16_t)(frame_ptr[MB_PDU_FUNC_READWRITE_READ_ADDR_OFF] << 8U);
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reg_rd_addr |= (uint16_t)(frame_ptr[MB_PDU_FUNC_READWRITE_READ_ADDR_OFF + 1]);
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reg_rd_addr++;
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reg_rd_cnt = (uint16_t)(frame_ptr[MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF] << 8U);
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reg_rd_cnt |= (uint16_t)(frame_ptr[MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF + 1]);
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reg_wr_addr = (uint16_t)(frame_ptr[MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF] << 8U);
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reg_wr_addr |= (uint16_t)(frame_ptr[MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF + 1]);
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reg_wr_addr++; // increase by one
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reg_wr_cnt = (uint16_t)(frame_ptr[MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF] << 8U);
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reg_wr_cnt |= (uint16_t)(frame_ptr[MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF + 1]);
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reg_wr_byte_cnt = frame_ptr[MB_PDU_FUNC_READWRITE_BYTECNT_OFF];
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if ((reg_rd_cnt >= 1) && (reg_rd_cnt <= MB_PDU_FUNC_READ_REGCNT_MAX) &&
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(reg_wr_cnt >= 1) && (reg_wr_cnt <= MB_PDU_FUNC_WRITE_MUL_REGCNT_MAX) &&
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((2 * reg_wr_cnt) == reg_wr_byte_cnt)) {
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/* Make callback to update the register values. */
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if (inst->rw_cbs.reg_holding_cb) {
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reg_status = inst->rw_cbs.reg_holding_cb(inst, &frame_ptr[MB_PDU_FUNC_READWRITE_WRITE_VALUES_OFF], reg_wr_addr, reg_wr_cnt, MB_REG_WRITE);
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}
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if (reg_status == MB_ENOERR) {
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/* Set the current PDU data pointer to the beginning. */
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frame_cur = &frame_ptr[MB_PDU_FUNC_OFF];
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*len_buf = MB_PDU_FUNC_OFF;
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/* First byte contains the function code. */
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*frame_cur++ = MB_FUNC_READWRITE_MULTIPLE_REGISTERS;
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*len_buf += 1;
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/* Second byte in the response contain the number of bytes. */
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*frame_cur++ = (uint8_t) (reg_rd_cnt * 2);
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*len_buf += 1;
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/* Make the read callback. */
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if (inst->rw_cbs.reg_holding_cb) {
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reg_status = inst->rw_cbs.reg_holding_cb(inst, frame_cur, reg_rd_addr, reg_rd_cnt, MB_REG_READ);
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}
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if (reg_status == MB_ENOERR) {
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*len_buf += 2 * reg_rd_cnt;
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}
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}
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if (reg_status != MB_ENOERR) {
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status = mb_error_to_exception(reg_status);
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}
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} else {
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status = MB_EX_ILLEGAL_DATA_VALUE;
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}
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}
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return status;
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}
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#endif
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