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773f69d5d9
NxModbus is a lightweight Modbus protocol stack implementation for NuttX RTOS. This commit adds: - nxmodbus stack - nxmbserver - Modbus Server (Slave) example - nxmbclient - Modbus Client (Master) tool Supported Modbus transports: - ASCII - RTU over serial port - TCP - RAW (ADU) for custom transport implementations Signed-off-by: raiden00pl <raiden00@railab.me>
99 lines
3.2 KiB
C
99 lines
3.2 KiB
C
/****************************************************************************
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* apps/industry/nxmodbus/core/nxmb_func_other.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/compiler.h>
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#include <stdint.h>
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#include <string.h>
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#include <nxmodbus/nxmodbus.h>
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#include "nxmb_internal.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define NXMB_REPORT_ID_REQ_DATA_LEN 0
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/* Run indicator status */
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#define NXMB_RUN_STATUS_ON 0xff
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#define NXMB_RUN_STATUS_OFF 0x00
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxmb_fc17_report_server_id
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*
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* Description:
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* Handle FC17 (0x11) Report Server ID request. Returns the configured
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* unit ID and a run indicator byte (0xFF = ON).
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*
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****************************************************************************/
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enum nxmb_exception_e nxmb_fc17_report_server_id(nxmb_handle_t ctx)
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{
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uint16_t data_len = ctx->adu.length - 2;
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if (data_len != NXMB_REPORT_ID_REQ_DATA_LEN)
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{
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return NXMB_EX_ILLEGAL_DATA_VALUE;
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}
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/* If the application configured server ID data via nxmb_set_server_id(),
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* use that; otherwise fall back to unit_id + run status ON.
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*/
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ctx->adu.fc = NXMB_FC_REPORT_SERVER_ID;
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if (ctx->server_id_len > 0)
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{
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/* Response is byte_count + server_id_buf */
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if (1 + ctx->server_id_len > NXMB_ADU_DATA_MAX)
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{
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return NXMB_EX_DEVICE_FAILURE;
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}
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ctx->adu.data[0] = (uint8_t)ctx->server_id_len;
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memcpy(&ctx->adu.data[1], ctx->server_id_buf, ctx->server_id_len);
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ctx->adu.length = (uint16_t)(2 + 1 + ctx->server_id_len);
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}
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else
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{
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ctx->adu.data[0] = 2; /* byte count */
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ctx->adu.data[1] = ctx->unit_id; /* server ID */
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ctx->adu.data[2] = NXMB_RUN_STATUS_ON; /* run indicator */
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ctx->adu.length = (uint16_t)(2 + 3);
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}
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return NXMB_EX_NONE;
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}
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