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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>
83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
/****************************************************************************
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* apps/industry/nxmodbus/core/nxmb_func_diag.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 <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_DIAG_SUBFUNC_OFF 0
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#define NXMB_DIAG_DATA_OFF 2
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#define NXMB_DIAG_REQ_MIN_DATA_LEN 4
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/* Sub-function codes */
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#define NXMB_DIAG_RETURN_QUERY 0x0000
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxmb_fc08_diagnostics
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****************************************************************************/
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enum nxmb_exception_e nxmb_fc08_diagnostics(nxmb_handle_t ctx)
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{
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uint16_t data_len = ctx->adu.length - 2;
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uint16_t subfunc;
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if (data_len < NXMB_DIAG_REQ_MIN_DATA_LEN)
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{
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return NXMB_EX_ILLEGAL_DATA_VALUE;
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}
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subfunc = nxmb_util_get_u16_be(&ctx->adu.data[NXMB_DIAG_SUBFUNC_OFF]);
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switch (subfunc)
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{
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case NXMB_DIAG_RETURN_QUERY:
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{
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/* Response echoes the request — adu is already correct */
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return NXMB_EX_NONE;
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}
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default:
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{
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return NXMB_EX_ILLEGAL_FUNCTION;
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}
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}
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}
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