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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>
110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
/****************************************************************************
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* apps/industry/nxmodbus/core/nxmb_func_discrete.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_FC02_ADDR_OFF 0
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#define NXMB_FC02_QTY_OFF 2
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#define NXMB_FC02_REQ_DATA_LEN 4
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#define NXMB_DISCRETE_QTY_MAX 2000
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxmb_fc02_read_discrete
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****************************************************************************/
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enum nxmb_exception_e nxmb_fc02_read_discrete(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 addr;
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uint16_t qty;
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uint8_t nbytes;
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int ret;
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if (data_len != NXMB_FC02_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 (ctx->callbacks == NULL || ctx->callbacks->discrete_cb == NULL)
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{
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return NXMB_EX_ILLEGAL_FUNCTION;
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}
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addr = nxmb_util_get_u16_be(&ctx->adu.data[NXMB_FC02_ADDR_OFF]);
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qty = nxmb_util_get_u16_be(&ctx->adu.data[NXMB_FC02_QTY_OFF]);
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if (qty < 1 || qty > NXMB_DISCRETE_QTY_MAX)
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{
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return NXMB_EX_ILLEGAL_DATA_VALUE;
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}
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if ((uint32_t)addr + qty > 0xffffu)
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{
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return NXMB_EX_ILLEGAL_DATA_ADDRESS;
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}
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nbytes = (uint8_t)((qty + 7) / 8);
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/* Response is byte_count + discrete data */
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if (1 + nbytes > NXMB_ADU_DATA_MAX)
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{
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return NXMB_EX_ILLEGAL_DATA_VALUE;
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}
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ctx->adu.fc = NXMB_FC_READ_DISCRETE;
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ctx->adu.data[0] = nbytes;
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memset(&ctx->adu.data[1], 0, nbytes);
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ret = ctx->callbacks->discrete_cb(&ctx->adu.data[1], addr, qty,
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ctx->callbacks->priv);
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if (ret != 0)
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{
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return nxmb_cb_ret_to_exception(ret);
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}
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ctx->adu.length = (uint16_t)(2 + 1 + nbytes);
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return NXMB_EX_NONE;
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}
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