forked from espressif/esp-modbus
142 lines
6.0 KiB
C
142 lines
6.0 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) 2013 Armink <armink.ztl@gmail.com>
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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: mbfuncdisc_m.c, v 1.60 2013/10/15 8:48:20 Armink Add Master Functions 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 "transport_common.h"
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#include "mb_master.h"
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/* ----------------------- Defines ------------------------------------------*/
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#define MB_PDU_REQ_READ_ADDR_OFF (MB_PDU_DATA_OFF + 0)
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#define MB_PDU_REQ_READ_DISCCNT_OFF (MB_PDU_DATA_OFF + 2)
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#define MB_PDU_REQ_READ_SIZE (4)
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#define MB_PDU_FUNC_READ_DISCCNT_OFF (MB_PDU_DATA_OFF + 0)
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#define MB_PDU_FUNC_READ_VALUES_OFF (MB_PDU_DATA_OFF + 1)
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#define MB_PDU_FUNC_READ_SIZE_MIN (1)
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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_MASTER_RTU_ENABLED || MB_MASTER_ASCII_ENABLED || MB_MASTER_TCP_ENABLED
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#if MB_FUNC_READ_DISCRETE_INPUTS_ENABLED
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/**
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* This function will request read discrete inputs.
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*
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* @param snd_addr salve address
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* @param discrete_addr discrete start address
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* @param discrete_num discrete total number
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* @param timeout timeout (-1 will waiting forever)
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*
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* @return error code
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*/
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mb_err_enum_t mbm_rq_read_discrete_inputs(mb_base_t *inst, uint8_t snd_addr, uint16_t discrete_addr, uint16_t discrete_num, uint32_t tout)
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{
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uint8_t *mb_frame_ptr;
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if (!inst || (snd_addr > MB_ADDRESS_MAX)) {
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return MB_EINVAL;
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}
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if (!mb_port_event_res_take(inst->port_obj, tout)) {
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return MB_EBUSY;
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}
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inst->get_send_buf(inst, &mb_frame_ptr);
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inst->set_dest_addr(inst, snd_addr);
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mb_frame_ptr[MB_PDU_FUNC_OFF] = MB_FUNC_READ_DISCRETE_INPUTS;
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mb_frame_ptr[MB_PDU_REQ_READ_ADDR_OFF] = discrete_addr >> 8;
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mb_frame_ptr[MB_PDU_REQ_READ_ADDR_OFF + 1] = discrete_addr;
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mb_frame_ptr[MB_PDU_REQ_READ_DISCCNT_OFF ] = discrete_num >> 8;
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mb_frame_ptr[MB_PDU_REQ_READ_DISCCNT_OFF + 1] = discrete_num;
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inst->set_send_len(inst, MB_PDU_SIZE_MIN + MB_PDU_REQ_READ_SIZE);
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(void)mb_port_event_post(inst->port_obj, EVENT(EV_FRAME_TRANSMIT | EV_TRANS_START) );
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return mb_port_event_wait_req_finish(inst->port_obj);
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}
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mb_exception_t mbm_fn_read_discrete_inputs(mb_base_t *inst, uint8_t *frame_ptr, uint16_t *len_buf)
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{
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uint8_t byte_num;
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uint8_t *mb_frame_ptr;
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uint16_t discrete_cnt;
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uint16_t reg_address;
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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 (inst->transp_obj->frm_is_bcast(inst->transp_obj)) {
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status = MB_EX_NONE;
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} else if (*len_buf >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READ_SIZE_MIN) {
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inst->get_send_buf(inst, &mb_frame_ptr);
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reg_address = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READ_ADDR_OFF] << 8);
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reg_address |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READ_ADDR_OFF + 1]);
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reg_address++;
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discrete_cnt = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READ_DISCCNT_OFF] << 8);
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discrete_cnt |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READ_DISCCNT_OFF + 1]);
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/* Test if the quantity of coils is a multiple of 8. If not last
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* byte is only partially field with unused coils set to zero. */
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if ((discrete_cnt & 0x0007) != 0) {
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byte_num = (uint8_t)(discrete_cnt / 8 + 1);
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} else {
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byte_num = (uint8_t)(discrete_cnt / 8);
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}
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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 ((discrete_cnt >= 1) && byte_num == frame_ptr[MB_PDU_FUNC_READ_DISCCNT_OFF]) {
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/* Make callback to fill the buffer. */
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if (inst->rw_cbs.reg_discrete_cb) {
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reg_status = inst->rw_cbs.reg_discrete_cb(inst, &frame_ptr[MB_PDU_FUNC_READ_VALUES_OFF],
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reg_address, discrete_cnt);
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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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status = MB_EX_ILLEGAL_DATA_VALUE;
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}
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} else {
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/* Can't be a valid read coil register request because the length
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* 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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#endif // #if MB_SERIAL_MASTER_RTU_ENABLED || MB_SERIAL_MASTER_ASCII_ENABLED || MB_MASTER_TCP_ENABLED
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