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modbus_rtu.h
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modbus_rtu.h
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/*
modbus_rtu.h - a lightweight ModBus RTU implementation
Part of grblHAL
Copyright (c) 2020-2023 Terje Io
Grbl is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Grbl is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Grbl. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _MODBUS_RTU_H_
#define _MODBUS_RTU_H_
#ifdef ARDUINO
#include "../grbl/modbus.h"
#else
#include "grbl/modbus.h"
#endif
typedef enum {
ModBus_Idle,
ModBus_Silent,
ModBus_TX,
ModBus_AwaitReply,
ModBus_Timeout,
ModBus_GotReply,
ModBus_Exception
} modbus_state_t;
typedef void (*stream_set_direction_ptr)(bool tx);
typedef struct {
set_baud_rate_ptr set_baud_rate;
stream_set_direction_ptr set_direction; // NULL if auto direction
get_stream_buffer_count_ptr get_tx_buffer_count;
get_stream_buffer_count_ptr get_rx_buffer_count;
stream_write_n_ptr write;
stream_read_ptr read;
flush_stream_buffer_ptr flush_tx_buffer;
flush_stream_buffer_ptr flush_rx_buffer;
} modbus_stream_t;
void modbus_rtu_init (void);
bool modbus_rtu_send (modbus_message_t *msg, const modbus_callbacks_t *callbacks, bool block);
#endif