78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
/*
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* Copyright © Stéphane Raimbault <stephane.raimbault@gmail.com>
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#ifndef MODBUS_RTU_PRIVATE_H
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#define MODBUS_RTU_PRIVATE_H
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#ifndef _MSC_VER
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#include <stdint.h>
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#else
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#include "stdint.h"
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#endif
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#if defined(_WIN32)
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#include <windows.h>
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#else
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#include <termios.h>
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#endif
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#define _MODBUS_RTU_HEADER_LENGTH 1
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#define _MODBUS_RTU_PRESET_REQ_LENGTH 6
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#define _MODBUS_RTU_PRESET_RSP_LENGTH 2
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#define _MODBUS_RTU_CHECKSUM_LENGTH 2
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#if defined(_WIN32)
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#if !defined(ENOTSUP)
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#define ENOTSUP WSAEOPNOTSUPP
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#endif
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/* WIN32: struct containing serial handle and a receive buffer */
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#define PY_BUF_SIZE 512
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struct win32_ser {
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/* File handle */
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HANDLE fd;
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/* Receive buffer */
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uint8_t buf[PY_BUF_SIZE];
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/* Received chars */
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DWORD n_bytes;
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};
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#endif /* _WIN32 */
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typedef struct _modbus_rtu {
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/* Device: "/dev/ttyS0", "/dev/ttyUSB0" or "/dev/tty.USA19*" on Mac OS X. */
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char *device;
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/* Bauds: 9600, 19200, 57600, 115200, etc */
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int baud;
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/* Data bit */
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uint8_t data_bit;
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/* Stop bit */
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uint8_t stop_bit;
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/* Parity: 'N', 'O', 'E' */
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char parity;
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#if defined(_WIN32)
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struct win32_ser w_ser;
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DCB old_dcb;
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#else
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/* Save old termios settings */
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struct termios old_tios;
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#endif
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#if HAVE_DECL_TIOCSRS485
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int serial_mode;
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#endif
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#if HAVE_DECL_TIOCM_RTS
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int rts;
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int rts_delay;
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int onebyte_time;
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void (*set_rts)(modbus_t *ctx, int on);
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#endif
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/* To handle many slaves on the same link */
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int confirmation_to_ignore;
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} modbus_rtu_t;
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#endif /* MODBUS_RTU_PRIVATE_H */
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