src/modbus-rtu-private.h

   1 /*
   2  * Copyright © Stéphane Raimbault <stephane.raimbault@gmail.com>
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-or-later
   5  */
   6
   7 #ifndef MODBUS_RTU_PRIVATE_H
   8 #define MODBUS_RTU_PRIVATE_H
   9
  10 #ifndef _MSC_VER
  11 #include <stdint.h>
  12 #else
  13 #include "stdint.h"
  14 #endif
  15
  16 #if defined(_WIN32)
  17 #include <windows.h>
  18 #else
  19 #include <termios.h>
  20 #endif
  21
  22 #define _MODBUS_RTU_HEADER_LENGTH     1
  23 #define _MODBUS_RTU_PRESET_REQ_LENGTH 6
  24 #define _MODBUS_RTU_PRESET_RSP_LENGTH 2
  25
  26 #define _MODBUS_RTU_CHECKSUM_LENGTH 2
  27
  28 #if defined(_WIN32)
  29 #if !defined(ENOTSUP)
  30 #define ENOTSUP WSAEOPNOTSUPP
  31 #endif
  32
  33 /* WIN32: struct containing serial handle and a receive buffer */
  34 #define PY_BUF_SIZE 512
  35
  36 struct win32_ser {
  37     /* File handle */
  38     HANDLE fd;
  39     /* Receive buffer */
  40     uint8_t buf[PY_BUF_SIZE];
  41     /* Received chars */
  42     DWORD n_bytes;
  43 };
  44 #endif /* _WIN32 */
  45
  46 typedef struct _modbus_rtu {
  47     /* Device: "/dev/ttyS0", "/dev/ttyUSB0" or "/dev/tty.USA19*" on Mac OS X. */
  48     char *device;
  49     /* Bauds: 9600, 19200, 57600, 115200, etc */
  50     int baud;
  51     /* Data bit */
  52     uint8_t data_bit;
  53     /* Stop bit */
  54     uint8_t stop_bit;
  55     /* Parity: 'N', 'O', 'E' */
  56     char parity;
  57 #if defined(_WIN32)
  58     struct win32_ser w_ser;
  59     DCB old_dcb;
  60 #else
  61     /* Save old termios settings */
  62     struct termios old_tios;
  63 #endif
  64 #if HAVE_DECL_TIOCSRS485
  65     int serial_mode;
  66 #endif
  67 #if HAVE_DECL_TIOCM_RTS
  68     int rts;
  69     int rts_delay;
  70     int onebyte_time;
  71     void (*set_rts)(modbus_t *ctx, int on);
  72 #endif
  73     /* To handle many slaves on the same link */
  74     int confirmation_to_ignore;
  75 } modbus_rtu_t;
  76
  77 #endif /* MODBUS_RTU_PRIVATE_H */