Modbus ASCII Client

Author: mostafahk

src/ArduinoModbus.h

@@ -20,6 +20,8 @@
 #ifndef _ARDUINO_MODBUS_H_INCLUDED
 #define _ARDUINO_MODBUS_H_INCLUDED
 
+#include "ModbusASCIIClient.h"
+
 #include "ModbusRTUClient.h"
 #include "ModbusRTUServer.h"
 

src/ModbusASCIIClient.cpp

@@ -0,0 +1,60 @@
+/*
+  This file is part of the ArduinoModbus library.
+  Copyright (c) 2018 Arduino SA. All rights reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include <errno.h>
+
+extern "C" {
+#include "libmodbus/modbus.h"
+#include "libmodbus/modbus-ascii.h"
+}
+
+#include "ModbusASCIIClient.h"
+
+ModbusASCIIClientClass::ModbusASCIIClientClass() :
+  ModbusClient(1000)
+{
+}
+
+ModbusASCIIClientClass::ModbusASCIIClientClass(RS485Class& rs485) :
+  ModbusClient(1000),  _rs485(&rs485)
+{
+}
+
+ModbusASCIIClientClass::~ModbusASCIIClientClass()
+{
+}
+
+int ModbusASCIIClientClass::begin(unsigned long baudrate, RS485_SER_CONF_TYPE config)
+{
+  modbus_t* mb = modbus_new_ascii(_rs485, baudrate, config);
+
+  if (!ModbusClient::begin(mb, 0x00)) {
+    return 0;
+  }
+
+  return 1;
+}
+
+int ModbusASCIIClientClass::begin(RS485Class& rs485, unsigned long baudrate, RS485_SER_CONF_TYPE config)
+{
+  _rs485 = &rs485;
+  return begin(baudrate, config);
+}
+
+ModbusASCIIClientClass ModbusASCIIClient;

src/ModbusASCIIClient.h

@@ -0,0 +1,49 @@
+/*
+  This file is part of the ArduinoModbus library.
+  Copyright (c) 2018 Arduino SA. All rights reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef _MODBUS_ASCII_CLIENT_H_INCLUDED
+#define _MODBUS_ASCII_CLIENT_H_INCLUDED
+
+#include "ModbusClient.h"
+#include <ArduinoRS485.h>
+
+class ModbusASCIIClientClass : public ModbusClient {
+public:
+  ModbusASCIIClientClass();
+  ModbusASCIIClientClass(RS485Class& rs485);
+  virtual ~ModbusASCIIClientClass();
+
+  /**
+   * Start the Modbus RTU client with the specified parameters
+   *
+   * @param baudrate Baud rate to use
+   * @param config serial config. to use defaults to SERIAL_8N1
+   *
+   * Return 1 on success, 0 on failure
+   */
+  int begin(unsigned long baudrate, RS485_SER_CONF_TYPE config = SERIAL_8N1);
+  int begin(RS485Class& rs485, unsigned long baudrate, RS485_SER_CONF_TYPE config = SERIAL_8N1);
+
+private:
+  RS485Class* _rs485 = &RS485;
+};
+
+extern ModbusASCIIClientClass ModbusASCIIClient;
+
+#endif

src/libmodbus/modbus-ascii-private.h

@@ -0,0 +1,85 @@
+/*
+ * Copyright © 2001-2011 Stéphane Raimbault <stephane.raimbault@gmail.com>
+ * Copyright © 2018 Arduino SA. All rights reserved.
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+#ifndef MODBUS_ASCII_PRIVATE_H
+#define MODBUS_ASCII_PRIVATE_H
+
+#ifndef _MSC_VER
+#include <stdint.h>
+#else
+#include "stdint.h"
+#endif
+
+#if defined(_WIN32)
+#include <windows.h>
+#elif defined(ARDUINO)
+#include <ArduinoRS485.h>
+#else
+#include <termios.h>
+#endif
+
+#define _MODBUS_ASCII_HEADER_LENGTH      1
+#define _MODBUS_ASCII_PRESET_REQ_LENGTH  6
+#define _MODBUS_ASCII_PRESET_RSP_LENGTH  2
+
+#define _MODBUS_ASCII_CHECKSUM_LENGTH    1
+
+#if defined(_WIN32)
+#if !defined(ENOTSUP)
+#define ENOTSUP WSAEOPNOTSUPP
+#endif
+
+/* WIN32: struct containing serial handle and a receive buffer */
+#define PY_BUF_SIZE 512
+struct win32_ser {
+    /* File handle */
+    HANDLE fd;
+    /* Receive buffer */
+    uint8_t buf[PY_BUF_SIZE];
+    /* Received chars */
+    DWORD n_bytes;
+};
+#endif /* _WIN32 */
+
+typedef struct _modbus_ascii {
+#if defined(ARDUINO)
+    unsigned long baud;
+    RS485_SER_CONF_TYPE config;
+    RS485Class* rs485;
+#else
+    /* Device: "/dev/ttyS0", "/dev/ttyUSB0" or "/dev/tty.USA19*" on Mac OS X. */
+    char *device;
+    /* Bauds: 9600, 19200, 57600, 115200, etc */
+    int baud;
+    /* Data bit */
+    uint8_t data_bit;
+    /* Stop bit */
+    uint8_t stop_bit;
+    /* Parity: 'N', 'O', 'E' */
+    char parity;
+#if defined(_WIN32)
+    struct win32_ser w_ser;
+    DCB old_dcb;
+#else
+    /* Save old termios settings */
+    struct termios old_tios;
+#endif
+#if HAVE_DECL_TIOCSRS485
+    int serial_mode;
+#endif
+#if HAVE_DECL_TIOCM_RTS
+    int rts;
+    int rts_delay;
+    int onebyte_time;
+    void (*set_rts) (modbus_t *ctx, int on);
+#endif
+#endif
+    /* To handle many slaves on the same link */
+    int confirmation_to_ignore;
+} modbus_ascii_t;
+
+#endif /* MODBUS_ASCII_PRIVATE_H */