67f62a79c1
add support of modbus master ascii rename base dir name of master and slave example to be mb_slave, mb_master to avoid conflict with sdio/slave example test add Kconfig option to enable ASCII and RTU mode separately update ASCII options + remove cast for errors added baudrate for examples into Kconfig updated magic numbers for timer timeout put ascii private definitions into one file
458 lines
20 KiB
C
458 lines
20 KiB
C
/*
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* FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
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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: mb_m.h,v 1.60 2013/09/03 10:20:05 Armink Add Master Functions $
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*/
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#ifndef _MB_M_H
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#define _MB_M_H
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#include "mbconfig.h"
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#include "port.h"
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#ifdef __cplusplus
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PR_BEGIN_EXTERN_C
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#endif
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#include "mbport.h"
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#include "mbproto.h"
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/*! \defgroup modbus Modbus
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* \code #include "mb.h" \endcode
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*
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* This module defines the interface for the application. It contains
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* the basic functions and types required to use the Modbus Master protocol stack.
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* A typical application will want to call eMBMasterInit() first. If the device
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* is ready to answer network requests it must then call eMBEnable() to activate
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* the protocol stack. In the main loop the function eMBMasterPoll() must be called
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* periodically. The time interval between pooling depends on the configured
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* Modbus timeout. If an RTOS is available a separate task should be created
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* and the task should always call the function eMBMasterPoll().
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*
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* \code
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* // Initialize protocol stack in RTU mode for a Master
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* eMBMasterInit( MB_RTU, 38400, MB_PAR_EVEN );
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* // Enable the Modbus Protocol Stack.
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* eMBMasterEnable( );
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* for( ;; )
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* {
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* // Call the main polling loop of the Modbus Master protocol stack.
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* eMBMasterPoll( );
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* ...
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* }
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* \endcode
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*/
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/* ----------------------- Defines ------------------------------------------*/
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/*! \ingroup modbus
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* \brief Use the default Modbus Master TCP port (502)
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*/
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#define MB_MASTER_TCP_PORT_USE_DEFAULT 0
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#ifndef _MB_H
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/* ----------------------- Type definitions ---------------------------------*/
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/*! \ingroup modbus
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* \brief Modbus serial transmission modes (RTU/ASCII).
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*
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* Modbus serial supports two transmission modes. Either ASCII or RTU. RTU
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* is faster but has more hardware requirements and requires a network with
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* a low jitter. ASCII is slower and more reliable on slower links (E.g. modems)
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*/
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typedef enum {
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MB_RTU, /*!< RTU transmission mode. */
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MB_ASCII, /*!< ASCII transmission mode. */
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MB_TCP /*!< TCP mode. */
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} eMBMode;
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/*! \ingroup modbus
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* \brief If register should be written or read.
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*
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* This value is passed to the callback functions which support either
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* reading or writing register values. Writing means that the application
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* registers should be updated and reading means that the modbus protocol
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* stack needs to know the current register values.
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*
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* \see eMBRegHoldingCB( ), eMBRegCoilsCB( ), eMBRegDiscreteCB( ) and
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* eMBRegInputCB( ).
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*/
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typedef enum {
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MB_REG_READ, /*!< Read register values and pass to protocol stack. */
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MB_REG_WRITE /*!< Update register values. */
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} eMBRegisterMode;
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/*! \ingroup modbus
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* \brief Errorcodes used by all function in the protocol stack.
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*/
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typedef enum {
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MB_ENOERR, /*!< no error. */
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MB_ENOREG, /*!< illegal register address. */
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MB_EINVAL, /*!< illegal argument. */
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MB_EPORTERR, /*!< porting layer error. */
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MB_ENORES, /*!< insufficient resources. */
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MB_EIO, /*!< I/O error. */
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MB_EILLSTATE, /*!< protocol stack in illegal state. */
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MB_ETIMEDOUT /*!< timeout error occurred. */
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} eMBErrorCode;
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#endif
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/*! \ingroup modbus
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* \brief Errorcodes used by all function in the Master request.
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*/
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typedef enum
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{
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MB_MRE_NO_ERR, /*!< no error. */
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MB_MRE_NO_REG, /*!< illegal register address. */
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MB_MRE_ILL_ARG, /*!< illegal argument. */
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MB_MRE_REV_DATA, /*!< receive data error. */
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MB_MRE_TIMEDOUT, /*!< timeout error occurred. */
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MB_MRE_MASTER_BUSY, /*!< master is busy now. */
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MB_MRE_EXE_FUN /*!< execute function error. */
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} eMBMasterReqErrCode;
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/*! \ingroup modbus
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* \brief TimerMode is Master 3 kind of Timer modes.
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*/
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typedef enum
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{
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MB_TMODE_T35, /*!< Master receive frame T3.5 timeout. */
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MB_TMODE_RESPOND_TIMEOUT, /*!< Master wait respond for slave. */
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MB_TMODE_CONVERT_DELAY /*!< Master sent broadcast ,then delay sometime.*/
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}eMBMasterTimerMode;
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/* ----------------------- Function prototypes ------------------------------*/
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/*! \ingroup modbus
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* \brief Initialize the Modbus Master protocol stack.
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*
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* This functions initializes the ASCII or RTU module and calls the
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* init functions of the porting layer to prepare the hardware. Please
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* note that the receiver is still disabled and no Modbus frames are
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* processed until eMBMasterEnable( ) has been called.
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*
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* \param eMode If ASCII or RTU mode should be used.
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* \param ucPort The port to use. E.g. 1 for COM1 on windows. This value
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* is platform dependent and some ports simply choose to ignore it.
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* \param ulBaudRate The baudrate. E.g. 19200. Supported baudrates depend
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* on the porting layer.
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* \param eParity Parity used for serial transmission.
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*
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* \return If no error occurs the function returns eMBErrorCode::MB_ENOERR.
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* The protocol is then in the disabled state and ready for activation
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* by calling eMBMasterEnable( ). Otherwise one of the following error codes
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* is returned:
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* - eMBErrorCode::MB_EPORTERR IF the porting layer returned an error.
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*/
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eMBErrorCode eMBMasterInit( eMBMode eMode, UCHAR ucPort,
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ULONG ulBaudRate, eMBParity eParity );
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/*! \ingroup modbus
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* \brief Initialize the Modbus Master protocol stack for Modbus TCP.
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*
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* This function initializes the Modbus TCP Module. Please note that
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* frame processing is still disabled until eMBEnable( ) is called.
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*
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* \param usTCPPort The TCP port to listen on.
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* \return If the protocol stack has been initialized correctly the function
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* returns eMBErrorCode::MB_ENOERR. Otherwise one of the following error
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* codes is returned:
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* - eMBErrorCode::MB_EINVAL If the slave address was not valid. Valid
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* slave addresses are in the range 1 - 247.
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* - eMBErrorCode::MB_EPORTERR IF the porting layer returned an error.
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*/
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eMBErrorCode eMBMasterTCPInit( USHORT usTCPPort );
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/*! \ingroup modbus
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* \brief Release resources used by the protocol stack.
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*
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* This function disables the Modbus Master protocol stack and release all
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* hardware resources. It must only be called when the protocol stack
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* is disabled.
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*
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* \note Note all ports implement this function. A port which wants to
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* get an callback must define the macro MB_PORT_HAS_CLOSE to 1.
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*
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* \return If the resources where released it return eMBErrorCode::MB_ENOERR.
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* If the protocol stack is not in the disabled state it returns
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* eMBErrorCode::MB_EILLSTATE.
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*/
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eMBErrorCode eMBMasterClose( void );
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/*! \ingroup modbus
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* \brief Enable the Modbus Master protocol stack.
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*
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* This function enables processing of Modbus Master frames. Enabling the protocol
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* stack is only possible if it is in the disabled state.
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*
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* \return If the protocol stack is now in the state enabled it returns
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* eMBErrorCode::MB_ENOERR. If it was not in the disabled state it
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* return eMBErrorCode::MB_EILLSTATE.
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*/
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eMBErrorCode eMBMasterEnable( void );
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/*! \ingroup modbus
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* \brief Disable the Modbus Master protocol stack.
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*
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* This function disables processing of Modbus frames.
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*
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* \return If the protocol stack has been disabled it returns
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* eMBErrorCode::MB_ENOERR. If it was not in the enabled state it returns
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* eMBErrorCode::MB_EILLSTATE.
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*/
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eMBErrorCode eMBMasterDisable( void );
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/*! \ingroup modbus
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* \brief The main pooling loop of the Modbus Master protocol stack.
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*
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* This function must be called periodically. The timer interval required
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* is given by the application dependent Modbus slave timeout. Internally the
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* function calls xMBMasterPortEventGet() and waits for an event from the receiver or
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* transmitter state machines.
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*
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* \return If the protocol stack is not in the enabled state the function
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* returns eMBErrorCode::MB_EILLSTATE. Otherwise it returns
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* eMBErrorCode::MB_ENOERR.
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*/
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eMBErrorCode eMBMasterPoll( void );
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/*! \ingroup modbus
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* \brief Registers a callback handler for a given function code.
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*
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* This function registers a new callback handler for a given function code.
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* The callback handler supplied is responsible for interpreting the Modbus PDU and
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* the creation of an appropriate response. In case of an error it should return
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* one of the possible Modbus exceptions which results in a Modbus exception frame
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* sent by the protocol stack.
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*
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* \param ucFunctionCode The Modbus function code for which this handler should
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* be registers. Valid function codes are in the range 1 to 127.
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* \param pxHandler The function handler which should be called in case
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* such a frame is received. If \c NULL a previously registered function handler
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* for this function code is removed.
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*
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* \return eMBErrorCode::MB_ENOERR if the handler has been installed. If no
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* more resources are available it returns eMBErrorCode::MB_ENORES. In this
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* case the values in mbconfig.h should be adjusted. If the argument was not
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* valid it returns eMBErrorCode::MB_EINVAL.
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*/
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eMBErrorCode eMBMasterRegisterCB( UCHAR ucFunctionCode,
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pxMBFunctionHandler pxHandler );
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/* ----------------------- Callback -----------------------------------------*/
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/*! \defgroup modbus_master registers Modbus Registers
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* \code #include "mb_m.h" \endcode
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* The protocol stack does not internally allocate any memory for the
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* registers. This makes the protocol stack very small and also usable on
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* low end targets. In addition the values don't have to be in the memory
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* and could for example be stored in a flash.<br>
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* Whenever the protocol stack requires a value it calls one of the callback
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* function with the register address and the number of registers to read
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* as an argument. The application should then read the actual register values
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* (for example the ADC voltage) and should store the result in the supplied
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* buffer.<br>
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* If the protocol stack wants to update a register value because a write
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* register function was received a buffer with the new register values is
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* passed to the callback function. The function should then use these values
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* to update the application register values.
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*/
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/*! \ingroup modbus_registers
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* \brief Callback function used if the value of a <em>Input Register</em>
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* is required by the protocol stack. The starting register address is given
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* by \c usAddress and the last register is given by <tt>usAddress +
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* usNRegs - 1</tt>.
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*
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* \param pucRegBuffer A buffer where the callback function should write
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* the current value of the modbus registers to.
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* \param usAddress The starting address of the register. Input registers
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* are in the range 1 - 65535.
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* \param usNRegs Number of registers the callback function must supply.
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*
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* \return The function must return one of the following error codes:
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* - eMBErrorCode::MB_ENOERR If no error occurred. In this case a normal
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* Modbus response is sent.
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* - eMBErrorCode::MB_ENOREG If the application does not map an coils
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* within the requested address range. In this case a
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* <b>ILLEGAL DATA ADDRESS</b> is sent as a response.
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*/
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eMBErrorCode eMBMasterRegInputCB( UCHAR * pucRegBuffer, USHORT usAddress,
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USHORT usNRegs );
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/*! \ingroup modbus_registers
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* \brief Callback function used if a <em>Holding Register</em> value is
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* read or written by the protocol stack. The starting register address
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* is given by \c usAddress and the last register is given by
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* <tt>usAddress + usNRegs - 1</tt>.
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*
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* \param pucRegBuffer If the application registers values should be updated the
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* buffer points to the new registers values. If the protocol stack needs
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* to now the current values the callback function should write them into
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* this buffer.
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* \param usAddress The starting address of the register.
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* \param usNRegs Number of registers to read or write.
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* \param eMode If eMBRegisterMode::MB_REG_WRITE the application register
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* values should be updated from the values in the buffer. For example
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* this would be the case when the Modbus master has issued an
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* <b>WRITE SINGLE REGISTER</b> command.
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* If the value eMBRegisterMode::MB_REG_READ the application should copy
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* the current values into the buffer \c pucRegBuffer.
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*
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* \return The function must return one of the following error codes:
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* - eMBErrorCode::MB_ENOERR If no error occurred. In this case a normal
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* Modbus response is sent.
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* - eMBErrorCode::MB_ENOREG If the application does not map an coils
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* within the requested address range. In this case a
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* <b>ILLEGAL DATA ADDRESS</b> is sent as a response.
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*/
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eMBErrorCode eMBMasterRegHoldingCB( UCHAR * pucRegBuffer, USHORT usAddress,
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USHORT usNRegs, eMBRegisterMode eMode );
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/*! \ingroup modbus_registers
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* \brief Callback function used if a <em>Coil Register</em> value is
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* read or written by the protocol stack. If you are going to use
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* this function you might use the functions xMBUtilSetBits( ) and
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* xMBUtilGetBits( ) for working with bitfields.
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*
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* \param pucRegBuffer The bits are packed in bytes where the first coil
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* starting at address \c usAddress is stored in the LSB of the
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* first byte in the buffer <code>pucRegBuffer</code>.
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* If the buffer should be written by the callback function unused
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* coil values (I.e. if not a multiple of eight coils is used) should be set
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* to zero.
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* \param usAddress The first coil number.
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* \param usNCoils Number of coil values requested.
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* \param eMode If eMBRegisterMode::MB_REG_WRITE the application values should
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* be updated from the values supplied in the buffer \c pucRegBuffer.
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* If eMBRegisterMode::MB_REG_READ the application should store the current
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* values in the buffer \c pucRegBuffer.
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*
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* \return The function must return one of the following error codes:
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* - eMBErrorCode::MB_ENOERR If no error occurred. In this case a normal
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* Modbus response is sent.
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* - eMBErrorCode::MB_ENOREG If the application does not map an coils
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* within the requested address range. In this case a
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* <b>ILLEGAL DATA ADDRESS</b> is sent as a response.
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*/
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eMBErrorCode eMBMasterRegCoilsCB( UCHAR * pucRegBuffer, USHORT usAddress,
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USHORT usNCoils, eMBRegisterMode eMode );
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/*! \ingroup modbus_registers
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* \brief Callback function used if a <em>Input Discrete Register</em> value is
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* read by the protocol stack.
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*
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* If you are going to use his function you might use the functions
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* xMBUtilSetBits( ) and xMBUtilGetBits( ) for working with bitfields.
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*
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* \param pucRegBuffer The buffer should be updated with the current
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* coil values. The first discrete input starting at \c usAddress must be
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* stored at the LSB of the first byte in the buffer. If the requested number
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* is not a multiple of eight the remaining bits should be set to zero.
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* \param usAddress The starting address of the first discrete input.
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* \param usNDiscrete Number of discrete input values.
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* \return The function must return one of the following error codes:
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* - eMBErrorCode::MB_ENOERR If no error occurred. In this case a normal
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* Modbus response is sent.
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* - eMBErrorCode::MB_ENOREG If the application does not map an coils
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* within the requested address range. In this case a
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* <b>ILLEGAL DATA ADDRESS</b> is sent as a response.
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*/
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eMBErrorCode eMBMasterRegDiscreteCB( UCHAR * pucRegBuffer, USHORT usAddress,
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USHORT usNDiscrete );
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/*! \ingroup modbus
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*\brief These Modbus functions are called for user when Modbus run in Master Mode.
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*/
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eMBMasterReqErrCode
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eMBMasterReqReadInputRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usNRegs, LONG lTimeOut );
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eMBMasterReqErrCode
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eMBMasterReqWriteHoldingRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usRegData, LONG lTimeOut );
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eMBMasterReqErrCode
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eMBMasterReqWriteMultipleHoldingRegister( UCHAR ucSndAddr, USHORT usRegAddr,
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USHORT usNRegs, USHORT * pusDataBuffer, LONG lTimeOut );
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eMBMasterReqErrCode
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eMBMasterReqReadHoldingRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usNRegs, LONG lTimeOut );
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eMBMasterReqErrCode
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eMBMasterReqReadWriteMultipleHoldingRegister( UCHAR ucSndAddr,
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USHORT usReadRegAddr, USHORT usNReadRegs, USHORT * pusDataBuffer,
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USHORT usWriteRegAddr, USHORT usNWriteRegs, LONG lTimeOut );
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eMBMasterReqErrCode
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eMBMasterReqReadCoils( UCHAR ucSndAddr, USHORT usCoilAddr, USHORT usNCoils, LONG lTimeOut );
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eMBMasterReqErrCode
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eMBMasterReqWriteCoil( UCHAR ucSndAddr, USHORT usCoilAddr, USHORT usCoilData, LONG lTimeOut );
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eMBMasterReqErrCode
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eMBMasterReqWriteMultipleCoils( UCHAR ucSndAddr,
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USHORT usCoilAddr, USHORT usNCoils, UCHAR * pucDataBuffer, LONG lTimeOut );
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eMBMasterReqErrCode
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eMBMasterReqReadDiscreteInputs( UCHAR ucSndAddr, USHORT usDiscreteAddr, USHORT usNDiscreteIn, LONG lTimeOut );
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eMBException
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eMBMasterFuncReportSlaveID( UCHAR * pucFrame, USHORT * usLen );
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eMBException
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eMBMasterFuncReadInputRegister( UCHAR * pucFrame, USHORT * usLen );
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eMBException
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eMBMasterFuncReadHoldingRegister( UCHAR * pucFrame, USHORT * usLen );
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eMBException
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eMBMasterFuncWriteHoldingRegister( UCHAR * pucFrame, USHORT * usLen );
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eMBException
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eMBMasterFuncWriteMultipleHoldingRegister( UCHAR * pucFrame, USHORT * usLen );
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eMBException
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eMBMasterFuncReadCoils( UCHAR * pucFrame, USHORT * usLen );
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eMBException
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eMBMasterFuncWriteCoil( UCHAR * pucFrame, USHORT * usLen );
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eMBException
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eMBMasterFuncWriteMultipleCoils( UCHAR * pucFrame, USHORT * usLen );
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eMBException
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eMBMasterFuncReadDiscreteInputs( UCHAR * pucFrame, USHORT * usLen );
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eMBException
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eMBMasterFuncReadWriteMultipleHoldingRegister( UCHAR * pucFrame, USHORT * usLen );
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/* \ingroup modbus
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* \brief These functions are interface for Modbus Master
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*/
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void vMBMasterGetPDUSndBuf( UCHAR ** pucFrame );
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UCHAR ucMBMasterGetDestAddress( void );
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void vMBMasterSetDestAddress( UCHAR Address );
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BOOL xMBMasterGetCBRunInMasterMode( void );
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void vMBMasterSetCBRunInMasterMode( BOOL IsMasterMode );
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USHORT usMBMasterGetPDUSndLength( void );
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void vMBMasterSetPDUSndLength( USHORT SendPDULength );
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void vMBMasterSetCurTimerMode( eMBMasterTimerMode eMBTimerMode );
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void vMBMasterRequestSetType( BOOL xIsBroadcast );
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eMBMasterTimerMode xMBMasterGetCurTimerMode( void );
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BOOL xMBMasterRequestIsBroadcast( void );
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eMBMasterErrorEventType eMBMasterGetErrorType( void );
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void vMBMasterSetErrorType( eMBMasterErrorEventType errorType );
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eMBMasterReqErrCode eMBMasterWaitRequestFinish( void );
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/* ----------------------- Callback -----------------------------------------*/
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#ifdef __cplusplus
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PR_END_EXTERN_C
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#endif
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#endif
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