481 lines
14 KiB
C
481 lines
14 KiB
C
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/****************************************************************************
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* FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
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*
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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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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdlib.h>
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#include <string.h>
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#include "port.h"
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#include "modbus/mb.h"
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#include "modbus/mb_m.h"
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#include "modbus/mbframe.h"
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#include "modbus/mbproto.h"
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#include "modbus/mbfunc.h"
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#include "modbus/mbport.h"
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#ifdef CONFIG_MB_RTU_MASTER
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# include "mbrtu_m.h"
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#endif
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#ifdef CONFIG_MB_ASCII_MASTER
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# include "mbascii.h"
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#endif
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#ifdef CONFIG_MB_TCP_MASTER
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# include "mbtcp.h"
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#endif
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#if defined(CONFIG_MB_RTU_MASTER) || defined(CONFIG_MB_ASCII_MASTER)
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#ifndef CONFIG_MB_PORT_HAS_CLOSE
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# define MB_PORT_HAS_CLOSE 0
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#else
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# define MB_PORT_HAS_CLOSE 1
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static uint8_t ucMBMasterDestAddress;
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static bool xMBRunInMasterMode = false;
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static eMBMasterErrorEventType eMBMasterCurErrorType;
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static enum
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{
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STATE_ENABLED,
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STATE_DISABLED,
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STATE_NOT_INITIALIZED
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} eMBState = STATE_NOT_INITIALIZED;
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/* Functions pointer which are initialized in eMBInit( ). Depending on the
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* mode (RTU or ASCII) the are set to the correct implementations.
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* Using for Modbus Master,Add by Armink 20130813
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*/
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static peMBFrameSend peMBMasterFrameSendCur;
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static pvMBFrameStart pvMBMasterFrameStartCur;
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static pvMBFrameStop pvMBMasterFrameStopCur;
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static peMBFrameReceive peMBMasterFrameReceiveCur;
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static pvMBFrameClose pvMBMasterFrameCloseCur;
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/* Callback functions required by the porting layer. They are called when
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* an external event has happend which includes a timeout or the reception
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* or transmission of a character.
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* Using for Modbus Master,Add by Armink 20130813
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*/
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bool(*pxMBMasterFrameCBByteReceived) (void);
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bool(*pxMBMasterFrameCBTransmitterEmpty) (void);
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bool(*pxMBMasterPortCBTimerExpired) (void);
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bool(*pxMBMasterFrameCBReceiveFSMCur) (void);
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bool(*pxMBMasterFrameCBTransmitFSMCur) (void);
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/* An array of Modbus functions handlers which associates Modbus function
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* codes with implementing functions.
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*/
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static xMBFunctionHandler xMasterFuncHandlers[CONFIG_MB_FUNC_HANDLERS_MAX] = {
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#ifdef CONFIG_MB_FUNC_OTHER_REP_SLAVEID_ENABLED
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/* TODO Add Master function define */
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{MB_FUNC_OTHER_REPORT_SLAVEID, eMBFuncReportSlaveID},
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#endif
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#ifdef CONFIG_MB_MASTER_FUNC_READ_INPUT_ENABLED
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{MB_FUNC_READ_INPUT_REGISTER, eMBMasterFuncReadInputRegister},
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#endif
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#ifdef CONFIG_MB_MASTER_FUNC_READ_HOLDING_ENABLED
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{MB_FUNC_READ_HOLDING_REGISTER, eMBMasterFuncReadHoldingRegister},
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#endif
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#ifdef CONFIG_MB_MASTER_FUNC_WRITE_MULTIPLE_HOLDING_ENABLED
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{MB_FUNC_WRITE_MULTIPLE_REGISTERS, eMBMasterFuncWriteMultipleHoldingRegister},
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#endif
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#ifdef CONFIG_MB_MASTER_FUNC_WRITE_HOLDING_ENABLED
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{MB_FUNC_WRITE_REGISTER, eMBMasterFuncWriteHoldingRegister},
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#endif
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#ifdef CONFIG_MB_MASTER_FUNC_READWRITE_HOLDING_ENABLED
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{MB_FUNC_READWRITE_MULTIPLE_REGISTERS,
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eMBMasterFuncReadWriteMultipleHoldingRegister},
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#endif
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#ifdef CONFIG_MB_MASTER_FUNC_READ_COILS_ENABLED
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{MB_FUNC_READ_COILS, eMBMasterFuncReadCoils},
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#endif
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#ifdef CONFIG_MB_MASTER_FUNC_WRITE_COIL_ENABLED
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{MB_FUNC_WRITE_SINGLE_COIL, eMBMasterFuncWriteCoil},
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#endif
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#ifdef CONFIG_MB_MASTER_FUNC_WRITE_MULTIPLE_COILS_ENABLED
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{MB_FUNC_WRITE_MULTIPLE_COILS, eMBMasterFuncWriteMultipleCoils},
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#endif
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#ifdef CONFIG_MB_MASTER_FUNC_READ_DISCRETE_INPUTS_ENABLED
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{MB_FUNC_READ_DISCRETE_INPUTS, eMBMasterFuncReadDiscreteInputs},
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#endif
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};
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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eMBErrorCode eMBMasterInit(eMBMode eMode, uint8_t ucPort,
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speed_t ulBaudRate, eMBParity eParity)
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{
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eMBErrorCode eStatus = MB_ENOERR;
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switch (eMode)
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{
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#ifdef CONFIG_MB_RTU_MASTER
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case MB_RTU:
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pvMBMasterFrameStartCur = eMBMasterRTUStart;
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pvMBMasterFrameStopCur = eMBMasterRTUStop;
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peMBMasterFrameSendCur = eMBMasterRTUSend;
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peMBMasterFrameReceiveCur = eMBMasterRTUReceive;
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pvMBMasterFrameCloseCur = MB_PORT_HAS_CLOSE ? vMBMasterPortClose : NULL;
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pxMBMasterFrameCBByteReceived = xMBMasterRTUReceiveFSM;
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pxMBMasterFrameCBTransmitterEmpty = xMBMasterRTUTransmitFSM;
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pxMBMasterPortCBTimerExpired = xMBMasterRTUTimerExpired;
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eStatus = eMBMasterRTUInit(ucPort, ulBaudRate, eParity);
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break;
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#endif
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#ifdef CONFIG_MB_ASCII_MASTER
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case MB_ASCII:
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pvMBMasterFrameStartCur = eMBMasterASCIIStart;
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pvMBMasterFrameStopCur = eMBMasterASCIIStop;
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peMBMasterFrameSendCur = eMBMasterASCIISend;
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peMBMasterFrameReceiveCur = eMBMasterASCIIReceive;
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pvMBMasterFrameCloseCur = MB_PORT_HAS_CLOSE ? vMBMasterPortClose : NULL;
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pxMBMasterFrameCBByteReceived = xMBMasterASCIIReceiveFSM;
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pxMBMasterFrameCBTransmitterEmpty = xMBMasterASCIITransmitFSM;
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pxMBMasterPortCBTimerExpired = xMBMasterASCIITimerT1SExpired;
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eStatus = eMBMasterASCIIInit(ucPort, ulBaudRate, eParity);
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break;
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#endif
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default:
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eStatus = MB_EINVAL;
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break;
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}
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if (eStatus == MB_ENOERR)
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{
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if (!xMBMasterPortEventInit())
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{
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/* Port dependent event module initalization failed. */
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eStatus = MB_EPORTERR;
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}
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else
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{
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eMBState = STATE_DISABLED;
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}
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/* Initialize the OS resource for modbus master. */
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vMBMasterOsResInit();
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}
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return eStatus;
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}
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eMBErrorCode eMBMasterClose(void)
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{
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eMBErrorCode eStatus = MB_ENOERR;
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if (eMBState == STATE_DISABLED)
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{
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if (pvMBMasterFrameCloseCur != NULL)
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{
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pvMBMasterFrameCloseCur();
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}
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}
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else
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{
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eStatus = MB_EILLSTATE;
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}
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return eStatus;
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}
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eMBErrorCode eMBMasterEnable(void)
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{
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eMBErrorCode eStatus = MB_ENOERR;
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if (eMBState == STATE_DISABLED)
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{
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/* Activate the protocol stack. */
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pvMBMasterFrameStartCur();
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eMBState = STATE_ENABLED;
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}
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else
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{
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eStatus = MB_EILLSTATE;
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}
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return eStatus;
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}
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eMBErrorCode eMBMasterDisable(void)
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{
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eMBErrorCode eStatus;
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if (eMBState == STATE_ENABLED)
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{
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pvMBMasterFrameStopCur();
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eMBState = STATE_DISABLED;
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eStatus = MB_ENOERR;
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}
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else if (eMBState == STATE_DISABLED)
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{
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eStatus = MB_ENOERR;
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}
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else
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{
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eStatus = MB_EILLSTATE;
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}
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return eStatus;
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}
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eMBErrorCode eMBMasterPoll(void)
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{
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static uint8_t *ucMBFrame;
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static uint8_t ucRcvAddress;
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static uint8_t ucFunctionCode;
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static uint16_t usLength;
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static eMBException eException;
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int i;
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int j;
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eMBErrorCode eStatus = MB_ENOERR;
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eMBMasterEventType eEvent;
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eMBMasterErrorEventType errorType;
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/* Check if the protocol stack is ready. */
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if (eMBState != STATE_ENABLED)
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{
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return MB_EILLSTATE;
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}
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/* Check if there is a event available. If not return control to caller.
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* Otherwise we will handle the event.
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*/
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if (xMBMasterPortEventGet(&eEvent) == true)
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{
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switch (eEvent)
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{
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case EV_MASTER_READY:
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break;
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case EV_MASTER_FRAME_RECEIVED:
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eStatus =
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peMBMasterFrameReceiveCur(&ucRcvAddress, &ucMBFrame, &usLength);
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/* Check if the frame is for us. If not, send an error process event. */
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if ((eStatus == MB_ENOERR) &&
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(ucRcvAddress == ucMBMasterGetDestAddress()))
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{
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(void)xMBMasterPortEventPost(EV_MASTER_EXECUTE);
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}
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else
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{
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vMBMasterSetErrorType(EV_ERROR_RECEIVE_DATA);
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(void)xMBMasterPortEventPost(EV_MASTER_ERROR_PROCESS);
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}
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break;
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case EV_MASTER_EXECUTE:
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ucFunctionCode = ucMBFrame[MB_PDU_FUNC_OFF];
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eException = MB_EX_ILLEGAL_FUNCTION;
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/* If receive frame has exception. The receive function code highest
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* bit is 1.
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*/
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if (ucFunctionCode >> 7)
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{
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eException = (eMBException) ucMBFrame[MB_PDU_DATA_OFF];
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}
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else
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{
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for (i = 0; i < CONFIG_MB_FUNC_HANDLERS_MAX; i++)
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{
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/* No more function handlers registered. Abort. */
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if (xMasterFuncHandlers[i].ucFunctionCode == 0)
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{
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break;
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}
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else if (xMasterFuncHandlers[i].ucFunctionCode ==
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ucFunctionCode)
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{
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vMBMasterSetCBRunInMasterMode(true);
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/* If master request is broadcast, the master need
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* execute function for all slave. */
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if (xMBMasterRequestIsBroadcast())
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{
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usLength = usMBMasterGetPDUSndLength();
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for (j = 1; j <= CONFIG_MB_MASTER_TOTAL_SLAVE_NUM;
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j++)
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{
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vMBMasterSetDestAddress(j);
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eException =
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xMasterFuncHandlers[i].pxHandler(ucMBFrame,
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&usLength);
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}
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}
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else
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{
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eException =
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xMasterFuncHandlers[i].pxHandler(ucMBFrame,
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&usLength);
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}
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vMBMasterSetCBRunInMasterMode(false);
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break;
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}
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}
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}
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/* If master has exception, Master will send error process. Otherwise
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* the Master is idle.
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*/
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if (eException != MB_EX_NONE)
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{
|
||
|
|
vMBMasterSetErrorType(EV_ERROR_EXECUTE_FUNCTION);
|
||
|
|
(void)xMBMasterPortEventPost(EV_MASTER_ERROR_PROCESS);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
vMBMasterCBRequestSuccess();
|
||
|
|
vMBMasterRunResRelease();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case EV_MASTER_FRAME_SENT:
|
||
|
|
|
||
|
|
/* Master is busy now. */
|
||
|
|
|
||
|
|
vMBMasterGetPDUSndBuf(&ucMBFrame);
|
||
|
|
eStatus =
|
||
|
|
peMBMasterFrameSendCur(ucMBMasterGetDestAddress(), ucMBFrame,
|
||
|
|
usMBMasterGetPDUSndLength());
|
||
|
|
break;
|
||
|
|
|
||
|
|
case EV_MASTER_ERROR_PROCESS:
|
||
|
|
|
||
|
|
/* Execute specified error process callback function. */
|
||
|
|
|
||
|
|
errorType = eMBMasterGetErrorType();
|
||
|
|
vMBMasterGetPDUSndBuf(&ucMBFrame);
|
||
|
|
switch (errorType)
|
||
|
|
{
|
||
|
|
case EV_ERROR_RESPOND_TIMEOUT:
|
||
|
|
vMBMasterErrorCBRespondTimeout(ucMBMasterGetDestAddress(),
|
||
|
|
ucMBFrame,
|
||
|
|
usMBMasterGetPDUSndLength());
|
||
|
|
break;
|
||
|
|
case EV_ERROR_RECEIVE_DATA:
|
||
|
|
vMBMasterErrorCBReceiveData(ucMBMasterGetDestAddress(),
|
||
|
|
ucMBFrame,
|
||
|
|
usMBMasterGetPDUSndLength());
|
||
|
|
break;
|
||
|
|
case EV_ERROR_EXECUTE_FUNCTION:
|
||
|
|
vMBMasterErrorCBExecuteFunction(ucMBMasterGetDestAddress(),
|
||
|
|
ucMBFrame,
|
||
|
|
usMBMasterGetPDUSndLength());
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
vMBMasterRunResRelease();
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return MB_ENOERR;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Get whether the Modbus Master is run in master mode.*/
|
||
|
|
|
||
|
|
bool xMBMasterGetCBRunInMasterMode(void)
|
||
|
|
{
|
||
|
|
return xMBRunInMasterMode;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Set whether the Modbus Master is run in master mode.*/
|
||
|
|
|
||
|
|
void vMBMasterSetCBRunInMasterMode(bool IsMasterMode)
|
||
|
|
{
|
||
|
|
xMBRunInMasterMode = IsMasterMode;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Get Modbus Master send destination address. */
|
||
|
|
|
||
|
|
uint8_t ucMBMasterGetDestAddress(void)
|
||
|
|
{
|
||
|
|
return ucMBMasterDestAddress;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Set Modbus Master send destination address. */
|
||
|
|
|
||
|
|
void vMBMasterSetDestAddress(uint8_t Address)
|
||
|
|
{
|
||
|
|
ucMBMasterDestAddress = Address;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Get Modbus Master current error event type. */
|
||
|
|
|
||
|
|
eMBMasterErrorEventType eMBMasterGetErrorType(void)
|
||
|
|
{
|
||
|
|
return eMBMasterCurErrorType;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Set Modbus Master current error event type. */
|
||
|
|
|
||
|
|
void vMBMasterSetErrorType(eMBMasterErrorEventType errorType)
|
||
|
|
{
|
||
|
|
eMBMasterCurErrorType = errorType;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* defined(CONFIG_MB_RTU_MASTER) || defined(CONFIG_MB_ASCII_MASTER) */
|