Tooltron

PART=t1634

MCU=attiny1634

#MCU=atmega2560

F_CPU=1000000

SRC=main.c serial.c \

		freemodbus/port/*.c \

		freemodbus/modbus/mb.c \

		freemodbus/modbus/rtu/mbrtu.c \

		freemodbus/modbus/ascii/mbascii.c \

		freemodbus/modbus/functions/*.c

HDR=tooltron_mb.h serial.h freemodbus/port/*.h

# TODO we can exclude modbus functions we don't need if the generated hex file

# ends up too large

FLAGS=-Os -Wall -mmcu=$(MCU) -DF_CPU=$(F_CPU) \

			-Ifreemodbus/port \

			-Ifreemodbus/modbus/rtu \

			-Ifreemodbus/modbus/ascii \

			-Ifreemodbus/modbus/include

PROG=avrispMKII

all: toolbox.hex

%.hex: %.elf

	avr-objcopy -j .text -j .data -O ihex $< $@

toolbox.elf: $(SRC) $(HDR)

	avr-gcc $(FLAGS) $(SRC) -o $@

%.asm: %.c

	avr-gcc -S $(FLAGS) $< -o $@

program: toolbox.hex

	avrdude -p $(PART) -c $(PROG) -P usb -B 1 -F -U flash:w:toolbox.hex

clean:

	rm -f *.elf *.hex

/* 

 * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.

 * Copyright (c) 2006 Christian Walter <wolti@sil.at>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * File: $Id: mbascii.c,v 1.17 2010/06/06 13:47:07 wolti Exp $

 */

/* ----------------------- System includes ----------------------------------*/

#include "stdlib.h"

#include "string.h"

/* ----------------------- Platform includes --------------------------------*/

#include "port.h"

/* ----------------------- Modbus includes ----------------------------------*/

#include "mb.h"

#include "mbconfig.h"

#include "mbascii.h"

#include "mbframe.h"

#include "mbcrc.h"

#include "mbport.h"

#if MB_ASCII_ENABLED > 0

/* ----------------------- Defines ------------------------------------------*/

#define MB_ASCII_DEFAULT_CR     '\r'    /*!< Default CR character for Modbus ASCII. */

#define MB_ASCII_DEFAULT_LF     '\n'    /*!< Default LF character for Modbus ASCII. */

#define MB_SER_PDU_SIZE_MIN     3       /*!< Minimum size of a Modbus ASCII frame. */

#define MB_SER_PDU_SIZE_MAX     256     /*!< Maximum size of a Modbus ASCII frame. */

#define MB_SER_PDU_SIZE_LRC     1       /*!< Size of LRC field in PDU. */

#define MB_SER_PDU_ADDR_OFF     0       /*!< Offset of slave address in Ser-PDU. */

#define MB_SER_PDU_PDU_OFF      1       /*!< Offset of Modbus-PDU in Ser-PDU. */

/* ----------------------- Type definitions ---------------------------------*/

typedef enum

{

    STATE_RX_IDLE,              /*!< Receiver is in idle state. */

    STATE_RX_RCV,               /*!< Frame is beeing received. */

    STATE_RX_WAIT_EOF           /*!< Wait for End of Frame. */

} eMBRcvState;

typedef enum

{

    STATE_TX_IDLE,              /*!< Transmitter is in idle state. */

    STATE_TX_START,             /*!< Starting transmission (':' sent). */

    STATE_TX_DATA,              /*!< Sending of data (Address, Data, LRC). */

    STATE_TX_END,               /*!< End of transmission. */

    STATE_TX_NOTIFY             /*!< Notify sender that the frame has been sent. */

} eMBSndState;

typedef enum

{

    BYTE_HIGH_NIBBLE,           /*!< Character for high nibble of byte. */

    BYTE_LOW_NIBBLE             /*!< Character for low nibble of byte. */

} eMBBytePos;

/* ----------------------- Static functions ---------------------------------*/

static UCHAR    prvucMBCHAR2BIN( UCHAR ucCharacter );

static UCHAR    prvucMBBIN2CHAR( UCHAR ucByte );

static UCHAR    prvucMBLRC( UCHAR * pucFrame, USHORT usLen );

/* ----------------------- Static variables ---------------------------------*/

static volatile eMBSndState eSndState;

static volatile eMBRcvState eRcvState;

/* We reuse the Modbus RTU buffer because only one buffer is needed and the

 * RTU buffer is bigger. */

extern volatile UCHAR ucRTUBuf[];

static volatile UCHAR *ucASCIIBuf = ucRTUBuf;

static volatile USHORT usRcvBufferPos;

static volatile eMBBytePos eBytePos;

static volatile UCHAR *pucSndBufferCur;

static volatile USHORT usSndBufferCount;

static volatile UCHAR ucLRC;

static volatile UCHAR ucMBLFCharacter;

/* ----------------------- Start implementation -----------------------------*/

eMBErrorCode

eMBASCIIInit( UCHAR ucSlaveAddress, UCHAR ucPort, ULONG ulBaudRate, eMBParity eParity )

{

    eMBErrorCode    eStatus = MB_ENOERR;

    ( void )ucSlaveAddress;

    ENTER_CRITICAL_SECTION(  );

    ucMBLFCharacter = MB_ASCII_DEFAULT_LF;

    if( xMBPortSerialInit( ucPort, ulBaudRate, 7, eParity ) != TRUE )

    {

        eStatus = MB_EPORTERR;

    }

    else if( xMBPortTimersInit( MB_ASCII_TIMEOUT_SEC * 20000UL ) != TRUE )

    {

        eStatus = MB_EPORTERR;

    }

    EXIT_CRITICAL_SECTION(  );

    return eStatus;

}

void

eMBASCIIStart( void )

{

    ENTER_CRITICAL_SECTION(  );

    vMBPortSerialEnable( TRUE, FALSE );

    eRcvState = STATE_RX_IDLE;

    EXIT_CRITICAL_SECTION(  );

    /* No special startup required for ASCII. */

    ( void )xMBPortEventPost( EV_READY );

}

void

eMBASCIIStop( void )

{

    ENTER_CRITICAL_SECTION(  );

    vMBPortSerialEnable( FALSE, FALSE );

    vMBPortTimersDisable(  );

    EXIT_CRITICAL_SECTION(  );

}

eMBErrorCode

eMBASCIIReceive( UCHAR * pucRcvAddress, UCHAR ** pucFrame, USHORT * pusLength )

{

    eMBErrorCode    eStatus = MB_ENOERR;

    ENTER_CRITICAL_SECTION(  );

    assert( usRcvBufferPos < MB_SER_PDU_SIZE_MAX );

    /* Length and CRC check */

    if( ( usRcvBufferPos >= MB_SER_PDU_SIZE_MIN )

        && ( prvucMBLRC( ( UCHAR * ) ucASCIIBuf, usRcvBufferPos ) == 0 ) )

    {

        /* Save the address field. All frames are passed to the upper layed

         * and the decision if a frame is used is done there.

         */

        *pucRcvAddress = ucASCIIBuf[MB_SER_PDU_ADDR_OFF];

        /* Total length of Modbus-PDU is Modbus-Serial-Line-PDU minus

         * size of address field and CRC checksum.

         */

        *pusLength = ( USHORT )( usRcvBufferPos - MB_SER_PDU_PDU_OFF - MB_SER_PDU_SIZE_LRC );

        /* Return the start of the Modbus PDU to the caller. */

        *pucFrame = ( UCHAR * ) & ucASCIIBuf[MB_SER_PDU_PDU_OFF];

    }

    else

    {

        eStatus = MB_EIO;

    }

    EXIT_CRITICAL_SECTION(  );

    return eStatus;

}

eMBErrorCode

eMBASCIISend( UCHAR ucSlaveAddress, const UCHAR * pucFrame, USHORT usLength )

{

    eMBErrorCode    eStatus = MB_ENOERR;

    UCHAR           usLRC;

    ENTER_CRITICAL_SECTION(  );

    /* Check if the receiver is still in idle state. If not we where too

     * slow with processing the received frame and the master sent another

     * frame on the network. We have to abort sending the frame.

     */

    if( eRcvState == STATE_RX_IDLE )

    {

        /* First byte before the Modbus-PDU is the slave address. */

        pucSndBufferCur = ( UCHAR * ) pucFrame - 1;

        usSndBufferCount = 1;

        /* Now copy the Modbus-PDU into the Modbus-Serial-Line-PDU. */

        pucSndBufferCur[MB_SER_PDU_ADDR_OFF] = ucSlaveAddress;

        usSndBufferCount += usLength;

        /* Calculate LRC checksum for Modbus-Serial-Line-PDU. */

        usLRC = prvucMBLRC( ( UCHAR * ) pucSndBufferCur, usSndBufferCount );

        ucASCIIBuf[usSndBufferCount++] = usLRC;

        /* Activate the transmitter. */

        eSndState = STATE_TX_START;

        vMBPortSerialEnable( FALSE, TRUE );

    }

    else

    {

        eStatus = MB_EIO;

    }

    EXIT_CRITICAL_SECTION(  );

    return eStatus;

}

BOOL

xMBASCIIReceiveFSM( void )

{

    BOOL            xNeedPoll = FALSE;

    UCHAR           ucByte;

    UCHAR           ucResult;

    assert( eSndState == STATE_TX_IDLE );

    ( void )xMBPortSerialGetByte( ( CHAR * ) & ucByte );

    switch ( eRcvState )

    {

        /* A new character is received. If the character is a ':' the input

         * buffer is cleared. A CR-character signals the end of the data

         * block. Other characters are part of the data block and their

         * ASCII value is converted back to a binary representation.

         */

    case STATE_RX_RCV:

        /* Enable timer for character timeout. */

        vMBPortTimersEnable(  );

        if( ucByte == ':' )

        {

            /* Empty receive buffer. */

            eBytePos = BYTE_HIGH_NIBBLE;

            usRcvBufferPos = 0;

        }

        else if( ucByte == MB_ASCII_DEFAULT_CR )

        {

            eRcvState = STATE_RX_WAIT_EOF;

        }

        else

        {

            ucResult = prvucMBCHAR2BIN( ucByte );

            switch ( eBytePos )

            {

                /* High nibble of the byte comes first. We check for

                 * a buffer overflow here. */

            case BYTE_HIGH_NIBBLE:

                if( usRcvBufferPos < MB_SER_PDU_SIZE_MAX )

                {

                    ucASCIIBuf[usRcvBufferPos] = ( UCHAR )( ucResult << 4 );

                    eBytePos = BYTE_LOW_NIBBLE;

                    break;

                }

                else

                {

                    /* not handled in Modbus specification but seems

                     * a resonable implementation. */

                    eRcvState = STATE_RX_IDLE;

                    /* Disable previously activated timer because of error state. */

                    vMBPortTimersDisable(  );

                }

                break;

            case BYTE_LOW_NIBBLE:

                ucASCIIBuf[usRcvBufferPos] |= ucResult;

                usRcvBufferPos++;

                eBytePos = BYTE_HIGH_NIBBLE;

                break;

            }

        }

        break;

    case STATE_RX_WAIT_EOF:

        if( ucByte == ucMBLFCharacter )

        {

            /* Disable character timeout timer because all characters are

             * received. */

            vMBPortTimersDisable(  );

            /* Receiver is again in idle state. */

            eRcvState = STATE_RX_IDLE;

            /* Notify the caller of eMBASCIIReceive that a new frame

             * was received. */

            xNeedPoll = xMBPortEventPost( EV_FRAME_RECEIVED );

        }

        else if( ucByte == ':' )

        {

            /* Empty receive buffer and back to receive state. */

            eBytePos = BYTE_HIGH_NIBBLE;

            usRcvBufferPos = 0;

            eRcvState = STATE_RX_RCV;

            /* Enable timer for character timeout. */

            vMBPortTimersEnable(  );

        }

        else

        {

            /* Frame is not okay. Delete entire frame. */

            eRcvState = STATE_RX_IDLE;

        }

        break;

    case STATE_RX_IDLE:

        if( ucByte == ':' )

        {

            /* Enable timer for character timeout. */

            vMBPortTimersEnable(  );

            /* Reset the input buffers to store the frame. */

            usRcvBufferPos = 0;;

            eBytePos = BYTE_HIGH_NIBBLE;

            eRcvState = STATE_RX_RCV;

        }

        break;

    }

    return xNeedPoll;

}

BOOL

xMBASCIITransmitFSM( void )

{

    BOOL            xNeedPoll = FALSE;

    UCHAR           ucByte;

    assert( eRcvState == STATE_RX_IDLE );

    switch ( eSndState )

    {

        /* Start of transmission. The start of a frame is defined by sending

         * the character ':'. */

    case STATE_TX_START:

        ucByte = ':';

        xMBPortSerialPutByte( ( CHAR )ucByte );

        eSndState = STATE_TX_DATA;

        eBytePos = BYTE_HIGH_NIBBLE;

        break;

        /* Send the data block. Each data byte is encoded as a character hex

         * stream with the high nibble sent first and the low nibble sent

         * last. If all data bytes are exhausted we send a '\r' character

         * to end the transmission. */

    case STATE_TX_DATA:

        if( usSndBufferCount > 0 )

        {

            switch ( eBytePos )

            {

            case BYTE_HIGH_NIBBLE:

                ucByte = prvucMBBIN2CHAR( ( UCHAR )( *pucSndBufferCur >> 4 ) );

                xMBPortSerialPutByte( ( CHAR ) ucByte );

                eBytePos = BYTE_LOW_NIBBLE;

                break;

            case BYTE_LOW_NIBBLE:

                ucByte = prvucMBBIN2CHAR( ( UCHAR )( *pucSndBufferCur & 0x0F ) );

                xMBPortSerialPutByte( ( CHAR )ucByte );

                pucSndBufferCur++;

                eBytePos = BYTE_HIGH_NIBBLE;

                usSndBufferCount--;

                break;

            }

        }

        else

        {

            xMBPortSerialPutByte( MB_ASCII_DEFAULT_CR );

            eSndState = STATE_TX_END;

        }

        break;

        /* Finish the frame by sending a LF character. */

    case STATE_TX_END:

        xMBPortSerialPutByte( ( CHAR )ucMBLFCharacter );

        /* We need another state to make sure that the CR character has

         * been sent. */

        eSndState = STATE_TX_NOTIFY;

        break;

        /* Notify the task which called eMBASCIISend that the frame has

         * been sent. */

    case STATE_TX_NOTIFY:

        eSndState = STATE_TX_IDLE;

        xNeedPoll = xMBPortEventPost( EV_FRAME_SENT );

        /* Disable transmitter. This prevents another transmit buffer

         * empty interrupt. */

        vMBPortSerialEnable( TRUE, FALSE );

        eSndState = STATE_TX_IDLE;

        break;

        /* We should not get a transmitter event if the transmitter is in

         * idle state.  */

    case STATE_TX_IDLE:

        /* enable receiver/disable transmitter. */

        vMBPortSerialEnable( TRUE, FALSE );

        break;

    }

    return xNeedPoll;

}

BOOL

xMBASCIITimerT1SExpired( void )

{

    switch ( eRcvState )

    {

        /* If we have a timeout we go back to the idle state and wait for

         * the next frame.

         */

    case STATE_RX_RCV:

    case STATE_RX_WAIT_EOF:

        eRcvState = STATE_RX_IDLE;

        break;

    default:

        assert( ( eRcvState == STATE_RX_RCV ) || ( eRcvState == STATE_RX_WAIT_EOF ) );

        break;

    }

    vMBPortTimersDisable(  );

    /* no context switch required. */

    return FALSE;

}

static          UCHAR

prvucMBCHAR2BIN( UCHAR ucCharacter )

{

    if( ( ucCharacter >= '0' ) && ( ucCharacter <= '9' ) )

    {

        return ( UCHAR )( ucCharacter - '0' );

    }

    else if( ( ucCharacter >= 'A' ) && ( ucCharacter <= 'F' ) )

    {

        return ( UCHAR )( ucCharacter - 'A' + 0x0A );

    }

    else

    {

        return 0xFF;

    }

}

static          UCHAR

prvucMBBIN2CHAR( UCHAR ucByte )

{

    if( ucByte <= 0x09 )

    {

        return ( UCHAR )( '0' + ucByte );

    }

    else if( ( ucByte >= 0x0A ) && ( ucByte <= 0x0F ) )

    {

        return ( UCHAR )( ucByte - 0x0A + 'A' );

    }

    else

    {

        /* Programming error. */

        assert( 0 );

    }

    return '0';

}

static          UCHAR

prvucMBLRC( UCHAR * pucFrame, USHORT usLen )

{

    UCHAR           ucLRC = 0;  /* LRC char initialized */

    while( usLen-- )

    {

        ucLRC += *pucFrame++;   /* Add buffer byte without carry */

    }

    /* Return twos complement */

    ucLRC = ( UCHAR ) ( -( ( CHAR ) ucLRC ) );

    return ucLRC;

}

#endif

/* 

 * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.

 * Copyright (c) 2006 Christian Walter <wolti@sil.at>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * File: $Id: mbascii.h,v 1.8 2006/12/07 22:10:34 wolti Exp $

 */

#ifndef _MB_ASCII_H

#define _MB_ASCII_H

#ifdef __cplusplus

PR_BEGIN_EXTERN_C

#endif

#if MB_ASCII_ENABLED > 0

eMBErrorCode    eMBASCIIInit( UCHAR slaveAddress, UCHAR ucPort,

                              ULONG ulBaudRate, eMBParity eParity );

void            eMBASCIIStart( void );

void            eMBASCIIStop( void );

eMBErrorCode    eMBASCIIReceive( UCHAR * pucRcvAddress, UCHAR ** pucFrame,

                                 USHORT * pusLength );

eMBErrorCode    eMBASCIISend( UCHAR slaveAddress, const UCHAR * pucFrame,

                              USHORT usLength );

BOOL            xMBASCIIReceiveFSM( void );

BOOL            xMBASCIITransmitFSM( void );

BOOL            xMBASCIITimerT1SExpired( void );

#endif

#ifdef __cplusplus

PR_END_EXTERN_C

#endif

#endif

/* 

 * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.

 * Copyright (c) 2006 Christian Walter <wolti@sil.at>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * File: $Id: mbfunccoils.c,v 1.8 2007/02/18 23:47:16 wolti Exp $

 */

/* ----------------------- System includes ----------------------------------*/

#include "stdlib.h"

#include "string.h"

/* ----------------------- Platform includes --------------------------------*/

#include "port.h"

/* ----------------------- Modbus includes ----------------------------------*/

#include "mb.h"

#include "mbframe.h"

#include "mbproto.h"

#include "mbconfig.h"

/* ----------------------- Defines ------------------------------------------*/

#define MB_PDU_FUNC_READ_ADDR_OFF           ( MB_PDU_DATA_OFF )

#define MB_PDU_FUNC_READ_COILCNT_OFF        ( MB_PDU_DATA_OFF + 2 )

#define MB_PDU_FUNC_READ_SIZE               ( 4 )

#define MB_PDU_FUNC_READ_COILCNT_MAX        ( 0x07D0 )

#define MB_PDU_FUNC_WRITE_ADDR_OFF          ( MB_PDU_DATA_OFF )

#define MB_PDU_FUNC_WRITE_VALUE_OFF         ( MB_PDU_DATA_OFF + 2 )

#define MB_PDU_FUNC_WRITE_SIZE              ( 4 )

#define MB_PDU_FUNC_WRITE_MUL_ADDR_OFF      ( MB_PDU_DATA_OFF )

#define MB_PDU_FUNC_WRITE_MUL_COILCNT_OFF   ( MB_PDU_DATA_OFF + 2 )

#define MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF   ( MB_PDU_DATA_OFF + 4 )

#define MB_PDU_FUNC_WRITE_MUL_VALUES_OFF    ( MB_PDU_DATA_OFF + 5 )

#define MB_PDU_FUNC_WRITE_MUL_SIZE_MIN      ( 5 )

#define MB_PDU_FUNC_WRITE_MUL_COILCNT_MAX   ( 0x07B0 )

/* ----------------------- Static functions ---------------------------------*/

eMBException    prveMBError2Exception( eMBErrorCode eErrorCode );

/* ----------------------- Start implementation -----------------------------*/

#if MB_FUNC_READ_COILS_ENABLED > 0

eMBException

eMBFuncReadCoils( UCHAR * pucFrame, USHORT * usLen )

{

    USHORT          usRegAddress;

    USHORT          usCoilCount;

    UCHAR           ucNBytes;

    UCHAR          *pucFrameCur;

    eMBException    eStatus = MB_EX_NONE;

    eMBErrorCode    eRegStatus;

    if( *usLen == ( MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN ) )

    {

        usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 );

        usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] );

        usRegAddress++;

        usCoilCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_COILCNT_OFF] << 8 );

        usCoilCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_COILCNT_OFF + 1] );

        /* Check if the number of registers to read is valid. If not

         * return Modbus illegal data value exception. 

         */

        if( ( usCoilCount >= 1 ) &&

            ( usCoilCount < MB_PDU_FUNC_READ_COILCNT_MAX ) )

        {

            /* Set the current PDU data pointer to the beginning. */

            pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF];

            *usLen = MB_PDU_FUNC_OFF;

            /* First byte contains the function code. */

            *pucFrameCur++ = MB_FUNC_READ_COILS;

            *usLen += 1;

            /* Test if the quantity of coils is a multiple of 8. If not last

             * byte is only partially field with unused coils set to zero. */

            if( ( usCoilCount & 0x0007 ) != 0 )

            {

                ucNBytes = ( UCHAR )( usCoilCount / 8 + 1 );

            }

            else

            {

                ucNBytes = ( UCHAR )( usCoilCount / 8 );

            }

            *pucFrameCur++ = ucNBytes;

            *usLen += 1;

            eRegStatus =

                eMBRegCoilsCB( pucFrameCur, usRegAddress, usCoilCount,

                               MB_REG_READ );

            /* If an error occured convert it into a Modbus exception. */

            if( eRegStatus != MB_ENOERR )

            {

                eStatus = prveMBError2Exception( eRegStatus );

            }

            else

            {

                /* The response contains the function code, the starting address

                 * and the quantity of registers. We reuse the old values in the 

                 * buffer because they are still valid. */

                *usLen += ucNBytes;;

            }

        }

        else

        {

            eStatus = MB_EX_ILLEGAL_DATA_VALUE;

        }

    }

    else

    {

        /* Can't be a valid read coil register request because the length

         * is incorrect. */

        eStatus = MB_EX_ILLEGAL_DATA_VALUE;

    }

    return eStatus;

}

#if MB_FUNC_WRITE_COIL_ENABLED > 0

eMBException

eMBFuncWriteCoil( UCHAR * pucFrame, USHORT * usLen )

{

    USHORT          usRegAddress;

    UCHAR           ucBuf[2];

    eMBException    eStatus = MB_EX_NONE;

    eMBErrorCode    eRegStatus;

    if( *usLen == ( MB_PDU_FUNC_WRITE_SIZE + MB_PDU_SIZE_MIN ) )

    {

        usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF] << 8 );

        usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF + 1] );

        usRegAddress++;

        if( ( pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF + 1] == 0x00 ) &&

            ( ( pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF] == 0xFF ) ||

              ( pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF] == 0x00 ) ) )

        {

            ucBuf[1] = 0;

            if( pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF] == 0xFF )

            {

                ucBuf[0] = 1;

            }

            else

            {

                ucBuf[0] = 0;

            }

            eRegStatus =

                eMBRegCoilsCB( &ucBuf[0], usRegAddress, 1, MB_REG_WRITE );

            /* If an error occured convert it into a Modbus exception. */

            if( eRegStatus != MB_ENOERR )

            {

                eStatus = prveMBError2Exception( eRegStatus );

            }

        }

        else

        {

            eStatus = MB_EX_ILLEGAL_DATA_VALUE;

        }

    }

    else

    {

        /* Can't be a valid write coil register request because the length

         * is incorrect. */

        eStatus = MB_EX_ILLEGAL_DATA_VALUE;

    }

    return eStatus;

}

#endif

#if MB_FUNC_WRITE_MULTIPLE_COILS_ENABLED > 0

eMBException

eMBFuncWriteMultipleCoils( UCHAR * pucFrame, USHORT * usLen )

{

    USHORT          usRegAddress;

    USHORT          usCoilCnt;

    UCHAR           ucByteCount;

    UCHAR           ucByteCountVerify;

    eMBException    eStatus = MB_EX_NONE;

    eMBErrorCode    eRegStatus;

    if( *usLen > ( MB_PDU_FUNC_WRITE_SIZE + MB_PDU_SIZE_MIN ) )

    {

        usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF] << 8 );

        usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF + 1] );

        usRegAddress++;

        usCoilCnt = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_COILCNT_OFF] << 8 );

        usCoilCnt |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_COILCNT_OFF + 1] );

        ucByteCount = pucFrame[MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF];

        /* Compute the number of expected bytes in the request. */

        if( ( usCoilCnt & 0x0007 ) != 0 )

        {

            ucByteCountVerify = ( UCHAR )( usCoilCnt / 8 + 1 );

        }

        else

        {

            ucByteCountVerify = ( UCHAR )( usCoilCnt / 8 );

        }

        if( ( usCoilCnt >= 1 ) &&

            ( usCoilCnt <= MB_PDU_FUNC_WRITE_MUL_COILCNT_MAX ) &&

            ( ucByteCountVerify == ucByteCount ) )

        {

            eRegStatus =

                eMBRegCoilsCB( &pucFrame[MB_PDU_FUNC_WRITE_MUL_VALUES_OFF],

                               usRegAddress, usCoilCnt, MB_REG_WRITE );

            /* If an error occured convert it into a Modbus exception. */

            if( eRegStatus != MB_ENOERR )

            {

                eStatus = prveMBError2Exception( eRegStatus );

            }

            else

            {

                /* The response contains the function code, the starting address

                 * and the quantity of registers. We reuse the old values in the 

                 * buffer because they are still valid. */

                *usLen = MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF;

            }

        }

        else

        {

            eStatus = MB_EX_ILLEGAL_DATA_VALUE;

        }

    }

    else

    {

        /* Can't be a valid write coil register request because the length

         * is incorrect. */

        eStatus = MB_EX_ILLEGAL_DATA_VALUE;

    }

    return eStatus;

}

#endif

#endif

/* 

 * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.

 * Copyright (c) 2006 Christian Walter <wolti@sil.at>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * File: $Id: mbfuncdiag.c,v 1.3 2006/12/07 22:10:34 wolti Exp $

 */

 /*

  * FreeRTOS Modbus Libary: A Modbus serial implementation for FreeRTOS

  * Copyright (C) 2006 Christian Walter <wolti@sil.at>

  *

  * 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 St, Fifth Floor, Boston, MA  02110-1301  USA

  */

/* ----------------------- System includes ----------------------------------*/

#include "stdlib.h"

#include "string.h"

/* ----------------------- Platform includes --------------------------------*/

#include "port.h"

/* ----------------------- Modbus includes ----------------------------------*/

#include "mb.h"

#include "mbframe.h"

#include "mbproto.h"

#include "mbconfig.h"

/* ----------------------- Defines ------------------------------------------*/

#define MB_PDU_FUNC_READ_ADDR_OFF           ( MB_PDU_DATA_OFF )

#define MB_PDU_FUNC_READ_DISCCNT_OFF        ( MB_PDU_DATA_OFF + 2 )

#define MB_PDU_FUNC_READ_SIZE               ( 4 )

#define MB_PDU_FUNC_READ_DISCCNT_MAX        ( 0x07D0 )

/* ----------------------- Static functions ---------------------------------*/

eMBException    prveMBError2Exception( eMBErrorCode eErrorCode );

/* ----------------------- Start implementation -----------------------------*/

#if MB_FUNC_READ_COILS_ENABLED > 0

eMBException

eMBFuncReadDiscreteInputs( UCHAR * pucFrame, USHORT * usLen )

{

    USHORT          usRegAddress;

    USHORT          usDiscreteCnt;

    UCHAR           ucNBytes;

    UCHAR          *pucFrameCur;

    eMBException    eStatus = MB_EX_NONE;

    eMBErrorCode    eRegStatus;

    if( *usLen == ( MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN ) )

    {

        usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 );

        usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] );

        usRegAddress++;

        usDiscreteCnt = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_DISCCNT_OFF] << 8 );

        usDiscreteCnt |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_DISCCNT_OFF + 1] );

        /* Check if the number of registers to read is valid. If not

         * return Modbus illegal data value exception. 

         */

        if( ( usDiscreteCnt >= 1 ) &&

            ( usDiscreteCnt < MB_PDU_FUNC_READ_DISCCNT_MAX ) )

        {

            /* Set the current PDU data pointer to the beginning. */

            pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF];

            *usLen = MB_PDU_FUNC_OFF;

            /* First byte contains the function code. */

            *pucFrameCur++ = MB_FUNC_READ_DISCRETE_INPUTS;

            *usLen += 1;

            /* Test if the quantity of coils is a multiple of 8. If not last

             * byte is only partially field with unused coils set to zero. */

            if( ( usDiscreteCnt & 0x0007 ) != 0 )

            {

                ucNBytes = ( UCHAR ) ( usDiscreteCnt / 8 + 1 );

            }

            else

            {

                ucNBytes = ( UCHAR ) ( usDiscreteCnt / 8 );

            }

            *pucFrameCur++ = ucNBytes;

            *usLen += 1;

            eRegStatus =

                eMBRegDiscreteCB( pucFrameCur, usRegAddress, usDiscreteCnt );

            /* If an error occured convert it into a Modbus exception. */

            if( eRegStatus != MB_ENOERR )

            {

                eStatus = prveMBError2Exception( eRegStatus );

            }

            else

            {

                /* The response contains the function code, the starting address

                 * and the quantity of registers. We reuse the old values in the 

                 * buffer because they are still valid. */

                *usLen += ucNBytes;;

            }

        }

        else

        {

            eStatus = MB_EX_ILLEGAL_DATA_VALUE;

        }

    }

    else

    {

        /* Can't be a valid read coil register request because the length

         * is incorrect. */

        eStatus = MB_EX_ILLEGAL_DATA_VALUE;

    }

    return eStatus;

}

#endif

/* 

 * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.

 * Copyright (c) 2006 Christian Walter <wolti@sil.at>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * File: $Id: mbfuncholding.c,v 1.12 2007/02/18 23:48:22 wolti Exp $

 */

/* ----------------------- System includes ----------------------------------*/

#include "stdlib.h"

#include "string.h"

/* ----------------------- Platform includes --------------------------------*/

#include "port.h"

/* ----------------------- Modbus includes ----------------------------------*/

#include "mb.h"

#include "mbframe.h"

#include "mbproto.h"

#include "mbconfig.h"

/* ----------------------- Defines ------------------------------------------*/

#define MB_PDU_FUNC_READ_ADDR_OFF               ( MB_PDU_DATA_OFF + 0)

#define MB_PDU_FUNC_READ_REGCNT_OFF             ( MB_PDU_DATA_OFF + 2 )

#define MB_PDU_FUNC_READ_SIZE                   ( 4 )

#define MB_PDU_FUNC_READ_REGCNT_MAX             ( 0x007D )

#define MB_PDU_FUNC_WRITE_ADDR_OFF              ( MB_PDU_DATA_OFF + 0)

#define MB_PDU_FUNC_WRITE_VALUE_OFF             ( MB_PDU_DATA_OFF + 2 )

#define MB_PDU_FUNC_WRITE_SIZE                  ( 4 )

#define MB_PDU_FUNC_WRITE_MUL_ADDR_OFF          ( MB_PDU_DATA_OFF + 0 )

#define MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF        ( MB_PDU_DATA_OFF + 2 )

#define MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF       ( MB_PDU_DATA_OFF + 4 )

#define MB_PDU_FUNC_WRITE_MUL_VALUES_OFF        ( MB_PDU_DATA_OFF + 5 )

#define MB_PDU_FUNC_WRITE_MUL_SIZE_MIN          ( 5 )

#define MB_PDU_FUNC_WRITE_MUL_REGCNT_MAX        ( 0x0078 )

#define MB_PDU_FUNC_READWRITE_READ_ADDR_OFF     ( MB_PDU_DATA_OFF + 0 )

#define MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF   ( MB_PDU_DATA_OFF + 2 )

#define MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF    ( MB_PDU_DATA_OFF + 4 )

#define MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF  ( MB_PDU_DATA_OFF + 6 )

#define MB_PDU_FUNC_READWRITE_BYTECNT_OFF       ( MB_PDU_DATA_OFF + 8 )

#define MB_PDU_FUNC_READWRITE_WRITE_VALUES_OFF  ( MB_PDU_DATA_OFF + 9 )

#define MB_PDU_FUNC_READWRITE_SIZE_MIN          ( 9 )

/* ----------------------- Static functions ---------------------------------*/

eMBException    prveMBError2Exception( eMBErrorCode eErrorCode );

/* ----------------------- Start implementation -----------------------------*/

#if MB_FUNC_WRITE_HOLDING_ENABLED > 0

eMBException

eMBFuncWriteHoldingRegister( UCHAR * pucFrame, USHORT * usLen )

{

    USHORT          usRegAddress;

    eMBException    eStatus = MB_EX_NONE;

    eMBErrorCode    eRegStatus;

    if( *usLen == ( MB_PDU_FUNC_WRITE_SIZE + MB_PDU_SIZE_MIN ) )

    {

        usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF] << 8 );

        usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF + 1] );

        usRegAddress++;

        /* Make callback to update the value. */

        eRegStatus = eMBRegHoldingCB( &pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF],

                                      usRegAddress, 1, MB_REG_WRITE );

        /* If an error occured convert it into a Modbus exception. */

        if( eRegStatus != MB_ENOERR )

        {

            eStatus = prveMBError2Exception( eRegStatus );

        }

    }

    else

    {

        /* Can't be a valid request because the length is incorrect. */

        eStatus = MB_EX_ILLEGAL_DATA_VALUE;

    }

    return eStatus;

}

#endif

#if MB_FUNC_WRITE_MULTIPLE_HOLDING_ENABLED > 0

eMBException

eMBFuncWriteMultipleHoldingRegister( UCHAR * pucFrame, USHORT * usLen )

{

    USHORT          usRegAddress;

    USHORT          usRegCount;

    UCHAR           ucRegByteCount;

    eMBException    eStatus = MB_EX_NONE;

    eMBErrorCode    eRegStatus;

    if( *usLen >= ( MB_PDU_FUNC_WRITE_MUL_SIZE_MIN + MB_PDU_SIZE_MIN ) )

    {

        usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF] << 8 );

        usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF + 1] );

        usRegAddress++;

        usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF] << 8 );

        usRegCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF + 1] );

        ucRegByteCount = pucFrame[MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF];

        if( ( usRegCount >= 1 ) &&

            ( usRegCount <= MB_PDU_FUNC_WRITE_MUL_REGCNT_MAX ) &&

            ( ucRegByteCount == ( UCHAR ) ( 2 * usRegCount ) ) )

        {

            /* Make callback to update the register values. */

            eRegStatus =

                eMBRegHoldingCB( &pucFrame[MB_PDU_FUNC_WRITE_MUL_VALUES_OFF],

                                 usRegAddress, usRegCount, MB_REG_WRITE );

            /* If an error occured convert it into a Modbus exception. */

            if( eRegStatus != MB_ENOERR )

            {

                eStatus = prveMBError2Exception( eRegStatus );

            }

            else

            {

                /* The response contains the function code, the starting

                 * address and the quantity of registers. We reuse the

                 * old values in the buffer because they are still valid.

                 */

                *usLen = MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF;

            }

        }

        else

        {

            eStatus = MB_EX_ILLEGAL_DATA_VALUE;

        }

    }

    else

    {

        /* Can't be a valid request because the length is incorrect. */

        eStatus = MB_EX_ILLEGAL_DATA_VALUE;

    }

    return eStatus;

}

#endif

#if MB_FUNC_READ_HOLDING_ENABLED > 0

eMBException

eMBFuncReadHoldingRegister( UCHAR * pucFrame, USHORT * usLen )

{

    USHORT          usRegAddress;

    USHORT          usRegCount;

    UCHAR          *pucFrameCur;

    eMBException    eStatus = MB_EX_NONE;

    eMBErrorCode    eRegStatus;

    if( *usLen == ( MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN ) )

    {

        usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 );

        usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] );

        usRegAddress++;

        usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF] << 8 );

        usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF + 1] );

        /* Check if the number of registers to read is valid. If not

         * return Modbus illegal data value exception. 

         */

        if( ( usRegCount >= 1 ) && ( usRegCount <= MB_PDU_FUNC_READ_REGCNT_MAX ) )

        {

            /* Set the current PDU data pointer to the beginning. */

            pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF];

            *usLen = MB_PDU_FUNC_OFF;

            /* First byte contains the function code. */

            *pucFrameCur++ = MB_FUNC_READ_HOLDING_REGISTER;

            *usLen += 1;

            /* Second byte in the response contain the number of bytes. */

            *pucFrameCur++ = ( UCHAR ) ( usRegCount * 2 );

            *usLen += 1;

            /* Make callback to fill the buffer. */

            eRegStatus = eMBRegHoldingCB( pucFrameCur, usRegAddress, usRegCount, MB_REG_READ );

            /* If an error occured convert it into a Modbus exception. */

            if( eRegStatus != MB_ENOERR )

            {

                eStatus = prveMBError2Exception( eRegStatus );

            }

            else

            {

                *usLen += usRegCount * 2;

            }

        }

        else

        {

            eStatus = MB_EX_ILLEGAL_DATA_VALUE;

        }

    }

    else

    {

        /* Can't be a valid request because the length is incorrect. */

        eStatus = MB_EX_ILLEGAL_DATA_VALUE;

    }

    return eStatus;

}

#endif

#if MB_FUNC_READWRITE_HOLDING_ENABLED > 0

eMBException

eMBFuncReadWriteMultipleHoldingRegister( UCHAR * pucFrame, USHORT * usLen )

{

    USHORT          usRegReadAddress;

    USHORT          usRegReadCount;

    USHORT          usRegWriteAddress;

    USHORT          usRegWriteCount;

    UCHAR           ucRegWriteByteCount;

    UCHAR          *pucFrameCur;

    eMBException    eStatus = MB_EX_NONE;

    eMBErrorCode    eRegStatus;

    if( *usLen >= ( MB_PDU_FUNC_READWRITE_SIZE_MIN + MB_PDU_SIZE_MIN ) )

    {

        usRegReadAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_READ_ADDR_OFF] << 8U );

        usRegReadAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_READ_ADDR_OFF + 1] );

        usRegReadAddress++;

        usRegReadCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF] << 8U );

        usRegReadCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF + 1] );

        usRegWriteAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF] << 8U );

        usRegWriteAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF + 1] );

        usRegWriteAddress++;

        usRegWriteCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF] << 8U );

        usRegWriteCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF + 1] );

        ucRegWriteByteCount = pucFrame[MB_PDU_FUNC_READWRITE_BYTECNT_OFF];

        if( ( usRegReadCount >= 1 ) && ( usRegReadCount <= 0x7D ) &&

            ( usRegWriteCount >= 1 ) && ( usRegWriteCount <= 0x79 ) &&

            ( ( 2 * usRegWriteCount ) == ucRegWriteByteCount ) )

        {

            /* Make callback to update the register values. */

            eRegStatus = eMBRegHoldingCB( &pucFrame[MB_PDU_FUNC_READWRITE_WRITE_VALUES_OFF],

                                          usRegWriteAddress, usRegWriteCount, MB_REG_WRITE );

            if( eRegStatus == MB_ENOERR )

            {

                /* Set the current PDU data pointer to the beginning. */

                pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF];

                *usLen = MB_PDU_FUNC_OFF;

                /* First byte contains the function code. */

                *pucFrameCur++ = MB_FUNC_READWRITE_MULTIPLE_REGISTERS;

                *usLen += 1;

                /* Second byte in the response contain the number of bytes. */

                *pucFrameCur++ = ( UCHAR ) ( usRegReadCount * 2 );

                *usLen += 1;

                /* Make the read callback. */

                eRegStatus =

                    eMBRegHoldingCB( pucFrameCur, usRegReadAddress, usRegReadCount, MB_REG_READ );

                if( eRegStatus == MB_ENOERR )

                {

                    *usLen += 2 * usRegReadCount;

                }

            }

            if( eRegStatus != MB_ENOERR )

            {

                eStatus = prveMBError2Exception( eRegStatus );

            }

        }

        else

        {

            eStatus = MB_EX_ILLEGAL_DATA_VALUE;

        }

    }

    return eStatus;

}

#endif

/* 

 * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.

 * Copyright (c) 2006 Christian Walter <wolti@sil.at>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * File: $Id: mbfuncinput.c,v 1.10 2007/09/12 10:15:56 wolti Exp $

 */

/* ----------------------- System includes ----------------------------------*/

#include "stdlib.h"

#include "string.h"

/* ----------------------- Platform includes --------------------------------*/

#include "port.h"

/* ----------------------- Modbus includes ----------------------------------*/

#include "mb.h"

#include "mbframe.h"

#include "mbproto.h"

#include "mbconfig.h"

/* ----------------------- Defines ------------------------------------------*/

#define MB_PDU_FUNC_READ_ADDR_OFF           ( MB_PDU_DATA_OFF )

#define MB_PDU_FUNC_READ_REGCNT_OFF         ( MB_PDU_DATA_OFF + 2 )

#define MB_PDU_FUNC_READ_SIZE               ( 4 )

#define MB_PDU_FUNC_READ_REGCNT_MAX         ( 0x007D )

#define MB_PDU_FUNC_READ_RSP_BYTECNT_OFF    ( MB_PDU_DATA_OFF )

/* ----------------------- Static functions ---------------------------------*/

eMBException    prveMBError2Exception( eMBErrorCode eErrorCode );

/* ----------------------- Start implementation -----------------------------*/

#if MB_FUNC_READ_INPUT_ENABLED > 0

eMBException

eMBFuncReadInputRegister( UCHAR * pucFrame, USHORT * usLen )

{

    USHORT          usRegAddress;

    USHORT          usRegCount;

    UCHAR          *pucFrameCur;

    eMBException    eStatus = MB_EX_NONE;

    eMBErrorCode    eRegStatus;

    if( *usLen == ( MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN ) )

    {

        usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 );

        usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] );

        usRegAddress++;

        usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF] << 8 );

        usRegCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF + 1] );

        /* Check if the number of registers to read is valid. If not

         * return Modbus illegal data value exception. 

         */

        if( ( usRegCount >= 1 )

            && ( usRegCount < MB_PDU_FUNC_READ_REGCNT_MAX ) )

        {

            /* Set the current PDU data pointer to the beginning. */

            pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF];

            *usLen = MB_PDU_FUNC_OFF;

            /* First byte contains the function code. */

            *pucFrameCur++ = MB_FUNC_READ_INPUT_REGISTER;

            *usLen += 1;

            /* Second byte in the response contain the number of bytes. */

            *pucFrameCur++ = ( UCHAR )( usRegCount * 2 );

            *usLen += 1;

            eRegStatus =

                eMBRegInputCB( pucFrameCur, usRegAddress, usRegCount );

            /* If an error occured convert it into a Modbus exception. */

            if( eRegStatus != MB_ENOERR )

            {

                eStatus = prveMBError2Exception( eRegStatus );

            }

            else

            {

                *usLen += usRegCount * 2;

            }

        }

        else

        {

            eStatus = MB_EX_ILLEGAL_DATA_VALUE;

        }

    }

    else

    {

        /* Can't be a valid read input register request because the length

         * is incorrect. */

        eStatus = MB_EX_ILLEGAL_DATA_VALUE;

    }

    return eStatus;

}

#endif

/* 

 * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.

 * Copyright (c) 2006 Christian Walter <wolti@sil.at>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without