File content as of revision 0:f54e9507171b:

/*
 * FreeModbus Libary: BARE Demo Application
 * Copyright (C) 2006 Christian Walter <wolti@sil.at>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * File: $Id: demo.c,v 1.1 2006/08/22 21:35:13 wolti Exp $

* modified from: Thanassis Mavrogeorgiadis 5-12-2011
 */

#include "mbed.h"

/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbport.h"
#include "mbconfig.h"


#if MB_TCP_ENABLED == 1
#include "EthernetNetIf.h"
EthernetNetIf eth;  
#endif

extern Serial pc;

DigitalOut led1(LED1);

DigitalIn ENET_LINK(P1_25);
DigitalOut LedLINK(LED4);
Ticker EtherPinMonitor;

#if MB_TCP_ENABLED == 1
void EtherPinMonitorFunc(void)
{
  LedLINK = !ENET_LINK; 
}
#endif

/* ----------------------- Defines ------------------------------------------*/
#define REG_INPUT_START 1000
#define REG_INPUT_NREGS 4
#define REG_HOLDING_START       2000
#define REG_HOLDING_NREGS       130

#define SLAVE_ID 0x0A

/* ----------------------- Static variables ---------------------------------*/
static USHORT   usRegInputStart = REG_INPUT_START;
static USHORT   usRegInputBuf[REG_INPUT_NREGS];
static USHORT   usRegHoldingStart = REG_HOLDING_START;
static USHORT   usRegHoldingBuf[REG_HOLDING_NREGS];

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


int main() {
  eMBErrorCode    eStatus;

#if MB_TCP_ENABLED == 1
  pc.baud(115200);
  EtherPinMonitor.attach(&EtherPinMonitorFunc, 0.01);
  printf("Setting up...\n");
  EthernetErr ethErr = eth.setup();
  if(ethErr)
  {
    printf("Error %d in setup.\n", ethErr);
    return -1;
  }
  printf("Setup OK\n");
#endif
   
  Timer tm;
  tm.start();

#if MB_RTU_ENABLED == 1
    eStatus = eMBInit( MB_RTU, SLAVE_ID, 0, 9600, MB_PAR_NONE );
#endif
#if MB_ASCII_ENABLED == 1
    eStatus = eMBInit( MB_ASCII, SLAVE_ID, 0, 9600, MB_PAR_NONE );
#endif
#if MB_TCP_ENABLED == 1
    eStatus = eMBTCPInit( MB_TCP_PORT_USE_DEFAULT );
#endif
    if (eStatus != MB_ENOERR )
      printf( "can't initialize modbus stack!\r\n" );

    /* Enable the Modbus Protocol Stack. */
    eStatus = eMBEnable(  );
    if (eStatus != MB_ENOERR )
      fprintf( stderr, "can't enable modbus stack!\r\n" );

  // Initialise some registers
  usRegInputBuf[1] = 0x1234;
  usRegInputBuf[2] = 0x5678;
  usRegInputBuf[3] = 0x9abc;        

  while(true)
  {
#if MB_TCP_ENABLED == 1
    Net::poll();
#endif
    if(tm.read()>.5)
    {
      led1=!led1; //Show that we are alive
      tm.start();
    }

    eStatus = eMBPoll(  );
            
    /* Here we simply count the number of poll cycles. */
    usRegInputBuf[0]++;
  }
  return 0;
}

eMBErrorCode
eMBRegInputCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNRegs )
{
    eMBErrorCode    eStatus = MB_ENOERR;
    int             iRegIndex;

    if( ( usAddress >= REG_INPUT_START )
        && ( usAddress + usNRegs <= REG_INPUT_START + REG_INPUT_NREGS ) )
    {
        iRegIndex = ( int )( usAddress - usRegInputStart );
        while( usNRegs > 0 )
        {
            *pucRegBuffer++ = ( unsigned char )( usRegInputBuf[iRegIndex] >> 8 );
            *pucRegBuffer++ = ( unsigned char )( usRegInputBuf[iRegIndex] & 0xFF );
            iRegIndex++;
            usNRegs--;
        }
    }
    else
    {
        eStatus = MB_ENOREG;
    }
    return eStatus;
}

eMBErrorCode
eMBRegHoldingCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNRegs, eMBRegisterMode eMode )
{
    eMBErrorCode    eStatus = MB_ENOERR;
    int             iRegIndex;

    if( ( usAddress >= REG_HOLDING_START ) &&
        ( usAddress + usNRegs <= REG_HOLDING_START + REG_HOLDING_NREGS ) )
    {
        iRegIndex = ( int )( usAddress - usRegHoldingStart );
        switch ( eMode )
        {
            /* Pass current register values to the protocol stack. */
        case MB_REG_READ:
            while( usNRegs > 0 )
            {
                *pucRegBuffer++ = ( UCHAR ) ( usRegHoldingBuf[iRegIndex] >> 8 );
                *pucRegBuffer++ = ( UCHAR ) ( usRegHoldingBuf[iRegIndex] & 0xFF );
                iRegIndex++;
                usNRegs--;
            }
            break;

            /* Update current register values with new values from the
             * protocol stack. */
        case MB_REG_WRITE:
            while( usNRegs > 0 )
            {
                usRegHoldingBuf[iRegIndex] = *pucRegBuffer++ << 8;
                usRegHoldingBuf[iRegIndex] |= *pucRegBuffer++;
                iRegIndex++;
                usNRegs--;
            }
        }
    }
    else
    {
        eStatus = MB_ENOREG;
    }
    return eStatus;
}

eMBErrorCode
eMBRegCoilsCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNCoils, eMBRegisterMode eMode )
{
    return MB_ENOREG;
}

eMBErrorCode
eMBRegDiscreteCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNDiscrete )
{
    return MB_ENOREG;
}