FreeModbus: STR71X/simple2.c

/*
 * FreeModbus Libary: STR71x 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: $Id$
 */

/* ----------------------- System includes ----------------------------------*/
#include "assert.h"

/* ----------------------- Platform includes --------------------------------*/
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"

/* ----------------------- STR71X includes ----------------------------------*/
#include "eic.h"

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

/* ----------------------- Defines ------------------------------------------*/
#define REG_INPUT_START 1000
#define REG_INPUT_NREGS 4

/* ----------------------- Static variables ---------------------------------*/
static unsigned short usRegInputStart = REG_INPUT_START;
static unsigned short usRegInputBuf[REG_INPUT_NREGS];

/* ----------------------- Static functions ---------------------------------*/
static void     vModbusTask( void *pvParameters );

/* ----------------------- Start implementation -----------------------------*/
int
main( void )
{
    EIC_Init(  );
    EIC_IRQConfig( ENABLE );

    ( void )xTaskCreate( vModbusTask, NULL, configMINIMAL_STACK_SIZE, NULL,
                         tskIDLE_PRIORITY, NULL );

    vTaskStartScheduler(  );
    return 0;
}

static void
vModbusTask( void *pvParameters )
{
    portTickType    xLastWakeTime;

    /* Select either ASCII or RTU Mode. */
    ( void )eMBInit( MB_RTU, 0x0A, 38400, MB_PAR_EVEN );

    /* Enable the Modbus Protocol Stack. */
    ( void )eMBEnable(  );
    for( ;; )
    {
        /* Call the main polling loop of the Modbus protocol stack. */
        ( void )eMBPoll(  );
        /* Application specific actions. Count the number of poll cycles. */
        usRegInputBuf[0]++;
        /* Hold the current FreeRTOS ticks. */
        xLastWakeTime = xTaskGetTickCount(  );
        usRegInputBuf[1] = ( unsigned portSHORT )( xLastWakeTime >> 16UL );
        usRegInputBuf[2] = ( unsigned portSHORT )( xLastWakeTime & 0xFFFFUL );
        /* The constant value. */
        usRegInputBuf[3] = 33;
    }
}

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 )
{
    return MB_ENOREG;
}


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

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

void
__assert( const char *pcFile, const char *pcLine, int iLineNumber )
{
    portENTER_CRITICAL(  );
    for( ;; );
}