Skip to content
Permalink
Branch: master
Find file Copy path
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
118 lines (103 sloc) 3.57 KB
/*
* FreeModbus Libary: AVR 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: $Id$
*/
/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbutils.h"
/* ----------------------- Defines ------------------------------------------*/
#define REG_COILS_START 1000
#define REG_COILS_SIZE 16
/* ----------------------- Static variables ---------------------------------*/
static unsigned char ucRegCoilsBuf[REG_COILS_SIZE / 8];
/* ----------------------- Start implementation -----------------------------*/
int
main( void )
{
/* Select either ASCII or RTU Mode. */
( void )eMBInit( MB_RTU, 0x0A, 0, 9600, MB_PAR_EVEN );
/* Enable the Modbus Protocol Stack. */
( void )eMBEnable( );
for( ;; )
{
/* Call the main polling loop of the Modbus protocol stack. */
( void )eMBPoll( );
}
}
eMBErrorCode
eMBRegCoilsCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNCoils,
eMBRegisterMode eMode )
{
eMBErrorCode eStatus = MB_ENOERR;
short iNCoils = ( short )usNCoils;
unsigned short usBitOffset;
/* Check if we have registers mapped at this block. */
if( ( usAddress >= REG_COILS_START ) &&
( usAddress + usNCoils <= REG_COILS_START + REG_COILS_SIZE ) )
{
usBitOffset = ( unsigned short )( usAddress - REG_COILS_START );
switch ( eMode )
{
/* Read current values and pass to protocol stack. */
case MB_REG_READ:
while( iNCoils > 0 )
{
*pucRegBuffer++ =
xMBUtilGetBits( ucRegCoilsBuf, usBitOffset,
( unsigned char )( iNCoils >
8 ? 8 :
iNCoils ) );
iNCoils -= 8;
usBitOffset += 8;
}
break;
/* Update current register values. */
case MB_REG_WRITE:
while( iNCoils > 0 )
{
xMBUtilSetBits( ucRegCoilsBuf, usBitOffset,
( unsigned char )( iNCoils > 8 ? 8 : iNCoils ),
*pucRegBuffer++ );
iNCoils -= 8;
}
break;
}
}
else
{
eStatus = MB_ENOREG;
}
return eStatus;
}
eMBErrorCode
eMBRegInputCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNRegs )
{
return MB_ENOREG;
}
eMBErrorCode
eMBRegHoldingCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNRegs,
eMBRegisterMode eMode )
{
return MB_ENOREG;
}
eMBErrorCode
eMBRegDiscreteCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNDiscrete )
{
return MB_ENOREG;
}
You can’t perform that action at this time.