159 lines
4.6 KiB
C
159 lines
4.6 KiB
C
/*
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* FreeModbus Libary: MSP430 Demo Application
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* Copyright (C) 2006 Christian Walter <wolti@sil.at>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* File: $Id$
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*/
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/* ----------------------- Platform includes --------------------------------*/
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#include "port.h"
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#include "dco.h"
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/* ----------------------- Modbus includes ----------------------------------*/
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#include "mb.h"
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#include "mbport.h"
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/* ----------------------- Defines ------------------------------------------*/
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#define REG_INPUT_START 1000
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#define REG_INPUT_NREGS 4
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#define REG_HOLDING_START 1000
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#define REG_HOLDING_NREGS 130
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/* ----------------------- Static variables ---------------------------------*/
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static USHORT usRegInputStart = REG_INPUT_START;
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static USHORT usRegInputBuf[REG_INPUT_NREGS];
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static USHORT usRegHoldingStart = REG_HOLDING_START;
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static USHORT usRegHoldingBuf[REG_HOLDING_NREGS];
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/* ----------------------- Start implementation -----------------------------*/
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int
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main( void )
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{
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eMBErrorCode eStatus;
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volatile USHORT usACLKCnt;
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/* Stop Watchdog Timer. */
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WDTCTL = WDTPW + WDTHOLD;
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/* Delay for ACLK startup. */
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for( usACLKCnt = 0xFFFF; usACLKCnt != 0; usACLKCnt-- );
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if( cTISetDCO( TI_DCO_4MHZ ) == TI_DCO_NO_ERROR )
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{
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_EINT( );
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/* Initialize Protocol Stack. */
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if( ( eStatus = eMBInit( MB_RTU, 0x0A, 0, 38400, MB_PAR_EVEN ) ) != MB_ENOERR )
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{
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}
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/* Enable the Modbus Protocol Stack. */
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else if( ( eStatus = eMBEnable( ) ) != MB_ENOERR )
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{
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}
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else
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{
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for( ;; )
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{
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( void )eMBPoll( );
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/* Here we simply count the number of poll cycles. */
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usRegInputBuf[0]++;
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}
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}
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}
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for( ;; );
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}
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eMBErrorCode
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eMBRegInputCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNRegs )
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{
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eMBErrorCode eStatus = MB_ENOERR;
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int iRegIndex;
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if( ( usAddress >= REG_INPUT_START )
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&& ( usAddress + usNRegs <= REG_INPUT_START + REG_INPUT_NREGS ) )
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{
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iRegIndex = ( int )( usAddress - usRegInputStart );
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while( usNRegs > 0 )
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{
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*pucRegBuffer++ = ( unsigned char )( usRegInputBuf[iRegIndex] >> 8 );
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*pucRegBuffer++ = ( unsigned char )( usRegInputBuf[iRegIndex] & 0xFF );
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iRegIndex++;
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usNRegs--;
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}
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}
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else
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{
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eStatus = MB_ENOREG;
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}
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return eStatus;
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}
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eMBErrorCode
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eMBRegHoldingCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNRegs, eMBRegisterMode eMode )
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{
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eMBErrorCode eStatus = MB_ENOERR;
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int iRegIndex;
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if( ( usAddress >= REG_HOLDING_START ) &&
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( usAddress + usNRegs <= REG_HOLDING_START + REG_HOLDING_NREGS ) )
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{
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iRegIndex = ( int )( usAddress - usRegHoldingStart );
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switch ( eMode )
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{
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/* Pass current register values to the protocol stack. */
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case MB_REG_READ:
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while( usNRegs > 0 )
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{
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*pucRegBuffer++ = ( unsigned char )( usRegHoldingBuf[iRegIndex] >> 8 );
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*pucRegBuffer++ = ( unsigned char )( usRegHoldingBuf[iRegIndex] & 0xFF );
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iRegIndex++;
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usNRegs--;
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}
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break;
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/* Update current register values with new values from the
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* protocol stack. */
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case MB_REG_WRITE:
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while( usNRegs > 0 )
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{
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usRegHoldingBuf[iRegIndex] = *pucRegBuffer++ << 8;
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usRegHoldingBuf[iRegIndex] |= *pucRegBuffer++;
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iRegIndex++;
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usNRegs--;
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}
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}
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}
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else
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{
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eStatus = MB_ENOREG;
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}
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return eStatus;
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}
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eMBErrorCode
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eMBRegCoilsCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNCoils, eMBRegisterMode eMode )
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{
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return MB_ENOREG;
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}
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eMBErrorCode
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eMBRegDiscreteCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNDiscrete )
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{
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return MB_ENOREG;
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}
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