Tooltron

/*

 * FreeModbus Libary: ATMega168 Port

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

 *   - Initial version and ATmega168 support

 * Modfications Copyright (C) 2006 Tran Minh Hoang:

 *   - ATmega8, ATmega16, ATmega32 support

 *   - RS485 support for DS75176

 *

 * 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

 *

 * File: $Id: portserial.c,v 1.6 2006/09/17 16:45:53 wolti Exp $

 */

#include <avr/io.h>

#include <avr/interrupt.h>

#include "port.h"

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

#include "mb.h"

#include "mbport.h"

#ifdef __AVR_ATtiny1634__

#define UART_BAUD_CALC(UART_BAUD_RATE,F_OSC) \

    ( ( F_OSC ) / ( ( UART_BAUD_RATE ) * 8UL ) - 1 )

#else

#define UART_BAUD_CALC(UART_BAUD_RATE,F_OSC) \

    ( ( F_OSC ) / ( ( UART_BAUD_RATE ) * 16UL ) - 1 )

#endif

void

vMBPortSerialEnable( BOOL xRxEnable, BOOL xTxEnable )

{

#ifdef RTS_ENABLE

    UCSRB |= _BV( TXEN ) | _BV(TXCIE);

#else

    UCSRB |= _BV( TXEN );

#endif

    if( xRxEnable )

    {

        UCSRB |= _BV( RXEN ) | _BV( RXCIE );

    }

    else

    {

        UCSRB &= ~( _BV( RXEN ) | _BV( RXCIE ) );

    }

    if( xTxEnable )

    {

        UCSRB |= _BV( TXEN ) | _BV( UDRE );

#ifdef RTS_ENABLE

        RTS_HIGH;

#endif

    }

    else

    {

        UCSRB &= ~( _BV( UDRE ) );

    }

}

BOOL

xMBPortSerialInit( UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits, eMBParity eParity )

{

    UCHAR ucUCSRC = 0;

    /* prevent compiler warning. */

    (void)ucPORT;

    UBRR = UART_BAUD_CALC( ulBaudRate, F_CPU );

    switch ( eParity )

    {

        case MB_PAR_EVEN:

            ucUCSRC |= _BV( UPM1 );

            break;

        case MB_PAR_ODD:

            ucUCSRC |= _BV( UPM1 ) | _BV( UPM0 );

            break;

        case MB_PAR_NONE:

            break;

    }

    switch ( ucDataBits )

    {

        case 8:

            ucUCSRC |= _BV( UCSZ0 ) | _BV( UCSZ1 );

            break;

        case 7:

            ucUCSRC |= _BV( UCSZ1 );

            break;

    }

#if defined (__AVR_ATmega168__)

    UCSRC |= ucUCSRC;

#elif defined (__AVR_ATmega169__)

    UCSRC |= ucUCSRC;

#elif defined (__AVR_ATmega8__)

    UCSRC = _BV( URSEL ) | ucUCSRC;

#elif defined (__AVR_ATmega16__)

    UCSRC = _BV( URSEL ) | ucUCSRC;

#elif defined (__AVR_ATmega32__)

    UCSRC = _BV( URSEL ) | ucUCSRC;

#elif defined (__AVR_ATmega128__)

    UCSRC |= ucUCSRC;

#elif defined (__AVR_ATtiny1634__)

    UCSRA |= _BV(U2X);

    UCSRC |= ucUCSRC;

#endif

    vMBPortSerialEnable( FALSE, FALSE );

#ifdef RTS_ENABLE

    RTS_INIT;

#endif

    return TRUE;

}

BOOL

xMBPortSerialPutByte( CHAR ucByte )

{

    UDR = ucByte;

    return TRUE;

}

BOOL

xMBPortSerialGetByte( CHAR * pucByte )

{

    *pucByte = UDR;

    return TRUE;

}

SIGNAL( SIG_USART_DATA )

{

    pxMBFrameCBTransmitterEmpty(  );

}

SIGNAL( SIG_USART_RECV )

{

    pxMBFrameCBByteReceived(  );

}

#ifdef RTS_ENABLE

SIGNAL( SIG_UART_TRANS )

{

    RTS_LOW;

}

#endif