root / freemodbus / port / portserial.c @ 20e5429c
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/*
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* FreeModbus Libary: ATMega168 Port
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* Copyright (C) 2006 Christian Walter <wolti@sil.at>
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* - Initial version and ATmega168 support
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* Modfications Copyright (C) 2006 Tran Minh Hoang:
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* - ATmega8, ATmega16, ATmega32 support
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* - RS485 support for DS75176
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; 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: portserial.c,v 1.6 2006/09/17 16:45:53 wolti Exp $
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*/
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#include <avr/io.h> |
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#include <avr/interrupt.h> |
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#include <avr/signal.h> |
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#include "port.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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#define UART_BAUD_RATE 9600 |
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#define UART_BAUD_CALC(UART_BAUD_RATE,F_OSC) \
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( ( F_OSC ) / ( ( UART_BAUD_RATE ) * 16UL ) - 1 ) |
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//#define UART_UCSRB UCSR0B
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void
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vMBPortSerialEnable( BOOL xRxEnable, BOOL xTxEnable ) |
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{ |
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#ifdef RTS_ENABLE
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UCSRB |= _BV( TXEN ) | _BV(TXCIE); |
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#else
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UCSRB |= _BV( TXEN ); |
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#endif
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if( xRxEnable )
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{ |
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UCSRB |= _BV( RXEN ) | _BV( RXCIE ); |
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} |
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else
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{ |
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UCSRB &= ~( _BV( RXEN ) | _BV( RXCIE ) ); |
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} |
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if( xTxEnable )
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{ |
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UCSRB |= _BV( TXEN ) | _BV( UDRE ); |
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#ifdef RTS_ENABLE
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RTS_HIGH; |
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#endif
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} |
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else
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{ |
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UCSRB &= ~( _BV( UDRE ) ); |
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} |
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} |
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BOOL |
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xMBPortSerialInit( UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits, eMBParity eParity ) |
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{ |
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UCHAR ucUCSRC = 0;
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/* prevent compiler warning. */
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(void)ucPORT;
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UBRR = UART_BAUD_CALC( ulBaudRate, F_CPU ); |
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switch ( eParity )
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{ |
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case MB_PAR_EVEN:
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ucUCSRC |= _BV( UPM1 ); |
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break;
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case MB_PAR_ODD:
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ucUCSRC |= _BV( UPM1 ) | _BV( UPM0 ); |
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break;
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case MB_PAR_NONE:
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break;
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} |
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switch ( ucDataBits )
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{ |
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case 8: |
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ucUCSRC |= _BV( UCSZ0 ) | _BV( UCSZ1 ); |
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break;
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case 7: |
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ucUCSRC |= _BV( UCSZ1 ); |
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break;
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} |
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#if defined (__AVR_ATmega168__)
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UCSRC |= ucUCSRC; |
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#elif defined (__AVR_ATmega169__)
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UCSRC |= ucUCSRC; |
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#elif defined (__AVR_ATmega8__)
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UCSRC = _BV( URSEL ) | ucUCSRC; |
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#elif defined (__AVR_ATmega16__)
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UCSRC = _BV( URSEL ) | ucUCSRC; |
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#elif defined (__AVR_ATmega32__)
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UCSRC = _BV( URSEL ) | ucUCSRC; |
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#elif defined (__AVR_ATmega128__)
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UCSRC |= ucUCSRC; |
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#endif
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vMBPortSerialEnable( FALSE, FALSE ); |
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#ifdef RTS_ENABLE
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RTS_INIT; |
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#endif
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return TRUE;
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} |
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BOOL |
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xMBPortSerialPutByte( CHAR ucByte ) |
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{ |
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UDR = ucByte; |
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return TRUE;
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} |
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BOOL |
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xMBPortSerialGetByte( CHAR * pucByte ) |
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{ |
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*pucByte = UDR; |
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return TRUE;
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} |
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SIGNAL( SIG_USART_DATA ) |
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{ |
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pxMBFrameCBTransmitterEmpty( ); |
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} |
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SIGNAL( SIG_USART_RECV ) |
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{ |
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pxMBFrameCBByteReceived( ); |
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} |
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#ifdef RTS_ENABLE
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SIGNAL( SIG_UART_TRANS ) |
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{ |
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RTS_LOW; |
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} |
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#endif
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