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44 lines
1.4 KiB
C++
44 lines
1.4 KiB
C++
/*
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Copyright (c) 2011 Arduino. All right reserved.
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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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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.
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See the GNU Lesser General Public License for more details.
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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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#include "RingBuffer.h"
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#include <string.h>
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RingBuffer::RingBuffer( void )
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{
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memset( (void *)_aucBuffer, 0, SERIAL_BUFFER_SIZE ) ;
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_iHead=0 ;
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_iTail=0 ;
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}
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void RingBuffer::store_char( uint8_t c )
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{
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int i = (uint32_t)(_iHead + 1) % SERIAL_BUFFER_SIZE ;
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// if we should be storing the received character into the location
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// just before the tail (meaning that the head would advance to the
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// current location of the tail), we're about to overflow the buffer
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// and so we don't write the character or advance the head.
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if ( i != _iTail )
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{
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_aucBuffer[_iHead] = c ;
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_iHead = i ;
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}
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}
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