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