USB device stack - modified
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Diff: USBSerial/CircBuffer.h
- Revision:
- 12:a9671b78d24e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/USBSerial/CircBuffer.h Mon Jul 22 21:16:27 2013 +0000 @@ -0,0 +1,82 @@ +/* Copyright (c) 2010-2011 mbed.org, MIT License +* +* Permission is hereby granted, free of charge, to any person obtaining a copy of this software +* and associated documentation files (the "Software"), to deal in the Software without +* restriction, including without limitation the rights to use, copy, modify, merge, publish, +* distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the +* Software is furnished to do so, subject to the following conditions: +* +* The above copyright notice and this permission notice shall be included in all copies or +* substantial portions of the Software. +* +* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING +* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +*/ + +#ifndef CIRCBUFFER_H +#define CIRCBUFFER_H + +template <class T> +class CircBuffer +{ +public: + CircBuffer( int length ) + { + write = 0; + read = 0; + size = length + 1; + buf = ( T * )malloc( size * sizeof( T ) ); + }; + + bool isFull() + { + return ( ( write + 1 ) % size == read ); + }; + + bool isEmpty() + { + return ( read == write ); + }; + + void queue( T k ) + { + if ( isFull() ) + { + read++; + read %= size; + } + + buf[write++] = k; + write %= size; + } + + uint16_t available() + { + return ( write >= read ) ? write - read : size - read + write; + }; + + bool dequeue( T *c ) + { + bool empty = isEmpty(); + + if ( !empty ) + { + *c = buf[read++]; + read %= size; + } + + return( !empty ); + }; + +private: + volatile uint16_t write; + volatile uint16_t read; + uint16_t size; + T *buf; +}; + +#endif +