USB device stack, fixes for USBSerial, lightweight without malloc (RTOS ready)
Fork of USBDevice by
USBSerial/CircBuffer.h
- Committer:
- alpov
- Date:
- 2014-07-30
- Revision:
- 26:419386cf801c
- Parent:
- 14:d495202c90f4
File content as of revision 26:419386cf801c:
/* 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)); }; ~CircBuffer() { free(buf); } 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