USBDevice compatible with frdmk22f-usbhid-4axis
Dependents: frdmk22f-usbhid-4axis
USBSerial/CircBuffer.h
- Committer:
- mbed_official
- Date:
- 2015-06-08
- Revision:
- 56:151ba33713ff
- Parent:
- 51:deafa44182d9
File content as of revision 56:151ba33713ff:
/* 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, int Size> class CircBuffer { public: CircBuffer():write(0), read(0){} 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; static const int size = Size+1; //a modern optimizer should be able to remove this so it uses no ram. T buf[Size+1]; }; #endif