test public
Dependencies: HttpServer_snapshot_mbed-os
CircBufferHostSerial.h
00001 /* mbed USBHost Library 00002 * Copyright (c) 2006-2013 ARM Limited 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http://www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 00017 #ifndef CIRCBUFFERHOSTSERIAL_H 00018 #define CIRCBUFFERHOSTSERIAL_H 00019 00020 template <class T> 00021 class CircBufferHostSerial { 00022 public: 00023 CircBufferHostSerial(uint32_t buf_size):write(0), read(0), size(buf_size + 1) { 00024 _buf = new T [size]; 00025 } 00026 00027 ~CircBufferHostSerial() { 00028 delete [] _buf; 00029 } 00030 00031 bool isFull() { 00032 return ((write + 1) % size == read); 00033 } 00034 00035 bool isEmpty() { 00036 return (read == write); 00037 } 00038 00039 void flush() { 00040 write = 0; 00041 read = 0; 00042 } 00043 00044 void queue(T k) { 00045 if (isFull()) { 00046 read++; 00047 read %= size; 00048 } 00049 _buf[write++] = k; 00050 write %= size; 00051 } 00052 00053 uint32_t available() { 00054 return (write >= read) ? write - read : size - read + write; 00055 } 00056 00057 bool dequeue(T * c) { 00058 bool empty = isEmpty(); 00059 if (!empty) { 00060 *c = _buf[read++]; 00061 read %= size; 00062 } 00063 return(!empty); 00064 } 00065 00066 private: 00067 volatile uint32_t write; 00068 volatile uint32_t read; 00069 int size; 00070 T * _buf; 00071 }; 00072 #endif 00073
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