Support Isochronous transfer additionally
Dependents: USBHostC270_example_GR-PEACH USBHostDac_example USBHostDac_Audio_in_out
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MtxCircBuffer.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 MTXCIRCBUFFER_H 00018 #define MTXCIRCBUFFER_H 00019 00020 #include "stdint.h" 00021 00022 //Mutex protected circular buffer 00023 template<typename T, int size> 00024 class MtxCircBuffer { 00025 public: 00026 00027 MtxCircBuffer() { 00028 write = 0; 00029 read = 0; 00030 } 00031 00032 bool isFull() { 00033 return (((write + 1) % size) == read); 00034 } 00035 00036 bool isEmpty() { 00037 return (read == write); 00038 } 00039 00040 void flush() { 00041 write = 0; 00042 read = 0; 00043 } 00044 00045 bool queue(T k) { 00046 if (isFull()) { 00047 return false; 00048 } 00049 buf[write] = k; 00050 write = (write + 1) % size; 00051 return true; 00052 } 00053 00054 uint32_t available() { 00055 uint32_t a = (write >= read) ? (write - read) : (size - read + write); 00056 return a; 00057 } 00058 00059 bool dequeue(T * c) { 00060 if (isEmpty()) { 00061 return false; 00062 } 00063 *c = buf[read]; 00064 read = (read + 1) % size; 00065 return true; 00066 } 00067 00068 private: 00069 volatile uint32_t write; 00070 volatile uint32_t read; 00071 volatile T buf[size]; 00072 }; 00073 00074 #endif 00075
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