USBHost custom library.
Dependents: GR-PEACH_HVC-P2_sample_client mbed-os-storage-access GR-PEACH_Digital_Signage GR-PEACH_Audio_Playback_Sample ... more
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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 #include "stdint.h" 00021 00022 template<typename T, int size> 00023 class CircBufferHostSerial { 00024 public: 00025 00026 CircBufferHostSerial() { 00027 write = 0; 00028 read = 0; 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 bool queue(T k) { 00045 if (isFull()) { 00046 return false; 00047 } 00048 buf[write] = k; 00049 write = (write + 1) % size; 00050 return true; 00051 } 00052 00053 uint32_t available() { 00054 uint32_t a = (write >= read) ? (write - read) : (size - read + write); 00055 return a; 00056 } 00057 00058 bool dequeue(T * c) { 00059 if (isEmpty()) { 00060 return false; 00061 } 00062 *c = buf[read]; 00063 read = (read + 1) % size; 00064 return true; 00065 } 00066 00067 private: 00068 volatile uint32_t write; 00069 volatile uint32_t read; 00070 volatile T buf[size]; 00071 }; 00072 00073 #endif 00074
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