2018.07.26
Dependencies: FATFileSystem3 mbed-rtos
Fork of USBHost by
USBHostSerial/MtxCircBuffer.h
- Committer:
- sayzyas
- Date:
- 2018-07-26
- Revision:
- 43:1675750cca08
File content as of revision 43:1675750cca08:
/* mbed USBHost Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef MTXCIRCBUFFER_H #define MTXCIRCBUFFER_H #include "stdint.h" #include "rtos.h" //Mutex protected circular buffer template<typename T, int size> class MtxCircBuffer { public: MtxCircBuffer() { write = 0; read = 0; } bool isFull() { mtx.lock(); bool r = (((write + 1) % size) == read); mtx.unlock(); return r; } bool isEmpty() { mtx.lock(); bool r = (read == write); mtx.unlock(); return r; } void flush() { write = 0; read = 0; } void queue(T k) { mtx.lock(); while (((write + 1) % size) == read) { mtx.unlock(); Thread::wait(10); mtx.lock(); } buf[write++] = k; write %= size; mtx.unlock(); } uint16_t available() { mtx.lock(); uint16_t a = (write >= read) ? (write - read) : (size - read + write); mtx.unlock(); return a; } bool dequeue(T * c) { mtx.lock(); bool empty = (read == write); if (!empty) { *c = buf[read++]; read %= size; } mtx.unlock(); return (!empty); } private: volatile uint16_t write; volatile uint16_t read; volatile T buf[size]; Mutex mtx; }; #endif