USBHost custom library.
Dependents: GR-PEACH_HVC-P2_sample_client mbed-os-storage-access GR-PEACH_Digital_Signage GR-PEACH_Audio_Playback_Sample ... more
Fork of USBHost by
Diff: USBHostSerial/MtxCircBuffer.h
- Revision:
- 0:a554658735bf
- Child:
- 4:b320d68e98e7
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/USBHostSerial/MtxCircBuffer.h Wed Mar 06 16:27:14 2013 +0000 @@ -0,0 +1,88 @@ +/* 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 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 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 + +