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/CircBufferHostSerial.h
- Revision:
- 38:dd168a3e4194
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/USBHostSerial/CircBufferHostSerial.h Tue Mar 14 05:38:25 2017 +0000 @@ -0,0 +1,74 @@ +/* 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 CIRCBUFFERHOSTSERIAL_H +#define CIRCBUFFERHOSTSERIAL_H + +#include "stdint.h" + +template<typename T, int size> +class CircBufferHostSerial { +public: + + CircBufferHostSerial() { + write = 0; + read = 0; + } + + bool isFull() { + return (((write + 1) % size) == read); + } + + bool isEmpty() { + return (read == write); + } + + void flush() { + write = 0; + read = 0; + } + + bool queue(T k) { + if (isFull()) { + return false; + } + buf[write] = k; + write = (write + 1) % size; + return true; + } + + uint32_t available() { + uint32_t a = (write >= read) ? (write - read) : (size - read + write); + return a; + } + + bool dequeue(T * c) { + if (isEmpty()) { + return false; + } + *c = buf[read]; + read = (read + 1) % size; + return true; + } + +private: + volatile uint32_t write; + volatile uint32_t read; + volatile T buf[size]; +}; + +#endif +