USBMSD SD card Hello World for Mbed platforms
Dependencies: mbed USBMSD_SD USBDevice
Diff: USBDevice/USBSERIAL/CBuffer.h
- Revision:
- 11:a26e7b7a1221
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/USBDevice/USBSERIAL/CBuffer.h Wed Nov 16 17:17:42 2011 +0000 @@ -0,0 +1,69 @@ +/* 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 CBUFFER_H +#define CBUFFER_H + +#define MAX_BUF 128 + +class CBuffer { +public: + CBuffer() { + write = 0; + read = 0; + size = MAX_BUF + 1; + }; + + bool isFull() { + return ((write + 1) % size == read); + }; + + bool isEmpty() { + return (read == write); + }; + + void queue(uint8_t k) { + if (isFull()) { + read++; + read %= size; + } + buf[write++] = k; + write %= size; + } + + uint16_t available() { + return (write >= read) ? write - read : size - read + write; + }; + + bool dequeue(uint8_t * c) { + if (!isEmpty()) { + *c = buf[read++]; + read %= size; + } + return(isEmpty()); + }; + + +private: + volatile uint16_t write; + volatile uint16_t read; + uint16_t size; + uint8_t buf[MAX_BUF + 1]; +}; + +#endif \ No newline at end of file