USBMSD SD card Hello World for Mbed platforms
Dependencies: mbed USBMSD_SD USBDevice
USBDevice/USBSERIAL/CBuffer.h
- Committer:
- samux
- Date:
- 2011-11-16
- Revision:
- 11:a26e7b7a1221
File content as of revision 11:a26e7b7a1221:
/* 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