avnish aggarwal / Mbed 2 deprecated USB-MSD_SD_HelloWorld_Mbed-RAMVersion

ram version see usbmsd_sd.cpp ram ok fs CANNOT be installed - too small use for illustrative purpose only

Dependencies:   USBDevice USBMSD_SD mbed

Fork of USBMSD_SD_HelloWorld_Mbed by Samuel Mokrani

USBDevice/USBSERIAL/CBuffer.h@11:a26e7b7a1221, 2011-11-16 (annotated)

Committer:
samux
Date:
Wed Nov 16 17:17:42 2011 +0000
Revision:
11:a26e7b7a1221
GOOD COMMIT: msd and hid work even on MAC...

Who changed what in which revision?

UserRevisionLine numberNew contents of line
samux 11:a26e7b7a1221 1 /* Copyright (c) 2010-2011 mbed.org, MIT License
samux 11:a26e7b7a1221 2 *
samux 11:a26e7b7a1221 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
samux 11:a26e7b7a1221 4 * and associated documentation files (the "Software"), to deal in the Software without
samux 11:a26e7b7a1221 5 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
samux 11:a26e7b7a1221 6 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
samux 11:a26e7b7a1221 7 * Software is furnished to do so, subject to the following conditions:
samux 11:a26e7b7a1221 8 *
samux 11:a26e7b7a1221 9 * The above copyright notice and this permission notice shall be included in all copies or
samux 11:a26e7b7a1221 10 * substantial portions of the Software.
samux 11:a26e7b7a1221 11 *
samux 11:a26e7b7a1221 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
samux 11:a26e7b7a1221 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
samux 11:a26e7b7a1221 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
samux 11:a26e7b7a1221 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
samux 11:a26e7b7a1221 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
samux 11:a26e7b7a1221 17 */
samux 11:a26e7b7a1221 18
samux 11:a26e7b7a1221 19 #ifndef CBUFFER_H
samux 11:a26e7b7a1221 20 #define CBUFFER_H
samux 11:a26e7b7a1221 21
samux 11:a26e7b7a1221 22 #define MAX_BUF 128
samux 11:a26e7b7a1221 23
samux 11:a26e7b7a1221 24 class CBuffer {
samux 11:a26e7b7a1221 25 public:
samux 11:a26e7b7a1221 26 CBuffer() {
samux 11:a26e7b7a1221 27 write = 0;
samux 11:a26e7b7a1221 28 read = 0;
samux 11:a26e7b7a1221 29 size = MAX_BUF + 1;
samux 11:a26e7b7a1221 30 };
samux 11:a26e7b7a1221 31
samux 11:a26e7b7a1221 32 bool isFull() {
samux 11:a26e7b7a1221 33 return ((write + 1) % size == read);
samux 11:a26e7b7a1221 34 };
samux 11:a26e7b7a1221 35
samux 11:a26e7b7a1221 36 bool isEmpty() {
samux 11:a26e7b7a1221 37 return (read == write);
samux 11:a26e7b7a1221 38 };
samux 11:a26e7b7a1221 39
samux 11:a26e7b7a1221 40 void queue(uint8_t k) {
samux 11:a26e7b7a1221 41 if (isFull()) {
samux 11:a26e7b7a1221 42 read++;
samux 11:a26e7b7a1221 43 read %= size;
samux 11:a26e7b7a1221 44 }
samux 11:a26e7b7a1221 45 buf[write++] = k;
samux 11:a26e7b7a1221 46 write %= size;
samux 11:a26e7b7a1221 47 }
samux 11:a26e7b7a1221 48
samux 11:a26e7b7a1221 49 uint16_t available() {
samux 11:a26e7b7a1221 50 return (write >= read) ? write - read : size - read + write;
samux 11:a26e7b7a1221 51 };
samux 11:a26e7b7a1221 52
samux 11:a26e7b7a1221 53 bool dequeue(uint8_t * c) {
samux 11:a26e7b7a1221 54 if (!isEmpty()) {
samux 11:a26e7b7a1221 55 *c = buf[read++];
samux 11:a26e7b7a1221 56 read %= size;
samux 11:a26e7b7a1221 57 }
samux 11:a26e7b7a1221 58 return(isEmpty());
samux 11:a26e7b7a1221 59 };
samux 11:a26e7b7a1221 60
samux 11:a26e7b7a1221 61
samux 11:a26e7b7a1221 62 private:
samux 11:a26e7b7a1221 63 volatile uint16_t write;
samux 11:a26e7b7a1221 64 volatile uint16_t read;
samux 11:a26e7b7a1221 65 uint16_t size;
samux 11:a26e7b7a1221 66 uint8_t buf[MAX_BUF + 1];
samux 11:a26e7b7a1221 67 };
samux 11:a26e7b7a1221 68
samux 11:a26e7b7a1221 69 #endif