Seeed Studio / USBDevice

usb device library

Fork of USBDevice by mbed official

USBSerial/CircBuffer.h@11:5592a5e874fe, 2013-07-31 (annotated)

Committer:
seeed
Date:
Wed Jul 31 01:12:05 2013 +0000
Revision:
11:5592a5e874fe
Parent:
1:80ab0d068708 
add meta key

Who changed what in which revision?

UserRevisionLine numberNew contents of line
samux 1:80ab0d068708 1 /* Copyright (c) 2010-2011 mbed.org, MIT License
samux 1:80ab0d068708 2 *
samux 1:80ab0d068708 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
samux 1:80ab0d068708 4 * and associated documentation files (the "Software"), to deal in the Software without
samux 1:80ab0d068708 5 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
samux 1:80ab0d068708 6 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
samux 1:80ab0d068708 7 * Software is furnished to do so, subject to the following conditions:
samux 1:80ab0d068708 8 *
samux 1:80ab0d068708 9 * The above copyright notice and this permission notice shall be included in all copies or
samux 1:80ab0d068708 10 * substantial portions of the Software.
samux 1:80ab0d068708 11 *
samux 1:80ab0d068708 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
samux 1:80ab0d068708 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
samux 1:80ab0d068708 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
samux 1:80ab0d068708 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
samux 1:80ab0d068708 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
samux 1:80ab0d068708 17 */
samux 1:80ab0d068708 18
samux 1:80ab0d068708 19 #ifndef CIRCBUFFER_H
samux 1:80ab0d068708 20 #define CIRCBUFFER_H
samux 1:80ab0d068708 21
samux 1:80ab0d068708 22 template <class T>
samux 1:80ab0d068708 23 class CircBuffer {
samux 1:80ab0d068708 24 public:
samux 1:80ab0d068708 25 CircBuffer(int length) {
samux 1:80ab0d068708 26 write = 0;
samux 1:80ab0d068708 27 read = 0;
samux 1:80ab0d068708 28 size = length + 1;
samux 1:80ab0d068708 29 buf = (T *)malloc(size * sizeof(T));
samux 1:80ab0d068708 30 };
samux 1:80ab0d068708 31
samux 1:80ab0d068708 32 bool isFull() {
samux 1:80ab0d068708 33 return ((write + 1) % size == read);
samux 1:80ab0d068708 34 };
samux 1:80ab0d068708 35
samux 1:80ab0d068708 36 bool isEmpty() {
samux 1:80ab0d068708 37 return (read == write);
samux 1:80ab0d068708 38 };
samux 1:80ab0d068708 39
samux 1:80ab0d068708 40 void queue(T k) {
samux 1:80ab0d068708 41 if (isFull()) {
samux 1:80ab0d068708 42 read++;
samux 1:80ab0d068708 43 read %= size;
samux 1:80ab0d068708 44 }
samux 1:80ab0d068708 45 buf[write++] = k;
samux 1:80ab0d068708 46 write %= size;
samux 1:80ab0d068708 47 }
samux 1:80ab0d068708 48
samux 1:80ab0d068708 49 uint16_t available() {
samux 1:80ab0d068708 50 return (write >= read) ? write - read : size - read + write;
samux 1:80ab0d068708 51 };
samux 1:80ab0d068708 52
samux 1:80ab0d068708 53 bool dequeue(T * c) {
samux 1:80ab0d068708 54 bool empty = isEmpty();
samux 1:80ab0d068708 55 if (!empty) {
samux 1:80ab0d068708 56 *c = buf[read++];
samux 1:80ab0d068708 57 read %= size;
samux 1:80ab0d068708 58 }
samux 1:80ab0d068708 59 return(!empty);
samux 1:80ab0d068708 60 };
samux 1:80ab0d068708 61
samux 1:80ab0d068708 62 private:
samux 1:80ab0d068708 63 volatile uint16_t write;
samux 1:80ab0d068708 64 volatile uint16_t read;
samux 1:80ab0d068708 65 uint16_t size;
samux 1:80ab0d068708 66 T * buf;
samux 1:80ab0d068708 67 };
samux 1:80ab0d068708 68
samux 1:80ab0d068708 69 #endif