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Dependencies:   Matrix mbed

USBSerial/CircBuffer.h@0:5e35c180ed4a, 2015-11-23 (annotated)

Committer:
Racer01014
Date:
Mon Nov 23 16:09:54 2015 +0000
Revision:
0:5e35c180ed4a
-

Who changed what in which revision?

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Racer01014 0:5e35c180ed4a 1 /* Copyright (c) 2010-2011 mbed.org, MIT License
Racer01014 0:5e35c180ed4a 2 *
Racer01014 0:5e35c180ed4a 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
Racer01014 0:5e35c180ed4a 4 * and associated documentation files (the "Software"), to deal in the Software without
Racer01014 0:5e35c180ed4a 5 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
Racer01014 0:5e35c180ed4a 6 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
Racer01014 0:5e35c180ed4a 7 * Software is furnished to do so, subject to the following conditions:
Racer01014 0:5e35c180ed4a 8 *
Racer01014 0:5e35c180ed4a 9 * The above copyright notice and this permission notice shall be included in all copies or
Racer01014 0:5e35c180ed4a 10 * substantial portions of the Software.
Racer01014 0:5e35c180ed4a 11 *
Racer01014 0:5e35c180ed4a 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
Racer01014 0:5e35c180ed4a 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
Racer01014 0:5e35c180ed4a 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
Racer01014 0:5e35c180ed4a 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
Racer01014 0:5e35c180ed4a 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Racer01014 0:5e35c180ed4a 17 */
Racer01014 0:5e35c180ed4a 18
Racer01014 0:5e35c180ed4a 19 #ifndef CIRCBUFFER_H
Racer01014 0:5e35c180ed4a 20 #define CIRCBUFFER_H
Racer01014 0:5e35c180ed4a 21
Racer01014 0:5e35c180ed4a 22 template <class T>
Racer01014 0:5e35c180ed4a 23 class CircBuffer {
Racer01014 0:5e35c180ed4a 24 public:
Racer01014 0:5e35c180ed4a 25 CircBuffer(int length) {
Racer01014 0:5e35c180ed4a 26 write = 0;
Racer01014 0:5e35c180ed4a 27 read = 0;
Racer01014 0:5e35c180ed4a 28 size = length + 1;
Racer01014 0:5e35c180ed4a 29 buf = (T *)malloc(size * sizeof(T));
Racer01014 0:5e35c180ed4a 30 };
Racer01014 0:5e35c180ed4a 31
Racer01014 0:5e35c180ed4a 32 bool isFull() {
Racer01014 0:5e35c180ed4a 33 return ((write + 1) % size == read);
Racer01014 0:5e35c180ed4a 34 };
Racer01014 0:5e35c180ed4a 35
Racer01014 0:5e35c180ed4a 36 bool isEmpty() {
Racer01014 0:5e35c180ed4a 37 return (read == write);
Racer01014 0:5e35c180ed4a 38 };
Racer01014 0:5e35c180ed4a 39
Racer01014 0:5e35c180ed4a 40 void queue(T k) {
Racer01014 0:5e35c180ed4a 41 if (isFull()) {
Racer01014 0:5e35c180ed4a 42 read++;
Racer01014 0:5e35c180ed4a 43 read %= size;
Racer01014 0:5e35c180ed4a 44 }
Racer01014 0:5e35c180ed4a 45 buf[write++] = k;
Racer01014 0:5e35c180ed4a 46 write %= size;
Racer01014 0:5e35c180ed4a 47 }
Racer01014 0:5e35c180ed4a 48
Racer01014 0:5e35c180ed4a 49 uint16_t available() {
Racer01014 0:5e35c180ed4a 50 return (write >= read) ? write - read : size - read + write;
Racer01014 0:5e35c180ed4a 51 };
Racer01014 0:5e35c180ed4a 52
Racer01014 0:5e35c180ed4a 53 bool dequeue(T * c) {
Racer01014 0:5e35c180ed4a 54 bool empty = isEmpty();
Racer01014 0:5e35c180ed4a 55 if (!empty) {
Racer01014 0:5e35c180ed4a 56 *c = buf[read++];
Racer01014 0:5e35c180ed4a 57 read %= size;
Racer01014 0:5e35c180ed4a 58 }
Racer01014 0:5e35c180ed4a 59 return(!empty);
Racer01014 0:5e35c180ed4a 60 };
Racer01014 0:5e35c180ed4a 61
Racer01014 0:5e35c180ed4a 62 private:
Racer01014 0:5e35c180ed4a 63 volatile uint16_t write;
Racer01014 0:5e35c180ed4a 64 volatile uint16_t read;
Racer01014 0:5e35c180ed4a 65 uint16_t size;
Racer01014 0:5e35c180ed4a 66 T * buf;
Racer01014 0:5e35c180ed4a 67 };
Racer01014 0:5e35c180ed4a 68
Racer01014 0:5e35c180ed4a 69 #endif