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Dependencies:   mbed

USBSerialLib/USBSerial/CircBuffer.h@1:6e512faaa17c, 2020-02-21 (annotated)

Committer:
mjoun
Date:
Fri Feb 21 20:40:56 2020 +0000
Revision:
1:6e512faaa17c
works

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mjoun 1:6e512faaa17c 1 /* Copyright (c) 2010-2011 mbed.org, MIT License
mjoun 1:6e512faaa17c 2 *
mjoun 1:6e512faaa17c 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
mjoun 1:6e512faaa17c 4 * and associated documentation files (the "Software"), to deal in the Software without
mjoun 1:6e512faaa17c 5 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
mjoun 1:6e512faaa17c 6 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
mjoun 1:6e512faaa17c 7 * Software is furnished to do so, subject to the following conditions:
mjoun 1:6e512faaa17c 8 *
mjoun 1:6e512faaa17c 9 * The above copyright notice and this permission notice shall be included in all copies or
mjoun 1:6e512faaa17c 10 * substantial portions of the Software.
mjoun 1:6e512faaa17c 11 *
mjoun 1:6e512faaa17c 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
mjoun 1:6e512faaa17c 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
mjoun 1:6e512faaa17c 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
mjoun 1:6e512faaa17c 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mjoun 1:6e512faaa17c 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
mjoun 1:6e512faaa17c 17 */
mjoun 1:6e512faaa17c 18
mjoun 1:6e512faaa17c 19 #ifndef CIRCBUFFER_H
mjoun 1:6e512faaa17c 20 #define CIRCBUFFER_H
mjoun 1:6e512faaa17c 21
mjoun 1:6e512faaa17c 22 template <class T, int Size>
mjoun 1:6e512faaa17c 23 class CircBuffer {
mjoun 1:6e512faaa17c 24 public:
mjoun 1:6e512faaa17c 25 CircBuffer():write(0), read(0){}
mjoun 1:6e512faaa17c 26 bool isFull() {
mjoun 1:6e512faaa17c 27 return ((write + 1) % size == read);
mjoun 1:6e512faaa17c 28 };
mjoun 1:6e512faaa17c 29
mjoun 1:6e512faaa17c 30 bool isEmpty() {
mjoun 1:6e512faaa17c 31 return (read == write);
mjoun 1:6e512faaa17c 32 };
mjoun 1:6e512faaa17c 33
mjoun 1:6e512faaa17c 34 void queue(T k) {
mjoun 1:6e512faaa17c 35 if (isFull()) {
mjoun 1:6e512faaa17c 36 read++;
mjoun 1:6e512faaa17c 37 read %= size;
mjoun 1:6e512faaa17c 38 }
mjoun 1:6e512faaa17c 39 buf[write++] = k;
mjoun 1:6e512faaa17c 40 write %= size;
mjoun 1:6e512faaa17c 41 }
mjoun 1:6e512faaa17c 42
mjoun 1:6e512faaa17c 43 uint16_t available() {
mjoun 1:6e512faaa17c 44 return (write >= read) ? write - read : size - read + write;
mjoun 1:6e512faaa17c 45 };
mjoun 1:6e512faaa17c 46
mjoun 1:6e512faaa17c 47 bool dequeue(T * c) {
mjoun 1:6e512faaa17c 48 bool empty = isEmpty();
mjoun 1:6e512faaa17c 49 if (!empty) {
mjoun 1:6e512faaa17c 50 *c = buf[read++];
mjoun 1:6e512faaa17c 51 read %= size;
mjoun 1:6e512faaa17c 52 }
mjoun 1:6e512faaa17c 53 return(!empty);
mjoun 1:6e512faaa17c 54 };
mjoun 1:6e512faaa17c 55
mjoun 1:6e512faaa17c 56 private:
mjoun 1:6e512faaa17c 57 volatile uint16_t write;
mjoun 1:6e512faaa17c 58 volatile uint16_t read;
mjoun 1:6e512faaa17c 59 static const int size = Size+1; //a modern optimizer should be able to remove this so it uses no ram.
mjoun 1:6e512faaa17c 60 T buf[Size+1];
mjoun 1:6e512faaa17c 61 };
mjoun 1:6e512faaa17c 62
mjoun 1:6e512faaa17c 63 #endif