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WizFi310/CBuffer.h@2:ee7e278fe372, 2017-09-17 (annotated)

Committer:
ajeet3004
Date:
Sun Sep 17 05:30:43 2017 +0000
Revision:
2:ee7e278fe372
Parent:
0:774ff1e8b26b 
no change

Who changed what in which revision?

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kaizen 0:774ff1e8b26b 1 /* Copyright (C) 2012 mbed.org, MIT License
kaizen 0:774ff1e8b26b 2 *
kaizen 0:774ff1e8b26b 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
kaizen 0:774ff1e8b26b 4 * and associated documentation files (the "Software"), to deal in the Software without restriction,
kaizen 0:774ff1e8b26b 5 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
kaizen 0:774ff1e8b26b 6 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
kaizen 0:774ff1e8b26b 7 * furnished to do so, subject to the following conditions:
kaizen 0:774ff1e8b26b 8 *
kaizen 0:774ff1e8b26b 9 * The above copyright notice and this permission notice shall be included in all copies or
kaizen 0:774ff1e8b26b 10 * substantial portions of the Software.
kaizen 0:774ff1e8b26b 11 *
kaizen 0:774ff1e8b26b 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
kaizen 0:774ff1e8b26b 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
kaizen 0:774ff1e8b26b 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
kaizen 0:774ff1e8b26b 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
kaizen 0:774ff1e8b26b 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
kaizen 0:774ff1e8b26b 17 */
kaizen 0:774ff1e8b26b 18
kaizen 0:774ff1e8b26b 19 #ifndef CIRCBUFFER_H_
kaizen 0:774ff1e8b26b 20 #define CIRCBUFFER_H_
kaizen 0:774ff1e8b26b 21
kaizen 0:774ff1e8b26b 22 template <class T>
kaizen 0:774ff1e8b26b 23 class CircBuffer {
kaizen 0:774ff1e8b26b 24 public:
kaizen 0:774ff1e8b26b 25 CircBuffer(int length) {
kaizen 0:774ff1e8b26b 26 write = 0;
kaizen 0:774ff1e8b26b 27 read = 0;
kaizen 0:774ff1e8b26b 28 size = length + 1;
kaizen 0:774ff1e8b26b 29 buf = (T *)malloc(size * sizeof(T));
kaizen 0:774ff1e8b26b 30 if (buf == NULL)
kaizen 0:774ff1e8b26b 31 error("Can't allocate memory");
kaizen 0:774ff1e8b26b 32 };
kaizen 0:774ff1e8b26b 33
kaizen 0:774ff1e8b26b 34 bool isFull() {
kaizen 0:774ff1e8b26b 35 return (((write + 1) % size) == read);
kaizen 0:774ff1e8b26b 36 };
kaizen 0:774ff1e8b26b 37
kaizen 0:774ff1e8b26b 38 bool isEmpty() {
kaizen 0:774ff1e8b26b 39 return (read == write);
kaizen 0:774ff1e8b26b 40 };
kaizen 0:774ff1e8b26b 41
kaizen 0:774ff1e8b26b 42 void queue(T k) {
kaizen 0:774ff1e8b26b 43 if (isFull()) {
kaizen 0:774ff1e8b26b 44 // read++;
kaizen 0:774ff1e8b26b 45 // read %= size;
kaizen 0:774ff1e8b26b 46 return;
kaizen 0:774ff1e8b26b 47 }
kaizen 0:774ff1e8b26b 48 buf[write++] = k;
kaizen 0:774ff1e8b26b 49 write %= size;
kaizen 0:774ff1e8b26b 50 }
kaizen 0:774ff1e8b26b 51
kaizen 0:774ff1e8b26b 52 void flush() {
kaizen 0:774ff1e8b26b 53 read = 0;
kaizen 0:774ff1e8b26b 54 write = 0;
kaizen 0:774ff1e8b26b 55 }
kaizen 0:774ff1e8b26b 56
kaizen 0:774ff1e8b26b 57
kaizen 0:774ff1e8b26b 58 uint32_t available() {
kaizen 0:774ff1e8b26b 59 return (write >= read) ? write - read : size - read + write;
kaizen 0:774ff1e8b26b 60 };
kaizen 0:774ff1e8b26b 61
kaizen 0:774ff1e8b26b 62 bool dequeue(T * c) {
kaizen 0:774ff1e8b26b 63 bool empty = isEmpty();
kaizen 0:774ff1e8b26b 64 if (!empty) {
kaizen 0:774ff1e8b26b 65 *c = buf[read++];
kaizen 0:774ff1e8b26b 66 read %= size;
kaizen 0:774ff1e8b26b 67 }
kaizen 0:774ff1e8b26b 68 return(!empty);
kaizen 0:774ff1e8b26b 69 };
kaizen 0:774ff1e8b26b 70
kaizen 0:774ff1e8b26b 71 private:
kaizen 0:774ff1e8b26b 72 volatile uint32_t write;
kaizen 0:774ff1e8b26b 73 volatile uint32_t read;
kaizen 0:774ff1e8b26b 74 uint32_t size;
kaizen 0:774ff1e8b26b 75 T * buf;
kaizen 0:774ff1e8b26b 76 };
kaizen 0:774ff1e8b26b 77
kaizen 0:774ff1e8b26b 78 #endif