不韋 呂 / F746_SD_BitmapViewer

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Dependencies:   SDFileSystem_Warning_Fixed F746_GUI

mbed_src_STM32F7/api/CircularBuffer.h@0:f62ffd3644bf, 2018-10-21 (annotated)

Committer:
MikamiUitOpen
Date:
Sun Oct 21 11:29:47 2018 +0000
Revision:
0:f62ffd3644bf
1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:f62ffd3644bf 1 /* mbed Microcontroller Library
MikamiUitOpen 0:f62ffd3644bf 2 * Copyright (c) 2015 ARM Limited
MikamiUitOpen 0:f62ffd3644bf 3 *
MikamiUitOpen 0:f62ffd3644bf 4 * Licensed under the Apache License, Version 2.0 (the "License");
MikamiUitOpen 0:f62ffd3644bf 5 * you may not use this file except in compliance with the License.
MikamiUitOpen 0:f62ffd3644bf 6 * You may obtain a copy of the License at
MikamiUitOpen 0:f62ffd3644bf 7 *
MikamiUitOpen 0:f62ffd3644bf 8 * http://www.apache.org/licenses/LICENSE-2.0
MikamiUitOpen 0:f62ffd3644bf 9 *
MikamiUitOpen 0:f62ffd3644bf 10 * Unless required by applicable law or agreed to in writing, software
MikamiUitOpen 0:f62ffd3644bf 11 * distributed under the License is distributed on an "AS IS" BASIS,
MikamiUitOpen 0:f62ffd3644bf 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
MikamiUitOpen 0:f62ffd3644bf 13 * See the License for the specific language governing permissions and
MikamiUitOpen 0:f62ffd3644bf 14 * limitations under the License.
MikamiUitOpen 0:f62ffd3644bf 15 */
MikamiUitOpen 0:f62ffd3644bf 16 #ifndef MBED_CIRCULARBUFFER_H
MikamiUitOpen 0:f62ffd3644bf 17 #define MBED_CIRCULARBUFFER_H
MikamiUitOpen 0:f62ffd3644bf 18
MikamiUitOpen 0:f62ffd3644bf 19 namespace mbed {
MikamiUitOpen 0:f62ffd3644bf 20
MikamiUitOpen 0:f62ffd3644bf 21 /** Templated Circular buffer class
MikamiUitOpen 0:f62ffd3644bf 22 */
MikamiUitOpen 0:f62ffd3644bf 23 template<typename T, uint32_t BufferSize, typename CounterType = uint32_t>
MikamiUitOpen 0:f62ffd3644bf 24 class CircularBuffer {
MikamiUitOpen 0:f62ffd3644bf 25 public:
MikamiUitOpen 0:f62ffd3644bf 26 CircularBuffer() : _head(0), _tail(0), _full(false) {
MikamiUitOpen 0:f62ffd3644bf 27 }
MikamiUitOpen 0:f62ffd3644bf 28
MikamiUitOpen 0:f62ffd3644bf 29 ~CircularBuffer() {
MikamiUitOpen 0:f62ffd3644bf 30 }
MikamiUitOpen 0:f62ffd3644bf 31
MikamiUitOpen 0:f62ffd3644bf 32 /** Push the transaction to the buffer. This overwrites the buffer if it's
MikamiUitOpen 0:f62ffd3644bf 33 * full
MikamiUitOpen 0:f62ffd3644bf 34 *
MikamiUitOpen 0:f62ffd3644bf 35 * @param data Data to be pushed to the buffer
MikamiUitOpen 0:f62ffd3644bf 36 */
MikamiUitOpen 0:f62ffd3644bf 37 void push(const T& data) {
MikamiUitOpen 0:f62ffd3644bf 38 if (full()) {
MikamiUitOpen 0:f62ffd3644bf 39 _tail++;
MikamiUitOpen 0:f62ffd3644bf 40 _tail %= BufferSize;
MikamiUitOpen 0:f62ffd3644bf 41 }
MikamiUitOpen 0:f62ffd3644bf 42 _pool[_head++] = data;
MikamiUitOpen 0:f62ffd3644bf 43 _head %= BufferSize;
MikamiUitOpen 0:f62ffd3644bf 44 if (_head == _tail) {
MikamiUitOpen 0:f62ffd3644bf 45 _full = true;
MikamiUitOpen 0:f62ffd3644bf 46 }
MikamiUitOpen 0:f62ffd3644bf 47 }
MikamiUitOpen 0:f62ffd3644bf 48
MikamiUitOpen 0:f62ffd3644bf 49 /** Pop the transaction from the buffer
MikamiUitOpen 0:f62ffd3644bf 50 *
MikamiUitOpen 0:f62ffd3644bf 51 * @param data Data to be pushed to the buffer
MikamiUitOpen 0:f62ffd3644bf 52 * @return True if the buffer is not empty and data contains a transaction, false otherwise
MikamiUitOpen 0:f62ffd3644bf 53 */
MikamiUitOpen 0:f62ffd3644bf 54 bool pop(T& data) {
MikamiUitOpen 0:f62ffd3644bf 55 if (!empty()) {
MikamiUitOpen 0:f62ffd3644bf 56 data = _pool[_tail++];
MikamiUitOpen 0:f62ffd3644bf 57 _tail %= BufferSize;
MikamiUitOpen 0:f62ffd3644bf 58 _full = false;
MikamiUitOpen 0:f62ffd3644bf 59 return true;
MikamiUitOpen 0:f62ffd3644bf 60 }
MikamiUitOpen 0:f62ffd3644bf 61 return false;
MikamiUitOpen 0:f62ffd3644bf 62 }
MikamiUitOpen 0:f62ffd3644bf 63
MikamiUitOpen 0:f62ffd3644bf 64 /** Check if the buffer is empty
MikamiUitOpen 0:f62ffd3644bf 65 *
MikamiUitOpen 0:f62ffd3644bf 66 * @return True if the buffer is empty, false if not
MikamiUitOpen 0:f62ffd3644bf 67 */
MikamiUitOpen 0:f62ffd3644bf 68 bool empty() {
MikamiUitOpen 0:f62ffd3644bf 69 return (_head == _tail) && !_full;
MikamiUitOpen 0:f62ffd3644bf 70 }
MikamiUitOpen 0:f62ffd3644bf 71
MikamiUitOpen 0:f62ffd3644bf 72 /** Check if the buffer is full
MikamiUitOpen 0:f62ffd3644bf 73 *
MikamiUitOpen 0:f62ffd3644bf 74 * @return True if the buffer is full, false if not
MikamiUitOpen 0:f62ffd3644bf 75 */
MikamiUitOpen 0:f62ffd3644bf 76 bool full() {
MikamiUitOpen 0:f62ffd3644bf 77 return _full;
MikamiUitOpen 0:f62ffd3644bf 78 }
MikamiUitOpen 0:f62ffd3644bf 79
MikamiUitOpen 0:f62ffd3644bf 80 /** Reset the buffer
MikamiUitOpen 0:f62ffd3644bf 81 *
MikamiUitOpen 0:f62ffd3644bf 82 */
MikamiUitOpen 0:f62ffd3644bf 83 void reset() {
MikamiUitOpen 0:f62ffd3644bf 84 _head = 0;
MikamiUitOpen 0:f62ffd3644bf 85 _tail = 0;
MikamiUitOpen 0:f62ffd3644bf 86 _full = false;
MikamiUitOpen 0:f62ffd3644bf 87 }
MikamiUitOpen 0:f62ffd3644bf 88
MikamiUitOpen 0:f62ffd3644bf 89 private:
MikamiUitOpen 0:f62ffd3644bf 90 T _pool[BufferSize];
MikamiUitOpen 0:f62ffd3644bf 91 volatile CounterType _head;
MikamiUitOpen 0:f62ffd3644bf 92 volatile CounterType _tail;
MikamiUitOpen 0:f62ffd3644bf 93 volatile bool _full;
MikamiUitOpen 0:f62ffd3644bf 94 };
MikamiUitOpen 0:f62ffd3644bf 95
MikamiUitOpen 0:f62ffd3644bf 96 }
MikamiUitOpen 0:f62ffd3644bf 97
MikamiUitOpen 0:f62ffd3644bf 98 #endif