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platform/CircularBuffer.h@168:e84263d55307, 2017-06-21 (annotated)

Committer:
AnnaBridge
Date:
Wed Jun 21 17:46:44 2017 +0100
Revision:
168:e84263d55307
Parent:
160:d5399cc887bb 
This updates the lib to the mbed lib v 145

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2015 ARM Limited
<> 149:156823d33999 3 *
<> 149:156823d33999 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 149:156823d33999 5 * you may not use this file except in compliance with the License.
<> 149:156823d33999 6 * You may obtain a copy of the License at
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 9 *
<> 149:156823d33999 10 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 149:156823d33999 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 13 * See the License for the specific language governing permissions and
<> 149:156823d33999 14 * limitations under the License.
<> 149:156823d33999 15 */
<> 149:156823d33999 16 #ifndef MBED_CIRCULARBUFFER_H
<> 149:156823d33999 17 #define MBED_CIRCULARBUFFER_H
<> 149:156823d33999 18
<> 160:d5399cc887bb 19 #include "platform/mbed_critical.h"
<> 149:156823d33999 20
<> 149:156823d33999 21 namespace mbed {
<> 149:156823d33999 22 /** \addtogroup platform */
<> 149:156823d33999 23
<> 149:156823d33999 24 /** Templated Circular buffer class
<> 149:156823d33999 25 *
AnnaBridge 168:e84263d55307 26 * @note Synchronization level: Interrupt safe
AnnaBridge 168:e84263d55307 27 * @ingroup platform
<> 149:156823d33999 28 */
<> 149:156823d33999 29 template<typename T, uint32_t BufferSize, typename CounterType = uint32_t>
<> 149:156823d33999 30 class CircularBuffer {
<> 149:156823d33999 31 public:
<> 149:156823d33999 32 CircularBuffer() : _head(0), _tail(0), _full(false) {
<> 149:156823d33999 33 }
<> 149:156823d33999 34
<> 149:156823d33999 35 ~CircularBuffer() {
<> 149:156823d33999 36 }
<> 149:156823d33999 37
<> 149:156823d33999 38 /** Push the transaction to the buffer. This overwrites the buffer if it's
<> 149:156823d33999 39 * full
<> 149:156823d33999 40 *
<> 149:156823d33999 41 * @param data Data to be pushed to the buffer
<> 149:156823d33999 42 */
<> 149:156823d33999 43 void push(const T& data) {
<> 149:156823d33999 44 core_util_critical_section_enter();
<> 149:156823d33999 45 if (full()) {
<> 149:156823d33999 46 _tail++;
<> 149:156823d33999 47 _tail %= BufferSize;
<> 149:156823d33999 48 }
<> 149:156823d33999 49 _pool[_head++] = data;
<> 149:156823d33999 50 _head %= BufferSize;
<> 149:156823d33999 51 if (_head == _tail) {
<> 149:156823d33999 52 _full = true;
<> 149:156823d33999 53 }
<> 149:156823d33999 54 core_util_critical_section_exit();
<> 149:156823d33999 55 }
<> 149:156823d33999 56
<> 149:156823d33999 57 /** Pop the transaction from the buffer
<> 149:156823d33999 58 *
<> 149:156823d33999 59 * @param data Data to be pushed to the buffer
<> 149:156823d33999 60 * @return True if the buffer is not empty and data contains a transaction, false otherwise
<> 149:156823d33999 61 */
<> 149:156823d33999 62 bool pop(T& data) {
<> 149:156823d33999 63 bool data_popped = false;
<> 149:156823d33999 64 core_util_critical_section_enter();
<> 149:156823d33999 65 if (!empty()) {
<> 149:156823d33999 66 data = _pool[_tail++];
<> 149:156823d33999 67 _tail %= BufferSize;
<> 149:156823d33999 68 _full = false;
<> 149:156823d33999 69 data_popped = true;
<> 149:156823d33999 70 }
<> 149:156823d33999 71 core_util_critical_section_exit();
<> 149:156823d33999 72 return data_popped;
<> 149:156823d33999 73 }
<> 149:156823d33999 74
<> 149:156823d33999 75 /** Check if the buffer is empty
<> 149:156823d33999 76 *
<> 149:156823d33999 77 * @return True if the buffer is empty, false if not
<> 149:156823d33999 78 */
AnnaBridge 168:e84263d55307 79 bool empty() const {
<> 149:156823d33999 80 core_util_critical_section_enter();
<> 149:156823d33999 81 bool is_empty = (_head == _tail) && !_full;
<> 149:156823d33999 82 core_util_critical_section_exit();
<> 149:156823d33999 83 return is_empty;
<> 149:156823d33999 84 }
<> 149:156823d33999 85
<> 149:156823d33999 86 /** Check if the buffer is full
<> 149:156823d33999 87 *
<> 149:156823d33999 88 * @return True if the buffer is full, false if not
<> 149:156823d33999 89 */
AnnaBridge 168:e84263d55307 90 bool full() const {
<> 149:156823d33999 91 core_util_critical_section_enter();
<> 149:156823d33999 92 bool full = _full;
<> 149:156823d33999 93 core_util_critical_section_exit();
<> 149:156823d33999 94 return full;
<> 149:156823d33999 95 }
<> 149:156823d33999 96
<> 149:156823d33999 97 /** Reset the buffer
<> 149:156823d33999 98 *
<> 149:156823d33999 99 */
<> 149:156823d33999 100 void reset() {
<> 149:156823d33999 101 core_util_critical_section_enter();
<> 149:156823d33999 102 _head = 0;
<> 149:156823d33999 103 _tail = 0;
<> 149:156823d33999 104 _full = false;
<> 149:156823d33999 105 core_util_critical_section_exit();
<> 149:156823d33999 106 }
<> 149:156823d33999 107
<> 149:156823d33999 108 private:
<> 149:156823d33999 109 T _pool[BufferSize];
<> 149:156823d33999 110 volatile CounterType _head;
<> 149:156823d33999 111 volatile CounterType _tail;
<> 149:156823d33999 112 volatile bool _full;
<> 149:156823d33999 113 };
<> 149:156823d33999 114
<> 149:156823d33999 115 }
<> 149:156823d33999 116
<> 149:156823d33999 117 #endif
<> 149:156823d33999 118