Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

api/CircularBuffer.h@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2015 ARM Limited
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 */
<> 144:ef7eb2e8f9f7 16 #ifndef MBED_CIRCULARBUFFER_H
<> 144:ef7eb2e8f9f7 17 #define MBED_CIRCULARBUFFER_H
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #include "critical.h"
<> 144:ef7eb2e8f9f7 20
<> 144:ef7eb2e8f9f7 21 namespace mbed {
<> 144:ef7eb2e8f9f7 22
<> 144:ef7eb2e8f9f7 23 /** Templated Circular buffer class
<> 144:ef7eb2e8f9f7 24 *
<> 144:ef7eb2e8f9f7 25 * @Note Synchronization level: Interrupt safe
<> 144:ef7eb2e8f9f7 26 */
<> 144:ef7eb2e8f9f7 27 template<typename T, uint32_t BufferSize, typename CounterType = uint32_t>
<> 144:ef7eb2e8f9f7 28 class CircularBuffer {
<> 144:ef7eb2e8f9f7 29 public:
<> 144:ef7eb2e8f9f7 30 CircularBuffer() : _head(0), _tail(0), _full(false) {
<> 144:ef7eb2e8f9f7 31 }
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 ~CircularBuffer() {
<> 144:ef7eb2e8f9f7 34 }
<> 144:ef7eb2e8f9f7 35
<> 144:ef7eb2e8f9f7 36 /** Push the transaction to the buffer. This overwrites the buffer if it's
<> 144:ef7eb2e8f9f7 37 * full
<> 144:ef7eb2e8f9f7 38 *
<> 144:ef7eb2e8f9f7 39 * @param data Data to be pushed to the buffer
<> 144:ef7eb2e8f9f7 40 */
<> 144:ef7eb2e8f9f7 41 void push(const T& data) {
<> 144:ef7eb2e8f9f7 42 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 43 if (full()) {
<> 144:ef7eb2e8f9f7 44 _tail++;
<> 144:ef7eb2e8f9f7 45 _tail %= BufferSize;
<> 144:ef7eb2e8f9f7 46 }
<> 144:ef7eb2e8f9f7 47 _pool[_head++] = data;
<> 144:ef7eb2e8f9f7 48 _head %= BufferSize;
<> 144:ef7eb2e8f9f7 49 if (_head == _tail) {
<> 144:ef7eb2e8f9f7 50 _full = true;
<> 144:ef7eb2e8f9f7 51 }
<> 144:ef7eb2e8f9f7 52 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 53 }
<> 144:ef7eb2e8f9f7 54
<> 144:ef7eb2e8f9f7 55 /** Pop the transaction from the buffer
<> 144:ef7eb2e8f9f7 56 *
<> 144:ef7eb2e8f9f7 57 * @param data Data to be pushed to the buffer
<> 144:ef7eb2e8f9f7 58 * @return True if the buffer is not empty and data contains a transaction, false otherwise
<> 144:ef7eb2e8f9f7 59 */
<> 144:ef7eb2e8f9f7 60 bool pop(T& data) {
<> 144:ef7eb2e8f9f7 61 bool data_popped = false;
<> 144:ef7eb2e8f9f7 62 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 63 if (!empty()) {
<> 144:ef7eb2e8f9f7 64 data = _pool[_tail++];
<> 144:ef7eb2e8f9f7 65 _tail %= BufferSize;
<> 144:ef7eb2e8f9f7 66 _full = false;
<> 144:ef7eb2e8f9f7 67 data_popped = true;
<> 144:ef7eb2e8f9f7 68 }
<> 144:ef7eb2e8f9f7 69 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 70 return data_popped;
<> 144:ef7eb2e8f9f7 71 }
<> 144:ef7eb2e8f9f7 72
<> 144:ef7eb2e8f9f7 73 /** Check if the buffer is empty
<> 144:ef7eb2e8f9f7 74 *
<> 144:ef7eb2e8f9f7 75 * @return True if the buffer is empty, false if not
<> 144:ef7eb2e8f9f7 76 */
<> 144:ef7eb2e8f9f7 77 bool empty() {
<> 144:ef7eb2e8f9f7 78 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 79 bool is_empty = (_head == _tail) && !_full;
<> 144:ef7eb2e8f9f7 80 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 81 return is_empty;
<> 144:ef7eb2e8f9f7 82 }
<> 144:ef7eb2e8f9f7 83
<> 144:ef7eb2e8f9f7 84 /** Check if the buffer is full
<> 144:ef7eb2e8f9f7 85 *
<> 144:ef7eb2e8f9f7 86 * @return True if the buffer is full, false if not
<> 144:ef7eb2e8f9f7 87 */
<> 144:ef7eb2e8f9f7 88 bool full() {
<> 144:ef7eb2e8f9f7 89 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 90 bool full = _full;
<> 144:ef7eb2e8f9f7 91 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 92 return full;
<> 144:ef7eb2e8f9f7 93 }
<> 144:ef7eb2e8f9f7 94
<> 144:ef7eb2e8f9f7 95 /** Reset the buffer
<> 144:ef7eb2e8f9f7 96 *
<> 144:ef7eb2e8f9f7 97 */
<> 144:ef7eb2e8f9f7 98 void reset() {
<> 144:ef7eb2e8f9f7 99 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 100 _head = 0;
<> 144:ef7eb2e8f9f7 101 _tail = 0;
<> 144:ef7eb2e8f9f7 102 _full = false;
<> 144:ef7eb2e8f9f7 103 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 104 }
<> 144:ef7eb2e8f9f7 105
<> 144:ef7eb2e8f9f7 106 private:
<> 144:ef7eb2e8f9f7 107 T _pool[BufferSize];
<> 144:ef7eb2e8f9f7 108 volatile CounterType _head;
<> 144:ef7eb2e8f9f7 109 volatile CounterType _tail;
<> 144:ef7eb2e8f9f7 110 volatile bool _full;
<> 144:ef7eb2e8f9f7 111 };
<> 144:ef7eb2e8f9f7 112
<> 144:ef7eb2e8f9f7 113 }
<> 144:ef7eb2e8f9f7 114
<> 144:ef7eb2e8f9f7 115 #endif