Yihui Xiong / nrf51822_fix_i2c_spi_conflict

fix nrf51822 i2c & spi conflict

Dependencies:   BLE_API eMPL_MPU6050 nRF51822

Fork of Seeed_Tiny_BLE_Flash by Darren Huang

mbed-src/api/CircularBuffer.h@5:b8c02645e6af, 2015-11-17 (annotated)

Committer:
yihui
Date:
Tue Nov 17 07:48:56 2015 +0000
Revision:
5:b8c02645e6af
fix i2c & spi conflict

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yihui 5:b8c02645e6af 1 /* mbed Microcontroller Library
yihui 5:b8c02645e6af 2 * Copyright (c) 2015 ARM Limited
yihui 5:b8c02645e6af 3 *
yihui 5:b8c02645e6af 4 * Licensed under the Apache License, Version 2.0 (the "License");
yihui 5:b8c02645e6af 5 * you may not use this file except in compliance with the License.
yihui 5:b8c02645e6af 6 * You may obtain a copy of the License at
yihui 5:b8c02645e6af 7 *
yihui 5:b8c02645e6af 8 * http://www.apache.org/licenses/LICENSE-2.0
yihui 5:b8c02645e6af 9 *
yihui 5:b8c02645e6af 10 * Unless required by applicable law or agreed to in writing, software
yihui 5:b8c02645e6af 11 * distributed under the License is distributed on an "AS IS" BASIS,
yihui 5:b8c02645e6af 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
yihui 5:b8c02645e6af 13 * See the License for the specific language governing permissions and
yihui 5:b8c02645e6af 14 * limitations under the License.
yihui 5:b8c02645e6af 15 */
yihui 5:b8c02645e6af 16 #ifndef MBED_CIRCULARBUFFER_H
yihui 5:b8c02645e6af 17 #define MBED_CIRCULARBUFFER_H
yihui 5:b8c02645e6af 18
yihui 5:b8c02645e6af 19 namespace mbed {
yihui 5:b8c02645e6af 20
yihui 5:b8c02645e6af 21 /** Templated Circular buffer class
yihui 5:b8c02645e6af 22 */
yihui 5:b8c02645e6af 23 template<typename T, uint32_t BufferSize, typename CounterType = uint32_t>
yihui 5:b8c02645e6af 24 class CircularBuffer {
yihui 5:b8c02645e6af 25 public:
yihui 5:b8c02645e6af 26 CircularBuffer() : _head(0), _tail(0), _full(false) {
yihui 5:b8c02645e6af 27 }
yihui 5:b8c02645e6af 28
yihui 5:b8c02645e6af 29 ~CircularBuffer() {
yihui 5:b8c02645e6af 30 }
yihui 5:b8c02645e6af 31
yihui 5:b8c02645e6af 32 /** Push the transaction to the buffer. This overwrites the buffer if it's
yihui 5:b8c02645e6af 33 * full
yihui 5:b8c02645e6af 34 *
yihui 5:b8c02645e6af 35 * @param data Data to be pushed to the buffer
yihui 5:b8c02645e6af 36 */
yihui 5:b8c02645e6af 37 void push(const T& data) {
yihui 5:b8c02645e6af 38 if (full()) {
yihui 5:b8c02645e6af 39 _tail++;
yihui 5:b8c02645e6af 40 _tail %= BufferSize;
yihui 5:b8c02645e6af 41 }
yihui 5:b8c02645e6af 42 _pool[_head++] = data;
yihui 5:b8c02645e6af 43 _head %= BufferSize;
yihui 5:b8c02645e6af 44 if (_head == _tail) {
yihui 5:b8c02645e6af 45 _full = true;
yihui 5:b8c02645e6af 46 }
yihui 5:b8c02645e6af 47 }
yihui 5:b8c02645e6af 48
yihui 5:b8c02645e6af 49 /** Pop the transaction from the buffer
yihui 5:b8c02645e6af 50 *
yihui 5:b8c02645e6af 51 * @param data Data to be pushed to the buffer
yihui 5:b8c02645e6af 52 * @return True if the buffer is not empty and data contains a transaction, false otherwise
yihui 5:b8c02645e6af 53 */
yihui 5:b8c02645e6af 54 bool pop(T& data) {
yihui 5:b8c02645e6af 55 if (!empty()) {
yihui 5:b8c02645e6af 56 data = _pool[_tail++];
yihui 5:b8c02645e6af 57 _tail %= BufferSize;
yihui 5:b8c02645e6af 58 _full = false;
yihui 5:b8c02645e6af 59 return true;
yihui 5:b8c02645e6af 60 }
yihui 5:b8c02645e6af 61 return false;
yihui 5:b8c02645e6af 62 }
yihui 5:b8c02645e6af 63
yihui 5:b8c02645e6af 64 /** Check if the buffer is empty
yihui 5:b8c02645e6af 65 *
yihui 5:b8c02645e6af 66 * @return True if the buffer is empty, false if not
yihui 5:b8c02645e6af 67 */
yihui 5:b8c02645e6af 68 bool empty() {
yihui 5:b8c02645e6af 69 return (_head == _tail) && !_full;
yihui 5:b8c02645e6af 70 }
yihui 5:b8c02645e6af 71
yihui 5:b8c02645e6af 72 /** Check if the buffer is full
yihui 5:b8c02645e6af 73 *
yihui 5:b8c02645e6af 74 * @return True if the buffer is full, false if not
yihui 5:b8c02645e6af 75 */
yihui 5:b8c02645e6af 76 bool full() {
yihui 5:b8c02645e6af 77 return _full;
yihui 5:b8c02645e6af 78 }
yihui 5:b8c02645e6af 79
yihui 5:b8c02645e6af 80 /** Reset the buffer
yihui 5:b8c02645e6af 81 *
yihui 5:b8c02645e6af 82 */
yihui 5:b8c02645e6af 83 void reset() {
yihui 5:b8c02645e6af 84 _head = 0;
yihui 5:b8c02645e6af 85 _tail = 0;
yihui 5:b8c02645e6af 86 _full = false;
yihui 5:b8c02645e6af 87 }
yihui 5:b8c02645e6af 88
yihui 5:b8c02645e6af 89 private:
yihui 5:b8c02645e6af 90 T _pool[BufferSize];
yihui 5:b8c02645e6af 91 volatile CounterType _head;
yihui 5:b8c02645e6af 92 volatile CounterType _tail;
yihui 5:b8c02645e6af 93 volatile bool _full;
yihui 5:b8c02645e6af 94 };
yihui 5:b8c02645e6af 95
yihui 5:b8c02645e6af 96 }
yihui 5:b8c02645e6af 97
yihui 5:b8c02645e6af 98 #endif