Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

api/SingletonPtr.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) 2006-2013 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 SINGLETONPTR_H
<> 144:ef7eb2e8f9f7 17 #define SINGLETONPTR_H
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #include <stdint.h>
<> 144:ef7eb2e8f9f7 20 #include <new>
<> 144:ef7eb2e8f9f7 21 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 22 #ifdef MBED_CONF_RTOS_PRESENT
<> 144:ef7eb2e8f9f7 23 #include "cmsis_os.h"
<> 144:ef7eb2e8f9f7 24 #endif
<> 144:ef7eb2e8f9f7 25
<> 144:ef7eb2e8f9f7 26 #ifdef MBED_CONF_RTOS_PRESENT
<> 144:ef7eb2e8f9f7 27 extern osMutexId singleton_mutex_id;
<> 144:ef7eb2e8f9f7 28 #endif
<> 144:ef7eb2e8f9f7 29
<> 144:ef7eb2e8f9f7 30 /** Lock the singleton mutex
<> 144:ef7eb2e8f9f7 31 *
<> 144:ef7eb2e8f9f7 32 * This function is typically used to provide
<> 144:ef7eb2e8f9f7 33 * exclusive access when initializing a
<> 144:ef7eb2e8f9f7 34 * global object.
<> 144:ef7eb2e8f9f7 35 */
<> 144:ef7eb2e8f9f7 36 inline static void singleton_lock(void)
<> 144:ef7eb2e8f9f7 37 {
<> 144:ef7eb2e8f9f7 38 #ifdef MBED_CONF_RTOS_PRESENT
<> 144:ef7eb2e8f9f7 39 osMutexWait(singleton_mutex_id, osWaitForever);
<> 144:ef7eb2e8f9f7 40 #endif
<> 144:ef7eb2e8f9f7 41 }
<> 144:ef7eb2e8f9f7 42
<> 144:ef7eb2e8f9f7 43 /** Unlock the singleton mutex
<> 144:ef7eb2e8f9f7 44 *
<> 144:ef7eb2e8f9f7 45 * This function is typically used to provide
<> 144:ef7eb2e8f9f7 46 * exclusive access when initializing a
<> 144:ef7eb2e8f9f7 47 * global object.
<> 144:ef7eb2e8f9f7 48 */
<> 144:ef7eb2e8f9f7 49 inline static void singleton_unlock(void)
<> 144:ef7eb2e8f9f7 50 {
<> 144:ef7eb2e8f9f7 51 #ifdef MBED_CONF_RTOS_PRESENT
<> 144:ef7eb2e8f9f7 52 osMutexRelease (singleton_mutex_id);
<> 144:ef7eb2e8f9f7 53 #endif
<> 144:ef7eb2e8f9f7 54 }
<> 144:ef7eb2e8f9f7 55
<> 144:ef7eb2e8f9f7 56 /** Utility class for creating an using a singleton
<> 144:ef7eb2e8f9f7 57 *
<> 144:ef7eb2e8f9f7 58 * @Note Synchronization level: Thread safe
<> 144:ef7eb2e8f9f7 59 *
<> 144:ef7eb2e8f9f7 60 * @Note: This class must only be used in a static context -
<> 144:ef7eb2e8f9f7 61 * this class must never be allocated or created on the
<> 144:ef7eb2e8f9f7 62 * stack.
<> 144:ef7eb2e8f9f7 63 *
<> 144:ef7eb2e8f9f7 64 * @Note: This class is lazily initialized on first use.
<> 144:ef7eb2e8f9f7 65 * This class is a POD type so if it is not used it will
<> 144:ef7eb2e8f9f7 66 * be garbage collected.
<> 144:ef7eb2e8f9f7 67 */
<> 144:ef7eb2e8f9f7 68 template <class T>
<> 144:ef7eb2e8f9f7 69 struct SingletonPtr {
<> 144:ef7eb2e8f9f7 70
<> 144:ef7eb2e8f9f7 71 /** Get a pointer to the underlying singleton
<> 144:ef7eb2e8f9f7 72 *
<> 144:ef7eb2e8f9f7 73 * @returns
<> 144:ef7eb2e8f9f7 74 * A pointer to the singleton
<> 144:ef7eb2e8f9f7 75 */
<> 144:ef7eb2e8f9f7 76 T* get() {
<> 144:ef7eb2e8f9f7 77 if (NULL == _ptr) {
<> 144:ef7eb2e8f9f7 78 singleton_lock();
<> 144:ef7eb2e8f9f7 79 if (NULL == _ptr) {
<> 144:ef7eb2e8f9f7 80 _ptr = new (_data) T();
<> 144:ef7eb2e8f9f7 81 }
<> 144:ef7eb2e8f9f7 82 singleton_unlock();
<> 144:ef7eb2e8f9f7 83 }
<> 144:ef7eb2e8f9f7 84 // _ptr was not zero initialized or was
<> 144:ef7eb2e8f9f7 85 // corrupted if this assert is hit
<> 144:ef7eb2e8f9f7 86 MBED_ASSERT(_ptr == (T *)&_data);
<> 144:ef7eb2e8f9f7 87 return _ptr;
<> 144:ef7eb2e8f9f7 88 }
<> 144:ef7eb2e8f9f7 89
<> 144:ef7eb2e8f9f7 90 /** Get a pointer to the underlying singleton
<> 144:ef7eb2e8f9f7 91 *
<> 144:ef7eb2e8f9f7 92 * @returns
<> 144:ef7eb2e8f9f7 93 * A pointer to the singleton
<> 144:ef7eb2e8f9f7 94 */
<> 144:ef7eb2e8f9f7 95 T* operator->() {
<> 144:ef7eb2e8f9f7 96 return get();
<> 144:ef7eb2e8f9f7 97 }
<> 144:ef7eb2e8f9f7 98
<> 144:ef7eb2e8f9f7 99 // This is zero initialized when in global scope
<> 144:ef7eb2e8f9f7 100 T *_ptr;
<> 144:ef7eb2e8f9f7 101 // Force data to be 4 byte aligned
<> 144:ef7eb2e8f9f7 102 uint32_t _data[(sizeof(T) + sizeof(uint32_t) - 1) / sizeof(uint32_t)];
<> 144:ef7eb2e8f9f7 103 };
<> 144:ef7eb2e8f9f7 104
<> 144:ef7eb2e8f9f7 105 #endif