Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

drivers/InterruptManager.cpp@1:3deb71413561, 2017-07-20 (annotated)

Committer:
xuaner
Date:
Thu Jul 20 14:26:57 2017 +0000
Revision:
1:3deb71413561
Parent:
0:f269e3021894 
mbed_os

Who changed what in which revision?

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elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2006-2013 ARM Limited
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Licensed under the Apache License, Version 2.0 (the "License");
elessair 0:f269e3021894 5 * you may not use this file except in compliance with the License.
elessair 0:f269e3021894 6 * You may obtain a copy of the License at
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 9 *
elessair 0:f269e3021894 10 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 11 * distributed under the License is distributed on an "AS IS" BASIS,
elessair 0:f269e3021894 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 13 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 14 * limitations under the License.
elessair 0:f269e3021894 15 */
elessair 0:f269e3021894 16 #include "cmsis.h"
elessair 0:f269e3021894 17 #if defined(NVIC_NUM_VECTORS)
elessair 0:f269e3021894 18
elessair 0:f269e3021894 19 #include "drivers/InterruptManager.h"
elessair 0:f269e3021894 20 #include "platform/critical.h"
elessair 0:f269e3021894 21 #include <string.h>
elessair 0:f269e3021894 22
elessair 0:f269e3021894 23 #define CHAIN_INITIAL_SIZE 4
elessair 0:f269e3021894 24
elessair 0:f269e3021894 25 namespace mbed {
elessair 0:f269e3021894 26
elessair 0:f269e3021894 27 typedef void (*pvoidf)(void);
elessair 0:f269e3021894 28
elessair 0:f269e3021894 29 InterruptManager* InterruptManager::_instance = (InterruptManager*)NULL;
elessair 0:f269e3021894 30
elessair 0:f269e3021894 31 InterruptManager* InterruptManager::get() {
elessair 0:f269e3021894 32
elessair 0:f269e3021894 33 if (NULL == _instance) {
elessair 0:f269e3021894 34 InterruptManager* temp = new InterruptManager();
elessair 0:f269e3021894 35
elessair 0:f269e3021894 36 // Atomically set _instance
elessair 0:f269e3021894 37 core_util_critical_section_enter();
elessair 0:f269e3021894 38 if (NULL == _instance) {
elessair 0:f269e3021894 39 _instance = temp;
elessair 0:f269e3021894 40 }
elessair 0:f269e3021894 41 core_util_critical_section_exit();
elessair 0:f269e3021894 42
elessair 0:f269e3021894 43 // Another thread got there first so delete ours
elessair 0:f269e3021894 44 if (temp != _instance) {
elessair 0:f269e3021894 45 delete temp;
elessair 0:f269e3021894 46 }
elessair 0:f269e3021894 47
elessair 0:f269e3021894 48 }
elessair 0:f269e3021894 49 return _instance;
elessair 0:f269e3021894 50 }
elessair 0:f269e3021894 51
elessair 0:f269e3021894 52 InterruptManager::InterruptManager() {
elessair 0:f269e3021894 53 // No mutex needed in constructor
elessair 0:f269e3021894 54 memset(_chains, 0, NVIC_NUM_VECTORS * sizeof(CallChain*));
elessair 0:f269e3021894 55 }
elessair 0:f269e3021894 56
elessair 0:f269e3021894 57 void InterruptManager::destroy() {
elessair 0:f269e3021894 58 // Not a good idea to call this unless NO interrupt at all
elessair 0:f269e3021894 59 // is under the control of the handler; otherwise, a system crash
elessair 0:f269e3021894 60 // is very likely to occur
elessair 0:f269e3021894 61 if (NULL != _instance) {
elessair 0:f269e3021894 62 delete _instance;
elessair 0:f269e3021894 63 _instance = (InterruptManager*)NULL;
elessair 0:f269e3021894 64 }
elessair 0:f269e3021894 65 }
elessair 0:f269e3021894 66
elessair 0:f269e3021894 67 InterruptManager::~InterruptManager() {
elessair 0:f269e3021894 68 for(int i = 0; i < NVIC_NUM_VECTORS; i++)
elessair 0:f269e3021894 69 if (NULL != _chains[i])
elessair 0:f269e3021894 70 delete _chains[i];
elessair 0:f269e3021894 71 }
elessair 0:f269e3021894 72
elessair 0:f269e3021894 73 bool InterruptManager::must_replace_vector(IRQn_Type irq) {
elessair 0:f269e3021894 74 lock();
elessair 0:f269e3021894 75
elessair 0:f269e3021894 76 int ret = false;
elessair 0:f269e3021894 77 int irq_pos = get_irq_index(irq);
elessair 0:f269e3021894 78 if (NULL == _chains[irq_pos]) {
elessair 0:f269e3021894 79 _chains[irq_pos] = new CallChain(CHAIN_INITIAL_SIZE);
elessair 0:f269e3021894 80 _chains[irq_pos]->add((pvoidf)NVIC_GetVector(irq));
elessair 0:f269e3021894 81 ret = true;
elessair 0:f269e3021894 82 }
elessair 0:f269e3021894 83 unlock();
elessair 0:f269e3021894 84 return ret;
elessair 0:f269e3021894 85 }
elessair 0:f269e3021894 86
elessair 0:f269e3021894 87 pFunctionPointer_t InterruptManager::add_common(void (*function)(void), IRQn_Type irq, bool front) {
elessair 0:f269e3021894 88 lock();
elessair 0:f269e3021894 89 int irq_pos = get_irq_index(irq);
elessair 0:f269e3021894 90 bool change = must_replace_vector(irq);
elessair 0:f269e3021894 91
elessair 0:f269e3021894 92 pFunctionPointer_t pf = front ? _chains[irq_pos]->add_front(function) : _chains[irq_pos]->add(function);
elessair 0:f269e3021894 93 if (change)
elessair 0:f269e3021894 94 NVIC_SetVector(irq, (uint32_t)&InterruptManager::static_irq_helper);
elessair 0:f269e3021894 95 unlock();
elessair 0:f269e3021894 96 return pf;
elessair 0:f269e3021894 97 }
elessair 0:f269e3021894 98
elessair 0:f269e3021894 99 bool InterruptManager::remove_handler(pFunctionPointer_t handler, IRQn_Type irq) {
elessair 0:f269e3021894 100 int irq_pos = get_irq_index(irq);
elessair 0:f269e3021894 101 bool ret = false;
elessair 0:f269e3021894 102
elessair 0:f269e3021894 103 lock();
elessair 0:f269e3021894 104 if (_chains[irq_pos] != NULL) {
elessair 0:f269e3021894 105 if (_chains[irq_pos]->remove(handler)) {
elessair 0:f269e3021894 106 ret = true;
elessair 0:f269e3021894 107 }
elessair 0:f269e3021894 108 }
elessair 0:f269e3021894 109 unlock();
elessair 0:f269e3021894 110
elessair 0:f269e3021894 111 return ret;
elessair 0:f269e3021894 112 }
elessair 0:f269e3021894 113
elessair 0:f269e3021894 114 void InterruptManager::irq_helper() {
elessair 0:f269e3021894 115 _chains[__get_IPSR()]->call();
elessair 0:f269e3021894 116 }
elessair 0:f269e3021894 117
elessair 0:f269e3021894 118 int InterruptManager::get_irq_index(IRQn_Type irq) {
elessair 0:f269e3021894 119 // Pure function - no lock needed
elessair 0:f269e3021894 120 return (int)irq + NVIC_USER_IRQ_OFFSET;
elessair 0:f269e3021894 121 }
elessair 0:f269e3021894 122
elessair 0:f269e3021894 123 void InterruptManager::static_irq_helper() {
elessair 0:f269e3021894 124 InterruptManager::get()->irq_helper();
elessair 0:f269e3021894 125 }
elessair 0:f269e3021894 126
elessair 0:f269e3021894 127 void InterruptManager::lock() {
elessair 0:f269e3021894 128 _mutex.lock();
elessair 0:f269e3021894 129 }
elessair 0:f269e3021894 130
elessair 0:f269e3021894 131 void InterruptManager::unlock() {
elessair 0:f269e3021894 132 _mutex.unlock();
elessair 0:f269e3021894 133 }
elessair 0:f269e3021894 134
elessair 0:f269e3021894 135 } // namespace mbed
elessair 0:f269e3021894 136
elessair 0:f269e3021894 137 #endif