Marco Zecchini / Mbed OS Example_RTOS

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mbed-os/drivers/InterruptManager.cpp@0:9fca2b23d0ba, 2019-02-23 (annotated)

Committer:
marcozecchini
Date:
Sat Feb 23 12:13:36 2019 +0000
Revision:
0:9fca2b23d0ba
final commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
marcozecchini 0:9fca2b23d0ba 1 /* mbed Microcontroller Library
marcozecchini 0:9fca2b23d0ba 2 * Copyright (c) 2006-2013 ARM Limited
marcozecchini 0:9fca2b23d0ba 3 *
marcozecchini 0:9fca2b23d0ba 4 * Licensed under the Apache License, Version 2.0 (the "License");
marcozecchini 0:9fca2b23d0ba 5 * you may not use this file except in compliance with the License.
marcozecchini 0:9fca2b23d0ba 6 * You may obtain a copy of the License at
marcozecchini 0:9fca2b23d0ba 7 *
marcozecchini 0:9fca2b23d0ba 8 * http://www.apache.org/licenses/LICENSE-2.0
marcozecchini 0:9fca2b23d0ba 9 *
marcozecchini 0:9fca2b23d0ba 10 * Unless required by applicable law or agreed to in writing, software
marcozecchini 0:9fca2b23d0ba 11 * distributed under the License is distributed on an "AS IS" BASIS,
marcozecchini 0:9fca2b23d0ba 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
marcozecchini 0:9fca2b23d0ba 13 * See the License for the specific language governing permissions and
marcozecchini 0:9fca2b23d0ba 14 * limitations under the License.
marcozecchini 0:9fca2b23d0ba 15 */
marcozecchini 0:9fca2b23d0ba 16 #include "cmsis.h"
marcozecchini 0:9fca2b23d0ba 17 #if defined(NVIC_NUM_VECTORS)
marcozecchini 0:9fca2b23d0ba 18
marcozecchini 0:9fca2b23d0ba 19 // Suppress deprecation warnings since this whole
marcozecchini 0:9fca2b23d0ba 20 // class is deprecated already
marcozecchini 0:9fca2b23d0ba 21 #include "mbed_toolchain.h"
marcozecchini 0:9fca2b23d0ba 22 #undef MBED_DEPRECATED_SINCE
marcozecchini 0:9fca2b23d0ba 23 #define MBED_DEPRECATED_SINCE(...)
marcozecchini 0:9fca2b23d0ba 24
marcozecchini 0:9fca2b23d0ba 25 #include "drivers/InterruptManager.h"
marcozecchini 0:9fca2b23d0ba 26 #include "platform/mbed_critical.h"
marcozecchini 0:9fca2b23d0ba 27 #include <string.h>
marcozecchini 0:9fca2b23d0ba 28
marcozecchini 0:9fca2b23d0ba 29 #define CHAIN_INITIAL_SIZE 4
marcozecchini 0:9fca2b23d0ba 30
marcozecchini 0:9fca2b23d0ba 31 namespace mbed {
marcozecchini 0:9fca2b23d0ba 32
marcozecchini 0:9fca2b23d0ba 33 typedef void (*pvoidf)(void);
marcozecchini 0:9fca2b23d0ba 34
marcozecchini 0:9fca2b23d0ba 35 InterruptManager* InterruptManager::_instance = (InterruptManager*)NULL;
marcozecchini 0:9fca2b23d0ba 36
marcozecchini 0:9fca2b23d0ba 37 InterruptManager* InterruptManager::get() {
marcozecchini 0:9fca2b23d0ba 38
marcozecchini 0:9fca2b23d0ba 39 if (NULL == _instance) {
marcozecchini 0:9fca2b23d0ba 40 InterruptManager* temp = new InterruptManager();
marcozecchini 0:9fca2b23d0ba 41
marcozecchini 0:9fca2b23d0ba 42 // Atomically set _instance
marcozecchini 0:9fca2b23d0ba 43 core_util_critical_section_enter();
marcozecchini 0:9fca2b23d0ba 44 if (NULL == _instance) {
marcozecchini 0:9fca2b23d0ba 45 _instance = temp;
marcozecchini 0:9fca2b23d0ba 46 }
marcozecchini 0:9fca2b23d0ba 47 core_util_critical_section_exit();
marcozecchini 0:9fca2b23d0ba 48
marcozecchini 0:9fca2b23d0ba 49 // Another thread got there first so delete ours
marcozecchini 0:9fca2b23d0ba 50 if (temp != _instance) {
marcozecchini 0:9fca2b23d0ba 51 delete temp;
marcozecchini 0:9fca2b23d0ba 52 }
marcozecchini 0:9fca2b23d0ba 53
marcozecchini 0:9fca2b23d0ba 54 }
marcozecchini 0:9fca2b23d0ba 55 return _instance;
marcozecchini 0:9fca2b23d0ba 56 }
marcozecchini 0:9fca2b23d0ba 57
marcozecchini 0:9fca2b23d0ba 58 InterruptManager::InterruptManager() {
marcozecchini 0:9fca2b23d0ba 59 // No mutex needed in constructor
marcozecchini 0:9fca2b23d0ba 60 memset(_chains, 0, NVIC_NUM_VECTORS * sizeof(CallChain*));
marcozecchini 0:9fca2b23d0ba 61 }
marcozecchini 0:9fca2b23d0ba 62
marcozecchini 0:9fca2b23d0ba 63 void InterruptManager::destroy() {
marcozecchini 0:9fca2b23d0ba 64 // Not a good idea to call this unless NO interrupt at all
marcozecchini 0:9fca2b23d0ba 65 // is under the control of the handler; otherwise, a system crash
marcozecchini 0:9fca2b23d0ba 66 // is very likely to occur
marcozecchini 0:9fca2b23d0ba 67 if (NULL != _instance) {
marcozecchini 0:9fca2b23d0ba 68 delete _instance;
marcozecchini 0:9fca2b23d0ba 69 _instance = (InterruptManager*)NULL;
marcozecchini 0:9fca2b23d0ba 70 }
marcozecchini 0:9fca2b23d0ba 71 }
marcozecchini 0:9fca2b23d0ba 72
marcozecchini 0:9fca2b23d0ba 73 InterruptManager::~InterruptManager() {
marcozecchini 0:9fca2b23d0ba 74 for(int i = 0; i < NVIC_NUM_VECTORS; i++)
marcozecchini 0:9fca2b23d0ba 75 if (NULL != _chains[i])
marcozecchini 0:9fca2b23d0ba 76 delete _chains[i];
marcozecchini 0:9fca2b23d0ba 77 }
marcozecchini 0:9fca2b23d0ba 78
marcozecchini 0:9fca2b23d0ba 79 bool InterruptManager::must_replace_vector(IRQn_Type irq) {
marcozecchini 0:9fca2b23d0ba 80 lock();
marcozecchini 0:9fca2b23d0ba 81
marcozecchini 0:9fca2b23d0ba 82 int ret = false;
marcozecchini 0:9fca2b23d0ba 83 int irq_pos = get_irq_index(irq);
marcozecchini 0:9fca2b23d0ba 84 if (NULL == _chains[irq_pos]) {
marcozecchini 0:9fca2b23d0ba 85 _chains[irq_pos] = new CallChain(CHAIN_INITIAL_SIZE);
marcozecchini 0:9fca2b23d0ba 86 _chains[irq_pos]->add((pvoidf)NVIC_GetVector(irq));
marcozecchini 0:9fca2b23d0ba 87 ret = true;
marcozecchini 0:9fca2b23d0ba 88 }
marcozecchini 0:9fca2b23d0ba 89 unlock();
marcozecchini 0:9fca2b23d0ba 90 return ret;
marcozecchini 0:9fca2b23d0ba 91 }
marcozecchini 0:9fca2b23d0ba 92
marcozecchini 0:9fca2b23d0ba 93 pFunctionPointer_t InterruptManager::add_common(void (*function)(void), IRQn_Type irq, bool front) {
marcozecchini 0:9fca2b23d0ba 94 lock();
marcozecchini 0:9fca2b23d0ba 95 int irq_pos = get_irq_index(irq);
marcozecchini 0:9fca2b23d0ba 96 bool change = must_replace_vector(irq);
marcozecchini 0:9fca2b23d0ba 97
marcozecchini 0:9fca2b23d0ba 98 pFunctionPointer_t pf = front ? _chains[irq_pos]->add_front(function) : _chains[irq_pos]->add(function);
marcozecchini 0:9fca2b23d0ba 99 if (change)
marcozecchini 0:9fca2b23d0ba 100 NVIC_SetVector(irq, (uint32_t)&InterruptManager::static_irq_helper);
marcozecchini 0:9fca2b23d0ba 101 unlock();
marcozecchini 0:9fca2b23d0ba 102 return pf;
marcozecchini 0:9fca2b23d0ba 103 }
marcozecchini 0:9fca2b23d0ba 104
marcozecchini 0:9fca2b23d0ba 105 bool InterruptManager::remove_handler(pFunctionPointer_t handler, IRQn_Type irq) {
marcozecchini 0:9fca2b23d0ba 106 int irq_pos = get_irq_index(irq);
marcozecchini 0:9fca2b23d0ba 107 bool ret = false;
marcozecchini 0:9fca2b23d0ba 108
marcozecchini 0:9fca2b23d0ba 109 lock();
marcozecchini 0:9fca2b23d0ba 110 if (_chains[irq_pos] != NULL) {
marcozecchini 0:9fca2b23d0ba 111 if (_chains[irq_pos]->remove(handler)) {
marcozecchini 0:9fca2b23d0ba 112 ret = true;
marcozecchini 0:9fca2b23d0ba 113 }
marcozecchini 0:9fca2b23d0ba 114 }
marcozecchini 0:9fca2b23d0ba 115 unlock();
marcozecchini 0:9fca2b23d0ba 116
marcozecchini 0:9fca2b23d0ba 117 return ret;
marcozecchini 0:9fca2b23d0ba 118 }
marcozecchini 0:9fca2b23d0ba 119
marcozecchini 0:9fca2b23d0ba 120 void InterruptManager::irq_helper() {
marcozecchini 0:9fca2b23d0ba 121 _chains[__get_IPSR()]->call();
marcozecchini 0:9fca2b23d0ba 122 }
marcozecchini 0:9fca2b23d0ba 123
marcozecchini 0:9fca2b23d0ba 124 int InterruptManager::get_irq_index(IRQn_Type irq) {
marcozecchini 0:9fca2b23d0ba 125 // Pure function - no lock needed
marcozecchini 0:9fca2b23d0ba 126 return (int)irq + NVIC_USER_IRQ_OFFSET;
marcozecchini 0:9fca2b23d0ba 127 }
marcozecchini 0:9fca2b23d0ba 128
marcozecchini 0:9fca2b23d0ba 129 void InterruptManager::static_irq_helper() {
marcozecchini 0:9fca2b23d0ba 130 InterruptManager::get()->irq_helper();
marcozecchini 0:9fca2b23d0ba 131 }
marcozecchini 0:9fca2b23d0ba 132
marcozecchini 0:9fca2b23d0ba 133 void InterruptManager::lock() {
marcozecchini 0:9fca2b23d0ba 134 _mutex.lock();
marcozecchini 0:9fca2b23d0ba 135 }
marcozecchini 0:9fca2b23d0ba 136
marcozecchini 0:9fca2b23d0ba 137 void InterruptManager::unlock() {
marcozecchini 0:9fca2b23d0ba 138 _mutex.unlock();
marcozecchini 0:9fca2b23d0ba 139 }
marcozecchini 0:9fca2b23d0ba 140
marcozecchini 0:9fca2b23d0ba 141 } // namespace mbed
marcozecchini 0:9fca2b23d0ba 142
marcozecchini 0:9fca2b23d0ba 143 #endif