mirror of https://github.com/ARMmbed/mbed-os.git
158 lines
3.7 KiB
C++
158 lines
3.7 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "cmsis.h"
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#if defined(NVIC_NUM_VECTORS)
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// Suppress deprecation warnings since this whole
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// class is deprecated already
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#include "mbed_toolchain.h"
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#undef MBED_DEPRECATED_SINCE
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#define MBED_DEPRECATED_SINCE(...)
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#include "drivers/InterruptManager.h"
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#include "platform/mbed_critical.h"
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#include <string.h>
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#define CHAIN_INITIAL_SIZE 4
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namespace mbed {
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typedef void (*pvoidf)(void);
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InterruptManager *InterruptManager::_instance = (InterruptManager *)NULL;
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InterruptManager *InterruptManager::get()
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{
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if (NULL == _instance) {
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InterruptManager *temp = new InterruptManager();
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// Atomically set _instance
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core_util_critical_section_enter();
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if (NULL == _instance) {
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_instance = temp;
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}
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core_util_critical_section_exit();
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// Another thread got there first so delete ours
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if (temp != _instance) {
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delete temp;
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}
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}
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return _instance;
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}
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InterruptManager::InterruptManager()
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{
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// No mutex needed in constructor
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memset(_chains, 0, NVIC_NUM_VECTORS * sizeof(CallChain *));
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}
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void InterruptManager::destroy()
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{
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// Not a good idea to call this unless NO interrupt at all
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// is under the control of the handler; otherwise, a system crash
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// is very likely to occur
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if (NULL != _instance) {
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delete _instance;
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_instance = (InterruptManager *)NULL;
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}
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}
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InterruptManager::~InterruptManager()
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{
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for (int i = 0; i < NVIC_NUM_VECTORS; i++)
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if (NULL != _chains[i]) {
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delete _chains[i];
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}
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}
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bool InterruptManager::must_replace_vector(IRQn_Type irq)
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{
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lock();
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int ret = false;
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int irq_pos = get_irq_index(irq);
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if (NULL == _chains[irq_pos]) {
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_chains[irq_pos] = new CallChain(CHAIN_INITIAL_SIZE);
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_chains[irq_pos]->add((pvoidf)NVIC_GetVector(irq));
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ret = true;
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}
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unlock();
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return ret;
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}
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pFunctionPointer_t InterruptManager::add_common(void (*function)(void), IRQn_Type irq, bool front)
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{
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lock();
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int irq_pos = get_irq_index(irq);
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bool change = must_replace_vector(irq);
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pFunctionPointer_t pf = front ? _chains[irq_pos]->add_front(function) : _chains[irq_pos]->add(function);
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if (change) {
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NVIC_SetVector(irq, (uint32_t)&InterruptManager::static_irq_helper);
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}
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unlock();
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return pf;
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}
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bool InterruptManager::remove_handler(pFunctionPointer_t handler, IRQn_Type irq)
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{
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int irq_pos = get_irq_index(irq);
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bool ret = false;
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lock();
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if (_chains[irq_pos] != NULL) {
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if (_chains[irq_pos]->remove(handler)) {
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ret = true;
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}
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}
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unlock();
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return ret;
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}
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void InterruptManager::irq_helper()
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{
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_chains[__get_IPSR()]->call();
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}
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int InterruptManager::get_irq_index(IRQn_Type irq)
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{
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// Pure function - no lock needed
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return (int)irq + NVIC_USER_IRQ_OFFSET;
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}
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void InterruptManager::static_irq_helper()
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{
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InterruptManager::get()->irq_helper();
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}
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void InterruptManager::lock()
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{
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_mutex.lock();
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}
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void InterruptManager::unlock()
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{
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_mutex.unlock();
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}
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} // namespace mbed
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#endif
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