Mateusz Kowalik / Application

USB Serial application

Fork of USBSerial_HelloWorld by Samuel Mokrani

mbed-dev/drivers/InterruptManager.cpp@11:b3f2a8bdac4d, 2017-12-16 (annotated)

Committer:
Zaitsev
Date:
Sat Dec 16 10:26:48 2017 +0000
Revision:
11:b3f2a8bdac4d
Parent:
10:41552d038a69 
A copy for D.S;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Zaitsev 10:41552d038a69 1 /* mbed Microcontroller Library
Zaitsev 10:41552d038a69 2 * Copyright (c) 2006-2013 ARM Limited
Zaitsev 10:41552d038a69 3 *
Zaitsev 10:41552d038a69 4 * Licensed under the Apache License, Version 2.0 (the "License");
Zaitsev 10:41552d038a69 5 * you may not use this file except in compliance with the License.
Zaitsev 10:41552d038a69 6 * You may obtain a copy of the License at
Zaitsev 10:41552d038a69 7 *
Zaitsev 10:41552d038a69 8 * http://www.apache.org/licenses/LICENSE-2.0
Zaitsev 10:41552d038a69 9 *
Zaitsev 10:41552d038a69 10 * Unless required by applicable law or agreed to in writing, software
Zaitsev 10:41552d038a69 11 * distributed under the License is distributed on an "AS IS" BASIS,
Zaitsev 10:41552d038a69 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Zaitsev 10:41552d038a69 13 * See the License for the specific language governing permissions and
Zaitsev 10:41552d038a69 14 * limitations under the License.
Zaitsev 10:41552d038a69 15 */
Zaitsev 10:41552d038a69 16 #include "cmsis.h"
Zaitsev 10:41552d038a69 17 #if defined(NVIC_NUM_VECTORS)
Zaitsev 10:41552d038a69 18
Zaitsev 10:41552d038a69 19 #include "drivers/InterruptManager.h"
Zaitsev 10:41552d038a69 20 #include "platform/critical.h"
Zaitsev 10:41552d038a69 21 #include <string.h>
Zaitsev 10:41552d038a69 22
Zaitsev 10:41552d038a69 23 #define CHAIN_INITIAL_SIZE 4
Zaitsev 10:41552d038a69 24
Zaitsev 10:41552d038a69 25 namespace mbed {
Zaitsev 10:41552d038a69 26
Zaitsev 10:41552d038a69 27 typedef void (*pvoidf)(void);
Zaitsev 10:41552d038a69 28
Zaitsev 10:41552d038a69 29 InterruptManager* InterruptManager::_instance = (InterruptManager*)NULL;
Zaitsev 10:41552d038a69 30
Zaitsev 10:41552d038a69 31 InterruptManager* InterruptManager::get() {
Zaitsev 10:41552d038a69 32
Zaitsev 10:41552d038a69 33 if (NULL == _instance) {
Zaitsev 10:41552d038a69 34 InterruptManager* temp = new InterruptManager();
Zaitsev 10:41552d038a69 35
Zaitsev 10:41552d038a69 36 // Atomically set _instance
Zaitsev 10:41552d038a69 37 core_util_critical_section_enter();
Zaitsev 10:41552d038a69 38 if (NULL == _instance) {
Zaitsev 10:41552d038a69 39 _instance = temp;
Zaitsev 10:41552d038a69 40 }
Zaitsev 10:41552d038a69 41 core_util_critical_section_exit();
Zaitsev 10:41552d038a69 42
Zaitsev 10:41552d038a69 43 // Another thread got there first so delete ours
Zaitsev 10:41552d038a69 44 if (temp != _instance) {
Zaitsev 10:41552d038a69 45 delete temp;
Zaitsev 10:41552d038a69 46 }
Zaitsev 10:41552d038a69 47
Zaitsev 10:41552d038a69 48 }
Zaitsev 10:41552d038a69 49 return _instance;
Zaitsev 10:41552d038a69 50 }
Zaitsev 10:41552d038a69 51
Zaitsev 10:41552d038a69 52 InterruptManager::InterruptManager() {
Zaitsev 10:41552d038a69 53 // No mutex needed in constructor
Zaitsev 10:41552d038a69 54 memset(_chains, 0, NVIC_NUM_VECTORS * sizeof(CallChain*));
Zaitsev 10:41552d038a69 55 }
Zaitsev 10:41552d038a69 56
Zaitsev 10:41552d038a69 57 void InterruptManager::destroy() {
Zaitsev 10:41552d038a69 58 // Not a good idea to call this unless NO interrupt at all
Zaitsev 10:41552d038a69 59 // is under the control of the handler; otherwise, a system crash
Zaitsev 10:41552d038a69 60 // is very likely to occur
Zaitsev 10:41552d038a69 61 if (NULL != _instance) {
Zaitsev 10:41552d038a69 62 delete _instance;
Zaitsev 10:41552d038a69 63 _instance = (InterruptManager*)NULL;
Zaitsev 10:41552d038a69 64 }
Zaitsev 10:41552d038a69 65 }
Zaitsev 10:41552d038a69 66
Zaitsev 10:41552d038a69 67 InterruptManager::~InterruptManager() {
Zaitsev 10:41552d038a69 68 for(int i = 0; i < NVIC_NUM_VECTORS; i++)
Zaitsev 10:41552d038a69 69 if (NULL != _chains[i])
Zaitsev 10:41552d038a69 70 delete _chains[i];
Zaitsev 10:41552d038a69 71 }
Zaitsev 10:41552d038a69 72
Zaitsev 10:41552d038a69 73 bool InterruptManager::must_replace_vector(IRQn_Type irq) {
Zaitsev 10:41552d038a69 74 lock();
Zaitsev 10:41552d038a69 75
Zaitsev 10:41552d038a69 76 int ret = false;
Zaitsev 10:41552d038a69 77 int irq_pos = get_irq_index(irq);
Zaitsev 10:41552d038a69 78 if (NULL == _chains[irq_pos]) {
Zaitsev 10:41552d038a69 79 _chains[irq_pos] = new CallChain(CHAIN_INITIAL_SIZE);
Zaitsev 10:41552d038a69 80 _chains[irq_pos]->add((pvoidf)NVIC_GetVector(irq));
Zaitsev 10:41552d038a69 81 ret = true;
Zaitsev 10:41552d038a69 82 }
Zaitsev 10:41552d038a69 83 unlock();
Zaitsev 10:41552d038a69 84 return ret;
Zaitsev 10:41552d038a69 85 }
Zaitsev 10:41552d038a69 86
Zaitsev 10:41552d038a69 87 pFunctionPointer_t InterruptManager::add_common(void (*function)(void), IRQn_Type irq, bool front) {
Zaitsev 10:41552d038a69 88 lock();
Zaitsev 10:41552d038a69 89 int irq_pos = get_irq_index(irq);
Zaitsev 10:41552d038a69 90 bool change = must_replace_vector(irq);
Zaitsev 10:41552d038a69 91
Zaitsev 10:41552d038a69 92 pFunctionPointer_t pf = front ? _chains[irq_pos]->add_front(function) : _chains[irq_pos]->add(function);
Zaitsev 10:41552d038a69 93 if (change)
Zaitsev 10:41552d038a69 94 NVIC_SetVector(irq, (uint32_t)&InterruptManager::static_irq_helper);
Zaitsev 10:41552d038a69 95 unlock();
Zaitsev 10:41552d038a69 96 return pf;
Zaitsev 10:41552d038a69 97 }
Zaitsev 10:41552d038a69 98
Zaitsev 10:41552d038a69 99 bool InterruptManager::remove_handler(pFunctionPointer_t handler, IRQn_Type irq) {
Zaitsev 10:41552d038a69 100 int irq_pos = get_irq_index(irq);
Zaitsev 10:41552d038a69 101 bool ret = false;
Zaitsev 10:41552d038a69 102
Zaitsev 10:41552d038a69 103 lock();
Zaitsev 10:41552d038a69 104 if (_chains[irq_pos] != NULL) {
Zaitsev 10:41552d038a69 105 if (_chains[irq_pos]->remove(handler)) {
Zaitsev 10:41552d038a69 106 ret = true;
Zaitsev 10:41552d038a69 107 }
Zaitsev 10:41552d038a69 108 }
Zaitsev 10:41552d038a69 109 unlock();
Zaitsev 10:41552d038a69 110
Zaitsev 10:41552d038a69 111 return ret;
Zaitsev 10:41552d038a69 112 }
Zaitsev 10:41552d038a69 113
Zaitsev 10:41552d038a69 114 void InterruptManager::irq_helper() {
Zaitsev 10:41552d038a69 115 _chains[__get_IPSR()]->call();
Zaitsev 10:41552d038a69 116 }
Zaitsev 10:41552d038a69 117
Zaitsev 10:41552d038a69 118 int InterruptManager::get_irq_index(IRQn_Type irq) {
Zaitsev 10:41552d038a69 119 // Pure function - no lock needed
Zaitsev 10:41552d038a69 120 return (int)irq + NVIC_USER_IRQ_OFFSET;
Zaitsev 10:41552d038a69 121 }
Zaitsev 10:41552d038a69 122
Zaitsev 10:41552d038a69 123 void InterruptManager::static_irq_helper() {
Zaitsev 10:41552d038a69 124 InterruptManager::get()->irq_helper();
Zaitsev 10:41552d038a69 125 }
Zaitsev 10:41552d038a69 126
Zaitsev 10:41552d038a69 127 void InterruptManager::lock() {
Zaitsev 10:41552d038a69 128 _mutex.lock();
Zaitsev 10:41552d038a69 129 }
Zaitsev 10:41552d038a69 130
Zaitsev 10:41552d038a69 131 void InterruptManager::unlock() {
Zaitsev 10:41552d038a69 132 _mutex.unlock();
Zaitsev 10:41552d038a69 133 }
Zaitsev 10:41552d038a69 134
Zaitsev 10:41552d038a69 135 } // namespace mbed
Zaitsev 10:41552d038a69 136
Zaitsev 10:41552d038a69 137 #endif