2 #if defined(NVIC_NUM_VECTORS)
4 #include "InterruptManager.h"
7 #define CHAIN_INITIAL_SIZE 4
11 typedef void (*pvoidf)(void);
13 InterruptManager* InterruptManager::_instance = (InterruptManager*)NULL;
15 InterruptManager* InterruptManager::get() {
16 if (NULL == _instance)
17 _instance = new InterruptManager();
21 InterruptManager::InterruptManager() {
22 memset(_chains, 0, NVIC_NUM_VECTORS * sizeof(CallChain*));
25 void InterruptManager::destroy() {
26 // Not a good idea to call this unless NO interrupt at all
27 // is under the control of the handler; otherwise, a system crash
28 // is very likely to occur
29 if (NULL != _instance) {
31 _instance = (InterruptManager*)NULL;
35 InterruptManager::~InterruptManager() {
36 for(int i = 0; i < NVIC_NUM_VECTORS; i++)
37 if (NULL != _chains[i])
41 bool InterruptManager::must_replace_vector(IRQn_Type irq) {
42 int irq_pos = get_irq_index(irq);
44 if (NULL == _chains[irq_pos]) {
45 _chains[irq_pos] = new CallChain(CHAIN_INITIAL_SIZE);
46 _chains[irq_pos]->add((pvoidf)NVIC_GetVector(irq));
52 pFunctionPointer_t InterruptManager::add_common(void (*function)(void), IRQn_Type irq, bool front) {
53 int irq_pos = get_irq_index(irq);
54 bool change = must_replace_vector(irq);
56 pFunctionPointer_t pf = front ? _chains[irq_pos]->add_front(function) : _chains[irq_pos]->add(function);
58 NVIC_SetVector(irq, (uint32_t)&InterruptManager::static_irq_helper);
62 bool InterruptManager::remove_handler(pFunctionPointer_t handler, IRQn_Type irq) {
63 int irq_pos = get_irq_index(irq);
65 if (NULL == _chains[irq_pos])
67 if (!_chains[irq_pos]->remove(handler))
69 // If there's a single function left in the chain, swith the interrupt vector
70 // to call that function directly. This way we save both time and space.
71 if (_chains[irq_pos]->size() == 1 && NULL != _chains[irq_pos]->get(0)->get_function()) {
72 NVIC_SetVector(irq, (uint32_t)_chains[irq_pos]->get(0)->get_function());
73 delete _chains[irq_pos];
74 _chains[irq_pos] = (CallChain*) NULL;
79 void InterruptManager::irq_helper() {
80 _chains[__get_IPSR()]->call();
83 int InterruptManager::get_irq_index(IRQn_Type irq) {
84 return (int)irq + NVIC_USER_IRQ_OFFSET;
87 void InterruptManager::static_irq_helper() {
88 InterruptManager::get()->irq_helper();