Diff: common/InterruptManager.cpp

Revision:

15:4892fe388435

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/common/InterruptManager.cpp	Wed Aug 07 16:43:59 2013 +0300
@@ -0,0 +1,89 @@
+#include "InterruptManager.h"
+#include <string.h>
+
+#define CHAIN_INITIAL_SIZE    4
+
+namespace mbed {
+
+typedef void (*pvoidf)(void);
+
+InterruptManager* InterruptManager::_instance = NULL;
+
+InterruptManager* InterruptManager::get() {
+    if (NULL == _instance)
+        _instance = new InterruptManager();
+    return _instance;
+}
+
+InterruptManager::InterruptManager() {
+    memset(_chains, 0, NVIC_NUM_VECTORS * sizeof(CallChain*));
+}
+
+void InterruptManager::destroy() {
+    // Not a good idea to call this unless NO interrupt at all
+    // is under the control of the handler; otherwise, a system crash
+    // is very likely to occur
+    if (NULL != _instance) {
+        delete _instance;
+        _instance = NULL;
+    }
+}
+
+InterruptManager::~InterruptManager() {
+    for(int i = 0; i < NVIC_NUM_VECTORS; i++)
+        if (NULL != _chains[i])
+            delete _chains[i];
+}
+
+bool InterruptManager::must_replace_vector(IRQn_Type irq) {
+    int irq_pos = get_irq_index(irq);
+
+    if (NULL == _chains[irq_pos]) {
+        _chains[irq_pos] = new CallChain(CHAIN_INITIAL_SIZE);
+        _chains[irq_pos]->add((pvoidf)NVIC_GetVector(irq));
+        return true;
+    }
+    return false;
+}
+
+pFunctionPointer_t InterruptManager::add_common(void (*function)(void), IRQn_Type irq, bool front) {
+    int irq_pos = get_irq_index(irq);
+    bool change = must_replace_vector(irq);
+
+    pFunctionPointer_t pf = front ? _chains[irq_pos]->add_front(function) : _chains[irq_pos]->add(function);
+    if (change)
+        NVIC_SetVector(irq, (uint32_t)&InterruptManager::static_irq_helper);
+    return pf;
+}
+
+bool InterruptManager::remove_handler(pFunctionPointer_t handler, IRQn_Type irq) {
+    int irq_pos = get_irq_index(irq);
+    
+    if (NULL == _chains[irq_pos])
+        return false;
+    if (!_chains[irq_pos]->remove(handler))
+        return false;
+    // If there's a single function left in the chain, swith the interrupt vector
+    // to call that function directly. This way we save both time and space.
+    if (_chains[irq_pos]->size() == 1 && NULL != _chains[irq_pos]->get(0)->get_function()) {
+        NVIC_SetVector(irq, (uint32_t)_chains[irq_pos]->get(0)->get_function());
+        delete _chains[irq_pos];
+        _chains[irq_pos] = NULL;
+    }
+    return true;
+}
+
+void InterruptManager::irq_helper() {
+    _chains[__get_IPSR()]->call();
+}
+
+int InterruptManager::get_irq_index(IRQn_Type irq) {
+    return (int)irq + NVIC_USER_IRQ_OFFSET;
+}
+
+void InterruptManager::static_irq_helper() {
+    InterruptManager::get()->irq_helper();
+}
+
+} // namespace mbed
+