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/* mbed Microcontroller Library
* Copyright (c) 2006-2013 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef MBED_INTERRUPTMANAGER_H
#define MBED_INTERRUPTMANAGER_H
#include "cmsis.h"
#include "platform/CallChain.h"
#include "platform/PlatformMutex.h"
#include <string.h>
namespace mbed {
/** \addtogroup drivers */
/** @{*/
/** Use this singleton if you need to chain interrupt handlers.
*
* @Note Synchronization level: Thread safe
*
* Example (for LPC1768):
* @code
* #include "InterruptManager.h"
* #include "mbed.h"
*
* Ticker flipper;
* DigitalOut led1(LED1);
* DigitalOut led2(LED2);
*
* void flip(void) {
* led1 = !led1;
* }
*
* void handler(void) {
* led2 = !led1;
* }
*
* int main() {
* led1 = led2 = 0;
* flipper.attach(&flip, 1.0);
* InterruptManager::get()->add_handler(handler, TIMER3_IRQn);
* }
* @endcode
*/
class InterruptManager {
public:
/** Return the only instance of this class
*/
static InterruptManager* get();
/** Destroy the current instance of the interrupt manager
*/
static void destroy();
/** Add a handler for an interrupt at the end of the handler list
*
* @param function the handler to add
* @param irq interrupt number
*
* @returns
* The function object created for 'function'
*/
pFunctionPointer_t add_handler(void (*function)(void), IRQn_Type irq) {
// Underlying call is thread safe
return add_common(function, irq);
}
/** Add a handler for an interrupt at the beginning of the handler list
*
* @param function the handler to add
* @param irq interrupt number
*
* @returns
* The function object created for 'function'
*/
pFunctionPointer_t add_handler_front(void (*function)(void), IRQn_Type irq) {
// Underlying call is thread safe
return add_common(function, irq, true);
}
/** Add a handler for an interrupt at the end of the handler list
*
* @param tptr pointer to the object that has the handler function
* @param mptr pointer to the actual handler function
* @param irq interrupt number
*
* @returns
* The function object created for 'tptr' and 'mptr'
*/
template<typename T>
pFunctionPointer_t add_handler(T* tptr, void (T::*mptr)(void), IRQn_Type irq) {
// Underlying call is thread safe
return add_common(tptr, mptr, irq);
}
/** Add a handler for an interrupt at the beginning of the handler list
*
* @param tptr pointer to the object that has the handler function
* @param mptr pointer to the actual handler function
* @param irq interrupt number
*
* @returns
* The function object created for 'tptr' and 'mptr'
*/
template<typename T>
pFunctionPointer_t add_handler_front(T* tptr, void (T::*mptr)(void), IRQn_Type irq) {
// Underlying call is thread safe
return add_common(tptr, mptr, irq, true);
}
/** Remove a handler from an interrupt
*
* @param handler the function object for the handler to remove
* @param irq the interrupt number
*
* @returns
* true if the handler was found and removed, false otherwise
*/
bool remove_handler(pFunctionPointer_t handler, IRQn_Type irq);
private:
InterruptManager();
~InterruptManager();
void lock();
void unlock();
// We declare the copy contructor and the assignment operator, but we don't
// implement them. This way, if someone tries to copy/assign our instance,
// he will get an error at compile time.
InterruptManager(const InterruptManager&);
InterruptManager& operator =(const InterruptManager&);
template<typename T>
pFunctionPointer_t add_common(T *tptr, void (T::*mptr)(void), IRQn_Type irq, bool front=false) {
_mutex.lock();
int irq_pos = get_irq_index(irq);
bool change = must_replace_vector(irq);
pFunctionPointer_t pf = front ? _chains[irq_pos]->add_front(tptr, mptr) : _chains[irq_pos]->add(tptr, mptr);
if (change)
NVIC_SetVector(irq, (uint32_t)&InterruptManager::static_irq_helper);
_mutex.unlock();
return pf;
}
pFunctionPointer_t add_common(void (*function)(void), IRQn_Type irq, bool front=false);
bool must_replace_vector(IRQn_Type irq);
int get_irq_index(IRQn_Type irq);
void irq_helper();
void add_helper(void (*function)(void), IRQn_Type irq, bool front=false);
static void static_irq_helper();
CallChain* _chains[NVIC_NUM_VECTORS];
static InterruptManager* _instance;
PlatformMutex _mutex;
};
} // namespace mbed
#endif
/** @}*/
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