tmk_core/tool/mbed/mbed-sdk/libraries/mbed/api/InterruptManager.h

   1 #ifndef MBED_INTERRUPTMANAGER_H
   2 #define MBED_INTERRUPTMANAGER_H
   3
   4 #include "cmsis.h"
   5 #include "CallChain.h"
   6 #include <string.h>
   7
   8 namespace mbed {
   9
  10 /** Use this singleton if you need to chain interrupt handlers.
  11  *
  12  * Example (for LPC1768):
  13  * @code
  14  * #include "InterruptManager.h"
  15  * #include "mbed.h"
  16  *
  17  * Ticker flipper;
  18  * DigitalOut led1(LED1);
  19  * DigitalOut led2(LED2);
  20  *
  21  * void flip(void) {
  22  *     led1 = !led1;
  23  * }
  24  *
  25  * void handler(void) {
  26  *     led2 = !led1;
  27  * }
  28  *
  29  * int main() {
  30  *     led1 = led2 = 0;
  31  *     flipper.attach(&flip, 1.0);
  32  *     InterruptManager::get()->add_handler(handler, TIMER3_IRQn);
  33  * }
  34  * @endcode
  35  */
  36 class InterruptManager {
  37 public:
  38     /** Return the only instance of this class
  39      */
  40     static InterruptManager* get();
  41
  42     /** Destroy the current instance of the interrupt manager
  43      */
  44     static void destroy();
  45
  46     /** Add a handler for an interrupt at the end of the handler list
  47      *
  48      *  @param function the handler to add
  49      *  @param irq interrupt number
  50      *
  51      *  @returns
  52      *  The function object created for 'function'
  53      */
  54     pFunctionPointer_t add_handler(void (*function)(void), IRQn_Type irq) {
  55         return add_common(function, irq);
  56     }
  57
  58     /** Add a handler for an interrupt at the beginning of the handler list
  59      *
  60      *  @param function the handler to add
  61      *  @param irq interrupt number
  62      *
  63      *  @returns
  64      *  The function object created for 'function'
  65      */
  66     pFunctionPointer_t add_handler_front(void (*function)(void), IRQn_Type irq) {
  67         return add_common(function, irq, true);
  68     }
  69
  70     /** Add a handler for an interrupt at the end of the handler list
  71      *
  72      *  @param tptr pointer to the object that has the handler function
  73      *  @param mptr pointer to the actual handler function
  74      *  @param irq interrupt number
  75      *
  76      *  @returns
  77      *  The function object created for 'tptr' and 'mptr'
  78      */
  79     template<typename T>
  80     pFunctionPointer_t add_handler(T* tptr, void (T::*mptr)(void), IRQn_Type irq) {
  81         return add_common(tptr, mptr, irq);
  82     }
  83
  84     /** Add a handler for an interrupt at the beginning of the handler list
  85      *
  86      *  @param tptr pointer to the object that has the handler function
  87      *  @param mptr pointer to the actual handler function
  88      *  @param irq interrupt number
  89      *
  90      *  @returns
  91      *  The function object created for 'tptr' and 'mptr'
  92      */
  93     template<typename T>
  94     pFunctionPointer_t add_handler_front(T* tptr, void (T::*mptr)(void), IRQn_Type irq) {
  95         return add_common(tptr, mptr, irq, true);
  96     }
  97
  98     /** Remove a handler from an interrupt
  99      *
 100      *  @param handler the function object for the handler to remove
 101      *  @param irq the interrupt number
 102      *
 103      *  @returns
 104      *  true if the handler was found and removed, false otherwise
 105      */
 106     bool remove_handler(pFunctionPointer_t handler, IRQn_Type irq);
 107
 108 private:
 109     InterruptManager();
 110     ~InterruptManager();
 111
 112     // We declare the copy contructor and the assignment operator, but we don't
 113     // implement them. This way, if someone tries to copy/assign our instance,
 114     // he will get an error at compile time.
 115     InterruptManager(const InterruptManager&);
 116     InterruptManager& operator =(const InterruptManager&);
 117
 118     template<typename T>
 119     pFunctionPointer_t add_common(T *tptr, void (T::*mptr)(void), IRQn_Type irq, bool front=false) {
 120         int irq_pos = get_irq_index(irq);
 121         bool change = must_replace_vector(irq);
 122
 123         pFunctionPointer_t pf = front ? _chains[irq_pos]->add_front(tptr, mptr) : _chains[irq_pos]->add(tptr, mptr);
 124         if (change)
 125             NVIC_SetVector(irq, (uint32_t)&InterruptManager::static_irq_helper);
 126         return pf;
 127     }
 128
 129     pFunctionPointer_t add_common(void (*function)(void), IRQn_Type irq, bool front=false);
 130     bool must_replace_vector(IRQn_Type irq);
 131     int get_irq_index(IRQn_Type irq);
 132     void irq_helper();
 133     void add_helper(void (*function)(void), IRQn_Type irq, bool front=false);
 134     static void static_irq_helper();
 135
 136     CallChain* _chains[NVIC_NUM_VECTORS];
 137     static InterruptManager* _instance;
 138 };
 139
 140 } // namespace mbed
 141
 142 #endif
 143