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

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2013 ARM Limited
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 #ifndef MBED_INTERRUPTIN_H
  17 #define MBED_INTERRUPTIN_H
  18
  19 #include "platform.h"
  20
  21 #if DEVICE_INTERRUPTIN
  22
  23 #include "gpio_api.h"
  24 #include "gpio_irq_api.h"
  25 #include "FunctionPointer.h"
  26
  27 namespace mbed {
  28
  29 /** A digital interrupt input, used to call a function on a rising or falling edge
  30  *
  31  * Example:
  32  * @code
  33  * // Flash an LED while waiting for events
  34  *
  35  * #include "mbed.h"
  36  *
  37  * InterruptIn event(p16);
  38  * DigitalOut led(LED1);
  39  *
  40  * void trigger() {
  41  *     printf("triggered!\n");
  42  * }
  43  *
  44  * int main() {
  45  *     event.rise(&trigger);
  46  *     while(1) {
  47  *         led = !led;
  48  *         wait(0.25);
  49  *     }
  50  * }
  51  * @endcode
  52  */
  53 class InterruptIn {
  54
  55 public:
  56
  57     /** Create an InterruptIn connected to the specified pin
  58      *
  59      *  @param pin InterruptIn pin to connect to
  60      *  @param name (optional) A string to identify the object
  61      */
  62     InterruptIn(PinName pin);
  63     virtual ~InterruptIn();
  64
  65      int read();
  66 #ifdef MBED_OPERATORS
  67     operator int();
  68
  69 #endif
  70
  71     /** Attach a function to call when a rising edge occurs on the input
  72      *
  73      *  @param fptr A pointer to a void function, or 0 to set as none
  74      */
  75     void rise(void (*fptr)(void));
  76
  77     /** Attach a member function to call when a rising edge occurs on the input
  78      *
  79      *  @param tptr pointer to the object to call the member function on
  80      *  @param mptr pointer to the member function to be called
  81      */
  82     template<typename T>
  83     void rise(T* tptr, void (T::*mptr)(void)) {
  84         _rise.attach(tptr, mptr);
  85         gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
  86     }
  87
  88     /** Attach a function to call when a falling edge occurs on the input
  89      *
  90      *  @param fptr A pointer to a void function, or 0 to set as none
  91      */
  92     void fall(void (*fptr)(void));
  93
  94     /** Attach a member function to call when a falling edge occurs on the input
  95      *
  96      *  @param tptr pointer to the object to call the member function on
  97      *  @param mptr pointer to the member function to be called
  98      */
  99     template<typename T>
 100     void fall(T* tptr, void (T::*mptr)(void)) {
 101         _fall.attach(tptr, mptr);
 102         gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
 103     }
 104
 105     /** Set the input pin mode
 106      *
 107      *  @param mode PullUp, PullDown, PullNone
 108      */
 109     void mode(PinMode pull);
 110
 111     /** Enable IRQ. This method depends on hw implementation, might enable one
 112      *  port interrupts. For further information, check gpio_irq_enable().
 113      */
 114     void enable_irq();
 115
 116     /** Disable IRQ. This method depends on hw implementation, might disable one
 117      *  port interrupts. For further information, check gpio_irq_disable().
 118      */
 119     void disable_irq();
 120
 121     static void _irq_handler(uint32_t id, gpio_irq_event event);
 122
 123 protected:
 124     gpio_t gpio;
 125     gpio_irq_t gpio_irq;
 126
 127     FunctionPointer _rise;
 128     FunctionPointer _fall;
 129 };
 130
 131 } // namespace mbed
 132
 133 #endif
 134
 135 #endif