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InterruptIn.h
1 /* mbed Microcontroller Library
2  * Copyright (c) 2006-2013 ARM Limited
3  * SPDX-License-Identifier: Apache-2.0
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 #ifndef MBED_INTERRUPTIN_H
18 #define MBED_INTERRUPTIN_H
19 
20 #include "platform/platform.h"
21 
22 #if DEVICE_INTERRUPTIN || defined(DOXYGEN_ONLY)
23 
24 #include "hal/gpio_api.h"
25 #include "hal/gpio_irq_api.h"
26 #include "platform/Callback.h"
27 #include "platform/mbed_critical.h"
28 #include "platform/mbed_toolchain.h"
29 #include "platform/NonCopyable.h"
30 
31 namespace mbed {
32 /** \addtogroup drivers */
33 
34 /** A digital interrupt input, used to call a function on a rising or falling edge
35  *
36  * @note Synchronization level: Interrupt safe
37  *
38  * Example:
39  * @code
40  * // Flash an LED while waiting for events
41  *
42  * #include "mbed.h"
43  *
44  * InterruptIn event(p16);
45  * DigitalOut led(LED1);
46  *
47  * void trigger() {
48  * printf("triggered!\n");
49  * }
50  *
51  * int main() {
52  * // register trigger() to be called upon the rising edge of event
53  * event.rise(&trigger);
54  * while(1) {
55  * led = !led;
56  * wait(0.25);
57  * }
58  * }
59  * @endcode
60  * @ingroup drivers
61  */
62 class InterruptIn : private NonCopyable<InterruptIn> {
63 
64 public:
65 
66  /** Create an InterruptIn connected to the specified pin
67  *
68  * @param pin InterruptIn pin to connect to
69  */
70  InterruptIn(PinName pin);
71 
72  /** Create an InterruptIn connected to the specified pin,
73  * and the pin configured to the specified mode.
74  *
75  * @param pin InterruptIn pin to connect to
76  * @param mode Desired Pin mode configuration.
77  * (Valid values could be PullNone, PullDown, PullUp and PullDefault.
78  * See PinNames.h for your target for definitions)
79  *
80  */
81  InterruptIn(PinName pin, PinMode mode);
82 
83  virtual ~InterruptIn();
84 
85  /** Read the input, represented as 0 or 1 (int)
86  *
87  * @returns
88  * An integer representing the state of the input pin,
89  * 0 for logical 0, 1 for logical 1
90  */
91  int read();
92 
93  /** An operator shorthand for read()
94  */
95  operator int();
96 
97 
98  /** Attach a function to call when a rising edge occurs on the input
99  *
100  * @param func A pointer to a void function, or 0 to set as none
101  */
102  void rise(Callback<void()> func);
103 
104  /** Attach a member function to call when a rising edge occurs on the input
105  *
106  * @param obj pointer to the object to call the member function on
107  * @param method pointer to the member function to be called
108  * @deprecated
109  * The rise function does not support cv-qualifiers. Replaced by
110  * rise(callback(obj, method)).
111  */
112  template<typename T, typename M>
113  MBED_DEPRECATED_SINCE("mbed-os-5.1",
114  "The rise function does not support cv-qualifiers. Replaced by "
115  "rise(callback(obj, method)).")
116  void rise(T *obj, M method)
117  {
118  core_util_critical_section_enter();
119  rise(callback(obj, method));
120  core_util_critical_section_exit();
121  }
122 
123  /** Attach a function to call when a falling edge occurs on the input
124  *
125  * @param func A pointer to a void function, or 0 to set as none
126  */
127  void fall(Callback<void()> func);
128 
129  /** Attach a member function to call when a falling edge occurs on the input
130  *
131  * @param obj pointer to the object to call the member function on
132  * @param method pointer to the member function to be called
133  * @deprecated
134  * The rise function does not support cv-qualifiers. Replaced by
135  * rise(callback(obj, method)).
136  */
137  template<typename T, typename M>
138  MBED_DEPRECATED_SINCE("mbed-os-5.1",
139  "The fall function does not support cv-qualifiers. Replaced by "
140  "fall(callback(obj, method)).")
141  void fall(T *obj, M method)
142  {
143  core_util_critical_section_enter();
144  fall(callback(obj, method));
145  core_util_critical_section_exit();
146  }
147 
148  /** Set the input pin mode
149  *
150  * @param pull PullUp, PullDown, PullNone, PullDefault
151  * See PinNames.h for your target for definitions)
152  */
153  void mode(PinMode pull);
154 
155  /** Enable IRQ. This method depends on hardware implementation, might enable one
156  * port interrupts. For further information, check gpio_irq_enable().
157  */
158  void enable_irq();
159 
160  /** Disable IRQ. This method depends on hardware implementation, might disable one
161  * port interrupts. For further information, check gpio_irq_disable().
162  */
163  void disable_irq();
164 
165  static void _irq_handler(uint32_t id, gpio_irq_event event);
166 #if !defined(DOXYGEN_ONLY)
167 protected:
168  gpio_t gpio;
169  gpio_irq_t gpio_irq;
170 
171  Callback<void()> _rise;
172  Callback<void()> _fall;
173 
174  void irq_init(PinName pin);
175 #endif
176 };
177 
178 } // namespace mbed
179 
180 #endif
181 
182 #endif
mbed::InterruptIn::fall
void fall(Callback< void()> func)
Attach a function to call when a falling edge occurs on the input.
mbed::InterruptIn::mode
void mode(PinMode pull)
Set the input pin mode.
mbed::InterruptIn::disable_irq
void disable_irq()
Disable IRQ.
mbed::InterruptIn::enable_irq
void enable_irq()
Enable IRQ.
mbed::NonCopyable
Prevents generation of copy constructor and copy assignment operator in derived classes.
Definition: NonCopyable.h:168
gpio_irq_event
gpio_irq_event
GPIO IRQ events.
Definition: gpio_irq_api.h:33
mbed::callback
Callback< R()> callback(R(*func)()=0)
Create a callback class with type inferred from the arguments.
Definition: Callback.h:3848
core_util_critical_section_exit
void core_util_critical_section_exit(void)
Mark the end of a critical section.
gpio_irq_t
struct gpio_irq_s gpio_irq_t
GPIO IRQ HAL structure.
Definition: gpio_irq_api.h:41
mbed::InterruptIn::InterruptIn
InterruptIn(PinName pin)
Create an InterruptIn connected to the specified pin.
core_util_critical_section_enter
void core_util_critical_section_enter(void)
Mark the start of a critical section.
mbed::InterruptIn::read
int read()
Read the input, represented as 0 or 1 (int)
mbed::InterruptIn
A digital interrupt input, used to call a function on a rising or falling edge.
Definition: InterruptIn.h:62
mbed::InterruptIn::rise
void rise(Callback< void()> func)
Attach a function to call when a rising edge occurs on the input.
mbed::Callback
Callback class based on template specialization.
Definition: Callback.h:39
MBED_DEPRECATED_SINCE
#define MBED_DEPRECATED_SINCE(D, M)
MBED_DEPRECATED("message string") Mark a function declaration as deprecated, if it used then a warnin...
Definition: mbed_toolchain.h:379
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