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mbed/drivers/InterruptIn.h@0:d6c9b09b4042, 2020-12-02 (annotated)

Committer:
annieluo2
Date:
Wed Dec 02 18:02:03 2020 +0000
Revision:
0:d6c9b09b4042
boo

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annieluo2 0:d6c9b09b4042 1 /* mbed Microcontroller Library
annieluo2 0:d6c9b09b4042 2 * Copyright (c) 2006-2013 ARM Limited
annieluo2 0:d6c9b09b4042 3 *
annieluo2 0:d6c9b09b4042 4 * Licensed under the Apache License, Version 2.0 (the "License");
annieluo2 0:d6c9b09b4042 5 * you may not use this file except in compliance with the License.
annieluo2 0:d6c9b09b4042 6 * You may obtain a copy of the License at
annieluo2 0:d6c9b09b4042 7 *
annieluo2 0:d6c9b09b4042 8 * http://www.apache.org/licenses/LICENSE-2.0
annieluo2 0:d6c9b09b4042 9 *
annieluo2 0:d6c9b09b4042 10 * Unless required by applicable law or agreed to in writing, software
annieluo2 0:d6c9b09b4042 11 * distributed under the License is distributed on an "AS IS" BASIS,
annieluo2 0:d6c9b09b4042 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
annieluo2 0:d6c9b09b4042 13 * See the License for the specific language governing permissions and
annieluo2 0:d6c9b09b4042 14 * limitations under the License.
annieluo2 0:d6c9b09b4042 15 */
annieluo2 0:d6c9b09b4042 16 #ifndef MBED_INTERRUPTIN_H
annieluo2 0:d6c9b09b4042 17 #define MBED_INTERRUPTIN_H
annieluo2 0:d6c9b09b4042 18
annieluo2 0:d6c9b09b4042 19 #include "platform/platform.h"
annieluo2 0:d6c9b09b4042 20
annieluo2 0:d6c9b09b4042 21 #if DEVICE_INTERRUPTIN
annieluo2 0:d6c9b09b4042 22
annieluo2 0:d6c9b09b4042 23 #include "hal/gpio_api.h"
annieluo2 0:d6c9b09b4042 24 #include "hal/gpio_irq_api.h"
annieluo2 0:d6c9b09b4042 25 #include "platform/Callback.h"
annieluo2 0:d6c9b09b4042 26 #include "platform/critical.h"
annieluo2 0:d6c9b09b4042 27 #include "platform/toolchain.h"
annieluo2 0:d6c9b09b4042 28
annieluo2 0:d6c9b09b4042 29 namespace mbed {
annieluo2 0:d6c9b09b4042 30 /** \addtogroup drivers */
annieluo2 0:d6c9b09b4042 31 /** @{*/
annieluo2 0:d6c9b09b4042 32
annieluo2 0:d6c9b09b4042 33 /** A digital interrupt input, used to call a function on a rising or falling edge
annieluo2 0:d6c9b09b4042 34 *
annieluo2 0:d6c9b09b4042 35 * @Note Synchronization level: Interrupt safe
annieluo2 0:d6c9b09b4042 36 *
annieluo2 0:d6c9b09b4042 37 * Example:
annieluo2 0:d6c9b09b4042 38 * @code
annieluo2 0:d6c9b09b4042 39 * // Flash an LED while waiting for events
annieluo2 0:d6c9b09b4042 40 *
annieluo2 0:d6c9b09b4042 41 * #include "mbed.h"
annieluo2 0:d6c9b09b4042 42 *
annieluo2 0:d6c9b09b4042 43 * InterruptIn event(p16);
annieluo2 0:d6c9b09b4042 44 * DigitalOut led(LED1);
annieluo2 0:d6c9b09b4042 45 *
annieluo2 0:d6c9b09b4042 46 * void trigger() {
annieluo2 0:d6c9b09b4042 47 * printf("triggered!\n");
annieluo2 0:d6c9b09b4042 48 * }
annieluo2 0:d6c9b09b4042 49 *
annieluo2 0:d6c9b09b4042 50 * int main() {
annieluo2 0:d6c9b09b4042 51 * event.rise(&trigger);
annieluo2 0:d6c9b09b4042 52 * while(1) {
annieluo2 0:d6c9b09b4042 53 * led = !led;
annieluo2 0:d6c9b09b4042 54 * wait(0.25);
annieluo2 0:d6c9b09b4042 55 * }
annieluo2 0:d6c9b09b4042 56 * }
annieluo2 0:d6c9b09b4042 57 * @endcode
annieluo2 0:d6c9b09b4042 58 */
annieluo2 0:d6c9b09b4042 59 class InterruptIn {
annieluo2 0:d6c9b09b4042 60
annieluo2 0:d6c9b09b4042 61 public:
annieluo2 0:d6c9b09b4042 62
annieluo2 0:d6c9b09b4042 63 /** Create an InterruptIn connected to the specified pin
annieluo2 0:d6c9b09b4042 64 *
annieluo2 0:d6c9b09b4042 65 * @param pin InterruptIn pin to connect to
annieluo2 0:d6c9b09b4042 66 * @param name (optional) A string to identify the object
annieluo2 0:d6c9b09b4042 67 */
annieluo2 0:d6c9b09b4042 68 InterruptIn(PinName pin);
annieluo2 0:d6c9b09b4042 69 virtual ~InterruptIn();
annieluo2 0:d6c9b09b4042 70
annieluo2 0:d6c9b09b4042 71 /** Read the input, represented as 0 or 1 (int)
annieluo2 0:d6c9b09b4042 72 *
annieluo2 0:d6c9b09b4042 73 * @returns
annieluo2 0:d6c9b09b4042 74 * An integer representing the state of the input pin,
annieluo2 0:d6c9b09b4042 75 * 0 for logical 0, 1 for logical 1
annieluo2 0:d6c9b09b4042 76 */
annieluo2 0:d6c9b09b4042 77 int read();
annieluo2 0:d6c9b09b4042 78
annieluo2 0:d6c9b09b4042 79 /** An operator shorthand for read()
annieluo2 0:d6c9b09b4042 80 */
annieluo2 0:d6c9b09b4042 81 operator int();
annieluo2 0:d6c9b09b4042 82
annieluo2 0:d6c9b09b4042 83
annieluo2 0:d6c9b09b4042 84 /** Attach a function to call when a rising edge occurs on the input
annieluo2 0:d6c9b09b4042 85 *
annieluo2 0:d6c9b09b4042 86 * @param func A pointer to a void function, or 0 to set as none
annieluo2 0:d6c9b09b4042 87 */
annieluo2 0:d6c9b09b4042 88 void rise(Callback<void()> func);
annieluo2 0:d6c9b09b4042 89
annieluo2 0:d6c9b09b4042 90 /** Attach a member function to call when a rising edge occurs on the input
annieluo2 0:d6c9b09b4042 91 *
annieluo2 0:d6c9b09b4042 92 * @param obj pointer to the object to call the member function on
annieluo2 0:d6c9b09b4042 93 * @param method pointer to the member function to be called
annieluo2 0:d6c9b09b4042 94 * @deprecated
annieluo2 0:d6c9b09b4042 95 * The rise function does not support cv-qualifiers. Replaced by
annieluo2 0:d6c9b09b4042 96 * rise(callback(obj, method)).
annieluo2 0:d6c9b09b4042 97 */
annieluo2 0:d6c9b09b4042 98 template<typename T, typename M>
annieluo2 0:d6c9b09b4042 99 MBED_DEPRECATED_SINCE("mbed-os-5.1",
annieluo2 0:d6c9b09b4042 100 "The rise function does not support cv-qualifiers. Replaced by "
annieluo2 0:d6c9b09b4042 101 "rise(callback(obj, method)).")
annieluo2 0:d6c9b09b4042 102 void rise(T *obj, M method) {
annieluo2 0:d6c9b09b4042 103 core_util_critical_section_enter();
annieluo2 0:d6c9b09b4042 104 rise(callback(obj, method));
annieluo2 0:d6c9b09b4042 105 core_util_critical_section_exit();
annieluo2 0:d6c9b09b4042 106 }
annieluo2 0:d6c9b09b4042 107
annieluo2 0:d6c9b09b4042 108 /** Attach a function to call when a falling edge occurs on the input
annieluo2 0:d6c9b09b4042 109 *
annieluo2 0:d6c9b09b4042 110 * @param func A pointer to a void function, or 0 to set as none
annieluo2 0:d6c9b09b4042 111 */
annieluo2 0:d6c9b09b4042 112 void fall(Callback<void()> func);
annieluo2 0:d6c9b09b4042 113
annieluo2 0:d6c9b09b4042 114 /** Attach a member function to call when a falling edge occurs on the input
annieluo2 0:d6c9b09b4042 115 *
annieluo2 0:d6c9b09b4042 116 * @param obj pointer to the object to call the member function on
annieluo2 0:d6c9b09b4042 117 * @param method pointer to the member function to be called
annieluo2 0:d6c9b09b4042 118 * @deprecated
annieluo2 0:d6c9b09b4042 119 * The rise function does not support cv-qualifiers. Replaced by
annieluo2 0:d6c9b09b4042 120 * rise(callback(obj, method)).
annieluo2 0:d6c9b09b4042 121 */
annieluo2 0:d6c9b09b4042 122 template<typename T, typename M>
annieluo2 0:d6c9b09b4042 123 MBED_DEPRECATED_SINCE("mbed-os-5.1",
annieluo2 0:d6c9b09b4042 124 "The fall function does not support cv-qualifiers. Replaced by "
annieluo2 0:d6c9b09b4042 125 "fall(callback(obj, method)).")
annieluo2 0:d6c9b09b4042 126 void fall(T *obj, M method) {
annieluo2 0:d6c9b09b4042 127 core_util_critical_section_enter();
annieluo2 0:d6c9b09b4042 128 fall(callback(obj, method));
annieluo2 0:d6c9b09b4042 129 core_util_critical_section_exit();
annieluo2 0:d6c9b09b4042 130 }
annieluo2 0:d6c9b09b4042 131
annieluo2 0:d6c9b09b4042 132 /** Set the input pin mode
annieluo2 0:d6c9b09b4042 133 *
annieluo2 0:d6c9b09b4042 134 * @param mode PullUp, PullDown, PullNone
annieluo2 0:d6c9b09b4042 135 */
annieluo2 0:d6c9b09b4042 136 void mode(PinMode pull);
annieluo2 0:d6c9b09b4042 137
annieluo2 0:d6c9b09b4042 138 /** Enable IRQ. This method depends on hw implementation, might enable one
annieluo2 0:d6c9b09b4042 139 * port interrupts. For further information, check gpio_irq_enable().
annieluo2 0:d6c9b09b4042 140 */
annieluo2 0:d6c9b09b4042 141 void enable_irq();
annieluo2 0:d6c9b09b4042 142
annieluo2 0:d6c9b09b4042 143 /** Disable IRQ. This method depends on hw implementation, might disable one
annieluo2 0:d6c9b09b4042 144 * port interrupts. For further information, check gpio_irq_disable().
annieluo2 0:d6c9b09b4042 145 */
annieluo2 0:d6c9b09b4042 146 void disable_irq();
annieluo2 0:d6c9b09b4042 147
annieluo2 0:d6c9b09b4042 148 static void _irq_handler(uint32_t id, gpio_irq_event event);
annieluo2 0:d6c9b09b4042 149
annieluo2 0:d6c9b09b4042 150 protected:
annieluo2 0:d6c9b09b4042 151 gpio_t gpio;
annieluo2 0:d6c9b09b4042 152 gpio_irq_t gpio_irq;
annieluo2 0:d6c9b09b4042 153
annieluo2 0:d6c9b09b4042 154 Callback<void()> _rise;
annieluo2 0:d6c9b09b4042 155 Callback<void()> _fall;
annieluo2 0:d6c9b09b4042 156 };
annieluo2 0:d6c9b09b4042 157
annieluo2 0:d6c9b09b4042 158 } // namespace mbed
annieluo2 0:d6c9b09b4042 159
annieluo2 0:d6c9b09b4042 160 #endif
annieluo2 0:d6c9b09b4042 161
annieluo2 0:d6c9b09b4042 162 #endif
annieluo2 0:d6c9b09b4042 163
annieluo2 0:d6c9b09b4042 164 /** @}*/