Lee Kai Xuan / mbed-os

mbed-os

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drivers/InterruptIn.cpp@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

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elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2006-2013 ARM Limited
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Licensed under the Apache License, Version 2.0 (the "License");
elessair 0:f269e3021894 5 * you may not use this file except in compliance with the License.
elessair 0:f269e3021894 6 * You may obtain a copy of the License at
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 9 *
elessair 0:f269e3021894 10 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 11 * distributed under the License is distributed on an "AS IS" BASIS,
elessair 0:f269e3021894 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 13 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 14 * limitations under the License.
elessair 0:f269e3021894 15 */
elessair 0:f269e3021894 16 #include "drivers/InterruptIn.h"
elessair 0:f269e3021894 17
elessair 0:f269e3021894 18 #if DEVICE_INTERRUPTIN
elessair 0:f269e3021894 19
elessair 0:f269e3021894 20 namespace mbed {
elessair 0:f269e3021894 21
elessair 0:f269e3021894 22 static void donothing() {}
elessair 0:f269e3021894 23
elessair 0:f269e3021894 24 InterruptIn::InterruptIn(PinName pin) : gpio(),
elessair 0:f269e3021894 25 gpio_irq(),
elessair 0:f269e3021894 26 _rise(),
elessair 0:f269e3021894 27 _fall() {
elessair 0:f269e3021894 28 // No lock needed in the constructor
elessair 0:f269e3021894 29
elessair 0:f269e3021894 30 _rise.attach(donothing);
elessair 0:f269e3021894 31 _fall.attach(donothing);
elessair 0:f269e3021894 32
elessair 0:f269e3021894 33 gpio_irq_init(&gpio_irq, pin, (&InterruptIn::_irq_handler), (uint32_t)this);
elessair 0:f269e3021894 34 gpio_init_in(&gpio, pin);
elessair 0:f269e3021894 35 }
elessair 0:f269e3021894 36
elessair 0:f269e3021894 37 InterruptIn::~InterruptIn() {
elessair 0:f269e3021894 38 // No lock needed in the destructor
elessair 0:f269e3021894 39 gpio_irq_free(&gpio_irq);
elessair 0:f269e3021894 40 }
elessair 0:f269e3021894 41
elessair 0:f269e3021894 42 int InterruptIn::read() {
elessair 0:f269e3021894 43 // Read only
elessair 0:f269e3021894 44 return gpio_read(&gpio);
elessair 0:f269e3021894 45 }
elessair 0:f269e3021894 46
elessair 0:f269e3021894 47 void InterruptIn::mode(PinMode pull) {
elessair 0:f269e3021894 48 core_util_critical_section_enter();
elessair 0:f269e3021894 49 gpio_mode(&gpio, pull);
elessair 0:f269e3021894 50 core_util_critical_section_exit();
elessair 0:f269e3021894 51 }
elessair 0:f269e3021894 52
elessair 0:f269e3021894 53 void InterruptIn::rise(Callback<void()> func) {
elessair 0:f269e3021894 54 core_util_critical_section_enter();
elessair 0:f269e3021894 55 if (func) {
elessair 0:f269e3021894 56 _rise.attach(func);
elessair 0:f269e3021894 57 gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
elessair 0:f269e3021894 58 } else {
elessair 0:f269e3021894 59 _rise.attach(donothing);
elessair 0:f269e3021894 60 gpio_irq_set(&gpio_irq, IRQ_RISE, 0);
elessair 0:f269e3021894 61 }
elessair 0:f269e3021894 62 core_util_critical_section_exit();
elessair 0:f269e3021894 63 }
elessair 0:f269e3021894 64
elessair 0:f269e3021894 65 void InterruptIn::fall(Callback<void()> func) {
elessair 0:f269e3021894 66 core_util_critical_section_enter();
elessair 0:f269e3021894 67 if (func) {
elessair 0:f269e3021894 68 _fall.attach(func);
elessair 0:f269e3021894 69 gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
elessair 0:f269e3021894 70 } else {
elessair 0:f269e3021894 71 _fall.attach(donothing);
elessair 0:f269e3021894 72 gpio_irq_set(&gpio_irq, IRQ_FALL, 0);
elessair 0:f269e3021894 73 }
elessair 0:f269e3021894 74 core_util_critical_section_exit();
elessair 0:f269e3021894 75 }
elessair 0:f269e3021894 76
elessair 0:f269e3021894 77 void InterruptIn::_irq_handler(uint32_t id, gpio_irq_event event) {
elessair 0:f269e3021894 78 InterruptIn *handler = (InterruptIn*)id;
elessair 0:f269e3021894 79 switch (event) {
elessair 0:f269e3021894 80 case IRQ_RISE: handler->_rise.call(); break;
elessair 0:f269e3021894 81 case IRQ_FALL: handler->_fall.call(); break;
elessair 0:f269e3021894 82 case IRQ_NONE: break;
elessair 0:f269e3021894 83 }
elessair 0:f269e3021894 84 }
elessair 0:f269e3021894 85
elessair 0:f269e3021894 86 void InterruptIn::enable_irq() {
elessair 0:f269e3021894 87 core_util_critical_section_enter();
elessair 0:f269e3021894 88 gpio_irq_enable(&gpio_irq);
elessair 0:f269e3021894 89 core_util_critical_section_exit();
elessair 0:f269e3021894 90 }
elessair 0:f269e3021894 91
elessair 0:f269e3021894 92 void InterruptIn::disable_irq() {
elessair 0:f269e3021894 93 core_util_critical_section_enter();
elessair 0:f269e3021894 94 gpio_irq_disable(&gpio_irq);
elessair 0:f269e3021894 95 core_util_critical_section_exit();
elessair 0:f269e3021894 96 }
elessair 0:f269e3021894 97
elessair 0:f269e3021894 98 InterruptIn::operator int() {
elessair 0:f269e3021894 99 // Underlying call is atomic
elessair 0:f269e3021894 100 return read();
elessair 0:f269e3021894 101 }
elessair 0:f269e3021894 102
elessair 0:f269e3021894 103 } // namespace mbed
elessair 0:f269e3021894 104
elessair 0:f269e3021894 105 #endif