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mbed-dev/drivers/InterruptIn.cpp@1:d0dfbce63a89, 2017-02-24 (annotated)

Committer:
elmot
Date:
Fri Feb 24 21:13:56 2017 +0000
Revision:
1:d0dfbce63a89
Ready-to-copy

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elmot 1:d0dfbce63a89 1 /* mbed Microcontroller Library
elmot 1:d0dfbce63a89 2 * Copyright (c) 2006-2013 ARM Limited
elmot 1:d0dfbce63a89 3 *
elmot 1:d0dfbce63a89 4 * Licensed under the Apache License, Version 2.0 (the "License");
elmot 1:d0dfbce63a89 5 * you may not use this file except in compliance with the License.
elmot 1:d0dfbce63a89 6 * You may obtain a copy of the License at
elmot 1:d0dfbce63a89 7 *
elmot 1:d0dfbce63a89 8 * http://www.apache.org/licenses/LICENSE-2.0
elmot 1:d0dfbce63a89 9 *
elmot 1:d0dfbce63a89 10 * Unless required by applicable law or agreed to in writing, software
elmot 1:d0dfbce63a89 11 * distributed under the License is distributed on an "AS IS" BASIS,
elmot 1:d0dfbce63a89 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elmot 1:d0dfbce63a89 13 * See the License for the specific language governing permissions and
elmot 1:d0dfbce63a89 14 * limitations under the License.
elmot 1:d0dfbce63a89 15 */
elmot 1:d0dfbce63a89 16 #include "drivers/InterruptIn.h"
elmot 1:d0dfbce63a89 17
elmot 1:d0dfbce63a89 18 #if DEVICE_INTERRUPTIN
elmot 1:d0dfbce63a89 19
elmot 1:d0dfbce63a89 20 namespace mbed {
elmot 1:d0dfbce63a89 21
elmot 1:d0dfbce63a89 22 static void donothing() {}
elmot 1:d0dfbce63a89 23
elmot 1:d0dfbce63a89 24 InterruptIn::InterruptIn(PinName pin) : gpio(),
elmot 1:d0dfbce63a89 25 gpio_irq(),
elmot 1:d0dfbce63a89 26 _rise(),
elmot 1:d0dfbce63a89 27 _fall() {
elmot 1:d0dfbce63a89 28 // No lock needed in the constructor
elmot 1:d0dfbce63a89 29
elmot 1:d0dfbce63a89 30 _rise.attach(donothing);
elmot 1:d0dfbce63a89 31 _fall.attach(donothing);
elmot 1:d0dfbce63a89 32
elmot 1:d0dfbce63a89 33 gpio_irq_init(&gpio_irq, pin, (&InterruptIn::_irq_handler), (uint32_t)this);
elmot 1:d0dfbce63a89 34 gpio_init_in(&gpio, pin);
elmot 1:d0dfbce63a89 35 }
elmot 1:d0dfbce63a89 36
elmot 1:d0dfbce63a89 37 InterruptIn::~InterruptIn() {
elmot 1:d0dfbce63a89 38 // No lock needed in the destructor
elmot 1:d0dfbce63a89 39 gpio_irq_free(&gpio_irq);
elmot 1:d0dfbce63a89 40 }
elmot 1:d0dfbce63a89 41
elmot 1:d0dfbce63a89 42 int InterruptIn::read() {
elmot 1:d0dfbce63a89 43 // Read only
elmot 1:d0dfbce63a89 44 return gpio_read(&gpio);
elmot 1:d0dfbce63a89 45 }
elmot 1:d0dfbce63a89 46
elmot 1:d0dfbce63a89 47 void InterruptIn::mode(PinMode pull) {
elmot 1:d0dfbce63a89 48 core_util_critical_section_enter();
elmot 1:d0dfbce63a89 49 gpio_mode(&gpio, pull);
elmot 1:d0dfbce63a89 50 core_util_critical_section_exit();
elmot 1:d0dfbce63a89 51 }
elmot 1:d0dfbce63a89 52
elmot 1:d0dfbce63a89 53 void InterruptIn::rise(Callback<void()> func) {
elmot 1:d0dfbce63a89 54 core_util_critical_section_enter();
elmot 1:d0dfbce63a89 55 if (func) {
elmot 1:d0dfbce63a89 56 _rise.attach(func);
elmot 1:d0dfbce63a89 57 gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
elmot 1:d0dfbce63a89 58 } else {
elmot 1:d0dfbce63a89 59 _rise.attach(donothing);
elmot 1:d0dfbce63a89 60 gpio_irq_set(&gpio_irq, IRQ_RISE, 0);
elmot 1:d0dfbce63a89 61 }
elmot 1:d0dfbce63a89 62 core_util_critical_section_exit();
elmot 1:d0dfbce63a89 63 }
elmot 1:d0dfbce63a89 64
elmot 1:d0dfbce63a89 65 void InterruptIn::fall(Callback<void()> func) {
elmot 1:d0dfbce63a89 66 core_util_critical_section_enter();
elmot 1:d0dfbce63a89 67 if (func) {
elmot 1:d0dfbce63a89 68 _fall.attach(func);
elmot 1:d0dfbce63a89 69 gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
elmot 1:d0dfbce63a89 70 } else {
elmot 1:d0dfbce63a89 71 _fall.attach(donothing);
elmot 1:d0dfbce63a89 72 gpio_irq_set(&gpio_irq, IRQ_FALL, 0);
elmot 1:d0dfbce63a89 73 }
elmot 1:d0dfbce63a89 74 core_util_critical_section_exit();
elmot 1:d0dfbce63a89 75 }
elmot 1:d0dfbce63a89 76
elmot 1:d0dfbce63a89 77 void InterruptIn::_irq_handler(uint32_t id, gpio_irq_event event) {
elmot 1:d0dfbce63a89 78 InterruptIn *handler = (InterruptIn*)id;
elmot 1:d0dfbce63a89 79 switch (event) {
elmot 1:d0dfbce63a89 80 case IRQ_RISE: handler->_rise.call(); break;
elmot 1:d0dfbce63a89 81 case IRQ_FALL: handler->_fall.call(); break;
elmot 1:d0dfbce63a89 82 case IRQ_NONE: break;
elmot 1:d0dfbce63a89 83 }
elmot 1:d0dfbce63a89 84 }
elmot 1:d0dfbce63a89 85
elmot 1:d0dfbce63a89 86 void InterruptIn::enable_irq() {
elmot 1:d0dfbce63a89 87 core_util_critical_section_enter();
elmot 1:d0dfbce63a89 88 gpio_irq_enable(&gpio_irq);
elmot 1:d0dfbce63a89 89 core_util_critical_section_exit();
elmot 1:d0dfbce63a89 90 }
elmot 1:d0dfbce63a89 91
elmot 1:d0dfbce63a89 92 void InterruptIn::disable_irq() {
elmot 1:d0dfbce63a89 93 core_util_critical_section_enter();
elmot 1:d0dfbce63a89 94 gpio_irq_disable(&gpio_irq);
elmot 1:d0dfbce63a89 95 core_util_critical_section_exit();
elmot 1:d0dfbce63a89 96 }
elmot 1:d0dfbce63a89 97
elmot 1:d0dfbce63a89 98 InterruptIn::operator int() {
elmot 1:d0dfbce63a89 99 // Underlying call is atomic
elmot 1:d0dfbce63a89 100 return read();
elmot 1:d0dfbce63a89 101 }
elmot 1:d0dfbce63a89 102
elmot 1:d0dfbce63a89 103 } // namespace mbed
elmot 1:d0dfbce63a89 104
elmot 1:d0dfbce63a89 105 #endif