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mbed-os/drivers/InterruptIn.cpp@1:9c5af431a1f1, 2018-05-01 (annotated)

Committer:
gustavatmel
Date:
Tue May 01 15:47:08 2018 +0000
Revision:
1:9c5af431a1f1
sdf

Who changed what in which revision?

UserRevisionLine numberNew contents of line
gustavatmel 1:9c5af431a1f1 1 /* mbed Microcontroller Library
gustavatmel 1:9c5af431a1f1 2 * Copyright (c) 2006-2013 ARM Limited
gustavatmel 1:9c5af431a1f1 3 *
gustavatmel 1:9c5af431a1f1 4 * Licensed under the Apache License, Version 2.0 (the "License");
gustavatmel 1:9c5af431a1f1 5 * you may not use this file except in compliance with the License.
gustavatmel 1:9c5af431a1f1 6 * You may obtain a copy of the License at
gustavatmel 1:9c5af431a1f1 7 *
gustavatmel 1:9c5af431a1f1 8 * http://www.apache.org/licenses/LICENSE-2.0
gustavatmel 1:9c5af431a1f1 9 *
gustavatmel 1:9c5af431a1f1 10 * Unless required by applicable law or agreed to in writing, software
gustavatmel 1:9c5af431a1f1 11 * distributed under the License is distributed on an "AS IS" BASIS,
gustavatmel 1:9c5af431a1f1 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
gustavatmel 1:9c5af431a1f1 13 * See the License for the specific language governing permissions and
gustavatmel 1:9c5af431a1f1 14 * limitations under the License.
gustavatmel 1:9c5af431a1f1 15 */
gustavatmel 1:9c5af431a1f1 16 #include "drivers/InterruptIn.h"
gustavatmel 1:9c5af431a1f1 17
gustavatmel 1:9c5af431a1f1 18 #if DEVICE_INTERRUPTIN
gustavatmel 1:9c5af431a1f1 19
gustavatmel 1:9c5af431a1f1 20 namespace mbed {
gustavatmel 1:9c5af431a1f1 21
gustavatmel 1:9c5af431a1f1 22 // Note: This single-parameter constructor exists to maintain binary
gustavatmel 1:9c5af431a1f1 23 // compatibility.
gustavatmel 1:9c5af431a1f1 24 // If not for that, we could simplify by having only the 2-param
gustavatmel 1:9c5af431a1f1 25 // constructor, with a default value for the PinMode.
gustavatmel 1:9c5af431a1f1 26 InterruptIn::InterruptIn(PinName pin) : gpio(),
gustavatmel 1:9c5af431a1f1 27 gpio_irq(),
gustavatmel 1:9c5af431a1f1 28 _rise(NULL),
gustavatmel 1:9c5af431a1f1 29 _fall(NULL) {
gustavatmel 1:9c5af431a1f1 30 // No lock needed in the constructor
gustavatmel 1:9c5af431a1f1 31 irq_init(pin);
gustavatmel 1:9c5af431a1f1 32 gpio_init_in(&gpio, pin);
gustavatmel 1:9c5af431a1f1 33 }
gustavatmel 1:9c5af431a1f1 34
gustavatmel 1:9c5af431a1f1 35 InterruptIn::InterruptIn(PinName pin, PinMode mode) :
gustavatmel 1:9c5af431a1f1 36 gpio(),
gustavatmel 1:9c5af431a1f1 37 gpio_irq(),
gustavatmel 1:9c5af431a1f1 38 _rise(NULL),
gustavatmel 1:9c5af431a1f1 39 _fall(NULL) {
gustavatmel 1:9c5af431a1f1 40 // No lock needed in the constructor
gustavatmel 1:9c5af431a1f1 41 irq_init(pin);
gustavatmel 1:9c5af431a1f1 42 gpio_init_in_ex(&gpio, pin, mode);
gustavatmel 1:9c5af431a1f1 43 }
gustavatmel 1:9c5af431a1f1 44
gustavatmel 1:9c5af431a1f1 45 void InterruptIn::irq_init(PinName pin) {
gustavatmel 1:9c5af431a1f1 46 gpio_irq_init(&gpio_irq, pin, (&InterruptIn::_irq_handler), (uint32_t)this);
gustavatmel 1:9c5af431a1f1 47 }
gustavatmel 1:9c5af431a1f1 48
gustavatmel 1:9c5af431a1f1 49 InterruptIn::~InterruptIn() {
gustavatmel 1:9c5af431a1f1 50 // No lock needed in the destructor
gustavatmel 1:9c5af431a1f1 51 gpio_irq_free(&gpio_irq);
gustavatmel 1:9c5af431a1f1 52 }
gustavatmel 1:9c5af431a1f1 53
gustavatmel 1:9c5af431a1f1 54 int InterruptIn::read() {
gustavatmel 1:9c5af431a1f1 55 // Read only
gustavatmel 1:9c5af431a1f1 56 return gpio_read(&gpio);
gustavatmel 1:9c5af431a1f1 57 }
gustavatmel 1:9c5af431a1f1 58
gustavatmel 1:9c5af431a1f1 59 void InterruptIn::mode(PinMode pull) {
gustavatmel 1:9c5af431a1f1 60 core_util_critical_section_enter();
gustavatmel 1:9c5af431a1f1 61 gpio_mode(&gpio, pull);
gustavatmel 1:9c5af431a1f1 62 core_util_critical_section_exit();
gustavatmel 1:9c5af431a1f1 63 }
gustavatmel 1:9c5af431a1f1 64
gustavatmel 1:9c5af431a1f1 65 void InterruptIn::rise(Callback<void()> func) {
gustavatmel 1:9c5af431a1f1 66 core_util_critical_section_enter();
gustavatmel 1:9c5af431a1f1 67 if (func) {
gustavatmel 1:9c5af431a1f1 68 _rise = func;
gustavatmel 1:9c5af431a1f1 69 gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
gustavatmel 1:9c5af431a1f1 70 } else {
gustavatmel 1:9c5af431a1f1 71 _rise = NULL;
gustavatmel 1:9c5af431a1f1 72 gpio_irq_set(&gpio_irq, IRQ_RISE, 0);
gustavatmel 1:9c5af431a1f1 73 }
gustavatmel 1:9c5af431a1f1 74 core_util_critical_section_exit();
gustavatmel 1:9c5af431a1f1 75 }
gustavatmel 1:9c5af431a1f1 76
gustavatmel 1:9c5af431a1f1 77 void InterruptIn::fall(Callback<void()> func) {
gustavatmel 1:9c5af431a1f1 78 core_util_critical_section_enter();
gustavatmel 1:9c5af431a1f1 79 if (func) {
gustavatmel 1:9c5af431a1f1 80 _fall = func;
gustavatmel 1:9c5af431a1f1 81 gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
gustavatmel 1:9c5af431a1f1 82 } else {
gustavatmel 1:9c5af431a1f1 83 _fall = NULL;
gustavatmel 1:9c5af431a1f1 84 gpio_irq_set(&gpio_irq, IRQ_FALL, 0);
gustavatmel 1:9c5af431a1f1 85 }
gustavatmel 1:9c5af431a1f1 86 core_util_critical_section_exit();
gustavatmel 1:9c5af431a1f1 87 }
gustavatmel 1:9c5af431a1f1 88
gustavatmel 1:9c5af431a1f1 89 void InterruptIn::_irq_handler(uint32_t id, gpio_irq_event event) {
gustavatmel 1:9c5af431a1f1 90 InterruptIn *handler = (InterruptIn*)id;
gustavatmel 1:9c5af431a1f1 91 switch (event) {
gustavatmel 1:9c5af431a1f1 92 case IRQ_RISE:
gustavatmel 1:9c5af431a1f1 93 if (handler->_rise) {
gustavatmel 1:9c5af431a1f1 94 handler->_rise();
gustavatmel 1:9c5af431a1f1 95 }
gustavatmel 1:9c5af431a1f1 96 break;
gustavatmel 1:9c5af431a1f1 97 case IRQ_FALL:
gustavatmel 1:9c5af431a1f1 98 if (handler->_fall) {
gustavatmel 1:9c5af431a1f1 99 handler->_fall();
gustavatmel 1:9c5af431a1f1 100 }
gustavatmel 1:9c5af431a1f1 101 break;
gustavatmel 1:9c5af431a1f1 102 case IRQ_NONE: break;
gustavatmel 1:9c5af431a1f1 103 }
gustavatmel 1:9c5af431a1f1 104 }
gustavatmel 1:9c5af431a1f1 105
gustavatmel 1:9c5af431a1f1 106 void InterruptIn::enable_irq() {
gustavatmel 1:9c5af431a1f1 107 core_util_critical_section_enter();
gustavatmel 1:9c5af431a1f1 108 gpio_irq_enable(&gpio_irq);
gustavatmel 1:9c5af431a1f1 109 core_util_critical_section_exit();
gustavatmel 1:9c5af431a1f1 110 }
gustavatmel 1:9c5af431a1f1 111
gustavatmel 1:9c5af431a1f1 112 void InterruptIn::disable_irq() {
gustavatmel 1:9c5af431a1f1 113 core_util_critical_section_enter();
gustavatmel 1:9c5af431a1f1 114 gpio_irq_disable(&gpio_irq);
gustavatmel 1:9c5af431a1f1 115 core_util_critical_section_exit();
gustavatmel 1:9c5af431a1f1 116 }
gustavatmel 1:9c5af431a1f1 117
gustavatmel 1:9c5af431a1f1 118 InterruptIn::operator int() {
gustavatmel 1:9c5af431a1f1 119 // Underlying call is atomic
gustavatmel 1:9c5af431a1f1 120 return read();
gustavatmel 1:9c5af431a1f1 121 }
gustavatmel 1:9c5af431a1f1 122
gustavatmel 1:9c5af431a1f1 123 } // namespace mbed
gustavatmel 1:9c5af431a1f1 124
gustavatmel 1:9c5af431a1f1 125 #endif