John Karatka / mbed

mbed

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drivers/InterruptIn.cpp@182:57724642e740, 2018-02-16 (annotated)

Committer:
AnnaBridge
Date:
Fri Feb 16 16:09:33 2018 +0000
Revision:
182:57724642e740
Parent:
176:af195413fb11 
mbed-dev library. Release version 159.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2006-2013 ARM Limited
<> 149:156823d33999 3 *
<> 149:156823d33999 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 149:156823d33999 5 * you may not use this file except in compliance with the License.
<> 149:156823d33999 6 * You may obtain a copy of the License at
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 9 *
<> 149:156823d33999 10 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 149:156823d33999 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 13 * See the License for the specific language governing permissions and
<> 149:156823d33999 14 * limitations under the License.
<> 149:156823d33999 15 */
<> 149:156823d33999 16 #include "drivers/InterruptIn.h"
<> 149:156823d33999 17
<> 149:156823d33999 18 #if DEVICE_INTERRUPTIN
<> 149:156823d33999 19
<> 149:156823d33999 20 namespace mbed {
<> 149:156823d33999 21
<> 149:156823d33999 22 InterruptIn::InterruptIn(PinName pin) : gpio(),
<> 149:156823d33999 23 gpio_irq(),
AnnaBridge 176:af195413fb11 24 _rise(NULL),
AnnaBridge 176:af195413fb11 25 _fall(NULL) {
<> 149:156823d33999 26 // No lock needed in the constructor
<> 149:156823d33999 27
<> 149:156823d33999 28 gpio_irq_init(&gpio_irq, pin, (&InterruptIn::_irq_handler), (uint32_t)this);
<> 149:156823d33999 29 gpio_init_in(&gpio, pin);
<> 149:156823d33999 30 }
<> 149:156823d33999 31
<> 149:156823d33999 32 InterruptIn::~InterruptIn() {
<> 149:156823d33999 33 // No lock needed in the destructor
<> 149:156823d33999 34 gpio_irq_free(&gpio_irq);
<> 149:156823d33999 35 }
<> 149:156823d33999 36
<> 149:156823d33999 37 int InterruptIn::read() {
<> 149:156823d33999 38 // Read only
<> 149:156823d33999 39 return gpio_read(&gpio);
<> 149:156823d33999 40 }
<> 149:156823d33999 41
<> 149:156823d33999 42 void InterruptIn::mode(PinMode pull) {
<> 149:156823d33999 43 core_util_critical_section_enter();
<> 149:156823d33999 44 gpio_mode(&gpio, pull);
<> 149:156823d33999 45 core_util_critical_section_exit();
<> 149:156823d33999 46 }
<> 149:156823d33999 47
<> 149:156823d33999 48 void InterruptIn::rise(Callback<void()> func) {
<> 149:156823d33999 49 core_util_critical_section_enter();
<> 149:156823d33999 50 if (func) {
<> 160:d5399cc887bb 51 _rise = func;
<> 149:156823d33999 52 gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
<> 149:156823d33999 53 } else {
AnnaBridge 176:af195413fb11 54 _rise = NULL;
<> 149:156823d33999 55 gpio_irq_set(&gpio_irq, IRQ_RISE, 0);
<> 149:156823d33999 56 }
<> 149:156823d33999 57 core_util_critical_section_exit();
<> 149:156823d33999 58 }
<> 149:156823d33999 59
<> 149:156823d33999 60 void InterruptIn::fall(Callback<void()> func) {
<> 149:156823d33999 61 core_util_critical_section_enter();
<> 149:156823d33999 62 if (func) {
<> 160:d5399cc887bb 63 _fall = func;
<> 149:156823d33999 64 gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
<> 149:156823d33999 65 } else {
AnnaBridge 176:af195413fb11 66 _fall = NULL;
<> 149:156823d33999 67 gpio_irq_set(&gpio_irq, IRQ_FALL, 0);
<> 149:156823d33999 68 }
<> 149:156823d33999 69 core_util_critical_section_exit();
<> 149:156823d33999 70 }
<> 149:156823d33999 71
<> 149:156823d33999 72 void InterruptIn::_irq_handler(uint32_t id, gpio_irq_event event) {
<> 149:156823d33999 73 InterruptIn *handler = (InterruptIn*)id;
<> 149:156823d33999 74 switch (event) {
AnnaBridge 176:af195413fb11 75 case IRQ_RISE:
AnnaBridge 176:af195413fb11 76 if (handler->_rise) {
AnnaBridge 176:af195413fb11 77 handler->_rise();
AnnaBridge 176:af195413fb11 78 }
AnnaBridge 176:af195413fb11 79 break;
AnnaBridge 176:af195413fb11 80 case IRQ_FALL:
AnnaBridge 176:af195413fb11 81 if (handler->_fall) {
AnnaBridge 176:af195413fb11 82 handler->_fall();
AnnaBridge 176:af195413fb11 83 }
AnnaBridge 176:af195413fb11 84 break;
<> 149:156823d33999 85 case IRQ_NONE: break;
<> 149:156823d33999 86 }
<> 149:156823d33999 87 }
<> 149:156823d33999 88
<> 149:156823d33999 89 void InterruptIn::enable_irq() {
<> 149:156823d33999 90 core_util_critical_section_enter();
<> 149:156823d33999 91 gpio_irq_enable(&gpio_irq);
<> 149:156823d33999 92 core_util_critical_section_exit();
<> 149:156823d33999 93 }
<> 149:156823d33999 94
<> 149:156823d33999 95 void InterruptIn::disable_irq() {
<> 149:156823d33999 96 core_util_critical_section_enter();
<> 149:156823d33999 97 gpio_irq_disable(&gpio_irq);
<> 149:156823d33999 98 core_util_critical_section_exit();
<> 149:156823d33999 99 }
<> 149:156823d33999 100
<> 149:156823d33999 101 InterruptIn::operator int() {
<> 149:156823d33999 102 // Underlying call is atomic
<> 149:156823d33999 103 return read();
<> 149:156823d33999 104 }
<> 149:156823d33999 105
<> 149:156823d33999 106 } // namespace mbed
<> 149:156823d33999 107
<> 149:156823d33999 108 #endif