Iftikhar Aziz / mbed-dev

4545

Dependents:   LSS_Rev_1

Fork of mbed-dev by Umar Naeem

drivers/InterruptIn.cpp@166:33361e55dd8c, 2017-08-23 (annotated)

Committer:
iftaziz
Date:
Wed Aug 23 10:32:38 2017 +0000
Revision:
166:33361e55dd8c
Parent:
160:d5399cc887bb 
r1

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 static void donothing() {}
<> 149:156823d33999 23
<> 149:156823d33999 24 InterruptIn::InterruptIn(PinName pin) : gpio(),
<> 149:156823d33999 25 gpio_irq(),
<> 149:156823d33999 26 _rise(),
<> 149:156823d33999 27 _fall() {
<> 149:156823d33999 28 // No lock needed in the constructor
<> 149:156823d33999 29
<> 160:d5399cc887bb 30 _rise = donothing;
<> 160:d5399cc887bb 31 _fall = donothing;
<> 149:156823d33999 32
<> 149:156823d33999 33 gpio_irq_init(&gpio_irq, pin, (&InterruptIn::_irq_handler), (uint32_t)this);
<> 149:156823d33999 34 gpio_init_in(&gpio, pin);
<> 149:156823d33999 35 }
<> 149:156823d33999 36
<> 149:156823d33999 37 InterruptIn::~InterruptIn() {
<> 149:156823d33999 38 // No lock needed in the destructor
<> 149:156823d33999 39 gpio_irq_free(&gpio_irq);
<> 149:156823d33999 40 }
<> 149:156823d33999 41
<> 149:156823d33999 42 int InterruptIn::read() {
<> 149:156823d33999 43 // Read only
<> 149:156823d33999 44 return gpio_read(&gpio);
<> 149:156823d33999 45 }
<> 149:156823d33999 46
<> 149:156823d33999 47 void InterruptIn::mode(PinMode pull) {
<> 149:156823d33999 48 core_util_critical_section_enter();
<> 149:156823d33999 49 gpio_mode(&gpio, pull);
<> 149:156823d33999 50 core_util_critical_section_exit();
<> 149:156823d33999 51 }
<> 149:156823d33999 52
<> 149:156823d33999 53 void InterruptIn::rise(Callback<void()> func) {
<> 149:156823d33999 54 core_util_critical_section_enter();
<> 149:156823d33999 55 if (func) {
<> 160:d5399cc887bb 56 _rise = func;
<> 149:156823d33999 57 gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
<> 149:156823d33999 58 } else {
<> 160:d5399cc887bb 59 _rise = donothing;
<> 149:156823d33999 60 gpio_irq_set(&gpio_irq, IRQ_RISE, 0);
<> 149:156823d33999 61 }
<> 149:156823d33999 62 core_util_critical_section_exit();
<> 149:156823d33999 63 }
<> 149:156823d33999 64
<> 149:156823d33999 65 void InterruptIn::fall(Callback<void()> func) {
<> 149:156823d33999 66 core_util_critical_section_enter();
<> 149:156823d33999 67 if (func) {
<> 160:d5399cc887bb 68 _fall = func;
<> 149:156823d33999 69 gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
<> 149:156823d33999 70 } else {
<> 160:d5399cc887bb 71 _fall = donothing;
<> 149:156823d33999 72 gpio_irq_set(&gpio_irq, IRQ_FALL, 0);
<> 149:156823d33999 73 }
<> 149:156823d33999 74 core_util_critical_section_exit();
<> 149:156823d33999 75 }
<> 149:156823d33999 76
<> 149:156823d33999 77 void InterruptIn::_irq_handler(uint32_t id, gpio_irq_event event) {
<> 149:156823d33999 78 InterruptIn *handler = (InterruptIn*)id;
<> 149:156823d33999 79 switch (event) {
<> 160:d5399cc887bb 80 case IRQ_RISE: handler->_rise(); break;
<> 160:d5399cc887bb 81 case IRQ_FALL: handler->_fall(); break;
<> 149:156823d33999 82 case IRQ_NONE: break;
<> 149:156823d33999 83 }
<> 149:156823d33999 84 }
<> 149:156823d33999 85
<> 149:156823d33999 86 void InterruptIn::enable_irq() {
<> 149:156823d33999 87 core_util_critical_section_enter();
<> 149:156823d33999 88 gpio_irq_enable(&gpio_irq);
<> 149:156823d33999 89 core_util_critical_section_exit();
<> 149:156823d33999 90 }
<> 149:156823d33999 91
<> 149:156823d33999 92 void InterruptIn::disable_irq() {
<> 149:156823d33999 93 core_util_critical_section_enter();
<> 149:156823d33999 94 gpio_irq_disable(&gpio_irq);
<> 149:156823d33999 95 core_util_critical_section_exit();
<> 149:156823d33999 96 }
<> 149:156823d33999 97
<> 149:156823d33999 98 InterruptIn::operator int() {
<> 149:156823d33999 99 // Underlying call is atomic
<> 149:156823d33999 100 return read();
<> 149:156823d33999 101 }
<> 149:156823d33999 102
<> 149:156823d33999 103 } // namespace mbed
<> 149:156823d33999 104
<> 149:156823d33999 105 #endif