Denislam Valeev / Mbed OS Nucleo_rtos_basic

1

mbed-os/drivers/InterruptIn.cpp@0:e056ac8fecf8, 2018-03-13 (annotated)

Committer:
valeyev
Date:
Tue Mar 13 07:17:50 2018 +0000
Revision:
0:e056ac8fecf8
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valeyev 0:e056ac8fecf8 1 /* mbed Microcontroller Library
valeyev 0:e056ac8fecf8 2 * Copyright (c) 2006-2013 ARM Limited
valeyev 0:e056ac8fecf8 3 *
valeyev 0:e056ac8fecf8 4 * Licensed under the Apache License, Version 2.0 (the "License");
valeyev 0:e056ac8fecf8 5 * you may not use this file except in compliance with the License.
valeyev 0:e056ac8fecf8 6 * You may obtain a copy of the License at
valeyev 0:e056ac8fecf8 7 *
valeyev 0:e056ac8fecf8 8 * http://www.apache.org/licenses/LICENSE-2.0
valeyev 0:e056ac8fecf8 9 *
valeyev 0:e056ac8fecf8 10 * Unless required by applicable law or agreed to in writing, software
valeyev 0:e056ac8fecf8 11 * distributed under the License is distributed on an "AS IS" BASIS,
valeyev 0:e056ac8fecf8 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
valeyev 0:e056ac8fecf8 13 * See the License for the specific language governing permissions and
valeyev 0:e056ac8fecf8 14 * limitations under the License.
valeyev 0:e056ac8fecf8 15 */
valeyev 0:e056ac8fecf8 16 #include "drivers/InterruptIn.h"
valeyev 0:e056ac8fecf8 17
valeyev 0:e056ac8fecf8 18 #if DEVICE_INTERRUPTIN
valeyev 0:e056ac8fecf8 19
valeyev 0:e056ac8fecf8 20 namespace mbed {
valeyev 0:e056ac8fecf8 21
valeyev 0:e056ac8fecf8 22 InterruptIn::InterruptIn(PinName pin) : gpio(),
valeyev 0:e056ac8fecf8 23 gpio_irq(),
valeyev 0:e056ac8fecf8 24 _rise(NULL),
valeyev 0:e056ac8fecf8 25 _fall(NULL) {
valeyev 0:e056ac8fecf8 26 // No lock needed in the constructor
valeyev 0:e056ac8fecf8 27
valeyev 0:e056ac8fecf8 28 gpio_irq_init(&gpio_irq, pin, (&InterruptIn::_irq_handler), (uint32_t)this);
valeyev 0:e056ac8fecf8 29 gpio_init_in(&gpio, pin);
valeyev 0:e056ac8fecf8 30 }
valeyev 0:e056ac8fecf8 31
valeyev 0:e056ac8fecf8 32 InterruptIn::~InterruptIn() {
valeyev 0:e056ac8fecf8 33 // No lock needed in the destructor
valeyev 0:e056ac8fecf8 34 gpio_irq_free(&gpio_irq);
valeyev 0:e056ac8fecf8 35 }
valeyev 0:e056ac8fecf8 36
valeyev 0:e056ac8fecf8 37 int InterruptIn::read() {
valeyev 0:e056ac8fecf8 38 // Read only
valeyev 0:e056ac8fecf8 39 return gpio_read(&gpio);
valeyev 0:e056ac8fecf8 40 }
valeyev 0:e056ac8fecf8 41
valeyev 0:e056ac8fecf8 42 void InterruptIn::mode(PinMode pull) {
valeyev 0:e056ac8fecf8 43 core_util_critical_section_enter();
valeyev 0:e056ac8fecf8 44 gpio_mode(&gpio, pull);
valeyev 0:e056ac8fecf8 45 core_util_critical_section_exit();
valeyev 0:e056ac8fecf8 46 }
valeyev 0:e056ac8fecf8 47
valeyev 0:e056ac8fecf8 48 void InterruptIn::rise(Callback<void()> func) {
valeyev 0:e056ac8fecf8 49 core_util_critical_section_enter();
valeyev 0:e056ac8fecf8 50 if (func) {
valeyev 0:e056ac8fecf8 51 _rise = func;
valeyev 0:e056ac8fecf8 52 gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
valeyev 0:e056ac8fecf8 53 } else {
valeyev 0:e056ac8fecf8 54 _rise = NULL;
valeyev 0:e056ac8fecf8 55 gpio_irq_set(&gpio_irq, IRQ_RISE, 0);
valeyev 0:e056ac8fecf8 56 }
valeyev 0:e056ac8fecf8 57 core_util_critical_section_exit();
valeyev 0:e056ac8fecf8 58 }
valeyev 0:e056ac8fecf8 59
valeyev 0:e056ac8fecf8 60 void InterruptIn::fall(Callback<void()> func) {
valeyev 0:e056ac8fecf8 61 core_util_critical_section_enter();
valeyev 0:e056ac8fecf8 62 if (func) {
valeyev 0:e056ac8fecf8 63 _fall = func;
valeyev 0:e056ac8fecf8 64 gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
valeyev 0:e056ac8fecf8 65 } else {
valeyev 0:e056ac8fecf8 66 _fall = NULL;
valeyev 0:e056ac8fecf8 67 gpio_irq_set(&gpio_irq, IRQ_FALL, 0);
valeyev 0:e056ac8fecf8 68 }
valeyev 0:e056ac8fecf8 69 core_util_critical_section_exit();
valeyev 0:e056ac8fecf8 70 }
valeyev 0:e056ac8fecf8 71
valeyev 0:e056ac8fecf8 72 void InterruptIn::_irq_handler(uint32_t id, gpio_irq_event event) {
valeyev 0:e056ac8fecf8 73 InterruptIn *handler = (InterruptIn*)id;
valeyev 0:e056ac8fecf8 74 switch (event) {
valeyev 0:e056ac8fecf8 75 case IRQ_RISE:
valeyev 0:e056ac8fecf8 76 if (handler->_rise) {
valeyev 0:e056ac8fecf8 77 handler->_rise();
valeyev 0:e056ac8fecf8 78 }
valeyev 0:e056ac8fecf8 79 break;
valeyev 0:e056ac8fecf8 80 case IRQ_FALL:
valeyev 0:e056ac8fecf8 81 if (handler->_fall) {
valeyev 0:e056ac8fecf8 82 handler->_fall();
valeyev 0:e056ac8fecf8 83 }
valeyev 0:e056ac8fecf8 84 break;
valeyev 0:e056ac8fecf8 85 case IRQ_NONE: break;
valeyev 0:e056ac8fecf8 86 }
valeyev 0:e056ac8fecf8 87 }
valeyev 0:e056ac8fecf8 88
valeyev 0:e056ac8fecf8 89 void InterruptIn::enable_irq() {
valeyev 0:e056ac8fecf8 90 core_util_critical_section_enter();
valeyev 0:e056ac8fecf8 91 gpio_irq_enable(&gpio_irq);
valeyev 0:e056ac8fecf8 92 core_util_critical_section_exit();
valeyev 0:e056ac8fecf8 93 }
valeyev 0:e056ac8fecf8 94
valeyev 0:e056ac8fecf8 95 void InterruptIn::disable_irq() {
valeyev 0:e056ac8fecf8 96 core_util_critical_section_enter();
valeyev 0:e056ac8fecf8 97 gpio_irq_disable(&gpio_irq);
valeyev 0:e056ac8fecf8 98 core_util_critical_section_exit();
valeyev 0:e056ac8fecf8 99 }
valeyev 0:e056ac8fecf8 100
valeyev 0:e056ac8fecf8 101 InterruptIn::operator int() {
valeyev 0:e056ac8fecf8 102 // Underlying call is atomic
valeyev 0:e056ac8fecf8 103 return read();
valeyev 0:e056ac8fecf8 104 }
valeyev 0:e056ac8fecf8 105
valeyev 0:e056ac8fecf8 106 } // namespace mbed
valeyev 0:e056ac8fecf8 107
valeyev 0:e056ac8fecf8 108 #endif