zhang boie / mbed-dev-f30333

drivers/InterruptIn.cpp@0:bdf663c61a82, 2022-06-14 (annotated)

Committer:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4
Date:
Tue Jun 14 09:21:18 2022 +0000
Revision:
0:bdf663c61a82
lib

Who changed what in which revision?

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abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 1 /* mbed Microcontroller Library
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 2 * Copyright (c) 2006-2013 ARM Limited
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 3 *
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 4 * Licensed under the Apache License, Version 2.0 (the "License");
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 5 * you may not use this file except in compliance with the License.
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 6 * You may obtain a copy of the License at
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 7 *
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 8 * http://www.apache.org/licenses/LICENSE-2.0
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 9 *
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 10 * Unless required by applicable law or agreed to in writing, software
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 11 * distributed under the License is distributed on an "AS IS" BASIS,
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 13 * See the License for the specific language governing permissions and
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 14 * limitations under the License.
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 15 */
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 16 #include "drivers/InterruptIn.h"
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 17
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 18 #if DEVICE_INTERRUPTIN
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 19
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 20 namespace mbed {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 21
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 22 InterruptIn::InterruptIn(PinName pin) : gpio(),
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 23 gpio_irq(),
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 24 _rise(NULL),
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 25 _fall(NULL) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 26 // No lock needed in the constructor
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 27
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 28 gpio_irq_init(&gpio_irq, pin, (&InterruptIn::_irq_handler), (uint32_t)this);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 29 gpio_init_in(&gpio, pin);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 30 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 31
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 32 InterruptIn::~InterruptIn() {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 33 // No lock needed in the destructor
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 34 gpio_irq_free(&gpio_irq);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 35 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 36
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 37 int InterruptIn::read() {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 38 // Read only
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 39 return gpio_read(&gpio);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 40 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 41
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 42 void InterruptIn::mode(PinMode pull) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 43 core_util_critical_section_enter();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 44 gpio_mode(&gpio, pull);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 45 core_util_critical_section_exit();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 46 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 47
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 48 void InterruptIn::rise(Callback<void()> func) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 49 core_util_critical_section_enter();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 50 if (func) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 51 _rise = func;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 52 gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 53 } else {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 54 _rise = NULL;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 55 gpio_irq_set(&gpio_irq, IRQ_RISE, 0);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 56 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 57 core_util_critical_section_exit();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 58 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 59
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 60 void InterruptIn::fall(Callback<void()> func) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 61 core_util_critical_section_enter();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 62 if (func) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 63 _fall = func;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 64 gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 65 } else {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 66 _fall = NULL;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 67 gpio_irq_set(&gpio_irq, IRQ_FALL, 0);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 68 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 69 core_util_critical_section_exit();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 70 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 71
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 72 void InterruptIn::_irq_handler(uint32_t id, gpio_irq_event event) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 73 InterruptIn *handler = (InterruptIn*)id;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 74 switch (event) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 75 case IRQ_RISE:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 76 if (handler->_rise) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 77 handler->_rise();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 78 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 79 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 80 case IRQ_FALL:
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 81 if (handler->_fall) {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 82 handler->_fall();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 83 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 84 break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 85 case IRQ_NONE: break;
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 86 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 87 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 88
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 89 void InterruptIn::enable_irq() {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 90 core_util_critical_section_enter();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 91 gpio_irq_enable(&gpio_irq);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 92 core_util_critical_section_exit();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 93 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 94
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 95 void InterruptIn::disable_irq() {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 96 core_util_critical_section_enter();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 97 gpio_irq_disable(&gpio_irq);
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 98 core_util_critical_section_exit();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 99 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 100
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 101 InterruptIn::operator int() {
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 102 // Underlying call is atomic
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 103 return read();
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 104 }
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 105
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 106 } // namespace mbed
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 107
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 108 #endif
abe5b02d-a2d4-4fe9-818e-c4e57c809ea4 0:bdf663c61a82 109