mirror of https://github.com/ARMmbed/mbed-os.git
126 lines
3.4 KiB
C++
126 lines
3.4 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "drivers/InterruptIn.h"
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#if DEVICE_INTERRUPTIN
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namespace mbed {
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// Note: This single-parameter constructor exists to maintain binary
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// compatibility.
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// If not for that, we could simplify by having only the 2-param
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// constructor, with a default value for the PinMode.
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InterruptIn::InterruptIn(PinName pin) : gpio(),
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gpio_irq(),
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_rise(NULL),
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_fall(NULL) {
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// No lock needed in the constructor
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irq_init(pin);
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gpio_init_in(&gpio, pin);
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}
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InterruptIn::InterruptIn(PinName pin, PinMode mode) :
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gpio(),
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gpio_irq(),
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_rise(NULL),
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_fall(NULL) {
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// No lock needed in the constructor
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irq_init(pin);
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gpio_init_in_ex(&gpio, pin, mode);
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}
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void InterruptIn::irq_init(PinName pin) {
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gpio_irq_init(&gpio_irq, pin, (&InterruptIn::_irq_handler), (uint32_t)this);
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}
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InterruptIn::~InterruptIn() {
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// No lock needed in the destructor
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gpio_irq_free(&gpio_irq);
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}
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int InterruptIn::read() {
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// Read only
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return gpio_read(&gpio);
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}
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void InterruptIn::mode(PinMode pull) {
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core_util_critical_section_enter();
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gpio_mode(&gpio, pull);
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core_util_critical_section_exit();
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}
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void InterruptIn::rise(Callback<void()> func) {
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core_util_critical_section_enter();
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if (func) {
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_rise = func;
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gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
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} else {
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_rise = NULL;
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gpio_irq_set(&gpio_irq, IRQ_RISE, 0);
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}
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core_util_critical_section_exit();
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}
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void InterruptIn::fall(Callback<void()> func) {
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core_util_critical_section_enter();
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if (func) {
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_fall = func;
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gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
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} else {
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_fall = NULL;
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gpio_irq_set(&gpio_irq, IRQ_FALL, 0);
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}
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core_util_critical_section_exit();
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}
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void InterruptIn::_irq_handler(uint32_t id, gpio_irq_event event) {
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InterruptIn *handler = (InterruptIn*)id;
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switch (event) {
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case IRQ_RISE:
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if (handler->_rise) {
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handler->_rise();
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}
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break;
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case IRQ_FALL:
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if (handler->_fall) {
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handler->_fall();
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}
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break;
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case IRQ_NONE: break;
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}
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}
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void InterruptIn::enable_irq() {
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core_util_critical_section_enter();
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gpio_irq_enable(&gpio_irq);
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core_util_critical_section_exit();
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}
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void InterruptIn::disable_irq() {
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core_util_critical_section_enter();
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gpio_irq_disable(&gpio_irq);
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core_util_critical_section_exit();
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}
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InterruptIn::operator int() {
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// Underlying call is atomic
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return read();
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}
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} // namespace mbed
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#endif
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