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189 lines
4.1 KiB
C
189 lines
4.1 KiB
C
/**
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* \file
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*
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* \brief External interrupt functionality imkplementation.
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*
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* Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
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*
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* \asf_license_start
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*
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* \page License
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*
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* Subject to your compliance with these terms, you may use Microchip
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* software and any derivatives exclusively with Microchip products.
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* It is your responsibility to comply with third party license terms applicable
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* to your use of third party software (including open source software) that
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* may accompany Microchip software.
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*
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* THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
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* WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
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* INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
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* AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
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* LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
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* LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
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* SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
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* POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE FULLEST EXTENT
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* ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
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* RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
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* THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
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*
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* \asf_license_stop
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*
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*/
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#include "hal_ext_irq.h"
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#define EXT_IRQ_AMOUNT 0
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/**
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* \brief Driver version
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*/
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#define DRIVER_VERSION 0x00000001u
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/**
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* \brief External IRQ struct
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*/
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struct ext_irq {
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ext_irq_cb_t cb;
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uint32_t pin;
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};
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/* Remove KEIL compiling error in case no IRQ line selected */
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#if EXT_IRQ_AMOUNT == 0
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#undef EXT_IRQ_AMOUNT
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#define EXT_IRQ_AMOUNT 1
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#endif
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/**
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* \brief Array of external IRQs callbacks
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*/
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static struct ext_irq ext_irqs[EXT_IRQ_AMOUNT];
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static void process_ext_irq(const uint32_t pin);
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/**
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* \brief Initialize external irq component if any
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*/
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int32_t ext_irq_init(void)
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{
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uint16_t i;
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for (i = 0; i < EXT_IRQ_AMOUNT; i++) {
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ext_irqs[i].pin = 0xFFFFFFFF;
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ext_irqs[i].cb = NULL;
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}
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return _ext_irq_init(process_ext_irq);
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}
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/**
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* \brief Deinitialize external irq if any
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*/
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int32_t ext_irq_deinit(void)
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{
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return _ext_irq_deinit();
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}
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/**
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* \brief Register callback for the given external interrupt
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*/
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int32_t ext_irq_register(const uint32_t pin, ext_irq_cb_t cb)
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{
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uint8_t i = 0, j = 0;
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bool found = false;
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for (; i < EXT_IRQ_AMOUNT; i++) {
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if (ext_irqs[i].pin == pin) {
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ext_irqs[i].cb = cb;
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found = true;
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break;
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}
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}
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if (NULL == cb) {
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if (!found) {
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return ERR_INVALID_ARG;
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}
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return _ext_irq_enable(pin, false);
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}
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if (!found) {
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for (i = 0; i < EXT_IRQ_AMOUNT; i++) {
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if (NULL == ext_irqs[i].cb) {
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ext_irqs[i].cb = cb;
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ext_irqs[i].pin = pin;
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found = true;
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break;
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}
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}
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for (; (j < EXT_IRQ_AMOUNT) && (i < EXT_IRQ_AMOUNT); j++) {
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if ((ext_irqs[i].pin < ext_irqs[j].pin) && (ext_irqs[j].pin != 0xFFFFFFFF)) {
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struct ext_irq tmp = ext_irqs[j];
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ext_irqs[j] = ext_irqs[i];
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ext_irqs[i] = tmp;
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}
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}
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}
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if (!found) {
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return ERR_INVALID_ARG;
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}
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return _ext_irq_enable(pin, true);
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}
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/**
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* \brief Enable external irq
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*/
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int32_t ext_irq_enable(const uint32_t pin)
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{
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return _ext_irq_enable(pin, true);
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}
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/**
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* \brief Disable external irq
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*/
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int32_t ext_irq_disable(const uint32_t pin)
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{
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return _ext_irq_enable(pin, false);
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}
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/**
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* \brief Retrieve the current driver version
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*/
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uint32_t ext_irq_get_version(void)
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{
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return DRIVER_VERSION;
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}
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/**
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* \brief Interrupt processing routine
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*
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* \param[in] pin The pin which triggered the interrupt
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*/
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static void process_ext_irq(const uint32_t pin)
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{
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uint8_t lower = 0, middle, upper = EXT_IRQ_AMOUNT;
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while (upper >= lower) {
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middle = (upper + lower) >> 1;
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if (middle >= EXT_IRQ_AMOUNT) {
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return;
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}
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if (ext_irqs[middle].pin == pin) {
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if (ext_irqs[middle].cb) {
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ext_irqs[middle].cb();
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}
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return;
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}
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if (ext_irqs[middle].pin < pin) {
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lower = middle + 1;
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} else {
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upper = middle - 1;
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}
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}
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}
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