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/**
* \file
*
* \brief External interrupt functionality imkplementation.
*
* Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
*
* \asf_license_start
*
* \page License
*
* Subject to your compliance with these terms, you may use Microchip
* software and any derivatives exclusively with Microchip products.
* It is your responsibility to comply with third party license terms applicable
* to your use of third party software (including open source software) that
* may accompany Microchip software.
*
* THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
* WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
* INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
* AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
* LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
* LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
* SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
* POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE FULLEST EXTENT
* ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
* RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
* THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
*
* \asf_license_stop
*
*/
#include "hal_ext_irq.h"
#define EXT_IRQ_AMOUNT 3
/**
* \brief Driver version
*/
#define DRIVER_VERSION 0x00000001u
/**
* \brief External IRQ struct
*/
struct ext_irq {
ext_irq_cb_t cb;
uint32_t pin;
};
/* Remove KEIL compiling error in case no IRQ line selected */
#if EXT_IRQ_AMOUNT == 0
#undef EXT_IRQ_AMOUNT
#define EXT_IRQ_AMOUNT 1
#endif
/**
* \brief Array of external IRQs callbacks
*/
static struct ext_irq ext_irqs[EXT_IRQ_AMOUNT];
static void process_ext_irq(const uint32_t pin);
/**
* \brief Initialize external irq component if any
*/
int32_t ext_irq_init(void)
{
uint16_t i;
for (i = 0; i < EXT_IRQ_AMOUNT; i++) {
ext_irqs[i].pin = 0xFFFFFFFF;
ext_irqs[i].cb = NULL;
}
return _ext_irq_init(process_ext_irq);
}
/**
* \brief Deinitialize external irq if any
*/
int32_t ext_irq_deinit(void)
{
return _ext_irq_deinit();
}
/**
* \brief Register callback for the given external interrupt
*/
int32_t ext_irq_register(const uint32_t pin, ext_irq_cb_t cb)
{
uint8_t i = 0, j = 0;
bool found = false;
for (; i < EXT_IRQ_AMOUNT; i++) {
if (ext_irqs[i].pin == pin) {
ext_irqs[i].cb = cb;
found = true;
break;
}
}
if (NULL == cb) {
if (!found) {
return ERR_INVALID_ARG;
}
return _ext_irq_enable(pin, false);
}
if (!found) {
for (i = 0; i < EXT_IRQ_AMOUNT; i++) {
if (NULL == ext_irqs[i].cb) {
ext_irqs[i].cb = cb;
ext_irqs[i].pin = pin;
found = true;
break;
}
}
for (; (j < EXT_IRQ_AMOUNT) && (i < EXT_IRQ_AMOUNT); j++) {
if ((ext_irqs[i].pin < ext_irqs[j].pin) && (ext_irqs[j].pin != 0xFFFFFFFF)) {
struct ext_irq tmp = ext_irqs[j];
ext_irqs[j] = ext_irqs[i];
ext_irqs[i] = tmp;
}
}
}
if (!found) {
return ERR_INVALID_ARG;
}
return _ext_irq_enable(pin, true);
}
/**
* \brief Enable external irq
*/
int32_t ext_irq_enable(const uint32_t pin)
{
return _ext_irq_enable(pin, true);
}
/**
* \brief Disable external irq
*/
int32_t ext_irq_disable(const uint32_t pin)
{
return _ext_irq_enable(pin, false);
}
/**
* \brief Retrieve the current driver version
*/
uint32_t ext_irq_get_version(void)
{
return DRIVER_VERSION;
}
/**
* \brief Interrupt processing routine
*
* \param[in] pin The pin which triggered the interrupt
*/
static void process_ext_irq(const uint32_t pin)
{
uint8_t lower = 0, middle, upper = EXT_IRQ_AMOUNT;
while (upper >= lower) {
middle = (upper + lower) >> 1;
if (middle >= EXT_IRQ_AMOUNT) {
return;
}
if (ext_irqs[middle].pin == pin) {
if (ext_irqs[middle].cb) {
ext_irqs[middle].cb();
}
return;
}
if (ext_irqs[middle].pin < pin) {
lower = middle + 1;
} else {
upper = middle - 1;
}
}
}
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