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/*
Copyright (c) 2015 Arduino LLC. All right reserved.
Copyright (c) 2016 Sandeep Mistry All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <nrf.h>
#include "Arduino.h"
#include "wiring_private.h"
#include <string.h>
#if defined(NRF52) || defined(NRF52_SERIES)
#define NUMBER_OF_GPIO_TE 8
#else
#define NUMBER_OF_GPIO_TE 4
#endif
static voidFuncPtr callbacksInt[NUMBER_OF_GPIO_TE];
static bool callbackDeferred[NUMBER_OF_GPIO_TE];
static int8_t channelMap[NUMBER_OF_GPIO_TE];
static int enabled = 0;
/* Configure I/O interrupt sources */
static void __initialize()
{
memset(callbacksInt, 0, sizeof(callbacksInt));
memset(channelMap, -1, sizeof(channelMap));
memset(callbackDeferred, 0, sizeof(callbackDeferred));
NVIC_DisableIRQ(GPIOTE_IRQn);
NVIC_ClearPendingIRQ(GPIOTE_IRQn);
NVIC_SetPriority(GPIOTE_IRQn, 3);
NVIC_EnableIRQ(GPIOTE_IRQn);
}
/*
* \brief Specifies a named Interrupt Service Routine (ISR) to call when an interrupt occurs.
* Replaces any previous function that was attached to the interrupt.
*
* \return Interrupt Mask
*/
int attachInterrupt(uint32_t pin, voidFuncPtr callback, uint32_t mode)
{
if (!enabled) {
__initialize();
enabled = 1;
}
if (pin >= PINS_COUNT) {
return 0;
}
pin = g_ADigitalPinMap[pin];
bool deferred = (mode & ISR_DEFERRED) ? true : false;
mode &= ~ISR_DEFERRED;
uint32_t polarity;
switch (mode) {
case CHANGE:
polarity = GPIOTE_CONFIG_POLARITY_Toggle;
break;
case FALLING:
polarity = GPIOTE_CONFIG_POLARITY_HiToLo;
break;
case RISING:
polarity = GPIOTE_CONFIG_POLARITY_LoToHi;
break;
default:
return;
}
for (int ch = 0; ch < NUMBER_OF_GPIO_TE; ch++) {
if (channelMap[ch] == -1 || (uint32_t)channelMap[ch] == pin) {
channelMap[ch] = pin;
callbacksInt[ch] = callback;
callbackDeferred[ch] = deferred;
NRF_GPIOTE->CONFIG[ch] &= ~(GPIOTE_CONFIG_PSEL_Msk | GPIOTE_CONFIG_POLARITY_Msk);
NRF_GPIOTE->CONFIG[ch] |= ((pin << GPIOTE_CONFIG_PSEL_Pos) & GPIOTE_CONFIG_PSEL_Msk) |
((polarity << GPIOTE_CONFIG_POLARITY_Pos) & GPIOTE_CONFIG_POLARITY_Msk);
NRF_GPIOTE->CONFIG[ch] |= GPIOTE_CONFIG_MODE_Event;
NRF_GPIOTE->INTENSET = (1 << ch);
return (1 << ch);
}
}
return 0;
}
/*
* \brief Turns off the given interrupt.
*/
void detachInterrupt(uint32_t pin)
{
if (pin >= PINS_COUNT) {
return;
}
pin = g_ADigitalPinMap[pin];
for (int ch = 0; ch < NUMBER_OF_GPIO_TE; ch++) {
if ((uint32_t)channelMap[ch] == pin) {
channelMap[ch] = -1;
callbacksInt[ch] = NULL;
callbackDeferred[ch] = false;
NRF_GPIOTE->CONFIG[ch] &= ~GPIOTE_CONFIG_MODE_Event;
NRF_GPIOTE->INTENCLR = (1 << ch);
break;
}
}
}
void GPIOTE_IRQHandler()
{
uint32_t event = offsetof(NRF_GPIOTE_Type, EVENTS_IN[0]);
for (int ch = 0; ch < NUMBER_OF_GPIO_TE; ch++) {
if ((*(uint32_t *)((uint32_t)NRF_GPIOTE + event) == 0x1UL) && (NRF_GPIOTE->INTENSET & (1 << ch))) {
if (channelMap[ch] != -1 && callbacksInt[ch]) {
if ( callbackDeferred[ch] ) {
// Adafruit defer callback to non-isr if configured so
ada_callback_fromISR(NULL, callbacksInt[ch]);
}else{
callbacksInt[ch]();
}
}
*(uint32_t *)((uint32_t)NRF_GPIOTE + event) = 0;
#if __CORTEX_M == 0x04
volatile uint32_t dummy = *((volatile uint32_t *)((uint32_t)NRF_GPIOTE + event));
(void)dummy;
#endif
}
event = (uint32_t)((uint32_t)event + 4);
}
}
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