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Enables GPIO low accuracy interrupt #367

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Enables GPIO low accuracy interrupt #367

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85 changes: 74 additions & 11 deletions cores/nRF5/WInterrupts.c
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Original file line number Diff line number Diff line change
Expand Up @@ -32,13 +32,15 @@

static voidFuncPtr callbacksInt[NUMBER_OF_GPIO_TE];
static int8_t channelMap[NUMBER_OF_GPIO_TE];
static voidFuncPtr callbackLowAccuracyInt;
static int enabled = 0;

/* Configure I/O interrupt sources */
static void __initialize()
{
memset(callbacksInt, 0, sizeof(callbacksInt));
memset(channelMap, -1, sizeof(channelMap));
callbackLowAccuracyInt = NULL;

NVIC_DisableIRQ(GPIOTE_IRQn);
NVIC_ClearPendingIRQ(GPIOTE_IRQn);
Expand Down Expand Up @@ -125,23 +127,84 @@ void detachInterrupt(uint32_t pin)
}
}

/*
* \brief Specifies a named Interrupt Service Routine (ISR) to call when an interrupt occurs.
* Replaces any previous function that was attached to the interrupt.
* Only one callback can be assigned to the low accuracy interrupt AKA PORT event.
*/
void attachInterruptLowAccuracy(uint32_t pin, voidFuncPtr callback, uint32_t mode)
{
if (!enabled) {
__initialize();
enabled = 1;
}

if (pin >= PINS_COUNT) {
return;
}

pin = g_ADigitalPinMap[pin];

uint32_t polarity;

switch (mode) {
case FALLING:
NRF_GPIO->PIN_CNF[pin] |= ((uint32_t)GPIO_PIN_CNF_SENSE_Low << GPIO_PIN_CNF_SENSE_Pos);
break;

case RISING:
NRF_GPIO->PIN_CNF[pin] |= ((uint32_t)GPIO_PIN_CNF_SENSE_High << GPIO_PIN_CNF_SENSE_Pos);
break;

default:
return;
}

callbackLowAccuracyInt = callback;
NRF_GPIOTE->INTENSET = GPIOTE_INTENSET_PORT_Msk;
}

/*
* \brief Turns off the given low accuracy interrupt.
*/
void detachInterruptLowAccuracy(uint32_t pin)
{
if (pin >= PINS_COUNT) {
return;
}

pin = g_ADigitalPinMap[pin];

callbackLowAccuracyInt = NULL;

NRF_GPIO->PIN_CNF[pin] &= ~((uint32_t)GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
NRF_GPIOTE->INTENCLR = GPIOTE_INTENCLR_PORT_Msk;
}

void GPIOTE_IRQHandler()
{
uint32_t event = offsetof(NRF_GPIOTE_Type, EVENTS_IN[0]);
if(NRF_GPIOTE->EVENTS_PORT == 1 && (NRF_GPIOTE->INTENSET & GPIOTE_INTENSET_PORT_Msk)) {
if(callbackLowAccuracyInt) {
callbackLowAccuracyInt();
}
NRF_GPIOTE->EVENTS_PORT = 0;
} else {
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]) {
callbacksInt[ch]();
}
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]) {
callbacksInt[ch]();
}

*(uint32_t *)((uint32_t)NRF_GPIOTE + event) = 0;
*(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;
volatile uint32_t dummy = *((volatile uint32_t *)((uint32_t)NRF_GPIOTE + event));
(void)dummy;
#endif
}
}

event = (uint32_t)((uint32_t)event + 4);
event = (uint32_t)((uint32_t)event + 4);
}
}
}
12 changes: 12 additions & 0 deletions cores/nRF5/WInterrupts.h
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,18 @@ void attachInterrupt(uint32_t pin, voidFuncPtr callback, uint32_t mode);
*/
void detachInterrupt(uint32_t pin);

/*
* \brief Specifies a named Interrupt Service Routine (ISR) to call when an interrupt occurs.
* Replaces any previous function that was attached to the interrupt.
* Only one callback can be assigned to the low accuracy interrupt AKA PORT event.
*/
void attachInterruptLowAccuracy(uint32_t pin, voidFuncPtr callback, uint32_t mode);

/*
* \brief Turns off the given low accuracy interrupt.
*/
void detachInterruptLowAccuracy(uint32_t pin);

#ifdef __cplusplus
}
#endif
Expand Down