/*
* \brief Specifies a named Interrupt Service Routine (ISR) to call when an interrupt occurs.
* Replaces any previous function that was attached to the interrupt.
*/
void attachInterrupt(uint32_t pin, voidFuncPtr callback, uint32_t mode)
{
static int enabled = 0;
uint32_t config;
uint32_t pos;
// Assign pin to EIC
if (pinPeripheral(pin, PIO_EXTINT) != RET_STATUS_OK)
return;
EExt_Interrupts in = digitalPinToInterrupt(pin);
if (in == NOT_AN_INTERRUPT || in == EXTERNAL_INT_NMI)
return;
if (!enabled) {
__initialize();
enabled = 1;
}
// Assign callback to interrupt
callbacksInt[in] = callback;
// Look for right CONFIG register to be addressed
if (in > EXTERNAL_INT_7) {
config = 1;
} else {
config = 0;
}
// Configure the interrupt mode
pos = (in - (8 * config)) << 2;
switch (mode)
{
case LOW:
EIC->CONFIG[config].reg |= EIC_CONFIG_SENSE0_LOW_Val << pos;
break;
case HIGH:
EIC->CONFIG[config].reg |= EIC_CONFIG_SENSE0_HIGH_Val << pos;
break;
case CHANGE:
EIC->CONFIG[config].reg |= EIC_CONFIG_SENSE0_BOTH_Val << pos;
break;
case FALLING:
EIC->CONFIG[config].reg |= EIC_CONFIG_SENSE0_FALL_Val << pos;
break;
case RISING:
EIC->CONFIG[config].reg |= EIC_CONFIG_SENSE0_RISE_Val << pos;
break;
}
// Enable the interrupt
EIC->INTENSET.reg = EIC_INTENSET_EXTINT(1 << in);
}
void SPIClass::endTransaction(void)
{
if (interruptMode != SPI_IMODE_NONE)
{
if (interruptMode & SPI_IMODE_GLOBAL)
{
if (interruptSave)
interrupts();
}
else if (interruptMode & SPI_IMODE_EXTINT)
EIC->INTENSET.reg = EIC_INTENSET_EXTINT(interruptMask);
}
}
