/**
* \internal
* \brief Disables the External Interrupt driver.
*
* Disables EIC modules that were previously started via a call to
* \ref _extint_enable().
* Registered callback list will not be affected if callback mode is used.
*/
void _extint_disable(void)
{
Eic *const eics[EIC_INST_NUM] = EIC_INSTS;
/* Disable all EIC hardware modules. */
for (uint32_t i = 0; i < EIC_INST_NUM; i++) {
eics[i]->CTRL.reg &= ~EIC_CTRL_ENABLE;
}
while (extint_is_syncing()) {
/* Wait for all hardware modules to complete synchronization */
}
}
void _system_extint_init(void)
{
Eic *const eics[EIC_INST_NUM] = EIC_INSTS;
/* Turn on the digital interface clock */
system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBA, MCLK_APBAMASK_EIC);
#if (EXTINT_CLOCK_SELECTION == EXTINT_CLK_GCLK)
/* Configure the generic clock for the module and enable it */
struct system_gclk_chan_config gclk_chan_conf;
system_gclk_chan_get_config_defaults(&gclk_chan_conf);
gclk_chan_conf.source_generator = EXTINT_CLOCK_SOURCE;
system_gclk_chan_set_config(EIC_GCLK_ID, &gclk_chan_conf);
/* Enable the clock anyway, since when needed it will be requested
* by External Interrupt driver */
system_gclk_chan_enable(EIC_GCLK_ID);
#endif
/* Reset all EIC hardware modules. */
for (uint32_t i = 0; i < EIC_INST_NUM; i++) {
eics[i]->CTRLA.reg |= EIC_CTRLA_SWRST;
}
while (extint_is_syncing()) {
/* Wait for all hardware modules to complete synchronization */
}
#if (EXTINT_CLOCK_SELECTION == EXTINT_CLK_GCLK)
for (uint32_t i = 0; i < EIC_INST_NUM; i++) {
eics[i]->CTRLA.bit.CKSEL = EXTINT_CLK_GCLK;
}
#else
for (uint32_t i = 0; i < EIC_INST_NUM; i++) {
eics[i]->CTRLA.bit.CKSEL = EXTINT_CLK_ULP32K;
}
#endif
/* Reset the software module */
#if EXTINT_CALLBACK_MODE == true
/* Clear callback registration table */
for (uint8_t j = 0; j < EIC_NUMBER_OF_INTERRUPTS; j++) {
_extint_dev.callbacks[j] = NULL;
}
system_interrupt_enable(SYSTEM_INTERRUPT_MODULE_EIC);
#endif
/* Enables the driver for further use */
_extint_enable();
}