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Added EIC External Interrupt Handling #1

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Merged
BitKnitting merged 2 commits into from
Jul 3, 2018
Merged

Added EIC External Interrupt Handling #1

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ea810bc
added EIC->EXTINT handling; disabled PRIMASK instructions
sommersoft Jul 3, 2018
cdc4d1e
forgot to include a header
sommersoft Jul 3, 2018
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25 changes: 25 additions & 0 deletions src/mymodule.c
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Original file line number Diff line number Diff line change
@@ -1,13 +1,16 @@
#include "py/obj.h"
#include "py/runtime.h"
#include "samd/external_interrupts.h"
#include "samd/pins.h"
#include "hal/include/hal_gpio.h"


#define SET_BIT(REG, BIT) ((REG) |= (BIT))
#define CLEAR_BIT(REG, BIT) ((REG) &= ~(BIT))
#define READ_BIT(REG, BIT) ((REG) & (BIT))

STATIC mp_obj_t mymodule_deep_sleep(void) {
/*
// store the original value for global interrupt enabling
uint32_t original_PRIMASK_value;
original_PRIMASK_value = __get_PRIMASK();
Expand All @@ -19,8 +22,30 @@ STATIC mp_obj_t mymodule_deep_sleep(void) {
NVIC_EnableIRQ(PIN_PA19);
// TBD: Interrupt priority level????
__set_PRIMASK(original_PRIMASK_value);
*/
// Now ... EIC...rev your engine...
turn_on_external_interrupt_controller();

// Set the PMUX pin funciton to "EIC"
gpio_set_pin_function(&PIN_PA19->pin, GPIO_PIN_FUNCTION_A);

// Enable the EIC IRQ on the NVIC
turn_on_cpu_interrupt(&PIN_PA19->extint_channel);

// Configure the EIC to trigger an interrupt on HIGH. I hand-rolled this vs using
// turn_on_eic_channel() since we're setting an extra config (WAKEUP) and are not
// interested in setting the channel_handler (EIC_Handler).
uint8_t config_index = &PIN_PA19->extint_channel / 8;
uint8_t position = (&PIN_PA19->extint_channel % 8) * 4;
uint32_t sense_setting = EIC_CONFIG_SENSE0_HIGH;
// The following instructions will clear any existing register bits.
// Use a mask if you don't want to clear them.
// See the SAMD21 datasheet on Sleep Mode Operation (paragraph 21.6.8, page 310);
// recommends to use both WAKEUPEN and INTENSET.
EIC->CONFIG[config_index].reg = sense_setting << position;
EIC->WAKEUPEN.reg = &PIN_PA19->extint_channel << EIC_WAKEUP_WAKEUPEN_Pos;
EIC->INTENSET.reg = &PIN_PA19->extint_channel << EIC_INTENSET_EXTINT_Pos;

// Go to sleep.
SET_BIT(SCB->SCR,2);
__WFI();
Expand Down