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modmachine: Add machine.wake_pins. #17542

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7 changes: 7 additions & 0 deletions docs/library/machine.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -171,6 +171,13 @@ Power related functions

Availability: ESP32, WiPy.

.. function:: wake_pins()

Returns the GPIO pin numbers of those pins which caused wakeup from deep sleep as a
tuple of integers.

Availability: ESP32.

Miscellaneous functions
-----------------------

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35 changes: 35 additions & 0 deletions ports/esp32/modmachine.c
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Expand Up @@ -79,6 +79,7 @@
{ MP_ROM_QSTR(MP_QSTR_TIMER_WAKE), MP_ROM_INT(ESP_SLEEP_WAKEUP_TIMER) }, \
{ MP_ROM_QSTR(MP_QSTR_TOUCHPAD_WAKE), MP_ROM_INT(ESP_SLEEP_WAKEUP_TOUCHPAD) }, \
{ MP_ROM_QSTR(MP_QSTR_ULP_WAKE), MP_ROM_INT(ESP_SLEEP_WAKEUP_ULP) }, \
{ MP_ROM_QSTR(MP_QSTR_wake_pins), MP_ROM_PTR(&machine_wake_pins_obj) }, \

typedef enum {
MP_PWRON_RESET = 1,
Expand Down Expand Up @@ -254,6 +255,40 @@ static mp_obj_t machine_wake_reason(size_t n_args, const mp_obj_t *pos_args, mp_
}
static MP_DEFINE_CONST_FUN_OBJ_KW(machine_wake_reason_obj, 0, machine_wake_reason);

static mp_obj_t machine_wake_pins(void) {
uint64_t status = 0;
int len, index;
mp_obj_t *tuple = NULL;

// There will be only one wake-up source, so it is OK to logically OR all the
// wake-up source statuses.
#if SOC_GPIO_SUPPORT_DEEPSLEEP_WAKEUP && SOC_DEEP_SLEEP_SUPPORTED
status |= esp_sleep_get_gpio_wakeup_status();
#endif

#if SOC_PM_SUPPORT_EXT1_WAKEUP && SOC_RTCIO_PIN_COUNT > 0
status |= esp_sleep_get_ext1_wakeup_status();
#endif

// Only a few (~8) pins might cause wakeup.
// Therefore, we don't allocate 64*4 = 256 bytes on the stack and calculate the
// required space in a first pass.
for (index = 0, len = 0; index < 64; index++) {
len += (status & ((uint64_t)1 << index)) ? 1 : 0;
}
if (len) {
tuple = alloca(len * sizeof(*tuple));

for (index = 0, len = 0; index < 64; index++) {
if (status & ((uint64_t)1 << index)) {
tuple[len++] = MP_OBJ_NEW_SMALL_INT(index);
}
}
}
return mp_obj_new_tuple(len, tuple);
}
static MP_DEFINE_CONST_FUN_OBJ_0(machine_wake_pins_obj, machine_wake_pins);

MP_NORETURN static void mp_machine_reset(void) {
esp_restart();
}
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