diff --git a/docs/library/machine.rst b/docs/library/machine.rst
index 76d111f11ef3d..1e7ad7b6b9e7a 100644
--- a/docs/library/machine.rst
+++ b/docs/library/machine.rst
@@ -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
-----------------------
diff --git a/ports/esp32/modmachine.c b/ports/esp32/modmachine.c
index 0d7ea44c66960..2dfc8793ffa2e 100644
--- a/ports/esp32/modmachine.c
+++ b/ports/esp32/modmachine.c
@@ -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,
@@ -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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