diff --git a/docs/library/machine.rst b/docs/library/machine.rst
index 3f5cd6f13c72b..db7ed9038ee78 100644
--- a/docs/library/machine.rst
+++ b/docs/library/machine.rst
@@ -166,6 +166,15 @@ Power related functions
Availability: ESP32, WiPy.
+.. function:: wake_ext1_pins()
+
+ Returns the GPIO pin numbers of those pins which caused wakeup from deep sleep as a
+ tuple of integers.
+
+ This is a direct interface to the ESP-IDF ``esp_sleep_get_ext1_wakeup_status()`` function.
+
+ Availability: ESP32 (except ESP32C3).
+
Miscellaneous functions
-----------------------
diff --git a/ports/esp32/modmachine.c b/ports/esp32/modmachine.c
index 37d4f424d4216..1f8250ce41925 100644
--- a/ports/esp32/modmachine.c
+++ b/ports/esp32/modmachine.c
@@ -231,6 +231,33 @@ 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);
+#if !CONFIG_IDF_TARGET_ESP32C3
+STATIC mp_obj_t machine_wake_ext1_pins(void) {
+ uint64_t status = esp_sleep_get_ext1_wakeup_status();
+ int len, index;
+ mp_obj_t *tuple = NULL;
+
+ // Only a few (~8) GPIOs might cause EXT1 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_ext1_pins_obj, machine_wake_ext1_pins);
+#endif
+
STATIC mp_obj_t machine_reset(void) {
esp_restart();
return mp_const_none;
@@ -344,6 +371,10 @@ STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
{ 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) },
+ #if !CONFIG_IDF_TARGET_ESP32C3
+ // ext1 wakeup pins
+ { MP_ROM_QSTR(MP_QSTR_wake_ext1_pins), MP_ROM_PTR(&machine_wake_ext1_pins_obj) },
+ #endif
};
STATIC MP_DEFINE_CONST_DICT(machine_module_globals, machine_module_globals_table);
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