ESP32 Forum

Hello,

I am configuring 2 pins (GPIO32,33) as ext1 wakeup source from deep sleep with mode = ALL_LOW (i.e wakeup when both pins are LOW), the chip wakes up as expected when the configured pins are both LOW, but I have a problem I always get 0 as a return from esp_ext1_wakeup_status() trying to know which one caused the wakeup or even if both did.

I know that this function returns 0 when the wakeup reason is any thing other than DeepSleep , but I always have the wakeup cause as ESP_SLEEP_WAKEUP_EXT1 as returned by this function esp_sleep_get_wakeup_cause and DEEPSLEEP_RESET as return from this function rtc_get_reset_reason(0)

I am setting the "Delay for deep sleep stub" option = 2000, I even increased it to 5000

I don't have this problem when setting wakeup mode to "ANY_HIGH".

If the mode is ESP_EXT1_WAKEUP_ALL_LOW then don't you already know that they are ALL LOW?

WiFive wrote:If the mode is ESP_EXT1_WAKEUP_ALL_LOW then don't you already know that they are ALL LOW?

Well, I need to Know which pin cased the wakeup when going LOW. I know I can do it the other way around using "ANY_HIGH" but that's the way the hardware is setup... and esp32 documentation does not mention that it is not possible.

Since they all have to be low to wake up do you mean the last pin to go low? I don't think that would be stored in any registers.

WiFive wrote:Since they all have to be low to wake up do you mean the last pin to go low? I don't think that would be stored in any registers.

Ok, well it sounds logical what you say, but I find it strange that this is not mentioned in the description of API esp_sleep_get_ext1_wakeup_status

it mentions that it will return 0 only in case the wakeup source is not DeepSleep. or at least that what I understood.

Thanks