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XPD_DCDC as EXT_WAKEUP

Posted: Thu Mar 31, 2016 11:54 am
by faeton
Hi,

it is possible to use pin XPD_DCDC as external wakeup? I found in 0D - ESP8266__Pin_List__Release_15-11-2014.xlsx that XPD_DCDC can act as EXT_WAKEUP (function 3). I need a wakeup ESP from deep sleep after press the button. I know that it is possible to connect button to EXT_RSTB and call system_deep_sleep(0), but this not prevent additional system reset when the ESP working.

Re: XPD_DCDC as EXT_WAKEUP

Posted: Fri Apr 01, 2016 10:27 am
by Espressif_Kelly
Hi,

XPD_DCDC/GPIO16 cannot function as deep sleep wake-up until it has been connected to EXT_RSTB.About deep sleep wake-up, GPIO16 will give low level signal to EXT_RSTB to reset module. That's why we request GPIO16 to connect to EXT_RSTB.

You can also connect external GPIO or button to EXT_RSTB to wake-up deep sleep.

More questions, please let us know.

Thanks.

Re: XPD_DCDC as EXT_WAKEUP

Posted: Sat May 21, 2016 4:46 am
by mmcginty
We get that but what I think the OP wants, and definitely what I want, is a way to wake it up that won't cause a reset when the chip is not sleeping. In my case I am monitoring a hall-effect-based flow sensor, that could transition the pin state up to 300 times per second. I need a way to wake the chip when input from the sensor starts, but do not want that input to reset the chip every time it toggles state.