Unable to use gpio 16 and 17

mrdebug
Posts: 27
Joined: Sat Jul 27, 2019 8:26 am

Unable to use gpio 16 and 17

Postby mrdebug » Tue Sep 15, 2020 3:26 pm

Hi, I have esp32 development board on my desk.
Iìm trying to use gpio 16 and 17 as uarts on digital out but it does not work.
Is my development board broken or it is a normal behaviour?

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ESP_krzychb
Posts: 302
Joined: Sat Oct 01, 2016 9:05 am
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Re: Unable to use gpio 16 and 17

Postby ESP_krzychb » Tue Sep 15, 2020 6:24 pm

Hi mrdebug,

GPIO16 and 17 may be used for communication with flash or PSRAM, depending on particular chip or module that you have on your development board.

For example see the datasheet of ESP32-WROVER-E module.

ESP32-WROVER-E-flash-psram.png
ESP32-WROVER-E-flash-psram.png (439.94 KiB) Viewed 171 times

What is exact ESP32 chip variant or module that you have?

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