GPIO 9 and 10 (Pin D2 and D3) usability for UART

rammkumar
Posts: 4
Joined: Wed Apr 22, 2020 5:35 am

GPIO 9 and 10 (Pin D2 and D3) usability for UART

Postby rammkumar » Tue Jul 21, 2020 5:18 am

Hello. Is there any software or hardware changes that I can do to use GPIO 9 and GPIO 10 (Pin D2 and D3) for UART ? When I program the esp32-wroom-32 DEVKIT-C to use pin 9 and 10 for UART, the controller starts resetting continuously . I need to use the third uart in my project, so I will be glad to know if there is any way to use it .

PS: I am aware of the fact that GPIO 9 to 10 are not recommended to use as per the datasheet. Would like to know if there is away that i can achieve this by modifying anything - hardware or software wise.

Thanks

ESP_Sprite
Posts: 9764
Joined: Thu Nov 26, 2015 4:08 am

Re: GPIO 9 and 10 (Pin D2 and D3) usability for UART

Postby ESP_Sprite » Tue Jul 21, 2020 7:44 am

You can re-route any UART to use any GPIO (but do consider the fact that some are input-only, and the fact that some indeed are used for flash), so there's no need to use exactly these pins.

zliudr
Posts: 360
Joined: Thu Oct 03, 2019 5:15 am

Re: GPIO 9 and 10 (Pin D2 and D3) usability for UART

Postby zliudr » Thu Jul 23, 2020 3:16 pm

Hi Ramm, aren't these pins for internal flash use for wrover modules? (could that be true with wroom as well?). Just in the slight case you will upgrade to wrover, it's a good idea to stay clear GPIO7 thru 11.

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