ESP32 Forum

Posted: **Mon Sep 21, 2020 4:38 pm**

I have a PCB where I need pullups on GPIO34-39, because I was not aware the software ones do not work. The documentation is very misleading, they should not be called GPIO at all, but I digress..

However, I also see this post that suggests you can workaround by using the RTC subsystem, but I was not able to get it to work using the Arduino framework. viewtopic.php?t=439

Is it possible to workaround at all with software, or am I forced to turn the board?

Thanks.

Posted: **Mon Sep 21, 2020 4:54 pm**

Did you read that whole post you linked? They said they made a fix for it.

ESP_Sprite wrote: ↑
Wed Nov 16, 2016 2:26 am
Fixed here: https://github.com/espressif/esp-idf/co ... 1f0b413ac4 (That commit already is in master, by the way, if you update esp-idf you should get the fixed code.)

Posted: **Mon Sep 21, 2020 5:35 pm**

As I mentioned, it does not appear to work. Either I am misunderstanding this change, or it is not used when using the Arduino framework.

I also tried using:

Code: [Select all] [Expand/Collapse]

rtc_gpio_set_direction(myport , RTC_GPIO_MODE_INPUT_ONLY);
rtc_gpio_pullup_en(myport);

Posted: **Mon Sep 21, 2020 8:22 pm**

No workaround for 34-39

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