ESP32 Forum

Posted: **Fri Feb 07, 2025 12:48 pm**

I'm a beginner and I want to know if using sar_i2c_sda_1 and i2c on GPIO3 will affect the usage of the USB Serial/JTAG Controller?

According to the topic, when using the USB Serial/JTAG Controller for code uploading and serial output, will there be any impact if I only use the USB D- and D+ for operation? Will it affect the use of GPIO3 in I2C mode?

: Screenshot 2025-02-07 193102.png (66.03 KiB) Viewed 1235 times

: Screenshot 2025-02-07 194732.png (26.96 KiB) Viewed 1235 times

Posted: **Sat Feb 08, 2025 6:14 am**

By default, all those eFuses are 0 so GPIO3 is ignored wrt configuring USB-serial-jtag, so you're free to use it for whatever.

Posted: **Sat Feb 08, 2025 3:16 pm**

ESP_Sprite wrote: ↑
Sat Feb 08, 2025 6:14 am
By default, all those eFuses are 0 so GPIO3 is ignored wrt configuring USB-serial-jtag, so you're free to use it for whatever.

Thank you very much. I have been wondering for days.

ESP32 Forum

i2c on GPIO3 will affect the usage of the USB Serial/JTAG Controller?

i2c on GPIO3 will affect the usage of the USB Serial/JTAG Controller?

Re: i2c on GPIO3 will affect the usage of the USB Serial/JTAG Controller?

Re: i2c on GPIO3 will affect the usage of the USB Serial/JTAG Controller?