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

npwh2545
Posts: 2
Joined: Fri Feb 07, 2025 12:15 pm

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

Postby npwh2545 » 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?
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Screenshot 2025-02-07 193102.png (66.03 KiB) Viewed 1232 times
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Screenshot 2025-02-07 194732.png (26.96 KiB) Viewed 1232 times

ESP_Sprite
Posts: 9985
Joined: Thu Nov 26, 2015 4:08 am

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

Postby ESP_Sprite » 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.

npwh2545
Posts: 2
Joined: Fri Feb 07, 2025 12:15 pm

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

Postby npwh2545 » 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.

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