Using GPIO0 and GPIO3 for I2C or I2S

rohansingh
Posts: 8
Joined: Mon May 14, 2018 2:07 pm

Using GPIO0 and GPIO3 for I2C or I2S

Postby rohansingh » Wed Dec 04, 2019 8:48 pm

I have a device with a large number of connections, and I'm trying to conserve as many GPIO pins as possible.

Would it be safe to use GPIO0 and GPIO3 with the I2C or I2S peripherals? I know these pins are needed by the serial bootloader, but they aren't needed once application code is running, right?

rohansingh
Posts: 8
Joined: Mon May 14, 2018 2:07 pm

Re: Using GPIO0 and GPIO3 for I2C or I2S

Postby rohansingh » Fri Dec 06, 2019 6:15 pm

I've verified this experimentally and it does actually work. I'm able to detect an I2C device and read registers, even while using the serial monitor. I assume that sending bytes via the monitor could cause issues, but I don't plan to be doing that in my use case.

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