I want further information on GPIO

[mildsky]

Which system do you use? Android, Ubuntu, OOWOW or others?

Ubuntu 22.04

Which version of system do you use? Khadas official images, self built images, or others?

Khadas official image

Please describe your issue below:

Hello. I need more information about GPIO.
How much I can apply voltage to GPIO?
What happens if I accidentally apply more than that?
What is the logic level for uart_e and i2c port?
Can UART invertible?(both active low and active high possible?
It would be much better if Khadas docs has more detailed description about GPIO such like raspberrypi does raspberrypi gpio document

[Electr1]

Hello @mildsky

@mildsky

How much I can apply voltage to GPIO?

All GPIO are 3.3v tolerant, Voltage pins don’t support voltage in, the 5v, 3.3v and 1.8v pins are only VOUT. you can check the datasheet for more info regarding the I/O domain the pin falls under,

@mildsky

What happens if I accidentally apply more than that?

It can damage the system permanently.

@mildsky

What is the logic level for uart_e and i2c port?

Again, these are 3.3v logic.

@mildsky

Can UART invertible? (both active low and active high possible?

Will let you know.

Regards.