Which system do you use? Android, Ubuntu, OOWOW or others?
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
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,
It can damage the system permanently.
Again, these are 3.3v logic.
Will let you know.