GPIO default state

noblepepper
 
Posts: 240
Joined: Sat Nov 29, 2014 3:22 pm

GPIO default state

Thu Mar 19, 2015 12:23 am

Is a gpio in a certain state (high or low) on the rt5350 if it is unconnected? I have been playing with gpio0 and swear it was low unless I pulled it high originally. Now it seems to be high unless I pull it low.

Vonger
 
Posts: 841
Joined: Sun Oct 19, 2014 6:00 am

Re: GPIO default state

Thu Mar 19, 2015 5:56 am

This is able to fix by code. In fact, GPIO default is low, but when uboot up, it will make gpio go high(you can check uboot source, one asm file). then after linux runs, the state will be low again.

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