Disable internal pulldown on G#23, G#24, G#25 and G#26

smilykoch
 
Posts: 8
Joined: Mon Jul 13, 2015 8:04 am

Disable internal pulldown on G#23, G#24, G#25 and G#26

Thu Jul 28, 2016 9:45 am

Hi guys

Is there a way to disable the internal pull down resistor on G#23, G#24, G#25 and G#26 (LED1, LED2, LED3 & LED4) ?

I can see in the RT5350 datasheet that the pins have internal pull down, but i am not sure if there is a way to disable the pulldown, to use them as regular input GPIOs?

Cheers

smilykoch
 
Posts: 8
Joined: Mon Jul 13, 2015 8:04 am

Re: Disable internal pulldown on G#23, G#24, G#25 and G#26

Thu Jul 28, 2016 10:22 am

Nevermind, i checked out the VoCore schematics, and saw that the pins had external pull down resistors.. Once they were removed, they behave like every other GPIO.

smilykoch
 
Posts: 8
Joined: Mon Jul 13, 2015 8:04 am

Re: Disable internal pulldown on G#23, G#24, G#25 and G#26

Thu Jul 28, 2016 1:48 pm

Hmm.. New problem? It seems the pull down resistors are used during bootstrapping for selecting DRAM config and clk select? Is there any way to get the desired behavior of correct boot, but using the GPIOs of PHY_LED, as regular GPIO inputs?

Cheers.

Vonger
 
Posts: 730
Joined: Sun Oct 19, 2014 6:00 am

Re: Disable internal pulldown on G#23, G#24, G#25 and G#26

Fri Jul 29, 2016 2:02 am

Pulldown/up is necessary. :) And it will not effect output signal.

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