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Orange Pi Zero Pin16,18(PA19,PA18) high at boot

sunzone
in Allwinner sunxi

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Hello.

When my orange pi zero is booted,  Pin16,18(PA19,PA18)  seems to record high value(3.3v)

I want the pins to stay low.

 

In the dtb file, PA18 and PA19 are assigned to i2c1 and i2s0. 

But in the /boot/armbianEnv.txt file those overlays are not enabled.

image.png.57fc1ec9ff71b77073af841bd316d1a1.png

 

Can someone please help me how to keep ping 16 and 18 low at t he boot time?

 

Image used: ARMBIAN 5.38 stable Ubuntu 16.04.4 LTS 4.14.18-sunxi

Thank You.

 

  • Author

Hi,

After some more digging, I found out that this happens because of hardware.

This is due to the Orange Pi Zero board's pull up resistors attached to the specified pins.

After removing the pull-up resistors, Pin16,18(PA19,PA18) did not record high value at the bootup.

Thanks.

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