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Configure GPIO in iMX6UL-EVK

Question asked by Dao Van Toan on Sep 12, 2019
Latest reply on Sep 18, 2019 by Dao Van Toan

Hi NXP,

My name is Toan. And I'm using iMX6UL-EVK. Currently, I'm trying to configure GPIO and get a trouble. In schematic, I see that pin D2 is usable as GPIO and find out number of pin. And I found that pin is gpio1.IO[25]. Because It's belong to GPIO1 so I don't need to plus with any value. Then I executed: 

$ echo 25 > /sys/class/gpio/export

$ echo "out" > /sys/class/gpio/gpio25/direction

$ echo 1 > /sys/class/gpio/gpio25/value

Then I test with a LED  but the light is quite weak. Then I try to set: 

echo 0 > /sys/class/gpio/gpio25/value

But the LED is still lighting. 

I tried to test with 3.3V power in this board, LED is light very strong. 

 

What should I do now ? Do I do wrong somewhere ?

 

Thank you so much,

      Toan

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