imx287 GPIO default value

[adityapatil]

hi, 

1. I am working on imx287 custom board using Linux-2.6.35.3

2. How can I keep the gpio value to be low by default.

3. After Restart my gpio are at high state 3.3v

-Thanks

Aditya

[Bio_TICFSL]

Hi Aditya,

You can program the GPIO at the initialization of the board it takes minimun time. 

First you need to export the GPIO you want to test to the user space:

echo XX > /sys/class/gpio/export

XX shall be determined by the following algorithm:

GPIOA_[B] is the GPIO you want to export, where "A" is the GPIO bank and "B" is the offset of the pin in the bank.

if the first available GPIO bank is 0 // (iMX.28, for example)
    XX = A*32 + B;
else // first GPIO bank is 1
    XX = (A-1)*32 + B;

Regards