I'm having some trouble using the digital gpios of the arduino header. I'm using the "imx6ul-14x14-evk-btwifi" device tree, but I can't set nor read any gpio.
I've found in the "i.MX 6UltraLite EVK Board Hardware User’s Guide" that array:
I assumed that, for example, if I want to set the pin D7 high, I'll have to work with the gpio 32*3 + 7 = 103 in Linux. I got no error when I export the pin, write its direction etc... but nothing is happening.
Must I change something in the device tree? I must say I'm not really used to work with these beasts.