Hi,
I want to test the GPIO in function of my BB-xM-RevC.
Firstly I connected the ‘user button’ R149 to P10 connector pin2 (CAM_CLKA/GPIO96), so that when ‘user button’ is pressed, the GPIO96’s voltage level will be high (1.8V).
And then on BB Ubuntu, I switch to root.
cd /sys/class/gpio
root@omap:/sys/class/gpio# ls
export gpiochip128 gpiochip192 gpiochip64 unexport
gpiochip0 gpiochip160 gpiochip32 gpiochip96
root@omap:/sys/class/gpio# echo 96 > export
root@omap:/sys/class/gpio# ls
export gpiochip0 gpiochip160 gpiochip32 gpiochip96
gpio96 gpiochip128 gpiochip192 gpiochip64 unexport
root@omap:/sys/class/gpio# cd gpio96
root@omap:/sys/class/gpio/gpio96# echo in > direction
root@omap:/sys/class/gpio/gpio96# cat direction
in
root@omap:/sys/class/gpio/gpio96# cat value
0
Now whether I press the ‘user button’ or not, for many times, the ‘value’ is still 0. Why?
Thanks!
BR,
Tom