Hi all!.
Struggling with GPIO inputs. Outputs work as expected but inputs are
driving me nuts.
I have unloaded all default overlays from Debian and created my own with
BBB Overlay generator. Tried to put P8_37 (PIN P8.3) into input modes with
0x27, 0x37, 0x67.
If it was with pulldown when i measured voltage between Pin and GND it was
always ~2.6V and 'value' file was reading as HIGH (1). So i said ok, since
i get take it down to less than 0.8V (LOW) and then put 3.3V on that pin
and get HIGH i will revert it, so changed mode to be pullup, checked
voltage to GND and it was ~3.3V (great!), so i said, ok i will put it down
by toughing GND to Pin so it drops to LOW. No chance, value still reads as
1. What am i doing wrong guys?
My example overlay file:
/dts-v1/;
/plugin/;
/{
compatible = "ti,beaglebone", "ti,beaglebone-black";
part_number = "BS_PINMODE_P8_3_0x27";
exclusive-use =
"P8.3",
"gpio1_6";
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
bs_pinmode_P8_3_0x27: pinmux_bs_pinmode_P8_3_0x27 {
pinctrl-single,pins = <0x018 0x27>;
};
};
};
fragment@1 {
target = <&ocp>;
__overlay__ {
bs_pinmode_P8_3_0x27_pinmux {
compatible = "bone-pinmux-helper";
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&bs_pinmode_P8_3_0x27>;
};
};
};
};
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