Hi guys!
I have a strange problem with my beaglebone black board and I couldn't find
a solution. I created/generated some device tree files for some IOs and I
observed that for some pins, have a " default" high voltage. I mean that
after I load the dtbo, on those pins set as inputs with no pull-up/down and
with no input connected, I can read value 1 instead of 0 as normally.
For example, on P8_42 I have this behaviour and this is the device tree:
/*
* This is a template-generated file from BoneScript
*/
/dts-v1/;
/plugin/;
/{
compatible = "ti,beaglebone", "ti,beaglebone-black";
part_number = "BS_PINMODE_P8_42_0x2f";
exclusive-use =
"P8.42",
"gpio2_11";
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
bs_pinmode_P8_42_0x2f: pinmux_bs_pinmode_P8_42_0x2f {
pinctrl-single,pins = <0x0b4 0x2f>;
};
};
};
fragment@1 {
target = <&ocp>;
__overlay__ {
bs_pinmode_P8_42_0x2f_pinmux {
compatible = "bone-pinmux-helper";
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&bs_pinmode_P8_42_0x2f>;
};
};
};
};
I noticed this behaviour only for P8_43,P8_44,P8_41 and P8_42. For others
IOs pins that have similar device tree files ( set up as inputs, with
pullup/down disabled, in mode 7->gpio) everything seems perfect.
Can someone tell me why only for those 4 pins I have that behaviour?
I have installed Debian OS with kernel version 3.8.13-bone79 .
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