Hello,
I'm using a Beaglebone Black with a custom cape attached to it.
I created a device tree overlay for it (see the attached mycape.dts), which
is almost working fine, except that I won't receive any events using the C
poll() function.
When I load the dts all Inputs/Outpus are muxed and exported automatically
to the sysfs as expected. But only the "edge-file" gives me a none, instead
of both.
I didn't find any documentation for this. I only found the two options
"count-rising-edge" and "count-falling-edge" which should enable the
interrupts for this pin. But so far, it does not work for me...
So is there any way I can tell the device tree that I want to watch for
both edges?
Trying to set the edge manually after loading the device tree overlay only
gives me a write error: "Device or resource busy".
If I remove the GPIO Part:
In0 { //GPIO-1[12]
gpio-name = "Input0";
gpio = <&gpio2 12 0x00>;
input;
active-low;
count-rising-edge;
count-falling-edge;
};Code hier eingeben...
and export & configure the inputs manually, the events are working!
So I think my C-Code should be fine...
I hope anyone can help me with this...
Thank you very much!
With best regards,
Sebastian
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/dts-v1/;
/plugin/;
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black";
/* identification */
board-name = "MY-CAPE";
part-number = "MY-CAPE";
version = "00A0";
/* Exclusive Pin use */
exclusive-use = "P8.07", "P8.12", "gpio_1_12", "gpio_2_2";
/* Pin-Muxing & Configuration */
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
//Inputs
input_pins: pinmux_input_pins{
pinctrl-single,pins = <
0x030 0x37 // P8_12 => GPIO-1[12]
>;
};
//Outputs
output_pins: pinmux_output_pins{
pinctrl-single,pins = <
0x090 0x0F // P8_7 => GPIO-2[2]
>;
};
};
};
fragmet@1 {
target = <&ocp>; //OnChipPeripherals
__overlay__ {
my_input_pins {
compatible = "gpio-of-helper";
//gpio-of-helper, bone-pinmux-helper
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&input_pins>;
In0 { //GPIO-1[12]
gpio-name = "Input0";
gpio = <&gpio2 12 0x00>;
input;
active-low;
count-rising-edge;
count-falling-edge;
};
};
gsf_output_pins {
compatible = "gpio-of-helper";
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&output_pins>;
Out0 { //GPIO-2[2]
gpio-name = "Output0";
gpio = <&gpio3 2 0x00>;
output;
init-low;
};
};
};
};
};
