Hi Robert,
I am encountering the same problem. I am using the same tutorial for the
PRU with the poster. So I used the same overlay. I am using 4.4.9-ti-rt-r26
in Ubuntu.
Whenever I added the above device tree overlay in the cape manager, only
the GPIO works. My PRU code should just be blinking P9_11 (mode 7) and
P9_27 (mode 5 or pr1_pru0_pru_r30_5).
I also have to export first the GPIO and set the direction through the
command line before the GPIO works.
So What I did is I added the code below at the bootom of
am335x-boneblack-overlay.dts and recompile using your DTC-builder.
&am33xx_pinmux {
gpio_pins: gpio_pins { // The GPIO pins
pinctrl-single,pins = <
0x070 0x07 // P9_11 MODE7 GPIO output pull‐down
0x074 0x27 // P9_13 MODE7 GPIO input pull‐down
>;
};
pru_cape_bone_pins: pru_cape_bone_pins {
pinctrl-single,pins = <
0x1a4 0x05 // P9_27 pr1_pru0_pru_r30_5, Mode5 output pull‐down
0x19c 0x26 // P9_28 pr1_pru0_pru_r31_3, Mode6 input pull‐down
>;
};
};
&ocp {
helper {
compatible = "gpio-pinmux-helper";
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&gpio_pins>;
};
};
&pruss {
pinctrl-names = "default";
pinctrl-0 = <&pru_cape_bone_pins>;
};
Now the PRU GPO works but the GPIO does not work even if I export and set
direction. So I decided to separate the PRU GPI/GPO overlay and the GPIO
overlay but then this could cause some problems with my planned
application. Is there a way to activate the GPIO with the PRU in the
am335x-boneblack-overlay.dts?
Thanks.
Kister
On Monday, April 4, 2016 at 10:55:45 PM UTC+8, RobertCNelson wrote:
>
>
>
> On Mon, Apr 4, 2016 at 9:51 AM, Xsentius <[email protected]
> <javascript:>> wrote:
>
>> Oh, that is a very precious information, I really appreciate it.
>>
>> So is there a way to see updates? Do you recommend me to go back to 3.8,
>> if it is stable?
>>
>
> Correctly set them in the overlay and don't worry about it..
>
> Regards,
>
> --
> Robert Nelson
> https://rcn-ee.com/
>
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