Hello everyone, I'm trying to run an example of PRU to flash a led and I'm
using P9_41 and P9_27, but to no working.
Can someone help me?
I created a dts and accredited that is correct, see the output of the
show-pins.pl script:
P9.31 / hdmi audio clk 100 A13 fast rx down 7 gpio 3.14
P9.29 / hdmi audio fs 101 B13 fast rx down 7 gpio 3.15
P9.30 102 D12 fast rx down 7 gpio 3.16
P9.28 / hdmi audio data 103 C12 fast rx down 7 gpio 3.17
P9.42b 104 B12 fast rx down 7 gpio 3.18
*P9**.27* 105 C13 fast 7 gpio 3.19
pruss@4a300000 (pinmux_pru_pru_pins)
*P9**.41* 106 D13 fast 7 gpio 3.20
pruss@4a300000 (pinmux_pru_pru_pins)
P9.25 / audio osc 107 A14 fast rx down 7 gpio 3.21
P9.41 / jtag emu3 109 D14 fast rx down 7 gpio 0.20
Here my DTS:
/dts-v1/;
/plugin/;
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/pinctrl/am33xx.h>
/ {
// This determines which boards can use this DTS overlay
compatible = "ti,beaglebone", "ti,beaglebone-green",
"ti,beaglebone-black";
// I think part-number is supposed to correspond with the filename,
// so we'd save this as "PRU-GPIO-MTV-00A0.dts".
part-number = "PRU-GPIO-MTV";
version = "00A0";
exclusive-use =
"P9.41", "P9.27", "pru0";
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
example_pins: pinmux_pru_pru_pins {
pinctrl-single,pins = <
0x1a8 0x0f
0x1a4 0x0f
>;
};
};
};
// This enables the PRU and assigns the GPIO pins to it for use in EGP
mode.
fragment@1 {
target = <&pruss>;
__overlay__ {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&example_pins>;
};
};
};
Em domingo, 5 de novembro de 2017 12:51:29 UTC-2, Jason Kridner escreveu:
>
>
>
> > On Nov 5, 2017, at 8:54 AM, Robert Nelson <[email protected]
> <javascript:>> wrote:
> >
> >> On Sun, Nov 5, 2017 at 12:26 AM, Alek Mabry <[email protected]
> <javascript:>> wrote:
> >> Everything seems to work up until:
> >>
> >> debian@beaglebone:/var/lib/cloud9/2ecf864e1b3f250bad82c0eae12b7b64$
> sudo
> >> config-pin p9.30 pruout
> >>
> >> P9_30 pinmux file not found!
> >>
> >> bash: /sys/devices/platform/ocp/ocp*P9_30_pinmux/state: No such file or
> >> directory
> >>
> >> Cannot write pinmux file:
> /sys/devices/platform/ocp/ocp*P9_30_pinmux/state
> >
> > P9_30 = hdmi audio
> >
> > https://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_Overlays
> >
> > So you add:
> >
> > disable_uboot_overlay_audio=1
> >
> > to /boot/uEnv.txt
>
> Looks like I chose a bad pin for a good default demo. This is a different
> pin than used for the on-board LED. I tried to show both a PRU GPIO (via
> p9.30) and an OCP GPIO via the on-board LED.
>
> So, the LED still blinks because it is a different line that is controlled
> via the OCP GPIO rather than the PRU GPIO.
>
> >
> > Regards,
> >
> > --
> > Robert Nelson
> > https://rcn-ee.com/
> >
> > --
> > For more options, visit http://beagleboard.org/discuss
> > ---
> > You received this message because you are subscribed to the Google
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>
>
> > For more options, visit https://groups.google.com/d/optout.
>
--
For more options, visit http://beagleboard.org/discuss
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