Also now I checked whether uio_pruss is loaded:
root@beaglebone:~# lsmod
Module Size Used by
c_can_platform 6564 0
c_can 9605 1 c_can_platform
can_dev 11455 1 c_can
spidev 6739 0
tieqep 8510 0
pwm_tiehrpwm 4546 0
pwm_tiecap 3492 0
8021q 17344 0
garp 5975 1 8021q
mrp 7322 1 8021q
stp 1911 1 garp
llc 5257 2 stp,garp
pru_rproc 11099 0
usb_f_acm 7180 1
u_serial 10646 3 usb_f_acm
usb_f_rndis 22734 1
g_multi 5316 0
usb_f_mass_storage 42745 2 g_multi
u_ether 12028 2 usb_f_rndis,g_multi
libcomposite 43810 4 usb_f_acm,usb_f_rndis,g_multi,
usb_f_mass_storage
pruss 14686 1 pru_rproc
omap_rng 4358 0
rng_core 7441 1 omap_rng
snd_soc_davinci_mcasp 17352 0
snd_soc_edma 1150 1 snd_soc_davinci_mcasp
spi_omap2_mcspi 10681 0
uio_pdrv_genirq 3521 0
uio 8467 1 uio_pdrv_genirq
cfg80211 399381 0
rfkill 17701 2 cfg80211
Seems like it is not. I have pruss and pru_rproc but not uio_pruss. Can
that be the problem?
I tried loading it:
root@beaglebone:~# modprobe uio_pruss
modprobe: FATAL: Module uio_pruss not found.
However I could not. Any ideas?
On Monday, April 4, 2016 at 3:04:59 PM UTC+3, Xsentius wrote:
>
> I am trying a PRU example from Derek Molloy's book, however whatever I do,
> pin values do not change. Could you please check what I am doing wrong?
>
>
> dts file:
>
>
> /* Device Tree Overlay for enabling the pins that are used in Chapter 13
> * This overlay is based on the BB-PRU-01 overlay
> * Written by Derek Molloy for the book "Exploring BeagleBone: Tools and
> * Techniques for Building with Embedded Linux" by John Wiley & Sons, 2014
> * ISBN 9781118935125. Please see the file README.md in the repository root
> * directory for copyright and GNU GPLv3 license information.
> */
> /dts-v1/;
> /plugin/;
>
>
> / {
> compatible = "ti,beaglebone", "ti,beaglebone-black";
>
>
> part-number = "EBB-PRU-Example";
> version = "00A0";
>
>
> /* This overlay uses the following resources */
> exclusive-use =
> "P9.11", "P9.13", "P9.27", "P9.28", "pru0";
>
>
> fragment@0 {
> target = <&am33xx_pinmux>;
> __overlay__ {
>
>
> gpio_pins: pinmux_gpio_pins { // The GPIO pins
> pinctrl-single,pins = <
> 0x070 0x07 // P9_11 MODE7 | OUTPUT | GPIO pull-down
> 0x074 0x27 // P9_13 MODE7 | INPUT | GPIO pull-down
> >;
> };
>
>
> pru_pru_pins: pinmux_pru_pru_pins { // The PRU pin modes
> pinctrl-single,pins = <
> 0x1a4 0x05 // P9_27 pr1_pru0_pru_r30_5, MODE5 | OUTPUT |
> PRU
> 0x19c 0x26 // P9_28 pr1_pru0_pru_r31_3, MODE6 | INPUT |
> PRU
> >;
> };
> };
> };
>
>
> fragment@1 { // Enable the PRUSS
> target = <&pruss>;
> __overlay__ {
> status = "okay";
> pinctrl-names = "default";
> pinctrl-0 = <&pru_pru_pins>;
> };
> };
>
>
> fragment@2 { // Enable the GPIOs
> target = <&ocp>;
> __overlay__ {
> gpio_helper {
> compatible = "gpio-of-helper";
> status = "okay";
> pinctrl-names = "default";
> pinctrl-0 = <&gpio_pins>;
> };
> };
> };
> };
>
>
>
>
> I compile with:
>
> dtc -O dtb -o EBB-PRU-Example-00A0.dtbo -b 0 -@ EBB-PRU-Example.dts
>
>
>
> then copy it under /lib/firmware and do:
>
> sudo sh ‐c "echo EBB‐PRU‐Example > $SLOTS"
>
> Then I check:
>
>
> $SLOTS output:
>
>
> xsentius@beaglebone:~/chp13/overlay$ cat $SLOTS
> 0: PF---- -1
> 1: PF---- -1
> 2: PF---- -1
> 3: PF---- -1
> 6: P-O-L- 0 Override Board Name,00A0,Override Manuf,EBB-PRU-Example
>
>
>
> dmesg output:
>
> [ 701.582790] bone_capemgr bone_capemgr: slot #6: override
> [ 701.582839] bone_capemgr bone_capemgr: Using override eeprom data at
> slot 6
> [ 701.582892] bone_capemgr bone_capemgr: slot #6: 'Override Board
> Name,00A0,Override Manuf,EBB-PRU-Example'
> [ 701.584950] bone_capemgr bone_capemgr: slot #6: dtbo
> 'EBB-PRU-Example-00A0.dtbo' loaded; overlay id #0
>
>
> Everything seems normal up to here, but when I check pin values:
>
>
> xsentius@beaglebone:~/chp13/overlay$ sudo cat $PINS|grep '103\|105'
> pin 103 (44e1099c.0) 00000027 pinctrl-single
> pin 105 (44e109a4.0) 00000027 pinctrl-single
>
> Those pins values seem not changed. They should be equal to 26 and 5.
> Do you have an idea?
>
> Here are my system properties:
>
> xsentius@beaglebone:~/chp13/overlay$ uname -a
> Linux beaglebone 4.1.18-ti-rt-r56 #1 SMP PREEMPT RT Thu Mar 31 00:22:06
> UTC 2016 armv7l GNU/Linux
> xsentius@beaglebone:~/chp13/overlay$ dtc --version
> Version: DTC 1.4.1-g1e75ebc9
>
>
>
> Thanks
>
>
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