s are all
in the latest Xenomai, which should be released Real Soon Now...mostly
waiting on some stuff from the 3.10 kernel, IIRC.
Credit to Robert C Nelson for the initial versions of the kernel and
image build scripts (also on github). THANKS!
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he older Philips I2C spec:
http://www.eng.auburn.edu/~nelson/courses/elec5260_6260/39340011.pdf
The following section 18.1.1 includes a review of the circuit operation.
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signature.asc
Description: OpenPGP digital signature
x27;t expect it to be a newbie oriented HOWTO code example.
> Or, examples of the PRU talking to things on the i2c or SPI buses.
>
> Has anyone gotten the PRU to control a quadcopter?
No to both of the above, AFAIK.
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t I haven't used them recently and can't
vouch for how well they work:
http://bb-lcnc.blogspot.com/2013/06/beagle-bone-pru-links.html
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use sudo to copy the file to where you want it.
...or, coerce the redirection to occur after the sudo, perhaps with
something like:
sudo -A su -c "dtc -I dtb -O dts am335x-boneblack.dtb >
am335x-boneblack.dts_orig"
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RU was already setup, and I
know the PRU program loading code works.
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s so
> nothing calls it yet. (the idea it should only be run once..)
I drop an init script into /etc/init.d that removes itself once it runs:
https://github.com/RobertCNelson/omap-image-builder/blob/master/machinekit/scripts/100.init.shr#L2
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>> anybody post me the links where I can find the PT patched 3.8. kernel ?
>>
>> Thanks,
>> Jeshwanth
>> Bangalore
>>
>
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the time! :)
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uming you
have the pinmux setup properly). You can only drive a limited number of
the BeagleBone header pins using PRU direct I/O, and a lot of the pins
are shared with the LCD/HDMI interface.
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alf, but at least the pencil seems to re-appear mysteriously several
days after vanishing. Probably some law about the conservation of
energy or something...
;-)
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to see if they will mesh
well with your ADC's interface.
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rollers and have a second display that way, but you won't
have access to it via conventional Linux constructs like the frame
buffer interface.
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"boot
> button" option does not seem to work.
The boot button completely bypasses the on-board eMMC, so if your 'bone
is not booting correctly from SD card when holding the boot button
during reset, you need to re-image the SD card.
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that can
modify the contents of memory directly. That is the same as any other
DMA enabled I/O device, and requires the same care with handling of the
memory regions.
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are if the LCD panel uses differential
high-speed signaling, and you might need some hardware to drive the
back-light.
Dig up a manual on the LCD panel (or otherwise figure out the pinout)
and see.
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ing the 5V aux supply for the 'Bone, you don't
need to worry about turning the ATX supply on or having a proper load on
the higher-current 5V and 12V lines. Just hook up two wires and you're
done. :)
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For more options, visit
ked in the ignore/ipipe and I do not see this patch.
>
> Regards,
> John
>
>
>
>
>
>
>
> On 9/30/13 8:12 PM, "Charles Steinkuehler"
> wrote:
>
>> AFAIK, preempt-rt on the 3.8 kernel is either brand new or still a work
>> in process. T
more building the ipipe patch from
scratch, and the BeagleBone ipipe pre/post patches have been removed
from my repo.
Let me know if you have any issues when building.
On 10/8/2013 2:54 PM, Charles Steinkuehler wrote:
> This is probably due to the very recent release of the newest official
> v
ur wish-list 512K shared memory region. :)
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On 10/08/13 21:48, Przemek Klosowski wrote:
> On Tue, Oct 8, 2013 at 8:50 PM, Charles Steinkuehler
> wrote:
>
>> Ah well...maybe someone will write a virtual AVR emulator for the PRU,
>> then you could have *THREE* Arduino's on a Tre!
>
> Now this is crazy, b
do need to make sure you're using a version of pasm that
supports these instructions. The first version from TI didn't.
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us bits of the INTC, it's interrupt number 3), you're getting
timeouts from not having a "matched set" of XIN/XOUT pairs.
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If you want, I'll send you some of the local 8-bit brew:
http://www.tallgrassbeer.com/beers/8-bit
...it's the least I can do for all your contributions to the community!
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On 10/11/2013 7:49 AM, Robert Nelson wrote:
> On Thu, Oct 10, 2013 at 8:43 PM, Charles Steinkuehler
> wrote:
>> On 10/10/2013 7:09 PM, Robert Nelson wrote:
>>> Regression/testing:
>>> Are we missing any kernel config settings from 3.8 that you used?
>>> D
thing or if you spot any goofs.
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xcnc/blob/MachineKit-ubc/src/hal/drivers/hal_pru_generic/pru_generic.p#L135
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To u
ting a complex SoC like the AM3359 up and running
(low-level hardware initialized properly so you can do things like talk
to DRAM and send serial messages out the UART) is a non-trivial task.
I'd start with their examples and tweak the startup code if/when you
have the need.
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7;re asking about it, though, I figured I should share the
'magic'. :)
Now does anyone know who to push this to so it gets into the upstream
BeagleBone kernel patch-set for 3.8?
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are is already
mounted and the files are visible when the kernel is trying to find the
overlays. Depending on your boot sequence and kernel settings, this may
or may not work.
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You
u want to see how to apply the Xenomai patches to your
own kernel tree.
Note that a working ipipe patch and pre/post patches for the Bone kernel
are now part of the latest Xenomai release.
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st.patch
>> 5- you can resume to generic installation instructions.
Yes, those are the instructions for patching the BeagleBone kernel
source manually and can be safely ignored if you're using my github
repository. In my repo, the above patching is done for you by the
scripts,
e easiest would just be a
software loop, or you can use the IEP timer documented in the latest PRU
reference manual, or many other options. More detail about exactly what
you're trying to do, what you've tried, and your design constraints will
probably get you more useful help.
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On 11/22/2013 5:08 AM, Ozan Çağlayan wrote:
> On Thu, Nov 21, 2013 at 10:49 PM, Charles Steinkuehler
> wrote:
>> On 11/20/2013 9:30 AM, Ozan Çağlayan wrote:
>>> I enabled the virtual PRU cape using device tree overlay and
>>> successfully compiled and launched
d, if you ever make a
Linux syscall from a xenomai task, you have lost any real-time
performance guarantees. The Linux kernel can hold your task off for as
long as it wants, potentially hundreds of milliseconds or more.
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For more optio
27;re building from scratch.
But copying uImage (ie: the Linux kernel) from a yocto build probably
isn't what you want to do if you're still trying to run a Xenomai kernel.
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Y
dtbs, etc. to their
respective locations).
I haven't used the tools/install_kernel.sh script...I'm sure it works
for it's intended purpose, but I'm not sure exactly which OS flavors are
supported, if you have to pass it any parameters, etc. If you want to
use it, crawl thro
el to your boot image and/or
built a bootable SD card image from scratch, I'm wondering why you're
trying to build from source in the first place...
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ort of poor mans
hot-plug infrastructure. The loading of overlays works mostly OK, but
unloading an overlay is a very good way to make your system totally
unstable and/or cause kernel panics.
To unload a device tree overlay cleanly, you have to reboot.
:(
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y convenient, and downright
amazing, when you consider what the underlying device tree was intended
to support. It sure beats rebooting *AND* having to edit your board.dto
file! :)
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is no problem in computer science which cannot be solved by one
more level of indirection."
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"Beagle
via the
>> boardzoo.com website:
>>
>> http://boardzoo.com/index.php/beaglebone/bone-bebopr.html
>>
>>
>> Dave Anders
>> Circuitco
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You received
will be more patient and give it some more time now that I know for sure
> I am on the correct trail.
>
> Thanks!
> Dave
>
> On Monday, December 9, 2013 5:20:42 PM UTC-6, Charles Steinkuehler wrote:
>>
>> The only way to get a BeBoPr+ is to buy it directly from Bas, t
;hot" must-have Christmas toy and I
didn't notice? :)
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To unsubscribe from t
tock, but can't say
> how accurate that is.
>
> And yes, all our distributors reported a big uptick in demand.
> Unfortunately they did not plan for such an event. There is no history to
> fall back on so planning is hard to do.
>
> Gerald
>
>
> On Wed, D
gt;
>
> I know he has helped me personally and I will always be grateful for all
> the help he has given me.
>
> Regards,
> John
>
> On 12/18/13, 6:30 AM, "Charles Steinkuehler"
> wrote:
>
>> Wow! Well congratulations to beagleboard.org!
>>
&g
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>> For more options, visit https
ke I said I am a newbie to the BBB.
>
> Respectfully,
> Dan Metcalf
> On Dec 23, 2013 7:27 PM, "Charles Steinkuehler"
> wrote:
>
>> Actually, VDD_5V is raw 5V power, connected directly to the DC power
>> jack. It is absolutely possible to power the Beagle
ages work on all of the
Beagle family boards (and even some others).
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To unsu
stays off.
In addition to the average value of 5V, the BeagleBone needs a stable 5V
value that doesn't have large swings away from the 'typical' 5V value or
the on-board power controller will go into under- or over- voltage
lock-out mode and the system will shut down.
Put a
e difficult to recover from. If you're using an SD
card, you can just pop it into another system to fix the problem, and
with network booting, you don't even have to do that, you can just swap
kernel files around and reboot in seconds.
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F
or
longer) based on clock phasing and configured operating frequencies.
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ed *BOTH*
of the HDMI overlays (the normal one and the one without audio)?
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if you only disable BB-BONELT-HDMI.
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download them each time?
Create a system.sh file:
https://github.com/RobertCNelson/bb-kernel/blob/am33x-v4.1/system.sh.sample#L14-L18
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here "address" is the IP address you're "assigning", and
hw_address is the target MAC address.
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.x kernels and device tree
changesets, but I haven't tried. In theory it might work on 3.8 if
you made each LED it's own "cape", so you'd unload the LED cape to
restore user access to the GPIO pin, but unloading device trees in 3.8
is mostly a handy way to crash the kernel.
ave tried 7.8 and 8.2 and either is really different.
>>
>> I was looking around to see if I was the only one in this boat and it
>> turns out I found a post on stack exchange that describes my issue
>> perfectly.
>>
>> Unfortunately the "answer&q
setting for
GPIO2_0? It could be fighting your pull-down setting if it's set to
pull up or drive a high level.
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ely, you could modify the PRU code from the BeagleLogic
project to recognize a data/strobe handshake from the STM32 which
would get the data into the BBB where you can use the reset of the
BeagleLogic framework to buffer it in DRAM on it's way to wherever
else it's headed (network, uSD card, et
t's probably better to ask machinekit specific questions on the
machinekit Google group vs. the BeagleBoard group, but there's a lot
of overlap.
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t; Once decompiled I have the following entries for the PRUSS:
With newer kernels, you need to use the standard Linux remote-proc
interface, rather than the legacy UIO driver.
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You rece
uname -a
cat /sys/devices/bone_capemgr.*/slots
...otherwise, review the contents of the slots file and see if there's
anything unexpected.
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enabled or shut-down to save power.
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;>> where the result is -1 and then 2 seconds of measurements where the result
>>> is +1... then back to -1, etc.
>>>
>>> One explanation for this is that there is a slight phase shift between
>>> the PRU1 and PRU0 clocks.
>>>
>>> ...But
e and dedicating an entire
PRU core to just measuring edges. And fortunately, the AM3358 is
aimed at industrial control so it has several fancy timers (and
capture/compare units, and quadrature encoder inputs, and PWM outputs,
and other great stuff!) ready for you to use! :)
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nd PRU cores, and have
the proper memory flags setup so the ARM core will not cache reads.
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can
configure the hardware timers to capture on the rising and/or falling
edge of a signal, and have the timer interrupt the ARM core. This
provides cycle-level accuracy for timing, and you should be able to
implement everything using the exiting Linux kernel drivers for the
timer hardware.
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as does both keyboards.
>> What gives?
>>
>> I need the hub because I need a mouse, keyboard, and webcam. Re-booting
>> with the dongle attached to the hub again yields no working mouse/keyboard.
>>
>>
>
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s to do filtering/mixing.
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gt;
>> The examples in http://beagleboard.org/cookbook have all be tested to
>> work. Handling of corner cases is a bit wonky in 0.2.5, but I'm hopeful
>> that moving to the 4.1 kernel and using pinmux helpers rather than
>> dynamically creating device trees will redu
I've been poking around in 8.2, and there are interesting differences
> compared to 7.9.
>
> A bash script run after boot can set up the pins?
>
> On Friday, January 22, 2016 at 5:48:25 PM UTC-5, Charles Steinkuehler wrote:
>>
>> "pinmux helper" is a ke
default, I set the pull-up/down for input pins based on the pin's
default state at reset (most are pull-down):
https://github.com/cdsteinkuehler/beaglebone-universal-io/blob/master/cape-universal-00A0.dts#L608-L609
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ock up into bits which might not necessarily have contiguous
>> addresses.
>>
>> If I can count on contiguous addresses, this radically simplifies the
>> memory access code in the PRU. If I can't... well, then I can't, and I've
>> got to figure so
h
the same. The interesting bits related to the uio_pruss driver usage
start with "DMA mappings" on page 445, with a discussion of coherent
buffers beginning on the next page.
Good luck!
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assembly and C: 6.6 "Interfacing C and C++ with Assembly Language".
http://www.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=spruhv7a
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>
8540 S 1.0 3.2 0:02.70 Xorg
> 1135 machine+ 20 03100 1252808 R 0.7 0.2 0:00.51 top
> 1112 machine+ 20 09208 1596924 S 0.3 0.3 0:00.08 sshd
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On 4/10/2016 11:13 AM, Charles Steinkuehler wrote:
> I am experimenting with getting Machinekit running on Debian Jessie,
> and have run into an issue with loading capes.
>
> After I manually load a cape:
>
> $ SLOTS=/sys/devices/bone_capemgr.*/slots
> $ sudo -A su -c &quo
On 4/10/2016 3:17 PM, Charles Steinkuehler wrote:
> On 4/10/2016 11:13 AM, Charles Steinkuehler wrote:
>> I am experimenting with getting Machinekit running on Debian Jessie,
>> and have run into an issue with loading capes.
>>
>> After I manually load a cape:
service file. Here's a fairly simple walk-through:
http://n3mesisfixx.blogspot.com/2012/08/migrate-etcinittab-job-to-systemd-in.html
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r add some appropriate
scaling so you can directly connect the .raw output pin to your pwmgen
input.
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&
with range 0-4000
> from
> 0-1,8V (AIN0). I use machinekit,debian 3.8. and beagle bone black (own
> cape).Thanks
>
> 2016-04-20 16:06 GMT+02:00 Charles Steinkuehler <mailto:char...@steinkuehler.net>>:
>
> On 4/20/2016 8:15 AM, Matus Kamensky wrote:
>
On 4/10/2016 3:36 PM, Charles Steinkuehler wrote:
> On 4/10/2016 3:17 PM, Charles Steinkuehler wrote:
>> On 4/10/2016 11:13 AM, Charles Steinkuehler wrote:
>>> I am experimenting with getting Machinekit running on Debian Jessie,
>>> and have run into an issue with loa
On 4/21/2016 7:32 PM, Robert Nelson wrote:
> On Thu, Apr 21, 2016 at 7:25 PM, Charles Steinkuehler
> <mailto:char...@steinkuehler.net>> wrote:
>
> OK, this doesn't appear to be a PRU issue, it's a fundamental problem
> with udev. The systemd-udevd proc
ot;. :)
Now I just save each and every datasheet I ever download from the
internet. Usually, the latest version is what I need, but sometimes
there are details in the older versions that got removed in a
subsequent update.
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On 4/21/2016 7:41 PM, Charles Steinkuehler wrote:
> On 4/21/2016 7:32 PM, Robert Nelson wrote:
>> On Thu, Apr 21, 2016 at 7:25 PM, Charles Steinkuehler
>> > <mailto:char...@steinkuehler.net>> wrote:
>>
>> and of course, i never added who pinged m
On 4/21/2016 9:37 PM, Robert Nelson wrote:
>
> Does the uio_pruss still work if we just nuke that whole udev rule??
Testing
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On 4/21/2016 9:43 PM, Charles Steinkuehler wrote:
> On 4/21/2016 9:37 PM, Robert Nelson wrote:
>>
>> Does the uio_pruss still work if we just nuke that whole udev rule??
>
> Testing
Commenting the first line (with SYMLINK+=):
==
No excessive CPU usage when load
>> https://www.adafruit.com/products/2076
>>
>> ???
>>
>> --- Graham
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"Beag
is now set, so it'll
> install
> the sgx modules by default for v4.4.x-ti kernel's going forward..
Great news!
Any progress on getting an sgx accelerated desktop, or are we still
waiting on wayland?
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Charles Steinkuehler
char...@steinkuehler.net
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AM335x CPUs available?!? ;-)
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Charles Steinkuehler
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ing names are just a convention.
This can be cumbersome (and potentially quite confusing) in a dynamic
environment, but if you're just running an automated programming
script you should be fine.
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Charles Steinkuehler
char...@steinkuehler.net
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f single bits, but that
will depend on how you have the PRU I/O pinned out and if you can
tolerate the extra overhead in the ARM to PRU communications.
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Charles Steinkuehler
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You received this message becau
ts without slowing down the code, but you'll have to be
pre-calculating the next outputs instead of busy-waiting in the clock
delay loops.
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Charles Steinkuehler
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You received this message becau
struction works with any
register field from 8 to 32 bits, but not with single bits.
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Charles Steinkuehler
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overlay.
If you need more help, please provide specific details regarding
exactly what you need to do, which kernel you are using, and what you
have already tried that didn't work.
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Charles Steinkuehler
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For more options, visit http://beagleboard.org/discuss
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ontrol out of the I2C device-tree entry and into
something like my Universal Cape overlay, then setting the default
mode of the mux to I2C. That way the pins are I2C at startup, then
can be switched to GPIO (or any other supported function) at run-time.
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Charles Steinkuehler
char...@steinkueh
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