Re: [beagleboard] Is it possible to use BeagleBone Blue without an internet connection?

[Robert Nelson]

On Mon, Jan 21, 2019 at 7:34 PM Taylor White  wrote:

> Here's where I'm at now:
>
> I can't compile programs with rc libraries. I was trying to use some the
> examples from strawsondesign.com and getting the following error:
> fatal error: rc/led.h: no such file or directory
>
> I was concerned about this because it doesn't look like there are any
> files or directories loaded on the BeagleBone Blue. When I logged on
> initially with SSH, I just saw a "bin" directory with no files it in.
>

When that "bin" directory exists in the user home, it get's auto-added to
the $PATH variable, it's empty because, that's your easy place to copy
bin's..



> It seem like I need the librobotcontrol package at a minimum to run these
> examples. The Installation section of the strawsondesign.com manual says
> that the correct images should have the librobotcontrol packages
> pre-installed. I used cat /etc/dogtag to figure out what version I have.
>
> cat /etc/dogtag
> BeagleBone.org Debian Image 2017-04-09
>
> The recommended version is 2018-10-07 BeagleBone Blue Flasher Image
> (checksum). My plan is to try and get this image loaded using Etcher, which
> hopefully works with Windows 10. If this doesn't work or doesn't have the
> librobotcontrol directories than I'll try to install librobotcontrol from
> the github repository manually. Manually installation doesn't look straight
> forward as I had hoped. I'm guessing that I have to download on the files
> from the repository (https://github.com/StrawsonDesign/librobotcontrol)
> on to a CD, transfer everything to the BBone Blue, and run the install.sh
> script.
>
>
All those projects and the librobotcontrol git repo is available in the
default 2018-10-07 image..

Regards,

-- 
Robert Nelson
https://rcn-ee.com/

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[beagleboard] Re: Can BeagleBone Black's OS booting time could be a problem in a harsh vibrational environment?

[thejodenis14]

>
> Hi Dennis, 

Thank you for your detailed comment, and sorry for my late response!

>What does the monitoring do? Log to persistent memory? Send telemetry 
>via a radio link? Activate a self-destruct if the parameters go out of 
>range?

The monitoring will acquire data from a sensor during the flight, and send 
them to the general flight system (using normal electrical wire) which will 
send everything back with radio link. So we can say that the board will not 
be the main computer in the system, but just an external data collector 
(collect-compress-send). We plan to add redundancy to prevent data 
corruption.

What is your opinion about Graham's suggestion; PocketBeagle working with 
freeRTOS 
with TI starterware?

I really like your Arduino DUE suggestion, how would you compare his speed 
versus the PocketBeagle's? 

Arduino DUE:
- Microcontroller with clock speed of 84MHz (AT91SAM3X8E)
- SRAM of 96KB (Two banks: 64KB and 32KB)

PocketBeagle:
- Processor Ocatvo Systems OSD3358 1GHz ARM Cortex-A8
- 512MB DDR3 RAM Integrated

I don't get how to compare a Processor with RAM versus a Microcontroller 
with SRAM. (I know that the SRAM is faster than the RAM, but how I could 
know in advance which is faster?)

Thank you a lot for your time 

JD

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Re: [beagleboard] Re: BBB wifi

[david rediger]

 Dennis,As I said before I am a newbie and will ask a lot of rookie questions. 
I have enrolled in a Linux Course on EdX. I have experience in DOS even though 
Linux works on a different convention I can relate a lot of the protocols to 
DOS.
I did a 'ls' to '/etc/udev/rules.d/' 
here are the results:
50-hidraw.rules     80-gpio-noroot.rules        83-eqep-noroot.rules  
beagle-tester.rules50-spi.rules           81-pwm-noroot.rules       
84-gpio-noroot.rules    tisdk.rules60-omap-tty.rules  82-gpio-config-pin.rules  
85-gpio-noroot.rules    uio.rules
My BBB is not WiFi capable either. Hence the Dongle.The dongle came with a 
disk. Is the driver I need on that disk and if so: How do I get it to my 
BBB?How do I active the dongle with it?
If the directories need admin permission how do I unlock it to change the 
directories I need?
v/r David
On Sunday, January 20, 2019, 1:42:07 PM CST, Dennis Lee Bieber 
 wrote:  
 
 On Sat, 19 Jan 2019 16:43:10 + (UTC), david rediger
 declaimed the following:

> ~$ sudo chmod ugo+w /etc/udev/rules.d/99-com.rules
>No such file or directory
>

    Use the file YOU have available... My example was for the file on my
RPi (I don't have a WiFi capable BeagleBone).



-- 
    Wulfraed                Dennis Lee Bieber        AF6VN
    wlfr...@ix.netcom.com    HTTP://wlfraed.home.netcom.com/ 

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Re: [beagleboard] Re: BBB wifi

[david rediger]

 Found this workaround in GIT Hub:

2001:331b D-Link Corp. DWA-121 rev B1
   
   -
Very small and cheap device.

   -
Supported by the rtl8188eu driver, but isn't detected yet by the driver 
supplied with the ev3dev-stretch beta.
   
Workaround:   
Create a new udev rule   
nano /etc/udev/rules.d/99-dwa121.rules   
And add the following line:   
ACTION=="add", ATTRS{idVendor}=="2001", ATTRS{idProduct}=="331b", 
RUN+="/sbin/modprobe 8188eu" RUN+="/bin/sh -c 'echo 2001 331b > 
/sys/bus/usb/drivers/r8188eu/new_id'"

But when I try to create it I get a message if I do not have permission.
How do I get permission? is there some sort of password I have to use?
On Sunday, January 20, 2019, 1:42:07 PM CST, Dennis Lee Bieber 
 wrote:  
 
 On Sat, 19 Jan 2019 16:43:10 + (UTC), david rediger
 declaimed the following:

> ~$ sudo chmod ugo+w /etc/udev/rules.d/99-com.rules
>No such file or directory
>

    Use the file YOU have available... My example was for the file on my
RPi (I don't have a WiFi capable BeagleBone).



-- 
    Wulfraed                Dennis Lee Bieber        AF6VN
    wlfr...@ix.netcom.com    HTTP://wlfraed.home.netcom.com/ 

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Re: [beagleboard] Is it possible to use BeagleBone Blue without an internet connection?

[Taylor White]

Here's where I'm at now:

I can't compile programs with rc libraries. I was trying to use some the
examples from strawsondesign.com and getting the following error:
fatal error: rc/led.h: no such file or directory

I was concerned about this because it doesn't look like there are any files
or directories loaded on the BeagleBone Blue. When I logged on initially
with SSH, I just saw a "bin" directory with no files it in. It seem like I
need the librobotcontrol package at a minimum to run these examples. The
Installation section of the strawsondesign.com manual says that the correct
images should have the librobotcontrol packages pre-installed. I used cat
/etc/dogtag to figure out what version I have.

cat /etc/dogtag
BeagleBone.org Debian Image 2017-04-09

The recommended version is 2018-10-07 BeagleBone Blue Flasher Image
(checksum). My plan is to try and get this image loaded using Etcher, which
hopefully works with Windows 10. If this doesn't work or doesn't have the
librobotcontrol directories than I'll try to install librobotcontrol from
the github repository manually. Manually installation doesn't look straight
forward as I had hoped. I'm guessing that I have to download on the files
from the repository (https://github.com/StrawsonDesign/librobotcontrol) on
to a CD, transfer everything to the BBone Blue, and run the install.sh
script.



Virus-free.
www.avast.com

<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

On Sun, Jan 20, 2019 at 3:43 PM Jim F  wrote:

> Look for the rc_ commands. There are a whole bunch of them in your path
> somewhere which test the BB blue features.
>
> rc_test_drivers is one of them. There are others. You can probably find a
> useful one and look at its source to get ideas on how to do some of what
> you want. God help you if you need to mess around with device tree or uboot
> overlays, there is no reliable information or support on that for the Blue
> anywhere.
>
> J
>
> On Sun, Jan 20, 2019, 5:07 PM Taylor White  wrote:
>
>> Unfortunately, I'm not allowed to connect anything to the secure network.
>> I'm only allowed to download and write to an external CD drive. I'm working
>> on getting permission for limited internet access in the lab, where I can
>> temporarily connect for updates only, no browsing. I believe I'll have a
>> chance to try it out this coming week.
>>
>> I think you are correct about the drivers, I probably don't need them.
>> Reading through the Getting Started guide, Step 2: Enable a network
>> connection says that operation system drivers won't be necessary with the
>> latest images. I think the image that came with the BBone Blue is recent
>> enough.
>>
>> As I mentioned, I can SSH using PuTTy into the BBone using the BBone
>> wireless. I haven't tried WinSCP yet but I'll try to that on the lab
>> computers as well. I was able to get a helloworld program working:
>>
>> #include 
>> main(){
>>  printf("hello world");
>> }
>>
>> Ultimately, I want to use the BBone Blue to drive some servos with PWM
>> signals. I'm search for c program examples to toggle the onboard LEDs and
>> use the servo motor pins.
>>
>> On Sun, Jan 20, 2019 at 8:20 AM Jim F  wrote:
>>
>>> The default install is Debian and includes quite a lot. They're just
>>> isn't anything in your home directory.
>>>
>>> As with everything it's much easier with internet, but you can copy
>>> files to a cdr and then load them on the BB via your host computer that you
>>> SSH from. It's a pain but I've done it. Dependency management is hell, of
>>> course. As you've seen so far, you don't need windows drivers, so you
>>> should be pretty good.
>>>
>>> Not sure what kind of air gapped network lets you just bring in images
>>> willy-nilly, but you seem to have gotten around that so far, so look for bb
>>> images which already have whatever you want. There is one with a graphical
>>> environment pre-installed, for example.
>>>
>>> Good luck. Life is always better when you can apt-get.
>>>
>>> J
>>>
>>>
>>> On Sun, Jan 20, 2019, 9:27 AM TW  wrote:
>>>
 I've never used BeagleBone's before and I work in a lab with no
 internet connection, trying to get started with BeagleBone Blue boards for
 a project. The lab has Windows 10 computers, USB cables, 12V adapters, SD
 card readers, and an external CD drive. I have access to another facility
 with a secure internet connection for downloading and I can use an external
 CD drive to transfer files. I thought I could download everything off of
 the secure connection, transfer to the lab, and install but I'm having
 problems. When I tried to run the executable to install the Windows
 drivers, it failed because of no connection. Also I tried to install
 Chrome, required for the browsing

[beagleboard] Re: Kernel differences: machinekit vs. iot vs. lxqt vs. console, standalone, flasher, etc.

[alanmthomason via BeagleBoard]

This is not a complete answer, but as you've been waiting some time, here 
is the little that I know:

LXQT  Includes a graphical user interface using QT.  This takes up some 
space, so I believe the images are bigger.
IOT No GUI, so smaller.  
   reference Molloy, "Exploring Beaglebone"

Flasher  Automatically reflashes the eMMC when you put the SD card in.  
This is too dangerous for someone absent minded like me to have around, 
especially since all SD cards look the same.  The automatic flashing can be 
defused but personally I would always start with a non flasher and use 
Robert Nelson's scripts to flash the eMMC if desired.


Best of luck,

Alan

On Wednesday, January 16, 2019 at 2:17:30 PM UTC-5, pbft wrote:
>
> I've been in a cave for the past few years, working happily with an older 
> (4.4.21-ti-r47) Robert C Nelson kernel on my BeagleBone Black. I ran into 
> some problems with the system clock and thought I'd try a new kernel. I 
> discovered that there are many flavors, but I can't find a simple 
> description of the differences. I *think* I know what I need, but that's 
> not always a reliable path to happiness ;-)
>
> Is there a simple guide out there somewhere that I've missed?
>
> FWIW, I'm running headless off of a microSD card.
>

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[beagleboard] Re: boot from eMMC while sd card inserted

[Tarmo Kuuse]

Hi Markus,

On Saturday, 19 January 2019 20:53:56 UTC+2, maram@googlemail.com wrote:
>
> Hallo,
>
> I would like to use the sd card as extended harddrive to keep data on it. 
> But, whenever I reboot the BBB (Debian 9) it will try to boot from sd card, 
> even if this is not marked as bootable. How to solve the problem?
>
> Kind regards
> Markus
>

You haven't described how "try to boot" does not work for you. Does the SD 
boot succeed or does it fail, are there any error messages, etc. 

Do you have a bootable image on the eMMC? In my experience U-Boot is 
configured to attempt to boot from SD card whenever it finds anything 
bootable on it. This happens regardless of the state of the Boot button. I 
also suspect partition flags (bootable, non-bootable) are not honored. 

Anyway, I've re-partitioned and formatted my SD cards - after that my BB-s 
happily boot from eMMC. 

--
Kind regards,
Tarmo

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