[beagleboard] Thermal Printer: printing graph image does not giving clear display

[Upol Ryskulova]

Hello,
I have printed graph image using thermal printer using 
Python-Thermal-Printer  
library. But graph did not displayed clearly( you should thinken your eye 
to the image :) ). System I am trying to implement is the real time system 
which plots two graphs simultanously while reading data. First I wanted to 
export that graph images as png or bmp after the all data received and then 
do printings. But after printing random graph image I see that it may not 
be a solution. What do you suggest? Or can I print two graphs through 
printer as the display is being displayed on a lcd screen?? Which approach 
will best suit? Could you please guide me?
Thank you very much.
Regards,
Upol 

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Re: [beagleboard] Re: interfacing IP camera with BBB

[Andrew Commando]

from where did you see the video?
from another computer?
from HDMI ?

i want to build a stand alone

On Tue, Apr 7, 2015 at 6:57 AM, Arya K S  wrote:

> Hi,
>
> I connected Axis camera with bbb. But i didn't install any other drivers
> for it. i think drivers are available for all IP cameras. But the frame
> rate was more than 25fps. I used 'Mobaxterm' for watching the bbb. Open bbb
> as a root user. i have successfully completed my project in bbb. but the
> resolution should be very low , otherwise you will get 'overread' error.
> just change your frame rate and resolution.
>
> On Tue, Apr 7, 2015 at 6:07 AM, Andrew Commando 
> wrote:
>
>> Hi I want to connect also my IP camera to BBB.
>> I did it with chromium extension.
>> The frame rate are very slow :(. sgx driver should give more FPS ?
>> I try to install zoneminder & motion with no luck.
>> Did you find a solution;
>>
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Re: [beagleboard] Re: Beaglebone Black with Ubuntu flasher hanging unpredictably?

[Robert Nelson]

On Mon, Apr 6, 2015 at 11:25 PM, Andris Bjornson  wrote:
>> uname -r ?
>
>
> 3.14.22-ti-r31

Yuck, yeah there are some issues with that old version...

Please upgrade to 3.14.37-ti-r57

sudo apt-get update ; sudo apt-get install linux-image-3.14.37-ti-r57
; sudo reboot

and retest one of your units in those conditions.

Regards,

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

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[beagleboard] Re: Help with the HMC5883L magnetometer

[nandoarrieta]

did it solve the problem?

El sábado, 31 de enero de 2015, 23:24:32 (UTC-2), kurs...@gmail.com 
escribió:
>
>  Hi, 
>
> it seem that I'm able to get the data from the  HMC5883L sensor but, the 
> data is weird. The data would gain an increment of of 1 until it turn fully 
> 90 degree then suddenly jump to another number. Here the code can some1 
> look over it.
>
>  var i2c =  require('i2c');
> var address_compass = 0x1e;
> var wire1 = new i2c(address_compass, {device: '/dev/i2c-1'});
> var compassData_X = 0;
> var compassData_Y = 0;
> var compassData_Z = 0;
> var compass;
>
> wire1.writeBytes(0x00, [0x70], function(err) {})
> wire1.writeBytes(0x01, [0xA0], function(err) {})
> wire1.writeBytes(0x02, [0x00], function(err) {})
>
> setInterval(function(){ wire1.readBytes(0x03, 2, functions(err,res){
> 
> compassData_X = res[0] << 8 | res[1] ; 
> 
> compassData_Z = res[2] << 8 | res[3] ; 
> 
> compassData_Y = res[4] << 8 | res[5];
> 
> console.log("x: " + compassData_X + "y: " + compassData_Y + "z: " 
> + compassData_X ); */
>
>
> var declinationAngle = .226; //use in compass functions, value needed 
> checking with sensor
> var pi = 3.14; 
> var heading = Math.atan2(compassData_Y,compassData_X);
>
> // Once you have your heading, you must then add your 'Declination 
> Angle', which is the 'Error' of the magnetic field in your location.
> //If you cannot find your Declination, comment out this lines, your 
> compass will be slightly off.
> heading += declinationAngle;
>
> // Correct for when signs are reversed.
> if(heading < 0)
> heading += 2*pi;
> 
>  // Check for wrap due to addition of declination.
> else if(heading > 2*pi )
> heading -= 2*pi ;
>
> // Convert radians to degrees for readability.
> var headingDegrees = ((heading * 180)/pi); 
>
>
> console.log("x: " + compassData_X + " y: " + compassData_Y + " z: " + 
> compassData_Z + " uT");// Display the results 
>   
>   
> //(magnetic vector values are in micro-Tesla (uT))
> console.log('Heading: ' + headingDegrees + ' degrees' );
>
>
> })}, 1000) 
>
>
>
> Thank you, 
>
>
>
>
>
>

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[beagleboard] Re: No HDMI output on beagleBone Black

[lamdadrones]

Hi, I had no image too,
It should be open the monitor first and then the BBB.
Be sure that you plug it to an HDMI (dvi) port.
Sound basic infoz, but I have to share. Hopefuly help someone.

On Thursday, April 2, 2015 at 4:12:32 PM UTC+3, dheeraj jha wrote:
>
> Hi,
>
> We we are not able to get the HDMI output through the board, in this 
> regard we went to the ""sup...@beagleboard.org " and after 
> the back and forth communication with them they suggested for the forum:
> Below mentioned is that E-mail communication, if any one can help in this 
> regard it will be really helpful:
>
> Cnversation: 
>
> Hi 
>  
> We are not able to get the HDMI output from the Beagle bone black board on 
> the monitor which is having the resolution as 640 * 480 of HP company, only 
> an image flash for few second and then disappear after that.
> Please find in the attached screenshot name “Instance of Flash image.jpg” 
> for the same.
>  
> Following are the peripherals used by us for connecting the BeagleBone 
> Black:
>  
> 1.   Beaglebone black Rev C Board.
> 2.   VGA to Micro HDMI connector.
> 3.   5V 2.0A Micro USB Adapter.
> 4.   Monitor: HP: 640 * 480 .
> 5.   USB cable.
>  
> We are using below mentioned BeagleBone Black (eMMC flasher) image on the 
> board:
>  
>
> https://s3.amazonaws.com/angstrom/demo/beaglebone/BBB-eMMC-flasher-2013.09.04.img.xz
>  
> Please provide some solution regarding this. 
>
> SUPPORT replied: Verify the EDID information
>
> Response from our side:
>
> root@beaglebone:/sys/class/drm/card0/card0-HDMI-A-1# parse-edid edid
> parse-edid: parse-edid version 2.0.0
> parse-edid: IO error reading EDID
>  
> 2.   On further investigation I found that we need the read-edid 
> package, So then I tried to install the read-edid package using command : 
> opkg install read-edid
>  
> root@beaglebone:/ opkg install read-edid
> Unknown package
>  
> But I was not able to do so.
>  
> 3.   Also when I tried the “xrandr” command I got :
>  
> root@beaglebone:/ xrandr
> root@beaglebone:/ Can’t Open the Display
>  
> So, by no means i am able to get the EDID Information.
>  
> Can you provide some solution in this regard.
>
>  
> I am able to get the EDID information for the same monitor using the 
> Ubuntu 12.04 running on x86 board as you can see in the attached screenshot 
> “EDID information_x86 board” .
>  
> So, it seems the monitor has the EDID support.
>  
> The image we flashed on the Beagleboard also contains the Xorg.conf file 
> at the path /etc/X11 as you can find in the attached screenshot “Xorg.conf” 
> do you think by adding something to this file will help.
>  
> Please guide us in this direction.
>
>  
> Thanks,
> Dheeraj
>

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[beagleboard] Re: Activation of CAN1 on 3.19 (Probably a PIN Mux Problem)

[Ben F.]

Problem partly solved:
Wrong dtb-rebuilder used... 
I used dtb-rebuilder 3.14, but needed 3.19...

Now it works, but another problem appears.
Candump works fine. I get the signals what I send from my PC.
But I can't transmit any signals via cansend. After pressing Enter: No 
Error - Nothing happens. 
And after the cansend command I even can't use candump anymore. If have to 
"restart" the canbus when I want to receive any signals. Funny thing...


Am Freitag, 3. April 2015 09:39:42 UTC+2 schrieb Ben F.:
>
> Hi there,
>
> I have some problems of activating the CAN1 Bus for my BeagleBoneBlack. 
> With 3.8.13 I activated the BUS according 
> http://www.embedded-things.com/bbb/enable-canbus-on-the-beaglebone-black/ 
> with the cape_manger and it worked quiet well. 
>
> Now I have installed 3.19 and work with dtb-rebuilder. 
> What I have done so far:
> In the file *am335x-boneblack.dts *I have outcommented those two lines:
>
> *#include "am335x-can1.dtsi"#include "am335x-bone-can1.dtsi"*
>
> After make, make install (no errors), reboot modprobe, activation of can1 
> bus etc... I get 1:1 the same result in ifconfig as in 3.8.13(with the 
> cape_manager).
>
>
>
>
>
>
> *can0  Link encap:UNSPEC  HWaddr 
> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00UP RUNNING 
> NOARP  MTU:16  Metric:1  RX packets:0 errors:0 dropped:0 overruns:0 
> frame:0  TX packets:0 errors:0 dropped:0 overruns:0 
> carrier:0  collisions:0 txqueuelen:10   RX bytes:0 (0.0 B)  
> TX bytes:0 (0.0 B)  Interrupt:71 *
>  
> But when I look at the pins in* 
> /sys/kernel/debug/pinctrl/44e10800.pinmux/pins* I get:
>
> *pin 96 (44e10980.0) 0037 pinctrl-singlepin 97 (44e10984.0) 0037 
> pinctrl-single*
>
> and for
>
> * /sys/kernel/debug/pinctrl/44e10800.pinmux/pinmux-pins pin 96 
> (44e10980.0): (MUX UNCLAIMED) (GPIO UNCLAIMED)pin 97 (44e10984.0): (MUX 
> UNCLAIMED) (GPIO UNCLAIMED)*
>
> In 3.8.13 (where it works) I have those values:
> In */sys/kernel/debug/pinctrl/44e10800.pinmux/pins*
>
> *pin 96 (44e10980) 0012 pinctrl-singlepin 97 (44e10984) 0032 
> pinctrl-single*
>
> and for 
> */sys/kernel/debug/pinctrl/44e10800.pinmux/pinmux-pins*
> *pin 96 (44e10980): 481d.d_can (GPIO UNCLAIMED) function dcan1_pins_s0 
> group dcan1_pins_s0pin 97 (44e10984): 481d.d_can (GPIO UNCLAIMED)* 
>
>
> *function dcan1_pins_s0 group dcan1_pins_s0*So it looks like that the MUX 
> has not been set. Anybody a Idea for a solution in the dtb-rebuilder or 
> another idea?
>
> Thanks in advance!!
> Best greetings from Austria.
>
> Benjamin 
>

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Re: [beagleboard] Re: Beaglebone black : Using Systemd service to make wireless stable is not working as expected

[Brian Anderson]

Connman is installed in the latest Debian Jessie full testing images. It works 
fine for me for managing WiFi.  I can't say whether Connman is installed in the 
console images as I have not used them.  I posted some additional information 
in this thread: 
https://groups.google.com/forum/m/#!category-topic/beagleboard/rRHUR8mltmg

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[beagleboard] Stand alone IP camera system

[Andrew Lopito]

Hi, everyone!

days now Im trying to make a standalone system  - IP cam > 100 meters 
distance > BBB > Monitor -
my board is Beaglebone Black Rev.c
img without eMMC flashed Debian 2015-03-01 

4Mbps transfer rate from ipcam to pc is the highests value

what i need is:
IP camera (foscam V.2) connected via Ethernet (input)
and see from HDMI (output) 

I did it with a chromium extension. but the frame rate is very low about 5 
FPS (at ./top chromium shows using 50% cpu)

at the low right of the screen "CPU Usage monitor" shows 90-95% usage 
(green) 
when i close chromium using ip cam extension goes to 10-15% cpu usage 
i try setting low/up quality, bitrate, nothing much...

does sgx driver should help? 
  
I try to install zoneminder & motion with no luck.
I still make tries, as installation folder is other than wiki says maybe 
BBB shoud eMMC flashed, and the only version is Angstrom. 


and to be honest as i watch some video for zoneminder i dont think this 
program offer over 10 FPS 

my really problem is when i connect to camera (through browser) need to 
download a plugin, that is unfortunately is ipwebcomponents.exe :(

I test the camera on windows environment and works fine.
 

until some answers  i try installing opencv

I try not to use web camera because i need Pan Tilt and that will add +1 
BBB. servos, code... and more.

Ideas / Suggestions are welcomed !

.

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[beagleboard] Should I try PyBBIO ?

[Andrey Somov]

Hi all,
does anyone use the PyBBIO library (https://github.com/graycatlabs/PyBBIO) ?

I am not sure it is actively maintained.

1) there is no single unit test
2) when I run 'library_test.py' it fails with an import error
3) 'BBIOServer_test.py' also fails to run
4) the code is hardly documented
5) the code does not follow the PEP 8 guideline
6) I created an issue but there is no reply for more then a week

Which Python library would you recommend to use for SPI ?

Cheers,
Andrey

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[beagleboard] BBB: RS232/UARTs send "break" during power up

[smith . winston . 101]

I have a MAX3232 connected to UART5 on a BBB.  During power up; presumably 
before the dtb has been loaded to set the pinmux for the UART, I see a 
"break" sequence being sent.  A break sequence is defined as "tx held low 
for a duration longer than 1 frame".

Seems like pinmuxing won't help because it occurs too late.  According to 
the am335x data sheet the "zero state" for the corresponding pin is Z which 
presumably means the pin will be low (i.e. "emitting" 0's) until the pinmux 
takes over and configures it as a UART pin which presumably brings it to 
idle (high).

Any ideas how to avoid this?

Thanks,


-W

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[beagleboard] Re: Beaglebone black not booting when circuitry connected

[smith . winston . 101]

On Monday, April 6, 2015 at 2:32:55 PM UTC-4, star...@gmail.com wrote:
>
> Hello there, I have been working on a robotics project using the 
> beaglebone black and have just run into some difficulty.
>
> I am using a protocape for holding all of my circuitry to various sensors. 
> While the protoboard is connected, the board turns on but does not boot. 
> When I disconnect the protocape, my board turns on and boots normally. This 
> happened in between runs with no changes made.
>

Sounds to me like you're shorting something on your protocape.  Check your 
pin usage, particularly the power/gnd pins.  Also look for shorts on the 
protoboard (again, pwr/gnd lines), I know it's easy to make mistakes on the 
protoboards.

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[beagleboard] simple cap touch cape?

[Drew Fustini]

anyone see a cape with cap touch functionality?

along the lines of:
Adafruit 12 x Capacitive Touch Shield for Arduino - MPR121
https://www.adafruit.com/products/2024

if not, i'm think i might give a crack at making a cape with a chip
like the MPR121 or the AT42QT1070.


thanks,
drew

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Re: [beagleboard] Re: Beaglebone black not booting when circuitry connected

[Graham Haddock]

You don't have to short anything out for what he is describing to happen.

The BBB-Sitara uses a field of 100K resistors, which are either pull-ups or
pull-downs
on 15 different lines, pinned out from P8-31 through P8-46, which instructs
it how to boot.

Any load on any of these pins, of lower than several hundred thousand Ohms,
can derail the boot process.

You can only load those pins after the Sitara has completed booting.

BBB System Reference Manual, Version C1, page 106.

--- Graham

==



On Tue, Apr 7, 2015 at 1:26 PM,  wrote:

>
> On Monday, April 6, 2015 at 2:32:55 PM UTC-4, star...@gmail.com wrote:
>>
>> Hello there, I have been working on a robotics project using the
>> beaglebone black and have just run into some difficulty.
>>
>> I am using a protocape for holding all of my circuitry to various
>> sensors. While the protoboard is connected, the board turns on but does not
>> boot. When I disconnect the protocape, my board turns on and boots
>> normally. This happened in between runs with no changes made.
>>
>
> Sounds to me like you're shorting something on your protocape.  Check your
> pin usage, particularly the power/gnd pins.  Also look for shorts on the
> protoboard (again, pwr/gnd lines), I know it's easy to make mistakes on the
> protoboards.
>
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Re: [beagleboard] libpruio with recent Debian on BBB?

[Brandon Stafford]

Hi TJF,

It seems that I got excited too soon.

If I load libpruio-00A0.dtbo like this (as root):

 echo libpruio >  /sys/devices/bone_capemgr.9/slots

the overlay appears to load, but the pins are not configured. Here's what
shows up in dmesg:

[  136.836467] bone-capemgr bone_capemgr.9: part_number 'libpruio', version
'N/A'
[  136.836647] bone-capemgr bone_capemgr.9: slot #7: generic override
[  136.836691] bone-capemgr bone_capemgr.9: bone: Using override eeprom
data at slot 7
[  136.836738] bone-capemgr bone_capemgr.9: slot #7: 'Override Board
Name,00A0,Override Manuf,libpruio'
[  136.836990] bone-capemgr bone_capemgr.9: slot #7: Requesting part
number/version based 'libpruio-00A0.dtbo
[  136.837037] bone-capemgr bone_capemgr.9: slot #7: Requesting firmware
'libpruio-00A0.dtbo' for board-name 'Override Board Name', version '00A0'
[  136.849312] bone-capemgr bone_capemgr.9: slot #7: dtbo
'libpruio-00A0.dtbo' loaded; converting to live tree
[  136.976389] bone-capemgr bone_capemgr.9: slot #7: #3 overlays
[  137.311770] omap_hwmod: pruss: failed to hardreset
[  137.328365] pruss_uio 4a30.pruss: pins are not configured from the
driver
[  137.335639] bone-capemgr bone_capemgr.9: slot #7: Applied #3 overlays.

Subsequently, the ADC works as before, but the button example fails:

➜  libpruio-0.2  sudo src/examples/button
1
sh: echo: I/O error
pin re-configuration failed (pinmux failed: P8_07 -> x7F)
press any key to quit

Any suggestions about how to proceed from here? Is it a problem with the
uio_pruss module? Or with libpruio?

Brandon


On Thu, Apr 2, 2015 at 2:53 AM, TJF  wrote:

> Thanks for feedback, Brandon.
>
> Am Mittwoch, 1. April 2015 20:00:02 UTC+2 schrieb Brandon Stafford:
>>
>> I was able to execute:
>>
>> sudo echo libpruio >  /sys/devices/bone_capemgr.9/slots
>>
>> That produced this in dmesg:
>> ...
>>
> [  796.652764] omap_hwmod: pruss: failed to hardreset
>>
>
> I also get this message here, but it works for me. (It seems that some
> driver programmers learned to output error messages at m$.)
>
>
>> After this, the analog pins worked as expected:
>>
>
> ADC always works, no matter which overlay you used to switch the PRUSS on.
> The question is: can you execute examples with run-time pinmuxing, like
> button or stepper?
>
> BR
>
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-- 
Brandon Stafford
Rascal Micro: small computers for art and science
Somerville, MA, USA

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[beagleboard] Re: BBB: RS232/UARTs send "break" during power up

[Graham]

The GPIO pins on most processors, are open inputs until configured.
So a weak pull up resistor to +3.3V (not the switched +3.3V) on the TX line 
between the Sitara pin and the MAX3232 input would likely fix your problem.
Once configured, the TX line will overpower the weak pull up resistor.

--- Graham

==


On Tuesday, April 7, 2015 at 11:31:47 AM UTC-5, smith.wi...@gmail.com wrote:
>
> I have a MAX3232 connected to UART5 on a BBB.  During power up; presumably 
> before the dtb has been loaded to set the pinmux for the UART, I see a 
> "break" sequence being sent.  A break sequence is defined as "tx held low 
> for a duration longer than 1 frame".
>
> Seems like pinmuxing won't help because it occurs too late.  According to 
> the am335x data sheet the "zero state" for the corresponding pin is Z which 
> presumably means the pin will be low (i.e. "emitting" 0's) until the pinmux 
> takes over and configures it as a UART pin which presumably brings it to 
> idle (high).
>
> Any ideas how to avoid this?
>
> Thanks,
>
>
> -W
>

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[beagleboard] Re: BBB: RS232/UARTs send "break" during power up

[smith . winston . 101]

On Tuesday, April 7, 2015 at 5:36:55 PM UTC-4, Graham wrote:

> The GPIO pins on most processors, are open inputs until configured.
> So a weak pull up resistor to +3.3V (not the switched +3.3V) on the TX 
> line between the Sitara pin and the MAX3232 input would likely fix your 
> problem.
> Once configured, the TX line will overpower the weak pull up resistor.
>

That's what I was afraid of.  Sadly, the connected peripheral doesn't 
respond well to the break (I'm guessing it's missing it's pullups for the 
RX line).  I did try rebuilding u-boot with UART5 enabled in the hope that 
it would get configured sooner, but it appears the break happens 
immediately at power up before *anything* has happened.

I shall try a 10K pulllup on the TX line.

Thanks for the feedback!


-W

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Re: [beagleboard] simple cap touch cape?

[ybeagle3]

On Tuesday, April 07, 2015 15:21:00 Drew Fustini wrote:
> anyone see a cape with cap touch functionality?
> 
> along the lines of:
> Adafruit 12 x Capacitive Touch Shield for Arduino - MPR121
> https://www.adafruit.com/products/2024
> 
> if not, i'm think i might give a crack at making a cape with a chip
> like the MPR121 or the AT42QT1070.

Along these lines, does anyone know if the MSP430 touch sense stuff can be made 
to work with the AM335x's PRUs? Supposely, they work with any MSP430 but some 
of them have pins are that are more optimized for this use. 


> 
> 
> thanks,
> drew

--
Hunyue Yau
http://www.hy-research.com/

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[beagleboard] how to identify what files would be compiled

[Shyam D]

I want to understand the GPIO framework of the linux, so i want to have a 
look at the source, but not sure what files would be compiled in the gpio 
folder looking at source , i know i can find it if i compile and see the 
obj folder i may find ,

 please let me know , if there is any file which would convey what files of 
a module lets say GPIO or SPI or any peripheral will be compiled

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Re: [beagleboard] Re: Beaglebone black : Using Systemd service to make wireless stable is not working as expected

[Upol Ryskulova]

Hello Brian, sorry for not giving full information about BBB, mine is
debian wheezy latest stable image (3.8.13-bone70). How can I get stable
wireless in this wheezy? For one week wireless was stable but now it is
not. hdmi is not disabled.

On Tue, Apr 7, 2015 at 5:23 PM, Brian Anderson  wrote:

> Connman is installed in the latest Debian Jessie full testing images. It
> works fine for me for managing WiFi.  I can't say whether Connman is
> installed in the console images as I have not used them.  I posted some
> additional information in this thread:
> https://groups.google.com/forum/m/#!category-topic/beagleboard/rRHUR8mltmg
>
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Re: [beagleboard] Re: Beaglebone black : Using Systemd service to make wireless stable is not working as expected

[Upol Ryskulova]

Now, oddly it got its' static IP address after the boot. When I ping, it 
hangs there. Also I cannot connect to BBB using its static IP address. 
I removed all services that enables wireless except service that I created 
for ifup and ifdown currently available wlan interface.

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