[beagleboard] RE: systemd and autorun/Seth

[Mala Dies]

Hello,

Can we use Python software in our autorun folder?

Seth

P.S. If not, what book can I get so I can change this factor? I would like 
to make this software run on boot and I would like to use cloud9's autorun 
for our BBGW/BBB.

-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/365895cb-fd72-48dc-8f78-a57634a49ec6%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: [beagleboard] Running the ADC with two channels at 800 kS/s per channel (1.6 MS/s total)

[TJF]

Hi Arend, thanks for sharing your project!

Am Samstag, 23. September 2017 10:42:45 UTC+2 schrieb Arend Lammertink:
>
> If it's a real interrupt, the arm gets like 128 samples (block_size) a 
> time and thus gets interrupted 128 times less, assuming the IIO driver 
> uses adc interrupts. 
> ...
> In this case, the voltage over the capacitor is used to switch the 
> charge and discharge control mosfets on/off, which I am currently 
> doing with the arm . I might move that to the pru as well, which would 
> improve reaction time and thus accuracy of the measurement cycle.
>

How can you improve reaction time, when you get then samples in blocks of 
128? In worst case (when your triggering value is at the beginning of the 
block) you'll add further latency.

For fast reaction time you have to evaluate the samples one-by-one, and in 
this case the maximum sampling rate is in the range of 200 to 250 kS/s. DMA 
transfer in blocks is useful for measuring tasks, but not for closed loop 
controlls.

Regards!

-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/288b7ec8-dd4f-4914-a85a-033c83e77d24%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: [beagleboard] Re: Announcing $25 PocketBeagle

[Eric Keller]

This happens at Mouser every time there is a new 'bone.  It gets sorted
eventually.


On Sat, Sep 23, 2017 at 1:01 PM, Graham  wrote:

> And this is just to get it shipped from Ft. Worth, Texas,  to a US Citizen
> in Austin, Texas.
>
> Just think what it will be like to get one outside of the U.S.
>
> --- Graham
>
> ==
>
>
>
>
>
> --
> For more options, visit http://beagleboard.org/discuss
> ---
> You received this message because you are subscribed to the Google Groups
> "BeagleBoard" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to beagleboard+unsubscr...@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/
> msgid/beagleboard/b36629ae-3c7a-4207-b3fe-2b481335ddab%40googlegroups.com
> 
> .
>
> For more options, visit https://groups.google.com/d/optout.
>

-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/CANEU9Uxu%3DG%3DiKFs_TciBY4zauWiQck1M%3DGxmUgGZYBBz8R7L-w%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.

Re: [beagleboard] xM Won't Boot, Terminal shows gibberish.

[hafezi . hossein]

Dear Jacek,

thanks for kind reply.
No actually, I have not tried using different SD card.
Have you solved similar problem using different SD card?!

On Friday, September 22, 2017 at 7:56:48 PM UTC+2, Jacek Radzikowski wrote:
>
> Did you try using different SD card?
>
> Jacek.
>
>
> On Fri, Sep 22, 2017 at 12:03 PM, > 
> wrote:
>
>> Hi eveybody,
>> Recently I have received a beagleboard-XM.
>> I experienced exactly the same problem.
>> it was running without problem. once I wanted to insert audio jack, I 
>> touched SD card, then I tried to restart the board
>> then it never boot again!!
>> Same signs, D5 remains green, D13 blinkd red when I plug the power 
>> supply. D14 just turn on (Green) and then off.
>>
>> Have any of you found a solution?
>> Thanks in advance
>>
>> On Friday, February 25, 2011 at 6:11:13 PM UTC+1, Jacek Radzikowski wrote:
>>>
>>> Recent versions of xm don't have flash memory on board. Even the early
>>> boards that shipped with flash can not boot from it. The junk you see
>>> on the terminal indicates that your board and console work properly
>>> and the board tries to boot from the serial port.
>>> The only reasonable way to boot your board is from the SD card. If the
>>> board doesn't boot with the card that shipped with it, maybe it
>>> doesn't make contact with the socket. Try bend the contacts *very
>>> gently* and see if it helps. If the board still doesn't boot, it could
>>> be that the card is defective. Download the validation image and write
>>> it to another card.
>>>
>>> regards,
>>> j.
>>>
>>>
>>> On Thu, Feb 24, 2011 at 13:14, BRebey  wrote:
>>> > I have an xM board, that won't boot;  it won't  even boot from  memory
>>> > without the SD card inserted.  I see no Video display whatsoever from
>>> > the video port.
>>> >
>>> > I hooked   up a terminal to the RS-232 port, and all I see  when I
>>> > power up is maybe 30  characters or so of gibberish.   The terminal is
>>> > set to 115200-8-N-1 as instructed.I've  verified proper operation
>>> > of  the terminal by connecting it to another terminal with matching
>>> > settings, and I  can type in either window and see the characters in
>>> > the other.
>>> >
>>> > When I connect the terminal to the xM, I am NOT USING  A NULL MODEM
>>> > adapter.This  seems  "wrong", but it's the only way  I appear to
>>> > be getting any characters at all (which are gibberish).  When I
>>> > connect to the board WITH a null modem adapter, the terminal receives
>>> > no characters whatsoever.
>>> >
>>> > When I boot  without the SD card inserted, shouldn't the xM  boot  to
>>> > a  default O/S?  I'm baffled  by the fact  that I not only get
>>> > gibberish characters at  the terminal, but even more so by the fact
>>> > that I only see a HANDFUL of the bad  characters.   If I had
>>> > communication difficulty,  I would think that I should at the very
>>> > least see LOTS of garbled  characters as  the O/S boots. Instead,
>>> > I only  see handful  of characters  right away, and then nothing.
>>> >
>>> > What am I doing wrong?
>>> >
>>>
>>>
>>> -- 
>>> Given a choice between two theories, take the one which is funnier
>>>
>>> -- 
>> For more options, visit http://beagleboard.org/discuss
>> --- 
>> You received this message because you are subscribed to the Google Groups 
>> "BeagleBoard" group.
>> To unsubscribe from this group and stop receiving emails from it, send an 
>> email to beagleboard...@googlegroups.com .
>> To view this discussion on the web visit 
>> https://groups.google.com/d/msgid/beagleboard/0ae46251-cfdb-4cbd-977f-17a7f2061b73%40googlegroups.com
>>  
>> 
>> .
>> For more options, visit https://groups.google.com/d/optout.
>>
>
>
>
> -- 
> Given a choice between two theories, take the one which is funnier 
>

-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/b396d3ad-269b-45ef-9bd5-94819980ec3b%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: [beagleboard] xM Won't Boot, Terminal shows gibberish.

[hafezi . hossein]

The problem was with SD card.
Using different SD card silved the problem.

Many thanks Jacek.

On Friday, September 22, 2017 at 7:56:48 PM UTC+2, Jacek Radzikowski wrote:
>
> Did you try using different SD card?
>
> Jacek.
>
>
> On Fri, Sep 22, 2017 at 12:03 PM, > 
> wrote:
>
>> Hi eveybody,
>> Recently I have received a beagleboard-XM.
>> I experienced exactly the same problem.
>> it was running without problem. once I wanted to insert audio jack, I 
>> touched SD card, then I tried to restart the board
>> then it never boot again!!
>> Same signs, D5 remains green, D13 blinkd red when I plug the power 
>> supply. D14 just turn on (Green) and then off.
>>
>> Have any of you found a solution?
>> Thanks in advance
>>
>> On Friday, February 25, 2011 at 6:11:13 PM UTC+1, Jacek Radzikowski wrote:
>>>
>>> Recent versions of xm don't have flash memory on board. Even the early
>>> boards that shipped with flash can not boot from it. The junk you see
>>> on the terminal indicates that your board and console work properly
>>> and the board tries to boot from the serial port.
>>> The only reasonable way to boot your board is from the SD card. If the
>>> board doesn't boot with the card that shipped with it, maybe it
>>> doesn't make contact with the socket. Try bend the contacts *very
>>> gently* and see if it helps. If the board still doesn't boot, it could
>>> be that the card is defective. Download the validation image and write
>>> it to another card.
>>>
>>> regards,
>>> j.
>>>
>>>
>>> On Thu, Feb 24, 2011 at 13:14, BRebey  wrote:
>>> > I have an xM board, that won't boot;  it won't  even boot from  memory
>>> > without the SD card inserted.  I see no Video display whatsoever from
>>> > the video port.
>>> >
>>> > I hooked   up a terminal to the RS-232 port, and all I see  when I
>>> > power up is maybe 30  characters or so of gibberish.   The terminal is
>>> > set to 115200-8-N-1 as instructed.I've  verified proper operation
>>> > of  the terminal by connecting it to another terminal with matching
>>> > settings, and I  can type in either window and see the characters in
>>> > the other.
>>> >
>>> > When I connect the terminal to the xM, I am NOT USING  A NULL MODEM
>>> > adapter.This  seems  "wrong", but it's the only way  I appear to
>>> > be getting any characters at all (which are gibberish).  When I
>>> > connect to the board WITH a null modem adapter, the terminal receives
>>> > no characters whatsoever.
>>> >
>>> > When I boot  without the SD card inserted, shouldn't the xM  boot  to
>>> > a  default O/S?  I'm baffled  by the fact  that I not only get
>>> > gibberish characters at  the terminal, but even more so by the fact
>>> > that I only see a HANDFUL of the bad  characters.   If I had
>>> > communication difficulty,  I would think that I should at the very
>>> > least see LOTS of garbled  characters as  the O/S boots. Instead,
>>> > I only  see handful  of characters  right away, and then nothing.
>>> >
>>> > What am I doing wrong?
>>> >
>>>
>>>
>>> -- 
>>> Given a choice between two theories, take the one which is funnier
>>>
>>> -- 
>> For more options, visit http://beagleboard.org/discuss
>> --- 
>> You received this message because you are subscribed to the Google Groups 
>> "BeagleBoard" group.
>> To unsubscribe from this group and stop receiving emails from it, send an 
>> email to beagleboard...@googlegroups.com .
>> To view this discussion on the web visit 
>> https://groups.google.com/d/msgid/beagleboard/0ae46251-cfdb-4cbd-977f-17a7f2061b73%40googlegroups.com
>>  
>> 
>> .
>> For more options, visit https://groups.google.com/d/optout.
>>
>
>
>
> -- 
> Given a choice between two theories, take the one which is funnier 
>

-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/8a255089-22e0-4415-936a-bd7e155d0e74%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[beagleboard] Reading TPS65217 INT register with interrupt

[Ahmad Fatehi]

Hi, I want to use 5V adaptor and battery for powering my beaglebone black, 
I want to detect when 5V adaptor is missed and the board is supplying from 
battery, for this I should read the INT and STATUS register of TPS65217 
 if an interrupt is issued on PMIC_INT 
pin. So probably I must access the linux kernel for TPS65217 driver and 
modify it?! From where I can access to this kernel? or how can I detect 
interrupt and read STATUS register?

-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/059aebf0-c643-4f37-9ffe-9c6c13927881%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[beagleboard] RE: Compiling and Building for MRAA and UPM modules/Seth

[Mala Dies]

Hello,

Are the MRAA and UPM modules available easy to compile for someone out 
there in showbiz land? I am asking because I have been trying to get this 
UPM module jsupm_grovegprs built and compiled. It has not worked so far.

Seth

P.S. I have the MRAA compiled for my machine and I think it is ready to 
perform but this dang UPM module is giving me the willies. 

-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/d9ee88a8-186c-42d2-9e17-a341ff4b766d%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: [beagleboard] Running the ADC with two channels at 800 kS/s per channel (1.6 MS/s total)

[John Syne]

The IIO driver uses DMA to transfer samples from the ADC to the buffer, so the 
CPU utilization is very low. Using the PRU, the ARM processor has to copy the 
Buffer from the PRU memory to ARM memory, and this causes the ARM CPU 
utilization to be higher than using the IIO driver. The IIO driver freeze up 
the PRU to do something more important.  

Regards,
John




> On Sep 22, 2017, at 3:56 PM, Jeff Andich  wrote:
> 
> Not delving into each implementation, and not knowing anything about the IIO 
> driver, I would think the PRU implementation would offload the utilization of 
> the Linux CPU (Arm9?) vs the IIO driver.   Is this true?
> 
> Also I thin the posted examples are worthwhile to those interfacing with an 
> external ADC and to those who are wanting more PRU coding examples..
> 
> regards and thanks for posting your project!
> 
> jeff
> 
> 
> 
> 
> 
> On Friday, September 22, 2017 at 11:05:55 AM UTC-5, john3909 wrote:
> You do realize that you can achieve the same sample rate with the IIO driver 
> in Linux?
> 
> Regards,
> John
> 
> 
> 
> 
>> On Sep 22, 2017, at 12:07 AM, Arend Lammertink > > wrote:
>> 
>> Hi all,
>> 
>> I just wanted to share that I managed to run the ADC unit in a BBG at 
>> (almost?) 800 kS/sec sampling two channels, which means a total sampling 
>> rate of 1.6 mS/sec. I forked a small project from rvega and played with the 
>> code. You can find my code at:
>> 
>> https://github.com/l4m4re/bbb-pru 
>> 
>> The adc code is in the apps/adc directory.
>> 
>> Perhaps this code is helpful for others, too. The PRU code configures the 
>> ADC and the current setup samples AIN-1 and AIN-2 at 800 kS/sec.
>> 
>> Regards,
>> 
>> Arend Lammertink.
>> 
>> -- 
>> For more options, visit http://beagleboard.org/discuss 
>> 
>> --- 
>> You received this message because you are subscribed to the Google Groups 
>> "BeagleBoard" group.
>> To unsubscribe from this group and stop receiving emails from it, send an 
>> email to beagleboard...@googlegroups.com .
>> To view this discussion on the web visit 
>> https://groups.google.com/d/msgid/beagleboard/e343b354-1e28-4b32-bd94-ad20fdd91f1b%40googlegroups.com
>>  
>> .
>> For more options, visit https://groups.google.com/d/optout 
>> .
> 
> 
> 
> -- 
> For more options, visit http://beagleboard.org/discuss 
> 
> --- 
> You received this message because you are subscribed to the Google Groups 
> "BeagleBoard" group.
> To unsubscribe from this group and stop receiving emails from it, send an 
> email to beagleboard+unsubscr...@googlegroups.com 
> .
> To view this discussion on the web visit 
> https://groups.google.com/d/msgid/beagleboard/6f5827cf-85ec-45c9-978a-f4e0d1f1957b%40googlegroups.com
>  
> .
> For more options, visit https://groups.google.com/d/optout 
> .

-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/BBEC839B-D260-4ED5-96EC-EDF2A0014D9B%40gmail.com.
For more options, visit https://groups.google.com/d/optout.

Re: [beagleboard] Re: Is it possible to flash bone80 onto Debian 8

[Robert Nelson]

So remove connman.

And use /etc/network/interfaces like you used to..

Regards,

On Sep 23, 2017 12:28 PM, "maxmike"  wrote:

>
> I cannot use the existing image because I have a need to allow users to
> dynamically change the ip address of a
> machine depending on installation parameters and this is really difficult
> to script with connman, unlike the old network
> manager. Replacing connman has not worked - some critical files are
> overwritten.
>
> --
> For more options, visit http://beagleboard.org/discuss
> ---
> You received this message because you are subscribed to the Google Groups
> "BeagleBoard" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to beagleboard+unsubscr...@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/
> msgid/beagleboard/edfddeaf-4e1c-4b35-bbb9-acfbb34850dd%40googlegroups.com
> 
> .
> For more options, visit https://groups.google.com/d/optout.
>

-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/CAOCHtYgR60OB4f%3DXAkshc3msb_NTE%3D%2BjnpK1t84L82LeFbhU%3DQ%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.

Re: [beagleboard] Is it possible to flash bone80 onto Debian 8

[Robert Nelson]

Yes, documented here

http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#Kernel_Options

Regards,

On Sep 23, 2017 12:24 PM, "maxmike"  wrote:

> Just got into infinite trouble - need to use industrial temp boards for
> production and I thought I could
> flash the bone80 production image onto these machines, but no joy.
> They use Linux beaglebone 4.4.68-ti-r110 #1 SMP Wed Jun 21 04:31:35 UTC
> 2017 armv7l GNU/Linux
> and the flashing process doesn't even start.
> Is this a hardware incompatibility or software problem?
>
> --
> For more options, visit http://beagleboard.org/discuss
> ---
> You received this message because you are subscribed to the Google Groups
> "BeagleBoard" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to beagleboard+unsubscr...@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/
> msgid/beagleboard/f7dee85a-6275-43c0-bd8b-5838627773a5%40googlegroups.com
> 
> .
> For more options, visit https://groups.google.com/d/optout.
>

-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/CAOCHtYhso4z38hT%3DBmhd6O817g6b_UGq9X_FZQOTmW3SBN4ZkA%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.

[beagleboard] Re: Is it possible to flash bone80 onto Debian 8

[maxmike]

I cannot use the existing image because I have a need to allow users to 
dynamically change the ip address of a 
machine depending on installation parameters and this is really difficult 
to script with connman, unlike the old network
manager. Replacing connman has not worked - some critical files are 
overwritten.

-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/edfddeaf-4e1c-4b35-bbb9-acfbb34850dd%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: [beagleboard] Re: Announcing $25 PocketBeagle

[Robert Nelson]

By from digikey.😉

On Sep 23, 2017 12:01 PM, "Graham"  wrote:

> And this is just to get it shipped from Ft. Worth, Texas,  to a US Citizen
> in Austin, Texas.
>
> Just think what it will be like to get one outside of the U.S.
>
> --- Graham
>
> ==
>
>
>
>
>
> --
> For more options, visit http://beagleboard.org/discuss
> ---
> You received this message because you are subscribed to the Google Groups
> "BeagleBoard" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to beagleboard+unsubscr...@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/
> msgid/beagleboard/b36629ae-3c7a-4207-b3fe-2b481335ddab%40googlegroups.com
> 
> .
> For more options, visit https://groups.google.com/d/optout.
>

-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/CAOCHtYh%2BTgc-u44msMhiP4PnzN-OHdWoQQ6J-qyJka-ExpUrOw%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.

[beagleboard] Is it possible to flash bone80 onto Debian 8

[maxmike]

Just got into infinite trouble - need to use industrial temp boards for 
production and I thought I could
flash the bone80 production image onto these machines, but no joy.
They use Linux beaglebone 4.4.68-ti-r110 #1 SMP Wed Jun 21 04:31:35 UTC 
2017 armv7l GNU/Linux
and the flashing process doesn't even start.
Is this a hardware incompatibility or software problem?

-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/f7dee85a-6275-43c0-bd8b-5838627773a5%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[beagleboard] Re: Announcing $25 PocketBeagle

[Graham]

And this is just to get it shipped from Ft. Worth, Texas,  to a US Citizen 
in Austin, Texas.

Just think what it will be like to get one outside of the U.S.

--- Graham

==





-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/b36629ae-3c7a-4207-b3fe-2b481335ddab%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[beagleboard] uEnv.txt missing, nfs-uEnv.txt found instead

[Charles Quarra]

Hi,

Any idea what happened with the uEnv.txt file and why it seems to be called 
different?

Also, it is safe to add:

##Disable HDMI
  optargs=capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN


to the nfs-uEnv.txt file to disable HDMI virtual cape at boot?

-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/2e4691c1-e9de-4d37-b2f3-7ef53d5a5b30%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[beagleboard] Is the BBB with HDMI virtual cape disabled compatible with capes designed for BB green?

[Charles Quarra]

I have a grove base cape that is compatible with BB green. The wiki of the 
page says that it is compatible with BBB without HDMI output. Does that 
mean that it is only compatible with the no-HDMI version, or that the HDMI 
pins have to be disabled in order to be compatible?


-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/c56b8a99-4f4e-418e-a0c0-5cc5d40180f6%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: [beagleboard] Running the ADC with two channels at 800 kS/s per channel (1.6 MS/s total)

[Arend Lammertink]

> On Friday, September 22, 2017 at 11:05:55 AM UTC-5, john3909 wrote:
>>
>> You do realize that you can achieve the same sample rate with the IIO
>> driver in Linux?
>>

No, I didn't know that. Thanks for mentioning that.


On Sat, Sep 23, 2017 at 12:56 AM, Jeff Andich  wrote:
> Not delving into each implementation, and not knowing anything about the IIO
> driver, I would think the PRU implementation would offload the utilization
> of the Linux CPU (Arm9?) vs the IIO driver.   Is this true?

I'm not really sure whether or not the call to prussdrv_pru_wait_event
is really implemented as an interrupt or that it actually polls.

In the guide,

http://processors.wiki.ti.com/index.php/PRU_Linux_Application_Loader_API_Guide

there is a call to prussdrv_start_irqthread , which is not in the
prussdrv.h (version 0.20170730 from my own repo http://beagle.tuks.nl
), so I kept the pthread code from the original source...

If it's a real interrupt, the arm gets like 128 samples (block_size) a
time and thus gets interrupted 128 times less, assuming the IIO driver
uses adc interrupts.


However, since the pru code is in c, one can also offload some further
code to the pru, depending on what one wishes to do with the samples.



In my case, for example,  I am working on a project to study the
so-called "capacitor soakage" phenomenon:

https://en.wikipedia.org/wiki/Dielectric_absorption
https://github.com/l4m4re/SoakageTester

In this application, I charge and discharge a capacitor under control
of the beagle, whereby I use the adc to measure voltage and current
over/trough the capacitor.

In this case, the voltage over the capacitor is used to switch the
charge and discharge control mosfets on/off, which I am currently
doing with the arm . I might move that to the pru as well, which would
improve reaction time and thus accuracy of the measurement cycle.


>
> Also I thin the posted examples are worthwhile to those interfacing with an
> external ADC and to those who are wanting more PRU coding examples..
>
> regards and thanks for posting your project!
>

Thanks for your comments and regards,

Arend.

-- 
For more options, visit http://beagleboard.org/discuss
--- 
You received this message because you are subscribed to the Google Groups 
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit 
https://groups.google.com/d/msgid/beagleboard/CAOYv6OMq2g1-1h1y-yhU9fCeuBcgnAtAg26df7WxhXxfSu%3DGQw%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.