Re: [beagleboard] Beaglebone clone HDMI red and blue inverted

[Jason Kridner]

> On Jan 3, 2019, at 4:01 PM, Robert Nelson  wrote:
> 
>> On Thu, Jan 3, 2019 at 3:58 PM  wrote:
>> 
>> I have the schematics and I followed them to come up with the clone. 
>> Everything on the hardware side seems correct but for some reason I get 
>> inverted red and blue.
> 
> Which just leaves your hdmi switch connection..

As I recall, there is a device tree flag to swap the colors. 

https://github.com/torvalds/linux/commit/bcc5a6f5fc9f0d53aa896768d6f86d7e64d0b783#diff-05a6dbba7c688e0ffa3e21abe47d7c15
 


> 
> Regards,
> 
> -- 
> Robert Nelson
> https://rcn-ee.com/
> 
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Re: [beagleboard] I need your help for my project

[Yiling Cao]

I managed to make QT appear in 6 seconds, cold boot on 800mhz AM3352.

Basically uboot 1 sec. kernel 2 sec. and init 2 sec and app.

need to strip some drivers, verification and use init

On Fri, Jan 4, 2019 at 4:14 AM Robert Nelson 
wrote:

> On Thu, Jan 3, 2019 at 2:07 PM Talha Ayranci 
> wrote:
> >
> > Hello everyone! Fİrst I am sorry for my bad English.
> > I want to make a project with Beaglebone Black. My project is a GUI app
> with Real-Time Kernel based Linux. And i want to run this app in 5 sec. For
> example : https://www.youtube.com/watch?v=vm3Gp9KEs1w
> >
> > I flashed a Debian image ( 1GB console image )
> > PREEMPT_RT applied and kernel is RT kernel. ( 4.14.79-ti-rt-r84 )
> > I deactivate some services for fast open.
> >
> > I want to develope a GUI app now. What should i do?
>
> For a 5 second bootup time, your going to have to do a lot of work..
>
> I'd first start with buildroot and make sure to use u-boot in falcon mode..
>
> https://git.buildroot.net/buildroot/
>
> Regards,
>
> --
> Robert Nelson
> https://rcn-ee.com/
>
> --
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-- 
Yiling Cao
http://ariaboard.com/
http://shanghainovotech.com/

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Re: [beagleboard] UART0 garbage characters

[Yiling Cao]

correct UART rate and good ground connection?

On Thu, Jan 3, 2019 at 5:37 AM Sebastián Sáez  wrote:

> Hi everyone!
>
> after install the last linux image in the emmc I can't use the UART0
> anymore (screenshot attached )
>
> All other function are working, I can do SSH using the softAP interface.
>
> Any suggestions?
> I already tried deleting uboot in emmc without lucky
>
> This is my system:
>
> debian@beaglebone:~$ sudo /opt/scripts/tools/version.sh
>> git:/opt/scripts/:[0ca42da8c7e3d81e9cbab71b1e2b0fad00bf79ca]
>> eeprom:[A335BNLTGW1ABBGW16063691]
>> model:[TI_AM335x_BeagleBone_Green_Wireless]
>> dogtag:[BeagleBoard.org Debian Image 2018-10-07]
>> bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot
>> 2018.09-2-g0b54a51eee]:[location: dd MBR]
>> kernel:[4.14.79-ti-r86]
>> nodejs:[v6.16.0]
>> uboot_overlay_options:[enable_uboot_overlays=1]
>>
>> uboot_overlay_options:[uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-14-TI-00A0.dtbo]
>> uboot_overlay_options:[enable_uboot_cape_universal=1]
>> pkg check: to individually upgrade run: [sudo apt install --only-upgrade
>> ]
>> pkg:[bb-cape-overlays]:[4.4.20190102.0-0rcnee0~stretch+20190102]
>> pkg:[bb-wl18xx-firmware]:[1.20180517-0rcnee0~stretch+20180517]
>> pkg:[kmod]:[23-2rcnee1~stretch+20171005]
>> pkg:[librobotcontrol]:[1.0.4-git20181227.0-0rcnee0~stretch+20181228]
>> pkg:[firmware-ti-connectivity]:[20180825+dfsg-1rcnee1~stretch+20181217]
>> groups:[debian : debian adm kmem dialout cdrom floppy audio dip video
>> plugdev users systemd-journal i2c bluetooth netdev cloud9ide gpio pwm eqep
>> admin spi tisdk weston-launch xenomai]
>> cmdline:[console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1
>> root=/dev/mmcblk1p1 ro rootfstype=ext4 rootwait coherent_pool=1M
>> net.ifnames=0 quiet]
>> dmesg | grep pinctrl-single
>> [1.063909] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800
>> size 568
>> dmesg | grep gpio-of-helper
>> [1.075590] gpio-of-helper ocp:cape-universal: ready
>> END
>
>
>
> garbage characters
>
> [image: uart0.png]
>
> --
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-- 
Yiling Cao
http://ariaboard.com/
http://shanghainovotech.com/

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Re: [beagleboard] Please help me

[Yiling Cao]

No, AM335x doesn't have an analog video input and hardware encoder by
itself. It can only handle network forwarding job.

also plz improve your title.

On Wed, Jan 2, 2019 at 8:45 PM ARASH FAHIM  wrote:

> HI
> I am a computer student
> I want to change analog video (PAL/NTSC) to mpeg 2 realtime and send
> output stream to another system
> Can I use BeagleBoard for this subject
>
> thank you for help me
>
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> .
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-- 
Yiling Cao
http://ariaboard.com/
http://shanghainovotech.com/

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[beagleboard] Re: opencv videocapture on beaglebone black

[thatguy722]

It anyone else stumbles on this the solution is:

sudo rmmod uvcvideo && sudo modprobe uvcvideo nodrop=1 timeout=5000

On Thursday, 18 February 2016 11:29:50 UTC+11, joelk wrote:
>
> Has anybody managed to capture video from a usb webcam on a BBB with any 
> recent Linux distribution using OpenCV cv::VideoCapture functions?
>
> I'm using a Logitech C615 which works perfectly with OpenCV on x86 PCs and 
> on a Raspberry Pi 2 (a little slow but it works) running the latest 
> Raspbian Jessie image.
>
> But I haven't yet managed to get anything but completely black images 
> running the same program on my BBB.  I've tried it with a recent Arch Linux 
> image.  I've tried Ubuntu 14.04, Debian 7.9 and 8.3 (with a few different 
> kernels) from BeagleBoard.  Nothing!  No problems doing anything else in 
> OpenCV -- it can load and display individual images and videos from files, 
> just not from the camera.  And in all of these installations I can capture 
> video from the camera with other programs (using v4l2) -- just not with 
> OpenCV.
>
> I've seen Derek Molloy's videos demonstrating use of OpenCV on a BBB -- 
> but he was running it under Angstrom, and as far as I can see the last 
> Angstrom distro was at least 3 years ago.
>
> Any suggestions for something more recent?
>
> By the way, here's a sample of a program that's fails to capture any video 
> on the BBB (it displays the frame size and then just gives a series of 
> "select timeout" messages):
>
>
> #include 
>> #include 
>>
>> int main(int argc, char *argv[]) {
>>   cv::VideoCapture cap;
>>
>>   cap.open(0);
>>
>>   if(!cap.isOpened()) {
>> std::cout << "Did not connect to camera."  << std::endl;;
>> return -1;
>>   }
>>
>>   double dWidth = cap.get(CV_CAP_PROP_FRAME_WIDTH);
>>   double dHeight = cap.get(CV_CAP_PROP_FRAME_HEIGHT);
>>
>>   std::cout << "Frame size: " << dWidth << " x " << dHeight << std::endl;
>>   cv::namedWindow("MyVideo",CV_WINDOW_AUTOSIZE);  
>>
>>   while(1) {
>> cv::Mat frame;
>> bool bSuccess = cap.read(frame);
>> if(!bSuccess) {
>>   std::cout << "failed to read frame" << std::endl;
>>   break;
>> }
>> cv::imshow("MyVideo", frame);
>> if(cv::waitKey(30) >= 0) break;
>>   }
>> 
>>   return 0;
>> }
>>
>
> Can't get much simpler than that.
>

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Re: [beagleboard] Beaglebone clone HDMI red and blue inverted

[Robert Nelson]

On Thu, Jan 3, 2019 at 3:58 PM  wrote:
>
> I have the schematics and I followed them to come up with the clone. 
> Everything on the hardware side seems correct but for some reason I get 
> inverted red and blue.

Which just leaves your hdmi switch connection..

Regards,

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

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Re: [beagleboard] Beaglebone clone HDMI red and blue inverted

[sam . abbas3]

I have the schematics and I followed them to come up with the clone. 
Everything on the hardware side seems correct but for some reason I get 
inverted red and blue.

On Thursday, January 3, 2019 at 2:49:51 PM UTC-7, RobertCNelson wrote:
>
> On Thu, Jan 3, 2019 at 3:36 PM > wrote: 
> > 
> > Yes its not. On clone, the output from NXP TDA19988, is going to a HDMI 
> switch rather than going to micro HDMI port, and the output from switch 
> goes to HDMI connector. 
> > Do TDMA pins invert somewhere from micro HDMI port to HDMI cable with 
> beaglebone? 
>
> https://github.com/beagleboard/beaglebone-black/blob/master/BBB_SCH.pdf 
>
> Regards, 
>
> -- 
> Robert Nelson 
> https://rcn-ee.com/ 
>

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Re: [beagleboard] Beaglebone clone HDMI red and blue inverted

[Robert Nelson]

On Thu, Jan 3, 2019 at 3:36 PM  wrote:
>
> Yes its not. On clone, the output from NXP TDA19988, is going to a HDMI 
> switch rather than going to micro HDMI port, and the output from switch goes 
> to HDMI connector.
> Do TDMA pins invert somewhere from micro HDMI port to HDMI cable with 
> beaglebone?

https://github.com/beagleboard/beaglebone-black/blob/master/BBB_SCH.pdf

Regards,

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

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Re: [beagleboard] Beaglebone clone HDMI red and blue inverted

[sam . abbas3]

Yes its not. On clone, the output from NXP TDA19988, is going to a HDMI 
switch rather than going to micro HDMI port, and the output from switch 
goes to HDMI connector.
Do TDMA pins invert somewhere from micro HDMI port to HDMI cable with 
beaglebone?



On Thursday, January 3, 2019 at 2:20:00 PM UTC-7, RobertCNelson wrote:
>
> On Thu, Jan 3, 2019 at 3:14 PM > wrote: 
> > 
> > Hi Robert, 
> > 
> > I tested debian-9.6 from the link you provided, and the colors on my 
> clone board are still inverted. 
> > I tested the same image on beaglebone and the colors were correct. 
> > 
> > Please see my log below for the clone: 
> > 
> > U-Boot 2018.09-2-gd5b4c4b656 (Oct 19 2018 - 14:16:02 -0500), Build: 
> jenkins- 
> > github_Bootloader-Builder-84 
> > 
> > CPU  : AM335X-GP rev 2.1 
> > I2C:   ready 
> > DRAM:  512 MiB 
> > No match for driver 'omap_hsmmc' 
> > No match for driver 'omap_hsmmc' 
> > Some drivers were not found 
> > Reset Source: Global warm SW reset has occurred. 
> > Reset Source: Power-on reset has occurred. 
> > RTC 32KCLK Source: External. 
> > MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1 
> > Loading Environment from EXT4... ** File not found /boot/uboot.env ** 
> > 
> > ** Unable to read "/boot/uboot.env" from mmc0:1 ** 
> > Board: BeagleBone Black 
> >  not set. Validating first E-fuse MAC 
> > BeagleBone Black: 
> > Timed out in wait_for_event: status= 
> > Check if pads/pull-ups of bus are properly configured 
> > BeagleBone: cape eeprom: i2c_probe: 0x54: 
> > Timed out in wait_for_event: status= 
> > Check if pads/pull-ups of bus are properly configured 
> > BeagleBone: cape eeprom: i2c_probe: 0x55: 
> > Timed out in wait_for_event: status= 
> > Check if pads/pull-ups of bus are properly configured 
> > BeagleBone: cape eeprom: i2c_probe: 0x56: 
> > Timed out in wait_for_event: status= 
> > Check if pads/pull-ups of bus are properly configured 
> > BeagleBone: cape eeprom: i2c_probe: 0x57: 
> > Net:   eth0: MII MODE 
> > cpsw, usb_ether 
> > Press SPACE to abort autoboot in 2 seconds 
> > board_name=[A335BNLT] ... 
> > board_rev=[000C] ... 
> > switch to partitions #0, OK 
> > mmc0 is current device 
> > SD/MMC found on device 0 
> > switch to partitions #0, OK 
> > mmc0 is current device 
> > Scanning mmc 0:1... 
> > gpio: pin 56 (gpio 56) value is 0 
> > gpio: pin 55 (gpio 55) value is 0 
> > gpio: pin 54 (gpio 54) value is 0 
> > gpio: pin 53 (gpio 53) value is 1 
> > switch to partitions #0, OK 
> > mmc0 is current device 
> > gpio: pin 54 (gpio 54) value is 1 
> > Checking for: /uEnv.txt ... 
> > Checking for: /boot.scr ... 
> > Checking for: /boot/boot.scr ... 
> > Checking for: /boot/uEnv.txt ... 
> > gpio: pin 55 (gpio 55) value is 1 
> > 2117 bytes read in 19 ms (108.4 KiB/s) 
> > Loaded environment from /boot/uEnv.txt 
> > debug: [dtb=am335x-boneblack.dtb] ... 
> > Using: dtb=am335x-boneblack.dtb ... 
> > Checking if uname_r is set in /boot/uEnv.txt... 
> > gpio: pin 56 (gpio 56) value is 1 
> > Running uname_boot ... 
> > loading /boot/vmlinuz-4.14.79-ti-r86 ... 
> > 9712128 bytes read in 632 ms (14.7 MiB/s) 
> > debug: [enable_uboot_overlays=1] ... 
> > debug: [enable_uboot_cape_universal=1] ... 
> > debug: [uboot_base_dtb_univ=am335x-boneblack-uboot-univ.dtb] ... 
> > uboot_overlays: [uboot_base_dtb=am335x-boneblack-uboot-univ.dtb] ... 
> > uboot_overlays: Switching too: dtb=am335x-boneblack-uboot-univ.dtb ... 
> > loading /boot/dtbs/4.14.79-ti-r86/am335x-boneblack-uboot-univ.dtb ... 
> > 161719 bytes read in 57 ms (2.7 MiB/s) 
> > uboot_overlays: [fdt_buffer=0x6] ... 
> > uboot_overlays: loading /lib/firmware/BB-BONE-eMMC1-01-00A0.dtbo ... 
> > 1440 bytes read in 55 ms (25.4 KiB/s) 
> > uboot_overlays: loading /lib/firmware/BB-HDMI-TDA998x-00A0.dtbo ... 
> > 4896 bytes read in 76 ms (62.5 KiB/s) 
> > uboot_overlays: loading /lib/firmware/BB-ADC-00A0.dtbo ... 
> > 711 bytes read in 183 ms (2.9 KiB/s) 
> > uboot_overlays: loading /lib/firmware/AM335X-PRU-RPROC-4-14-TI-00A0.dtbo 
> ... 
> > 3513 bytes read in 160 ms (20.5 KiB/s) 
> > loading /boot/initrd.img-4.14.79-ti-r86 ... 
> > 4636329 bytes read in 306 ms (14.4 MiB/s) 
> > debug: [console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 
> root=/dev/mm 
> > cblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet 
> video=H 
> > DMI-A-1:1024x768@60e] ... 
> > debug: [bootz 0x8200 0x8808:46bea9 8800] ... 
> > ## Flattened Device Tree blob at 8800 
> >Booting using the fdt blob at 0x8800 
> >Loading Ramdisk to 8fb94000, end 8ea9 ... OK 
> >reserving fdt memory region: addr=8800 size=89000 
> >Loading Device Tree to 8fb08000, end 8fb93fff ... OK 
> > 
> > Starting kernel ... 
> > 
> > [0.002388] timer_probe: no matching timers found 
> > [1.081030] wkup_m3_ipc 44e11324.wkup_m3_ipc: could not get rproc 
> handle 
> > [1.378727] omap_voltage_late_init: Voltage driver support not added 
> > [1.386104] PM: Cannot get wkup_m3_ipc handl

Re: [beagleboard] Beaglebone clone HDMI red and blue inverted

[Robert Nelson]

On Thu, Jan 3, 2019 at 3:14 PM  wrote:
>
> Hi Robert,
>
> I tested debian-9.6 from the link you provided, and the colors on my clone 
> board are still inverted.
> I tested the same image on beaglebone and the colors were correct.
>
> Please see my log below for the clone:
>
> U-Boot 2018.09-2-gd5b4c4b656 (Oct 19 2018 - 14:16:02 -0500), Build: 
> jenkins-
> github_Bootloader-Builder-84
>
> CPU  : AM335X-GP rev 2.1
> I2C:   ready
> DRAM:  512 MiB
> No match for driver 'omap_hsmmc'
> No match for driver 'omap_hsmmc'
> Some drivers were not found
> Reset Source: Global warm SW reset has occurred.
> Reset Source: Power-on reset has occurred.
> RTC 32KCLK Source: External.
> MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
> Loading Environment from EXT4... ** File not found /boot/uboot.env **
>
> ** Unable to read "/boot/uboot.env" from mmc0:1 **
> Board: BeagleBone Black
>  not set. Validating first E-fuse MAC
> BeagleBone Black:
> Timed out in wait_for_event: status=
> Check if pads/pull-ups of bus are properly configured
> BeagleBone: cape eeprom: i2c_probe: 0x54:
> Timed out in wait_for_event: status=
> Check if pads/pull-ups of bus are properly configured
> BeagleBone: cape eeprom: i2c_probe: 0x55:
> Timed out in wait_for_event: status=
> Check if pads/pull-ups of bus are properly configured
> BeagleBone: cape eeprom: i2c_probe: 0x56:
> Timed out in wait_for_event: status=
> Check if pads/pull-ups of bus are properly configured
> BeagleBone: cape eeprom: i2c_probe: 0x57:
> Net:   eth0: MII MODE
> cpsw, usb_ether
> Press SPACE to abort autoboot in 2 seconds
> board_name=[A335BNLT] ...
> board_rev=[000C] ...
> switch to partitions #0, OK
> mmc0 is current device
> SD/MMC found on device 0
> switch to partitions #0, OK
> mmc0 is current device
> Scanning mmc 0:1...
> gpio: pin 56 (gpio 56) value is 0
> gpio: pin 55 (gpio 55) value is 0
> gpio: pin 54 (gpio 54) value is 0
> gpio: pin 53 (gpio 53) value is 1
> switch to partitions #0, OK
> mmc0 is current device
> gpio: pin 54 (gpio 54) value is 1
> Checking for: /uEnv.txt ...
> Checking for: /boot.scr ...
> Checking for: /boot/boot.scr ...
> Checking for: /boot/uEnv.txt ...
> gpio: pin 55 (gpio 55) value is 1
> 2117 bytes read in 19 ms (108.4 KiB/s)
> Loaded environment from /boot/uEnv.txt
> debug: [dtb=am335x-boneblack.dtb] ...
> Using: dtb=am335x-boneblack.dtb ...
> Checking if uname_r is set in /boot/uEnv.txt...
> gpio: pin 56 (gpio 56) value is 1
> Running uname_boot ...
> loading /boot/vmlinuz-4.14.79-ti-r86 ...
> 9712128 bytes read in 632 ms (14.7 MiB/s)
> debug: [enable_uboot_overlays=1] ...
> debug: [enable_uboot_cape_universal=1] ...
> debug: [uboot_base_dtb_univ=am335x-boneblack-uboot-univ.dtb] ...
> uboot_overlays: [uboot_base_dtb=am335x-boneblack-uboot-univ.dtb] ...
> uboot_overlays: Switching too: dtb=am335x-boneblack-uboot-univ.dtb ...
> loading /boot/dtbs/4.14.79-ti-r86/am335x-boneblack-uboot-univ.dtb ...
> 161719 bytes read in 57 ms (2.7 MiB/s)
> uboot_overlays: [fdt_buffer=0x6] ...
> uboot_overlays: loading /lib/firmware/BB-BONE-eMMC1-01-00A0.dtbo ...
> 1440 bytes read in 55 ms (25.4 KiB/s)
> uboot_overlays: loading /lib/firmware/BB-HDMI-TDA998x-00A0.dtbo ...
> 4896 bytes read in 76 ms (62.5 KiB/s)
> uboot_overlays: loading /lib/firmware/BB-ADC-00A0.dtbo ...
> 711 bytes read in 183 ms (2.9 KiB/s)
> uboot_overlays: loading /lib/firmware/AM335X-PRU-RPROC-4-14-TI-00A0.dtbo ...
> 3513 bytes read in 160 ms (20.5 KiB/s)
> loading /boot/initrd.img-4.14.79-ti-r86 ...
> 4636329 bytes read in 306 ms (14.4 MiB/s)
> debug: [console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 
> root=/dev/mm
> cblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet 
> video=H
> DMI-A-1:1024x768@60e] ...
> debug: [bootz 0x8200 0x8808:46bea9 8800] ...
> ## Flattened Device Tree blob at 8800
>Booting using the fdt blob at 0x8800
>Loading Ramdisk to 8fb94000, end 8ea9 ... OK
>reserving fdt memory region: addr=8800 size=89000
>Loading Device Tree to 8fb08000, end 8fb93fff ... OK
>
> Starting kernel ...
>
> [0.002388] timer_probe: no matching timers found
> [1.081030] wkup_m3_ipc 44e11324.wkup_m3_ipc: could not get rproc handle
> [1.378727] omap_voltage_late_init: Voltage driver support not added
> [1.386104] PM: Cannot get wkup_m3_ipc handle
> [1.851328] musb-hdrc musb-hdrc.1: VBUS_ERROR in a_wait_vrise (80, 
>   retry #3, port1 0008010c
> [2.757564] tda998x 0-0070: read edid timeout
> [2.856904] hdmi-audio-codec hdmi-audio-codec.0.auto: ASoC: no source 
> widget
> found for Playback
> [2.865915] hdmi-audio-codec hdmi-audio-codec.0.auto: ASoC: Failed to add 
> rou
> te Playback -> direct -> TX
> [5.037791] tda998x 0-0070: read edid timeout
>
> Debian GNU/Linux 9 beaglebone ttyS0
>
> BeagleBoard.org Debian Image 2018-12-30
>
> Support/FAQ: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian
>
> default username:password is [debian:temppwd]
>
> beaglebone login:

Re: [beagleboard] Beaglebone clone HDMI red and blue inverted

[sam . abbas3]

Hi Robert,

I tested debian-9.6 from the link you provided, and the colors on my clone 
board are still inverted.
I tested the same image on beaglebone and the colors were correct.

Please see my log below for the clone:

U-Boot 2018.09-2-gd5b4c4b656 (Oct 19 2018 - 14:16:02 -0500), Build: 
jenkins-
github_Bootloader-Builder-84



CPU  : AM335X-GP rev 
2.1
I2C:   
ready
DRAM:  512 
MiB  
No match for driver 
'omap_hsmmc'
No match for driver 
'omap_hsmmc'
Some drivers were not 
found 
Reset Source: Global warm SW reset has 
occurred.
Reset Source: Power-on reset has 
occurred.  
RTC 32KCLK Source: 
External.
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 
1   
Loading Environment from EXT4... ** File not found /boot/uboot.env 
**   


** Unable to read "/boot/uboot.env" from mmc0:1 
**  
Board: BeagleBone 
Black 
 not set. Validating first E-fuse 
MAC  
BeagleBone 
Black:   
Timed out in wait_for_event: 
status=
Check if pads/pull-ups of bus are properly 
configured   
BeagleBone: cape eeprom: i2c_probe: 
0x54:   
Timed out in wait_for_event: 
status=
Check if pads/pull-ups of bus are properly 
configured   
BeagleBone: cape eeprom: i2c_probe: 
0x55:   
Timed out in wait_for_event: 
status=
Check if pads/pull-ups of bus are properly 
configured   
BeagleBone: cape eeprom: i2c_probe: 
0x56:   
Timed out in wait_for_event: 
status=
Check if pads/pull-ups of bus are properly 
configured   
BeagleBone: cape eeprom: i2c_probe: 
0x57:   
Net:   eth0: MII 
MODE   
cpsw, 
usb_ether 
Press SPACE to abort autoboot in 2 
seconds  
board_name=[A335BNLT] 
...   
board_rev=[000C] 
...
switch to partitions #0, 
OK 
mmc0 is current 
device  
SD/MMC found on device 
0
switch to partitions #0, 
OK 
mmc0 is current 
device  
Scanning mmc 
0:1... 
gpio: pin 56 (gpio 56) value is 
0   
gpio: pin 55 (gpio 55) value is 
0   
gpio: pin 54 (gpio 54) value is 
0   
gpio: pin 53 (gpio 53) value is 
1   
switch to partitions #0, 
OK 
mmc0 is current 
device  
gpio: pin 54 (gpio 54) value is 
1   
Checking for: /uEnv.txt 
... 
Checking for: /boot.scr 
... 
Checking for: /boot/boot.scr 
...
Checking for: /boot/uEnv.txt 
...
gpio: pin 55 (gpio 55) value is 
1   
2117 bytes read in 19 ms (108.4 
KiB/s)  
Loaded environment from 
/boot/uEnv.txt  
debug: [dtb=am335x-boneblack.dtb] 
...   
Using: dtb=am335x-boneblack.dtb 
... 
Checking if uname_r is set in 

Re: [beagleboard] I need your help for my project

[Robert Nelson]

On Thu, Jan 3, 2019 at 2:07 PM Talha Ayranci  wrote:
>
> Hello everyone! Fİrst I am sorry for my bad English.
> I want to make a project with Beaglebone Black. My project is a GUI app with 
> Real-Time Kernel based Linux. And i want to run this app in 5 sec. For 
> example : https://www.youtube.com/watch?v=vm3Gp9KEs1w
>
> I flashed a Debian image ( 1GB console image )
> PREEMPT_RT applied and kernel is RT kernel. ( 4.14.79-ti-rt-r84 )
> I deactivate some services for fast open.
>
> I want to develope a GUI app now. What should i do?

For a 5 second bootup time, your going to have to do a lot of work..

I'd first start with buildroot and make sure to use u-boot in falcon mode..

https://git.buildroot.net/buildroot/

Regards,

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

-- 
For more options, visit http://beagleboard.org/discuss
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For more options, visit https://groups.google.com/d/optout.

[beagleboard] I need your help for my project

[Talha Ayranci]

Hello everyone! Fİrst I am sorry for my bad English.
I want to make a project with Beaglebone Black. My project is a GUI app 
with Real-Time Kernel based Linux. And i want to run this app in 5 sec. For 
example : https://www.youtube.com/watch?v=vm3Gp9KEs1w

   - I flashed a Debian image ( 1GB console image )
   - PREEMPT_RT applied and kernel is RT kernel. ( 4.14.79-ti-rt-r84 )
   - I deactivate some services for fast open.

I want to develope a GUI app now. What should i do?

-- 
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/226050a5-9a74-4284-bf38-0c15fe08a73c%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: [beagleboard] Beaglebone clone HDMI red and blue inverted

[Robert Nelson]

On Thu, Jan 3, 2019 at 1:56 PM  wrote:
>
> Hi Robert,
>
> Here below is my boot log:
> """
> U-Boot 2018.09-2-gd5b4c4b656 (Oct 19 2018 - 14:16:02 -0500), Build: 
> jenkins-
> github_Bootloader-Builder-84
>
> CPU  : AM335X-GP rev 2.1
> I2C:   ready
> DRAM:  512 MiB
> No match for driver 'omap_hsmmc'
> No match for driver 'omap_hsmmc'
> Some drivers were not found
> Reset Source: Global warm SW reset has occurred.
> Reset Source: Power-on reset has occurred.
> RTC 32KCLK Source: External.
> MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
> Loading Environment from EXT4... ** File not found /boot/uboot.env **
>
> ** Unable to read "/boot/uboot.env" from mmc0:1 **
> Board: BeagleBone Black
>  not set. Validating first E-fuse MAC
> BeagleBone Black:
> Timed out in wait_for_event: status=
> Check if pads/pull-ups of bus are properly configured
> BeagleBone: cape eeprom: i2c_probe: 0x54:
> Timed out in wait_for_event: status=
> Check if pads/pull-ups of bus are properly configured
> BeagleBone: cape eeprom: i2c_probe: 0x55:
> Timed out in wait_for_event: status=
> Check if pads/pull-ups of bus are properly configured
> BeagleBone: cape eeprom: i2c_probe: 0x56:
> Timed out in wait_for_event: status=
> Check if pads/pull-ups of bus are properly configured
> BeagleBone: cape eeprom: i2c_probe: 0x57:
> Net:   eth0: MII MODE
> cpsw, usb_ether
> Press SPACE to abort autoboot in 2 seconds
> board_name=[A335BNLT] ...
> board_rev=[000C] ...
> switch to partitions #0, OK
> mmc0 is current device
> SD/MMC found on device 0
> switch to partitions #0, OK
> mmc0 is current device
> Scanning mmc 0:1...
> gpio: pin 56 (gpio 56) value is 0
> gpio: pin 55 (gpio 55) value is 0
> gpio: pin 54 (gpio 54) value is 0
> gpio: pin 53 (gpio 53) value is 1
> switch to partitions #0, OK
> mmc0 is current device
> gpio: pin 54 (gpio 54) value is 1
> Checking for: /uEnv.txt ...
> Checking for: /boot.scr ...
> Checking for: /boot/boot.scr ...
> Checking for: /boot/uEnv.txt ...
> gpio: pin 55 (gpio 55) value is 1
> 2100 bytes read in 20 ms (102.5 KiB/s)
> Loaded environment from /boot/uEnv.txt
> debug: [dtb=am335x-boneblack.dtb] ...
> Using: dtb=am335x-boneblack.dtb ...
> Checking if uname_r is set in /boot/uEnv.txt...
> gpio: pin 56 (gpio 56) value is 1
> Running uname_boot ...
> loading /boot/vmlinuz-4.9.45-ti-r57 ...
> 9464664 bytes read in 612 ms (14.7 MiB/s)
> debug: [enable_uboot_overlays=1] ...
> debug: [enable_uboot_cape_universal=1] ...
> debug: [uboot_base_dtb_univ=am335x-boneblack-uboot-univ.dtb] ...
> uboot_overlays: [uboot_base_dtb=am335x-boneblack-uboot-univ.dtb] ...
> debug: unable to find [am335x-boneblack-uboot-univ.dtb] using 
> [am335x-boneblack-
> uboot.dtb] instead ...
> debug: [uboot_base_dtb_univ=am335x-boneblack-uboot.dtb] ...
> uboot_overlays: [uboot_base_dtb=am335x-boneblack-uboot.dtb] ...
> uboot_overlays: Switching too: dtb=am335x-boneblack-uboot.dtb ...
> loading /boot/dtbs/4.9.45-ti-r57/am335x-boneblack-uboot.dtb ...
> 55752 bytes read in 36 ms (1.5 MiB/s)
> uboot_overlays: [fdt_buffer=0x6] ...
> uboot_overlays: loading /lib/firmware/BB-BONE-eMMC1-01-00A0.dtbo ...
> 1440 bytes read in 345 ms (3.9 KiB/s)
> uboot_overlays: loading /lib/firmware/BB-HDMI-TDA998x-00A0.dtbo ...
> 4920 bytes read in 219 ms (21.5 KiB/s)
> uboot_overlays: loading /lib/firmware/BB-ADC-00A0.dtbo ...
> 711 bytes read in 599 ms (1000 Bytes/s)
> uboot_overlays: loading /lib/firmware/univ-bbb-EVA-00A0.dtbo ...
> 61976 bytes read in 644 ms (93.8 KiB/s)
> loading /boot/initrd.img-4.9.45-ti-r57 ...
> 6395122 bytes read in 420 ms (14.5 MiB/s)
> debug: [console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 
> root=/dev/mm
> cblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet 
> video=H
> DMI-A-1:1024x768@60e] ...
> debug: [bootz 0x8200 0x8808:6194f2 8800] ...
> ## Flattened Device Tree blob at 8800
>Booting using the fdt blob at 0x8800
>Loading Ramdisk to 8f9e6000, end 84f2 ... OK
>reserving fdt memory region: addr=8800 size=7d000
>Loading Device Tree to 8f966000, end 8f9e5fff ... OK
>
> Starting kernel ...
>
> [0.001790] clocksource_probe: no matching clocksources found
> [2.416644] wkup_m3_ipc 44e11324.wkup_m3_ipc: could not get rproc handle
> [2.670204] omap_voltage_late_init: Voltage driver support not added
> [2.677613] PM: Cannot get wkup_m3_ipc handle
> [3.167898] musb-hdrc musb-hdrc.1: VBUS_ERROR in a_wait_vrise (80, 
>   retry #3, port1 0008010c
> [4.089472] tda998x 0-0070: read edid timeout
> [4.185191] bone_capemgr bone_capemgr: slot #0: auto loading handled by 
> U-Boo
> t
> [4.192591] bone_capemgr bone_capemgr: slot #1: auto loading handled by 
> U-Boo
> t
> [4.200032] bone_capemgr bone_capemgr: slot #2: auto loading handled by 
> U-Boo
> t
> [4.207386] bone_capemgr bone_capemgr: slot #3: auto loading handled by 
> U-Boo
> t
> [6.389654] tda998x 0-0070: read edid timeout
> rootfs: clean, 127622/217728 files, 7441

Re: [beagleboard] Beaglebone clone HDMI red and blue inverted

[sam . abbas3]

Hi Robert,

Here below is my boot log:
"""
U-Boot 2018.09-2-gd5b4c4b656 (Oct 19 2018 - 14:16:02 -0500), Build: 
jenkins-
github_Bootloader-Builder-84



CPU  : AM335X-GP rev 
2.1
I2C:   
ready
DRAM:  512 
MiB  
No match for driver 
'omap_hsmmc'
No match for driver 
'omap_hsmmc'
Some drivers were not 
found 
Reset Source: Global warm SW reset has 
occurred.
Reset Source: Power-on reset has 
occurred.  
RTC 32KCLK Source: 
External.
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 
1   
Loading Environment from EXT4... ** File not found /boot/uboot.env 
**   


** Unable to read "/boot/uboot.env" from mmc0:1 
**  
Board: BeagleBone 
Black 
 not set. Validating first E-fuse 
MAC  
BeagleBone 
Black:   
Timed out in wait_for_event: 
status=
Check if pads/pull-ups of bus are properly 
configured   
BeagleBone: cape eeprom: i2c_probe: 
0x54:   
Timed out in wait_for_event: 
status=
Check if pads/pull-ups of bus are properly 
configured   
BeagleBone: cape eeprom: i2c_probe: 
0x55:   
Timed out in wait_for_event: 
status=
Check if pads/pull-ups of bus are properly 
configured   
BeagleBone: cape eeprom: i2c_probe: 
0x56:   
Timed out in wait_for_event: 
status=
Check if pads/pull-ups of bus are properly 
configured   
BeagleBone: cape eeprom: i2c_probe: 
0x57:   
Net:   eth0: MII 
MODE   
cpsw, 
usb_ether 
Press SPACE to abort autoboot in 2 
seconds  
board_name=[A335BNLT] 
...   
board_rev=[000C] 
...
switch to partitions #0, 
OK 
mmc0 is current 
device  
SD/MMC found on device 
0
switch to partitions #0, 
OK 
mmc0 is current 
device  
Scanning mmc 
0:1... 
gpio: pin 56 (gpio 56) value is 
0   
gpio: pin 55 (gpio 55) value is 
0   
gpio: pin 54 (gpio 54) value is 
0   
gpio: pin 53 (gpio 53) value is 
1   
switch to partitions #0, 
OK 
mmc0 is current 
device  
gpio: pin 54 (gpio 54) value is 
1   
Checking for: /uEnv.txt 
... 
Checking for: /boot.scr 
... 
Checking for: /boot/boot.scr 
...
Checking for: /boot/uEnv.txt 
...
gpio: pin 55 (gpio 55) value is 
1   
2100 bytes read in 20 ms (102.5 
KiB/s)  
Loaded environment from 
/boot/uEnv.txt  
debug: [dtb=am335x-boneblack.dtb] 
...   
Using: dtb=am335x-boneblack.dtb 
... 
Checking if uname_r is set in 
/boot/uEnv.txt... 
gpio: pin 56 (gpio 56) value is 
1   
Running uname_boot 
...  

Re: [beagleboard] Abridged summary of beagleboard@googlegroups.com - 11 updates in 8 topics

[Prakash Dash]

Hi All,

I am not aware of what are the Touch Screen supported in Beagle bone black
so i need help to understand what are the supported Touch Screen Module
devices
for Beagle bone black.

I need to understand and integrate that Touch Screen Module device in
Beagle Bone Black.
Can someone please tell me which will be the Supported Touch Screen device
and cape board for same Touch Screen device
for the beagle bone black so that i will go for order one and will try to
port that device in beagle bone black.

Can someone please help me on this to know and understand the right touch
Screen board for Beagle bone Black.

Thanks
Prakash

On Wed, Jan 2, 2019 at 7:44 PM  wrote:

> beagleboard@googlegroups.com
> 
>  Google
> Groups
> 
> 
> Today's topic summary
> View all topics
> 
>
>- Please help me <#m_-248695849101781358_group_thread_0> - 1 Update
>- Trouble using config-pin to config P9.28 pin as spi or gpio
><#m_-248695849101781358_group_thread_1> - 2 Updates
>- Windows 10 Bone_D64.exe Failing
><#m_-248695849101781358_group_thread_2> - 1 Update
>- Using IIO driver as a Loadable kernel module
><#m_-248695849101781358_group_thread_3> - 2 Updates
>- cape_universal and how to start up PWM
><#m_-248695849101781358_group_thread_4> - 2 Updates
>- Error installing smbus2 on pocketbeagle
><#m_-248695849101781358_group_thread_5> - 1 Update
>- Beagle Bone Black with LCD cape shows Black Screen
><#m_-248695849101781358_group_thread_6> - 1 Update
>- Interfacing with Analog inputs using the BB Black PRU
><#m_-248695849101781358_group_thread_7> - 1 Update
>
> Please help me
> 
> ARASH FAHIM : Jan 02 12:58PM +0330
>
> HI
> I am a computer student
> I want to change analog video (PAL/NTSC) to mpeg 2 realtime and send output
> stream to another system
> Can I use BeagleBoard for this subject
>
> thank you for help me
> ...more
> 
> Back to top <#m_-248695849101781358_digest_top>
> Trouble using config-pin to config P9.28 pin as spi or gpio
> 
> scott.nort...@gmail.com: Jan 01 08:17AM -0800
>
> Hello,
>
> I too have run into the issue of not being able to set P9.28 as well using
> the latest pre-built image from
> ...more
> 
> varshneybhar...@gmail.com: Jan 01 09:48AM -0800
>
> It works! Thanks for your help!
> ...more
> 
> Back to top <#m_-248695849101781358_digest_top>
> Windows 10 Bone_D64.exe Failing
> 
> anaghak...@gmail.com: Jan 01 10:39PM -0800
>
> Worked for me as well . Thanks a lot.
>
> ...more
> 
> Back to top <#m_-248695849101781358_digest_top>
> Using IIO driver as a Loadable kernel module
> 
> Bashid : Jan 02 02:25AM -0800
>
> Hello
>
> I want use ti-ads8688 iio driver
> <
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/iio/adc/ti-ads8688.c>
> as
> a kernel module. I am using Beaglebone Black.
> ...more
> 
> Bashid : Jan 02 03:23AM -0800
>
> this is
> <
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/iio/adc/ti-ads8688.txt>
>
> the device tree recommendation of texas instrument. ...more
> 
> Back to top <#m_-248695849101781358_digest_top>
> cape_universal and how to start up PWM
> 
> Ken Shirriff : Jan 01 05:02PM -0800
>
> I'm trying to enable PWM and some GPIOs on the Beaglebone and I'm running
> into various problems.
>
> Originally I tried to start PWM using the /sys/class/pwm/pwmchip1/export
> interface, but ran into ...more
> 
> Robert Nelson : Jan 01 07:40PM -0600
>

Re: [beagleboard] Abridged summary of beagleboard@googlegroups.com - 11 updates in 8 topics

[Prakash Dash]

Hi All,

I am not aware of what Camera device supported in Beagle bone black so i
need help to understand what are the supported Camera Module devices
for Beagle bone black.

I need to understand and integrate that Camera Module device in Beagle Bone
Black.
Can someone please tell me which will be the Supported Camera device and
cape board for same Camera device
for the beagle bone black so that i will go for order one and will try to
port that device in beagle bone black.

Thanks
Prakash

On Wed, Jan 2, 2019 at 7:44 PM  wrote:

> beagleboard@googlegroups.com
> 
>  Google
> Groups
> 
> 
> Today's topic summary
> View all topics
> 
>
>- Please help me <#m_-248695849101781358_group_thread_0> - 1 Update
>- Trouble using config-pin to config P9.28 pin as spi or gpio
><#m_-248695849101781358_group_thread_1> - 2 Updates
>- Windows 10 Bone_D64.exe Failing
><#m_-248695849101781358_group_thread_2> - 1 Update
>- Using IIO driver as a Loadable kernel module
><#m_-248695849101781358_group_thread_3> - 2 Updates
>- cape_universal and how to start up PWM
><#m_-248695849101781358_group_thread_4> - 2 Updates
>- Error installing smbus2 on pocketbeagle
><#m_-248695849101781358_group_thread_5> - 1 Update
>- Beagle Bone Black with LCD cape shows Black Screen
><#m_-248695849101781358_group_thread_6> - 1 Update
>- Interfacing with Analog inputs using the BB Black PRU
><#m_-248695849101781358_group_thread_7> - 1 Update
>
> Please help me
> 
> ARASH FAHIM : Jan 02 12:58PM +0330
>
> HI
> I am a computer student
> I want to change analog video (PAL/NTSC) to mpeg 2 realtime and send output
> stream to another system
> Can I use BeagleBoard for this subject
>
> thank you for help me
> ...more
> 
> Back to top <#m_-248695849101781358_digest_top>
> Trouble using config-pin to config P9.28 pin as spi or gpio
> 
> scott.nort...@gmail.com: Jan 01 08:17AM -0800
>
> Hello,
>
> I too have run into the issue of not being able to set P9.28 as well using
> the latest pre-built image from
> ...more
> 
> varshneybhar...@gmail.com: Jan 01 09:48AM -0800
>
> It works! Thanks for your help!
> ...more
> 
> Back to top <#m_-248695849101781358_digest_top>
> Windows 10 Bone_D64.exe Failing
> 
> anaghak...@gmail.com: Jan 01 10:39PM -0800
>
> Worked for me as well . Thanks a lot.
>
> ...more
> 
> Back to top <#m_-248695849101781358_digest_top>
> Using IIO driver as a Loadable kernel module
> 
> Bashid : Jan 02 02:25AM -0800
>
> Hello
>
> I want use ti-ads8688 iio driver
> <
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/iio/adc/ti-ads8688.c>
> as
> a kernel module. I am using Beaglebone Black.
> ...more
> 
> Bashid : Jan 02 03:23AM -0800
>
> this is
> <
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/iio/adc/ti-ads8688.txt>
>
> the device tree recommendation of texas instrument. ...more
> 
> Back to top <#m_-248695849101781358_digest_top>
> cape_universal and how to start up PWM
> 
> Ken Shirriff : Jan 01 05:02PM -0800
>
> I'm trying to enable PWM and some GPIOs on the Beaglebone and I'm running
> into various problems.
>
> Originally I tried to start PWM using the /sys/class/pwm/pwmchip1/export
> interface, but ran into ...more
> 
> Robert Nelson : Jan 01 07:40PM -0600
>
>
> > Thanks,
> > Ken
>
> > P.S. By "race conditions", I mean that if I write to
> /sys/class/pwm/pwmchip1/export, and then try to write to
> 

Re: [beagleboard] Abridged summary of beagleboard@googlegroups.com - 11 updates in 8 topics

[Prakash Dash]

Hi All,

I am not aware of what AUDIO Codec device supported in Beagle bone black so
i need help to understand what are the supported devices
for Beagle bone black.

I need to understand and integrate that AUDIO Codec device in Beagle Bone
Black.
Can someone please tell me which will be the Supported AUDIO Codec device
and cape board for same AUDIO Codec device
for the beagle bone black so that i will go for order one and will try to
port that device in beagle bone black.

Thanks
Prakash

On Wed, Jan 2, 2019 at 7:44 PM  wrote:

> beagleboard@googlegroups.com
> 
>  Google
> Groups
> 
> 
> Today's topic summary
> View all topics
> 
>
>- Please help me <#m_-248695849101781358_group_thread_0> - 1 Update
>- Trouble using config-pin to config P9.28 pin as spi or gpio
><#m_-248695849101781358_group_thread_1> - 2 Updates
>- Windows 10 Bone_D64.exe Failing
><#m_-248695849101781358_group_thread_2> - 1 Update
>- Using IIO driver as a Loadable kernel module
><#m_-248695849101781358_group_thread_3> - 2 Updates
>- cape_universal and how to start up PWM
><#m_-248695849101781358_group_thread_4> - 2 Updates
>- Error installing smbus2 on pocketbeagle
><#m_-248695849101781358_group_thread_5> - 1 Update
>- Beagle Bone Black with LCD cape shows Black Screen
><#m_-248695849101781358_group_thread_6> - 1 Update
>- Interfacing with Analog inputs using the BB Black PRU
><#m_-248695849101781358_group_thread_7> - 1 Update
>
> Please help me
> 
> ARASH FAHIM : Jan 02 12:58PM +0330
>
> HI
> I am a computer student
> I want to change analog video (PAL/NTSC) to mpeg 2 realtime and send output
> stream to another system
> Can I use BeagleBoard for this subject
>
> thank you for help me
> ...more
> 
> Back to top <#m_-248695849101781358_digest_top>
> Trouble using config-pin to config P9.28 pin as spi or gpio
> 
> scott.nort...@gmail.com: Jan 01 08:17AM -0800
>
> Hello,
>
> I too have run into the issue of not being able to set P9.28 as well using
> the latest pre-built image from
> ...more
> 
> varshneybhar...@gmail.com: Jan 01 09:48AM -0800
>
> It works! Thanks for your help!
> ...more
> 
> Back to top <#m_-248695849101781358_digest_top>
> Windows 10 Bone_D64.exe Failing
> 
> anaghak...@gmail.com: Jan 01 10:39PM -0800
>
> Worked for me as well . Thanks a lot.
>
> ...more
> 
> Back to top <#m_-248695849101781358_digest_top>
> Using IIO driver as a Loadable kernel module
> 
> Bashid : Jan 02 02:25AM -0800
>
> Hello
>
> I want use ti-ads8688 iio driver
> <
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/iio/adc/ti-ads8688.c>
> as
> a kernel module. I am using Beaglebone Black.
> ...more
> 
> Bashid : Jan 02 03:23AM -0800
>
> this is
> <
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/iio/adc/ti-ads8688.txt>
>
> the device tree recommendation of texas instrument. ...more
> 
> Back to top <#m_-248695849101781358_digest_top>
> cape_universal and how to start up PWM
> 
> Ken Shirriff : Jan 01 05:02PM -0800
>
> I'm trying to enable PWM and some GPIOs on the Beaglebone and I'm running
> into various problems.
>
> Originally I tried to start PWM using the /sys/class/pwm/pwmchip1/export
> interface, but ran into ...more
> 
> Robert Nelson : Jan 01 07:40PM -0600
>
>
> > Thanks,
> > Ken
>
> > P.S. By "race conditions", I mean that if I write to
> /sys/class/pwm/pwmchip1/export, and then try to write to
> /