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by doublehp
Sun May 20, 2018 7:08 pm
Forum: Advanced users
Topic: Pi Zero as a USB keyboard (HID gadget)
Replies: 33
Views: 17353

Re: Pi Zero as a USB keyboard (HID gadget)

RDPUser I am doing using very complex setup involving ... netcat, screen, tcpdump and other very funky tools; my project is not stable yet, and I did not yet publish my tutorial. In short, it's PITA, but it can be done. My setup is really a huge hell. My client is a mobile phone, which connects to a...
by doublehp
Sun May 20, 2018 6:57 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: KeDei 3.5 inch 480x320 TFT lcd from ali
Replies: 232
Views: 157841

Re: KeDei 3.5 inch 480x320 TFT lcd from ali

creativityforever I have reinstalled a Kedei v6.2 last week using rpi_35_v6_1_2_3_jessie_kernel_4_4_50.rar from http://osoyoo.com/driver/ but this should also work: http://kedei.net/raspberry/v6_1/rpi_35_v6_3_stretch_kernel_4_15_18.rar from http://kedei.net/raspberry/raspberry.html No need to downl...
by doublehp
Sun May 20, 2018 5:32 pm
Forum: Troubleshooting
Topic: broken filesystem, e2fsck can not fix things
Replies: 31
Views: 3567

Re: broken filesystem, e2fsck can not fix things

No. I won't connect to that pi now to provide logs; I will explain from human memory. I was unable to find key folders in /sys; could not find any classic directory that usually describe the CPU frequency scaling (based on other pis using non KeDei ROMs). My only way to have an estimation of the CPU...
by doublehp
Thu May 17, 2018 5:21 pm
Forum: Troubleshooting
Topic: broken filesystem, e2fsck can not fix things
Replies: 31
Views: 3567

Re: broken filesystem, e2fsck can not fix things

Downclocking may produce more stable system; but, *ALL* my Pis are using the SPI, either for LCD, or 1W ... and for most SPI applications, time is critical, and most codes are finely tuned to CPU freq; so, properly coded softwares may accept small downscaling; but severe downscaling will trigger SPI...
by doublehp
Thu May 17, 2018 2:12 pm
Forum: Troubleshooting
Topic: broken filesystem, e2fsck can not fix things
Replies: 31
Views: 3567

Re: broken filesystem, e2fsck can not fix things

Please define crash. This thread is not about system hang or kernel panic or system freeze. This topic is about the storage getting corrupted and unbootable ( / getmessed up, and fsck is unable to fix it ; have to reburn the SD). I striked my first phrase because after triple check, I had been using...
by doublehp
Thu May 17, 2018 1:43 pm
Forum: Troubleshooting
Topic: module i2c missing
Replies: 7
Views: 1480

Re: module i2c missing

On a rPi v1, I also using pigpio to emulate I2C on the misc IO pins

http://abyz.me.uk/rpi/pigpio/

https://en.wikipedia.org/wiki/Raspberry_Pi
P5(6), GPIO 28 to 31.
by doublehp
Thu May 17, 2018 10:42 am
Forum: Troubleshooting
Topic: broken filesystem, e2fsck can not fix things
Replies: 31
Views: 3567

Re: broken filesystem, e2fsck can not fix things

The internal serial port is not able to work with my application. So, AMA0 can not be used. The same pi had two corruption in 6 weeks time, using the FTDI. So FTDI is not a fix for me. And internal serial port is not a solution. I am pretty sure that one pi worked with the internal port, but, maybe...
by doublehp
Sat Mar 31, 2018 7:42 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: KeDei 3.5 inch 480x320 TFT lcd from ali
Replies: 232
Views: 157841

Re: KeDei 3.5 inch 480x320 TFT lcd from ali

Start by being specific: screen version (there are over 12 Kedei versions matching 480x320 SPI TFT LCD). Then, about your rpi model and distribution. Then you want to have a look at https://github.com/torvalds/linux/tree/master/drivers/staging/fbtft https://github.com/notro/fbtft/wiki https://github...
by doublehp
Sun Mar 04, 2018 6:55 pm
Forum: Troubleshooting
Topic: broken filesystem, e2fsck can not fix things
Replies: 31
Views: 3567

Re: broken filesystem, e2fsck can not fix things

I am not going to send logrotates over email, but use a network sysloger (all local syslog can send output to a network server; it's the best way to track hard disk and NFS issues; on most hardware problems, the network card is usually the last working component; usually much longer than the video c...
by doublehp
Sat Mar 03, 2018 10:44 pm
Forum: Troubleshooting
Topic: broken filesystem, e2fsck can not fix things
Replies: 31
Views: 3567

Re: broken filesystem, e2fsck can not fix things

Filesystem crashed again with an FT232 (FTDI).
by doublehp
Wed Feb 14, 2018 3:53 pm
Forum: General discussion
Topic: Only 99% reliability with ws281* : sometimes it produces mess
Replies: 47
Views: 4194

Re: Only 99% reliability with ws281* : sometimes it produces mess

danjperron modern distributions are faster to boot than old ones; not because of CPU power, but they have redesigned the init procedure. An rpi2 with a recent raspbian is much faster than 60s. Maybe 30 or 20s, if you put your service in rc.local. You may also gain more time at power cycle by playing...
by doublehp
Sun Feb 11, 2018 6:28 pm
Forum: General discussion
Topic: Only 99% reliability with ws281* : sometimes it produces mess
Replies: 47
Views: 4194

Re: Only 99% reliability with ws281* : sometimes it produces mess

I may have found a clue about ORangePi; I am not sure yet if it will have impact, but I have good suspiscions. OrangePi0+Armbian include cpufreq; and by default, iddle system run at 240MHz; when heavu tasks start, freq grows up to 1.2GHz. I suspect this speed change to affect the topic of this threa...
by doublehp
Sun Feb 04, 2018 1:38 pm
Forum: Troubleshooting
Topic: broken filesystem, e2fsck can not fix things
Replies: 31
Views: 3567

Re: broken filesystem, e2fsck can not fix things

An other system have broken: while the system was live, I have found this in syslog (or messages, I never know): 2018-01-24T12:52:27.998410+01:00 rpi-08-locataire-42-etage-droit kernel: [86481.017530] EXT4-fs (mmcblk0p2): error count since last fsck: 4 2018-01-24T12:52:27.998469+01:00 rpi-08-locatai...
by doublehp
Fri Jan 26, 2018 10:25 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Ethernet module W5100 how to use?
Replies: 3
Views: 815

Re: Ethernet module W5100 how to use?

aBUGSworstnightmare wrote:
Fri Jan 26, 2018 10:21 am
for Pi0 it should be simpler to use a USB-to-Ethernet
The eternal stupid answer ...

... why do you think I am using a pi0 ?

BECAUSE IT HAS USB OTG PLUG FOR GADGET USE !!!
by doublehp
Thu Jan 25, 2018 8:19 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Ethernet module W5100 how to use?
Replies: 3
Views: 815

Re: Ethernet module W5100 how to use?

Same issue; after 3h of Googling, I gaveup.

https://fr.aliexpress.com/item/ENC28J60 ... 0.0.aYnpth
works just fine on rPi0.
by doublehp
Mon Jan 15, 2018 5:49 pm
Forum: Graphics, sound and multimedia
Topic: HDMI to CSI-2 via TC358743 on kernel 4.1
Replies: 415
Views: 102827

Re: HDMI to CSI-2 via TC358743 on kernel 4.1

To test HDMI, I use an HDMI2AV converter, then, an AV-USB decoder; they produce a crappy image, but they are very cheap: https://fr.aliexpress.com/item/DZLST-Mini-HD-Video-Converter-Box-HDMI-to-RCA-AV-CVSB-L-R-Video-1080P-HDMI2AV/32815095086.html?spm=a2g0s.9042311.0.0.vsKuhX https://fr.aliexpress.co...
by doublehp
Wed Jan 10, 2018 3:06 pm
Forum: General discussion
Topic: Only 99% reliability with ws281* : sometimes it produces mess
Replies: 47
Views: 4194

Re: Only 99% reliability with ws281* : sometimes it produces mess

There are many bugs in the forum API. I have fixed the links.
by doublehp
Wed Jan 10, 2018 11:09 am
Forum: General discussion
Topic: Only 99% reliability with ws281* : sometimes it produces mess
Replies: 47
Views: 4194

Re: Only 99% reliability with ws281* : sometimes it produces mess

Oh, I had not paste/crosslink it here :

Getting OrangePi Zero work with WS2811
http://www.orangepi.org/orangepibbsen// ... 318&extra=
by doublehp
Wed Jan 10, 2018 9:33 am
Forum: General discussion
Topic: Only 99% reliability with ws281* : sometimes it produces mess
Replies: 47
Views: 4194

Re: Only 99% reliability with ws281* : sometimes it produces mess

How about https://playground.arduino.cc/uploads/Main/i2c-level-shift-mosfet.png That circuit is known to not work with WS2811. I did not fully understand why, but the result is that this circuit does not respect timings, and kills high frequencies signal. Solutions have been given in the Orange lin...
by doublehp
Sun Dec 31, 2017 3:05 pm
Forum: General discussion
Topic: Only 99% reliability with ws281* : sometimes it produces mess
Replies: 47
Views: 4194

Re: Only 99% reliability with ws281* : sometimes it produces mess

What is your scheduler frequency ? zcat /proc/config.gz | grep -i CONFIG_HZ Even if you dedicate a core to a task, GPIO_SET probably calls the BCM2835 kernel driver is probably called at some point; and this will always remains subject to kernel scheduling issues. Much less than any other cases. But...
by doublehp
Sat Dec 30, 2017 6:26 pm
Forum: General discussion
Topic: Only 99% reliability with ws281* : sometimes it produces mess
Replies: 47
Views: 4194

Re: Only 99% reliability with ws281* : sometimes it produces mess

Are you up for a simple test of dynamic CPU isolation? Should only take half an hour. Honest. I have spent one hour it, and it failed. rt-tools failed on make: [ 50%] Building C object bitcalc/test/CMakeFiles/test_bitcalc.dir/__/src/bitcalc.c.o cc1: error: unrecognized command line option â-fsaniti...
by doublehp
Thu Dec 28, 2017 12:12 pm
Forum: General discussion
Topic: Only 99% reliability with ws281* : sometimes it produces mess
Replies: 47
Views: 4194

Re: Only 99% reliability with ws281* : sometimes it produces mess

Heater I have read various tutos about the CPU topic; there are at least 4 variables involved; in my use case, this one works, and does the job. maxcpus will keep some cores reserved, but without saying which ones; isolcpus is specific and states directly the one you want to keep. There are various ...
by doublehp
Wed Dec 27, 2017 11:04 pm
Forum: General discussion
Topic: Only 99% reliability with ws281* : sometimes it produces mess
Replies: 47
Views: 4194

Re: Only 99% reliability with ws281* : sometimes it produces mess

I did not say adding a transistor can't help. I said that adding the voltage converter I have make things worst, and that the issue can be solved by stopping X, and made worst by running fork bombs. Fact is, I am used to work with many chips; and honestly, a chip that does not take 1.8V as a logical...
by doublehp
Tue Dec 26, 2017 9:12 pm
Forum: General discussion
Topic: Only 99% reliability with ws281* : sometimes it produces mess
Replies: 47
Views: 4194

Re: Only 99% reliability with ws281* : sometimes it produces mess

Heater Of course the kernel is messing around; I said I am using an rPi2, so, it's a quad core CPU. Nice could help, but, if I apply it to my bash script, what will happen to child process ? my generic code is in bash; but the LED API is in python; so my bash script is calling python each time I nee...
by doublehp
Tue Dec 26, 2017 9:03 pm
Forum: General discussion
Topic: Only 99% reliability with ws281* : sometimes it produces mess
Replies: 47
Views: 4194

Re: Only 99% reliability with ws281* : sometimes it produces mess

After reboot (and removing some daemons to free more CPU time), bug occurs much less. My question was: many forums mention that WS2811 hardly work on rPi; my error rate is now between 1:400 and 1:1000. Are there better libraries than the ones I have mentionned, or do other references provide better ...

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