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by rotwang
Tue Apr 09, 2019 11:11 am
Forum: Troubleshooting
Topic: VLC & Commercial DVD's
Replies: 5
Views: 374

Re: VLA & Commercial DVD's

I take it you haven't installed dvdcss yet.
Google for it, install it and most of your DVD problems (caused by the CSS encryption anyway)will go away.
Roger
by rotwang
Tue Apr 02, 2019 10:30 am
Forum: General discussion
Topic: Pi 4 questions
Replies: 166
Views: 9098

Re: Pi 4 questions

The main thing I'd like to see in a Pi4 or any of it's successors is a constant rate clock to the baud rate divider for any and all uarts. It's not much to ask.

Roger
by rotwang
Tue Apr 02, 2019 10:21 am
Forum: Compute Module
Topic: Raspi-gpio doesn't work as per documentation
Replies: 3
Views: 413

Raspi-gpio doesn't work as per documentation

sudo raspi-gpio funcs >gpio-funcs.csv merely produces an empty file. giving a gpio pin number gives a 2-line file, line 1 is the csv headers, line 2 is the values. however, giving a range of gpio pin numbers, as 0-45, gives a file containing pairs of lines for each gpio, the first is the csv header...
by rotwang
Fri Nov 30, 2018 2:04 pm
Forum: Off topic discussion
Topic: Putting the RPi in the perspective, looking Retro.
Replies: 38
Views: 3995

Re: Putting the RPi in the perspective, looking Retro.

Also remember that while using QL Basic you lost the task management/multi-tasking capability, due to some decisions made in the design of QL Basic, that the block buffering was part of the micro-drive driver, so that you had to duplicate all that code to add any other mass storage device.
ROger
by rotwang
Tue Nov 06, 2018 10:32 am
Forum: General discussion
Topic: Audio from HDMI cable
Replies: 3
Views: 264

Re: Audio from HDMI cable

HDMI audio doesn't work like that. The audio is a digital stream and needs to be decoded externally to give analog outputs.
Various posts have been made about adding analog audio out to Zero's
by rotwang
Tue Oct 23, 2018 9:46 am
Forum: General discussion
Topic: Oh damn, it's happened! Charging a lot of pis?
Replies: 10
Views: 1008

Re: Oh damn, it's happened! Charging a lot of pis?

You might consider looking for 5v switchmode PSU's. These should be available with ratings up to 50amps and beyond.
Roger
by rotwang
Tue May 22, 2018 10:43 am
Forum: Advanced users
Topic: Converting docx to pdf, with python script
Replies: 9
Views: 5296

Re: Converting docx to pdf, with python script

I have used the following code it return's error. I have libreoffice 6.0 installed in my fedora 24 os profileId="somename" def conversiontopdf(name): print("starting conversion to pdf") output = subprocess.check_output(['libreoffice', '--convert-to', 'pdf' ,name]) print output conversiontopdf(profi...
by rotwang
Tue May 22, 2018 10:18 am
Forum: General discussion
Topic: Multiple framebuffer support - testers wanted
Replies: 10
Views: 1688

Re: Multiple framebuffer support - testers wanted

No-one? All my efforts in vain then..... Your efforts will, eventually, be greatly appreciated, you may need to be a little patient. If only I could have a cross-compiler setup that worked on my desktop machine (8 cores, 64bit, great gobs of memory and disc) I'd be delighted. If anybody comes up wi...
by rotwang
Wed Apr 25, 2018 10:08 am
Forum: Advanced users
Topic: Recover from corrupted heap
Replies: 4
Views: 630

Re: Recover from corrupted heap

If the H264 files were transfered in ASCII mode then they are almost certainly trashed, and your problem is nothing to do with the GPU. Try re-doing the transfer in BINARY mode to get a clean H264 file and try again. If that works then the original files are toast, delete them. Roger Bump. Any ideas...
by rotwang
Wed Apr 25, 2018 9:53 am
Forum: General discussion
Topic: Cat 5 for 5V and Ground
Replies: 6
Views: 491

Re: Cat 5 for 5V and Ground

Cat5 should be perfectly fine, LEDs won't be bothered by any small voltage drop, not that there would be much over 1metre. Just make sure that you use the flexible cable normally used for jumpers, and don't use anything marked CCA (copper clad aluminium). Soldering the cores should be no problem as ...
by rotwang
Wed Apr 25, 2018 9:45 am
Forum: Beginners
Topic: Send data in unit8 format via serial port [solved]
Replies: 4
Views: 351

Re: Send data in unit8 format via serial port

I'm going to guess at a typing error, and that you actually meant uint8 . The %d format code would produce the conventional ascii character form of the value of data. It may be that using format code %c is what you want, that would output the bottom 8 bits of data as a single character (0 - 255). Do...
by rotwang
Tue Apr 10, 2018 10:12 am
Forum: Troubleshooting
Topic: hdmi to sdi converter with raspberry pi, no output problem
Replies: 17
Views: 1237

Re: hdmi to sdi converter with raspberry pi, no output problem

Hello everyone, I am working on raspberry pi with a tv using hdmi to sdi converter. i have changed the config.txt file hdmi_force_mode=1 hdmi_force_hotplug=1 hdmi_group=1 hdmi_mode=1 hdmi_drive=2 sdtv_mode=2 but i am not getting any output in sdi i have also tried different config settings and stil...
by rotwang
Tue Apr 03, 2018 10:20 am
Forum: Troubleshooting
Topic: Zero W as HID device draws too much power
Replies: 11
Views: 1000

Re: Zero W as HID device draws too much power

Rule 1 for Pi Zero's -- Either power it from the USB Data port OR from the power port NEVER BOTH. Read the specs for the zero, the 5v GPIO pins, the 5V USB data pin and the 5v USB power pin are all connected directly together. I suggest you devote your energies to finding out what Apple's idea of US...
by rotwang
Mon Mar 26, 2018 11:03 am
Forum: General discussion
Topic: New PoE Hat
Replies: 32
Views: 7109

Re: New PoE Hat

Why on earth should a PoE card's eeprom be at a HAT I2C address? What I am suggesting is NOT a HAT since it would not connect via the 40-way header, thus only needing an extended connector plugged onto the 40-way to accommodate a HAT. Using the ID_SC/ID_SD bus gives the needed control over choice of...
by rotwang
Thu Mar 22, 2018 1:19 pm
Forum: General discussion
Topic: New PoE Hat
Replies: 32
Views: 7109

Re: New PoE Hat

Nobody ever needed glasses for defective hindsight, but here goes -- In some future incarnation (maybe pi4) would you consider using an 8-pin header for the PoE board, assigned as :- 4 pins -- centre taps of magjack coils 2 pins -- +5v and Gnd to pi 2 pins -- SDA and SCL for eeprom and fan control w...
by rotwang
Tue Mar 06, 2018 11:55 am
Forum: Advanced users
Topic: How to read Amperage from a 230V AC line - not with a clamp
Replies: 16
Views: 2204

Re: How to read Amperage from a 230V AC line - not with a clamp

Cheap, small, safe -- pick any two.
by rotwang
Fri Dec 15, 2017 5:04 pm
Forum: Raspberry Pi Desktop for PC and Mac
Topic: Has anyone sucessfully installed on an ASUS eeepc?
Replies: 14
Views: 4743

Re: Has anyone sucessfully installed on an ASUS eeepc?

Progress of a sort. The eeePC I have has no model number visible, but seems to be a 701 with a 4Gig solid state drive (see 2 below) 1) yes. dd'ing the iso to a usb stick does produce something bootable. This will boot and run persistence on the eeePC. 2) The Debian installer is most unhelpful when i...
by rotwang
Fri Dec 15, 2017 1:24 pm
Forum: Raspberry Pi Desktop for PC and Mac
Topic: Has anyone sucessfully installed on an ASUS eeepc?
Replies: 14
Views: 4743

Re: Has anyone sucessfully installed on an ASUS eeepc?

Before this turns into a flame-war, will everyone please read the question, and if you can't answer it then DON'T. I thought I had made it abundantly clear which distribution and which machine I am interested in so for the last time Have you successfully installed the stretch Raspbian Desktop (2017-...
by rotwang
Thu Dec 14, 2017 6:11 pm
Forum: Raspberry Pi Desktop for PC and Mac
Topic: Has anyone sucessfully installed on an ASUS eeepc?
Replies: 14
Views: 4743

Re: Has anyone sucessfully installed on an ASUS eeepc?

Now we've got all that out of the way, would anyone like to answer my question. Just to make it clear, I am solely interested in installing the stretch Raspberry Pi Desktop on an ASUS EEEPC. I KNOW where to find the instructions for putting the previous jessie version onto a USB stick but this versi...
by rotwang
Wed Dec 13, 2017 3:17 pm
Forum: Raspberry Pi Desktop for PC and Mac
Topic: Has anyone sucessfully installed on an ASUS eeepc?
Replies: 14
Views: 4743

Has anyone sucessfully installed on an ASUS eeepc?

Before I leap into what could be a world of hurt, Is the ISO suitable to dd onto a usb stick, if not does anyone have an IMG version? Given that the original ASUS linux installation is a total and complete blivet*, I'm hoping to replace it by something useable and maintained. Roger *blivet -- define...
by rotwang
Fri Dec 01, 2017 12:56 pm
Forum: Raspbian
Topic: Trying to delete Raspbian. Don't know how.
Replies: 4
Views: 563

Re: Trying to delete Raspbian. Don't know how.

jamesh wrote:
Fri Dec 01, 2017 10:44 am
Format the SD card using the application from here?

https://www.sdcard.org/downloads/formatter_4/
And if you don't run a Windows or Mac machine ?
by rotwang
Tue Aug 22, 2017 9:40 am
Forum: General discussion
Topic: Replacing the Pi3 ethernet port?
Replies: 21
Views: 3490

Re: Replacing the Pi3 ethernet port?

My first thought is - do you REALLY NEED to remove the Magjack, you don't gain anything in height.
Otherwise you are about to gain an advanced skillset in PCB rework and component sourcing.
Good luck anyway
by rotwang
Mon Aug 21, 2017 9:34 am
Forum: Advanced users
Topic: Computing the Hash value of the entirety of the Pi's storage space
Replies: 13
Views: 1964

Re: Computing the Hash value of the entire of Pi memory

Pointless. If programs are executing then the memory contents are changing all the time. Even the hashing algorithm will change its memory content as variables change, quite apart from anything the kernel is doing in buffering SD card reads and writes.
by rotwang
Fri Aug 11, 2017 12:27 pm
Forum: Advanced users
Topic: Optical level sensor
Replies: 1
Views: 604

Re: Optical level sensor

I'm assuming you have a vertical transparent tube as you sightglass, in which case you may not need the cork, which in any case will tend to stick to the side of the tube due to surface tension effects. So try the following experiment - Half fill a vertical tube with water and now place a strip of p...

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