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by BruceJohnJennerLawso
Thu Nov 05, 2020 9:07 pm
Forum: Troubleshooting
Topic: Calibre on Pi4 Crashes while loading
Replies: 5
Views: 578

Re: Calibre on Pi4 Crashes while loading

I have the same issue on Buster, even after hard reinstalling the package. I think its broken
by BruceJohnJennerLawso
Tue Oct 06, 2020 2:27 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Is it possible to drive 18 separate SPI devices?
Replies: 10
Views: 421

Re: Is it possible to drive 18 separate SPI devices?

Per your comment about I2C limits, will 18 individual ATMegas interfaced to the Pi by I2C be workable? You've still not said how much distance there will be between the readers and the central Pi. Maybe a foot max? The layout will look like 2 3x3 grids of readers side by side, worst case scenario i...
by BruceJohnJennerLawso
Mon Oct 05, 2020 5:02 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Is it possible to drive 18 separate SPI devices?
Replies: 10
Views: 421

Re: Is it possible to drive 18 separate SPI devices?

You need a tristate buffer for each reader according to https://www.raspberrypi.org/forums/viewtopic.php?f=44&t=195628&p=1670038#p1670038 as the MRC522 chip apparently always drives the MISO line even when not selected. that ATMega idea is sounding better all the time then Per your comment ...
by BruceJohnJennerLawso
Mon Oct 05, 2020 4:04 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Is it possible to drive 18 separate SPI devices?
Replies: 10
Views: 421

Re: Is it possible to drive 18 separate SPI devices?

You can certainly connect as many devices to the SPI bus as long as you can find spare GPIO to act as slave selects. Your problem will be in integrating that support into the software you use to read the RFID reader. Unless you are a decent programmer it will probably be safer to use the Arduino ap...
by BruceJohnJennerLawso
Mon Oct 05, 2020 3:57 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Is it possible to drive 18 separate SPI devices?
Replies: 10
Views: 421

Re: Is it possible to drive 18 separate SPI devices?

another option that might be simpler, is to put an arduino on each RFID reader (possibly a pair of readers) and then configure the arduino to act as an i2c slave, and wire them all up to the pi i2c is a shared bus with addressing, so you can more easily add ~128 devices to the same 2 pins That woul...
by BruceJohnJennerLawso
Thu Oct 01, 2020 4:28 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Is it possible to drive 18 separate SPI devices?
Replies: 10
Views: 421

Is it possible to drive 18 separate SPI devices?

Reading from this answer it appears to be a reality https://raspberrypi.stackexchange.com/questions/31932/add-more-than-2-spi-slaves So all of the devices will share serial lines MOSI/MISO/SCLK, but Ill use gpio pins for the additional CS lines? Is the programming for this interface possible through...
by BruceJohnJennerLawso
Thu Mar 01, 2018 2:35 pm
Forum: HATs and other add-ons
Topic: Anyone familiar with the Waveshare GSM/Bluetooth Hat?
Replies: 30
Views: 28501

Anyone familiar with the Waveshare GSM/Bluetooth Hat?

I was looking for a solution to connecting a bluetooth headset to the pi, and having GPS/GSM access along with a RTC onboard sounded pretty good, so I ordered a waveshare GSM/GPS/Bluetooth/whatever hat . The shipping was reasonably quick even for ePacket from China (under a month IIRC?), and the bui...
by BruceJohnJennerLawso
Fri Jan 26, 2018 2:59 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: How to identify if a ribbon cable interface is DSI?
Replies: 1
Views: 973

How to identify if a ribbon cable interface is DSI?

So I ordered what I thought was an HDMI projector online, only to discover that I accidentally ordered the UC-28B version of the projector that doesnt have HDMI input, just a slot for usb memory sticks and sd cards. Taking a look at this dissasembly video on youtube , I see that the device seems to ...
by BruceJohnJennerLawso
Sun Jan 07, 2018 6:29 am
Forum: Other projects
Topic: Trying to figure out if feeding HDMI in is possible
Replies: 3
Views: 2843

Trying to figure out if feeding HDMI in is possible

So Ive been mulling over an idea for a raspberry pi powered VR headset. I bought one of those plastic VR headsets that you can slot your phone into and look at a nice little scene like underwater sharks for a few minutes, but the applications available were minimal at best. I happened to notice that...
by BruceJohnJennerLawso
Sun Apr 17, 2016 9:20 pm
Forum: General discussion
Topic: New Open GL Driver, Bug report thread
Replies: 98
Views: 58687

Re: New Open GL Driver, Bug report thread

A question regarding the new Driver, is there any way to get it working with a custom kernel (specifically the one from adafruit)? I find that glxgears reverts to its previous flickering behaviour after I install the adafruit raspberrypi-bootloader for a project Im working on. curl -SLs https://apt....
by BruceJohnJennerLawso
Sun Apr 17, 2016 9:13 pm
Forum: General discussion
Topic: New Open GL Driver, Bug report thread
Replies: 98
Views: 58687

Re: New Open GL Driver, Bug report thread

Device: Raspberry Pi 2 OS: Jessie via BerryBoot, fully updated Monitor: 1366 x 768 Problem: rainbow screen (like during boot) from start towards finish loading the desktop, but goes away if I move the mouse, and comes back after no mouse movement. Problem goes away if - I disable the AA GL driver a...
by BruceJohnJennerLawso
Fri Jul 10, 2015 12:51 pm
Forum: Troubleshooting
Topic: Panic at the Kernel
Replies: 4
Views: 1481

Re: Panic at the Kernel

The sdcard was brand new, so I think it should be ok. The power supply was running from a wall charger into a battery pack, which was then connected to the pi. (stays up through a power failure). The screen was intermittently flickering in and out with a usb device attached, which made me think that...
by BruceJohnJennerLawso
Thu Jul 09, 2015 11:33 pm
Forum: Troubleshooting
Topic: Panic at the Kernel
Replies: 4
Views: 1481

Panic at the Kernel

So I get home today, and try to ssh into my Pi. The device is up on the network at its usual ip, but when I try to connect it fails. Finally I plug in the monitor to the HDMI port, and get a screen that says kernel panic. Uh-oh... http://i.imgur.com/0r1u808.jpg The Pi itself is a A+ running the late...
by BruceJohnJennerLawso
Sat May 23, 2015 12:37 am
Forum: Beginners
Topic: Hello and a question about display output
Replies: 2
Views: 609

Hello and a question about display output

First off, hello to everyone, I just got started with raspberry pi last night, getting raspbian set up via noobs on a tv screen. Ive used linux as my desktop for about a year now, so Im pretty familiar with the ins and outs of managing a linux system at this point. I had a question/idea regarding di...

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