Go to advanced search

by telarium
Tue Jun 20, 2017 12:53 am
Forum: Device Tree
Topic: Tips for debugging overlays?
Replies: 1
Views: 2189

Tips for debugging overlays?

I've made a device tree overlay that compiles without a problem, but when I apply the overlay, it doesn't seem to add the device I want and load the associated kernel module. This leads me to a very general question: Is there some recommended way to debug why an applied overlay might not be working?...
by telarium
Thu Apr 27, 2017 7:40 pm
Forum: Device Tree
Topic: Writing i2c registers from device tree?
Replies: 2
Views: 1274

Writing i2c registers from device tree?

Does anyone know if it's possible to write registers to an i2c device from the device tree? For example, instead of doing this from the command line...

Code: Select all

i2cset -f -y 0 0x23 0x34 0x03
... I'd like this to be done in the device tree if it is at all possible. Thanks in advance!
by telarium
Wed Oct 26, 2016 5:41 pm
Forum: Graphics, sound and multimedia
Topic: Question about framebuffer color conversions
Replies: 0
Views: 470

Question about framebuffer color conversions

I'm trying to cut my teeth on developing drivers for various LCD controllers, and I have a question about framebuffers. Suppose I have a 1-bit black and white LCD screen registered at /dev/fb1. Is there a mechanism for copying /dev/fb0 into fb1 AND applying a dithering effect of some kind? Perhaps b...
by telarium
Wed Aug 19, 2015 6:19 pm
Forum: Raspberry Pi OS
Topic: VideoCore driver
Replies: 8
Views: 3314

Re: VideoCore driver

Does anyone know the status of this? Is the Broadcom implementation of OpenGL ES still going to cause framerate issues with game engines like Moai?
by telarium
Mon Jan 19, 2015 5:54 pm
Forum: General discussion
Topic: Trouble getting Xbee working with the Pi
Replies: 7
Views: 2290

Re: Trouble getting Xbee working with the Pi

The wires are about 0.25", so I don't think length is a problem. I did try wiring a 3.3v Arduino directly to the Pi through their respective RX and TX pins. Using Minicom, I do see data coming in. Just not from the Xbee.
by telarium
Mon Jan 19, 2015 4:33 am
Forum: General discussion
Topic: Trouble getting Xbee working with the Pi
Replies: 7
Views: 2290

Re: Trouble getting Xbee working with the Pi

I don't have a capacitor like that handy, but what I just tried in the meantime is using an external 3.3v power supply for the Xbee, while keeping pins 2 and 3 connected to the Pi for serial data. It's still, however, not working, which still makes me think the issue is not power related.
by telarium
Mon Jan 19, 2015 3:24 am
Forum: General discussion
Topic: Trouble getting Xbee working with the Pi
Replies: 7
Views: 2290

Re: Trouble getting Xbee working with the Pi

I don't have a photo handy, but here's the wiring guide I was following: https://lh6.googleusercontent.com/-9bmIuENd0Ac/U54jWdn2hRI/AAAAAAAAEb4/0EZ-vA6siPw/w820-h1114-no/rasp_pi_to_xbee.png But the main difference with mine is that I'm using a 3.3v regulator connected to the Pi's 5v output. And in f...
by telarium
Mon Jan 19, 2015 1:05 am
Forum: General discussion
Topic: Trouble getting Xbee working with the Pi
Replies: 7
Views: 2290

Trouble getting Xbee working with the Pi

Pulling my hair out the past few days getting the Xbee Series working with my Pi. I have pin 2 on the Xbee connected to the Pi's RX pin and pin 3 connected to TX on the Pi. Pin 1 and ground on the Xbee are then connected to a 3.3v regulator. I then edited /boot/cmdline.txt and /etc/inittab to free u...
by telarium
Thu Jan 16, 2014 11:19 pm
Forum: Graphics, sound and multimedia
Topic: Wifi CRT interference
Replies: 3
Views: 836

Re: Wifi CRT interference

It's continuous rolling lines on the CRT. Moving the wifi dongle away from the TV doesn't help. The only thing that gets ride of it is by powering them off of two separate AC adapters.
by telarium
Thu Jan 16, 2014 11:06 pm
Forum: Graphics, sound and multimedia
Topic: Wifi CRT interference
Replies: 3
Views: 836

Wifi CRT interference

I have a project where I've built a Raspberry Pi into an old CRT. The CRT has a 13v power supply, and I'm using a switching 5v regulator to power the Pi. When I first power it on, everything works great. The picture is clean and looks perfect. However, the longer it runs (after about 30 minutes or s...
by telarium
Sat Aug 10, 2013 10:19 pm
Forum: Graphics, sound and multimedia
Topic: Raspberry Pi transistors and composite video
Replies: 1
Views: 1027

Raspberry Pi transistors and composite video

Here's an interesting problem. I had an idea where I wanted the Raspberry Pi's RCA hooked up to a television to show some video. It also was going to be responsible for turning the TV monitor on and off. I hooked up a transistor to the power so that one of the Pi's GPIO pins was connected to the bas...
by telarium
Tue Jun 25, 2013 6:00 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi R2D2 with wifi control, webcam, and video out
Replies: 2
Views: 4135

Raspberry Pi R2D2 with wifi control, webcam, and video out

I decided to take a crack at my own hack of the 15" Hasbro Interactive RD2D. Mine includes a web interface so you can control him over any wifi network. Steaming video allows you to see what he sees, and a small pico projector is mounted inside him can play video files on demand. Plus a wide variety...
by telarium
Tue Jun 04, 2013 4:29 pm
Forum: Networking and servers
Topic: Question about Raspberry Pi and Wifi Repeaters
Replies: 15
Views: 2557

Re: Question about Raspberry Pi and Wifi Repeaters

Thanks, I think I have now found the sequence that seems to work for me:

Code: Select all

sudo ifdown wlan0
sudo /etc/init.d/networking restart
sudo ifup wlan0
sudo dhclient wlan0
by telarium
Mon Jun 03, 2013 4:50 pm
Forum: Networking and servers
Topic: Question about Raspberry Pi and Wifi Repeaters
Replies: 15
Views: 2557

Re: Question about Raspberry Pi and Wifi Repeaters

Here's what it shows after taking it down and bringing it back up: Selected interface 'wlan0' bssid=58:93:96:1f:98:d8 ssid=[my network name] id=2 mode=station pairwise_cipher=CCMP group_cipher=CCMP key_mgmt=WPA2-PSK wpa_state=COMPLETED address=80:1f:02:a2:fa:41 Note above, it doesn't list ip_address...
by telarium
Sun Jun 02, 2013 1:13 am
Forum: Networking and servers
Topic: Question about Raspberry Pi and Wifi Repeaters
Replies: 15
Views: 2557

Re: Question about Raspberry Pi and Wifi Repeaters

Same result. I can take the connection down, but bringing it back up doesn't result in any output or a connection to a Wifi network.
by telarium
Fri May 31, 2013 5:05 pm
Forum: Networking and servers
Topic: Question about Raspberry Pi and Wifi Repeaters
Replies: 15
Views: 2557

Re: Question about Raspberry Pi and Wifi Repeaters

Okay, it appears that "ifconfig wlan0 down" does take the wifi connection down, but "ifconfig wlan0 up" doesn't bring it back. It doesn't error, either. It executes and seems to do nothing. I tried writing to the log file, but it didn't write anything because I'm guessing there was no output. I did ...
by telarium
Thu May 30, 2013 4:58 pm
Forum: Networking and servers
Topic: Question about Raspberry Pi and Wifi Repeaters
Replies: 15
Views: 2557

Re: Question about Raspberry Pi and Wifi Repeaters

Sure. I forget how to do that exactly, though. Can someone refresh my memory?
by telarium
Wed May 29, 2013 3:28 pm
Forum: Networking and servers
Topic: Question about Raspberry Pi and Wifi Repeaters
Replies: 15
Views: 2557

Re: Question about Raspberry Pi and Wifi Repeaters

It's run by a Python script. I.e., os.system('sudo ifconfig wlan0 up')
by telarium
Wed May 29, 2013 3:06 pm
Forum: Networking and servers
Topic: Question about Raspberry Pi and Wifi Repeaters
Replies: 15
Views: 2557

Re: Question about Raspberry Pi and Wifi Repeaters

I did try that method first, although it didn't seem to work either. I may try it again and see if I missed something.
by telarium
Tue May 28, 2013 5:52 pm
Forum: Networking and servers
Topic: Question about Raspberry Pi and Wifi Repeaters
Replies: 15
Views: 2557

Question about Raspberry Pi and Wifi Repeaters

I'm developing a Wifi Raspberry Pi project for use around a large space in our office. I've noticed that if I carry the Pi around with me, it will lose its connection to the network when I walk around the floor. I'm assuming this is because I am transitioning between two Wifi repeaters. Both repeate...
by telarium
Fri May 24, 2013 5:05 pm
Forum: Beginners
Topic: Automatic login no longer working?
Replies: 10
Views: 8439

Re: Automatic login no longer working?

Okay, I see my confusion. The line I needed to comment out was "1:2345:respawn:/sbin/getty --noclear 38400 tty1" I guess I was following the instructions too literally, where it listed the line as "1:2345:respawn:/sbin/getty 115200 tty1". I'm assuming this must have changed with the more recent Rasp...
by telarium
Fri May 24, 2013 4:27 pm
Forum: Beginners
Topic: Automatic login no longer working?
Replies: 10
Views: 8439

Re: Automatic login no longer working?

I think there's some confusion here. Again, if you look at the full code I posted, this line appears once and only once. The line that I was supposed to comment out is indeed commented out. There are no extra commands like you're suggesting. Here's the full code again: # /etc/inittab: init(8) config...
by telarium
Fri May 24, 2013 5:25 am
Forum: Beginners
Topic: Automatic login no longer working?
Replies: 10
Views: 8439

Re: Automatic login no longer working?

If you look at the full code I posted, isn't this the case? I commented out the original line and added the new one.
by telarium
Fri May 24, 2013 2:14 am
Forum: Beginners
Topic: Automatic login no longer working?
Replies: 10
Views: 8439

Re: Automatic login no longer working?

What method should be used?
by telarium
Fri May 24, 2013 12:47 am
Forum: Beginners
Topic: Automatic login no longer working?
Replies: 10
Views: 8439

Re: Automatic login no longer working?

By the way, this is what the bottom of my inittab file looks like: # /etc/inittab: init(8) configuration. # $Id: inittab,v 1.91 2002/01/25 13:35:21 miquels Exp $ # The default runlevel. id:2:initdefault: # Boot-time system configuration/initialization script. # This is run first except when booting ...

Go to advanced search