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by jdubin
Sun Mar 17, 2013 5:35 pm
Forum: Troubleshooting
Topic: USB/serial converters (not very) broken on Pi
Replies: 162
Views: 112814

Re: USB/serial converters (not very) broken on Pi

Prior to an rpi-update, did the device ever give an I/O error without locking up? The logs would show a USB disconnect, followed immediately by it finding it again. It might do this three or four times before the pi would lock up. See below for an example (from a log made before the updated kernel)...
by jdubin
Fri Mar 15, 2013 4:42 pm
Forum: Troubleshooting
Topic: USB/serial converters (not very) broken on Pi
Replies: 162
Views: 112814

Re: USB/serial converters (not very) broken on Pi

Running stty -F /dev/ttyUSB0 gives me the following: [email protected]:~# stty -F /dev/ttyUSB0 speed 38400 baud; line = 0; eof = ^A; -brkint -icrnl -imaxbel -isig -echo [email protected]:~# stty -F /dev/ttyUSB0 stty: /dev/ttyUSB0: Input/output error Out of, say, 35 times running stty like that, about 20 o...
by jdubin
Fri Mar 15, 2013 2:36 pm
Forum: Troubleshooting
Topic: USB/serial converters (not very) broken on Pi
Replies: 162
Views: 112814

Re: USB/serial converters (not very) broken on Pi

Yep, the firmware was something I struggled with at first, but I eventually found mts_mt9234zba.fw was needed and placed it in /lib/firmware. The modem does communicate okay at first (e.g. AT commands via minicom are successful); it's only when stty tries to do its thing that it locks up. My power s...
by jdubin
Fri Mar 15, 2013 2:18 am
Forum: Troubleshooting
Topic: USB/serial converters (not very) broken on Pi
Replies: 162
Views: 112814

Re: USB/serial converters (not very) broken on Pi

I have a Multi-Tech MTA9234ZBA-USB which I'm trying to use with Hylafax, but the modem resets (and eventually the raspi locks up) whenever faxaddmodem (a script which calls stty) probes for the speed to communicate with the device. It's very similar to what you're describing with the FTDI devices, b...
by jdubin
Wed Feb 27, 2013 2:13 am
Forum: Troubleshooting
Topic: Trouble with USB "hardware" modem
Replies: 2
Views: 1169

Re: Trouble with USB "hardware" modem

GRRRRRRR!!!!! Never underestimate the ability of a crappy cable to really mess things up!!! It turns out it was all due to the USB cable used between the Raspi and the power supply! Mind you that the power supply is a champ (HP Touchpad 5.[email protected])... but apparently the cheap USB cable I used is not. I...
by jdubin
Tue Feb 26, 2013 11:41 pm
Forum: Troubleshooting
Topic: Trouble with USB "hardware" modem
Replies: 2
Views: 1169

Trouble with USB "hardware" modem

Hi folks, I'm using a 256MB model B running 2013-02-09-wheezy-raspbian. I've done apt-get update, apt-get upgrade, and rpi-update. I'm using a Rosewill RNX-56USB modem, which IDs itself as follows: [ 96.022672] usb 1-1.3: new full-speed USB device number 5 using dwc_otg [ 96.102683] usb 1-1.3: devic...
by jdubin
Tue Aug 28, 2012 5:01 pm
Forum: Graphics, sound and multimedia
Topic: PasPi as a hardware VST host?
Replies: 21
Views: 36547

Re: PasPi as a hardware VST host?

Take a look at http://www.monoprice.com/products/produ ... 1&format=4 - at ~$30, this might be a relatively inexpensive way to get audio out of the Pi w/o having to use USB audio.
by jdubin
Fri Aug 24, 2012 4:35 pm
Forum: Graphics, sound and multimedia
Topic: MPEG-2/VC-1 Hardware Support
Replies: 1
Views: 1273

MPEG-2/VC-1 Hardware Support

Looks like you can now unlock the Raspi's hardware decode support for MPEG-2 and VC-1, for a price. Check out the Raspi Store , where you can purchase the license keys: $3.80 for MPEG-2, $1.90 for VC-1. While I'll provide the requisite "down with software patents!", I appreciate having the option to...
by jdubin
Sat Jul 07, 2012 2:58 pm
Forum: Graphics, sound and multimedia
Topic: Raspi and RTL-SDR
Replies: 3
Views: 4506

Re: Raspi and RTL-SDR

By the Pi. The Pi itself was powered with a 2A power supply (originally an HP Touchpad power adapter).
by jdubin
Thu Jun 28, 2012 8:30 am
Forum: Graphics, sound and multimedia
Topic: Video Input Card?
Replies: 14
Views: 14083

Re: Video Input Card?

The key is to offload video encoding to an external device. Find a usb device which is v4l2 compatible that does it's own h.264 video encoding. This will free up the Raspi's CPU substantially. Plus, the Raspi's GPU has h.264 decoding built-in, so the CPU can spend it's time worrying about the other ...
by jdubin
Thu Jun 28, 2012 8:02 am
Forum: Graphics, sound and multimedia
Topic: Raspi and RTL-SDR
Replies: 3
Views: 4506

Raspi and RTL-SDR

Well, it's not polished yet, but preliminary tests show that the Raspi has enough power to do some simple NFM software-defined radio work with RTL2832U-based DVB-T USB TV tuners . I was able to compile rtl_fm (an optimized version of Osmocom's rtl-sdr software), which allowed the Raspi to tune a fre...

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