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by edwar64896
Tue Sep 18, 2018 2:56 pm
Forum: Troubleshooting
Topic: Running into problems with serial over USB
Replies: 8
Views: 922

Re: Running into problems with serial over USB

OK update.... I have recompiled all the salient code for OSX and I am getting absolutely zero errors on the serial device in question, so there is something up with the RPi. I suspect something to do with the kernel scheduling affecting the USB/Serial interface, or possibly the serial emulation driv...
by edwar64896
Tue Sep 18, 2018 11:56 am
Forum: Troubleshooting
Topic: Running into problems with serial over USB
Replies: 8
Views: 922

Re: Running into problems with serial over USB

This is a quote from libserialport doc... * The first is that Unix traditionally provides a wide range of functionality * for dealing with serial devices at the OS level; this is exposed through the * termios API and dates to the days when serial terminals were common. If your * code relies on many ...
by edwar64896
Tue Sep 18, 2018 10:12 am
Forum: Troubleshooting
Topic: Running into problems with serial over USB
Replies: 8
Views: 922

Re: Running into problems with serial over USB

Why would a serial port need to have a concept of "raw". I can understand why a terminal display might do, but why a serial port?
by edwar64896
Mon Sep 17, 2018 3:13 pm
Forum: Troubleshooting
Topic: Running into problems with serial over USB
Replies: 8
Views: 922

Re: Running into problems with serial over USB

"...put the tty into raw mode"...

Not sure what you mean by this.

I have a serial device which I am accessing using libserialport. There are two functions sp_read and sp_write which allow me to send and receive data over the chosen port.

what would putting the tty into raw mode do for me?
by edwar64896
Mon Sep 17, 2018 5:52 am
Forum: Troubleshooting
Topic: Running into problems with serial over USB
Replies: 8
Views: 922

Running into problems with serial over USB

I am connecting a device (sound devices audio field recorder) to my RPI via a USB serial interface. I am using libserialport to manage the serial device abstraction, a C library to do the required decoding, SWIG to abstract the library and nodejs/javascript to actually do the user interfacing. I am ...
by edwar64896
Tue Aug 07, 2018 2:28 pm
Forum: Graphics, sound and multimedia
Topic: Generating SMPTE timecode on the 3.5mm jack
Replies: 8
Views: 8364

Re: Generating SMPTE timecode on the 3.5mm jack

Just wanted to let you guys know I have just completed an alpha version of a timecode generator. I'm using NTP to synch the timecode output which is pretty solid and locking the timer process to a single CPU. LTC is generated out of the GPIO ports. Will post a demo video over the next couple of days...

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