lkml.org 
[lkml]   [2008]   [Oct]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: Toggling GPIO at 38Khz
Date
Jon Smirl <jonsmirl@gmail.com> wrote:

> I'm working on getring the LIRC IR subsystem integrated into the
> kernel. One common IR hardware implementation is based on standard
> serial ports. It uses the serial port's DCD and DTR as GPIO pins.
> This common IR hardware does not have a transmit modulator and is
> modulating the IR signal in software. Luckily is has hardware
> demodulation.
>
> There are four common IR frequencies - 36Khz, 38Khz, 40Khz, 56Khz. I
> need to create these frequencies in software. Data is then transmitted
> as 400-600us burst of these frequencies. Around 10-30 clock pulses.
[...]

The ALSA PC-Speaker sound driver might do something similar ...



\
 
 \ /
  Last update: 2008-10-08 14:07    [W:0.415 / U:0.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site