Messages in this thread | | | From | Bodo Eggert <> | Subject | Re: Toggling GPIO at 38Khz | Date | Wed, 08 Oct 2008 14:15:19 +0200 |
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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 ...
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