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I'd like to modify LIRC to output non-modulated signal (without 36-39 kHz modulation). I'm looking at irsend.c, but fail to see the hardware control code. It must have been somewhere in lirc main files. Any hints?

dccharacter
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  • Oh, it must be lirc driver... irsend just writes to a device. No way I can go that deep... – dccharacter Jan 04 '14 at 19:50
  • Actually, traditional parallel port LIRC did do modulation on the PC itself. That's because LIRC hardware was originally an IR LED and a bunch of resistors hanging off the parallel/printer port. – slebetman Aug 17 '16 at 03:01

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In my case the solution was already in the driver. The modified driver for raspberry pi (lirc_rpi) takes a few parameters, among them softcarrier. So if you do:

sudo modprobe lirc_rpi softcarrier=0

the carrier wave will be eliminated.

cde
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dccharacter
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