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?
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.