1.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later 2.. c:namespace:: RC 3 4.. _lirc_set_rec_carrier: 5 6************************** 7ioctl LIRC_SET_REC_CARRIER 8************************** 9 10Name 11==== 12 13LIRC_SET_REC_CARRIER - Set carrier used to modulate IR receive. 14 15Synopsis 16======== 17 18.. c:macro:: LIRC_SET_REC_CARRIER 19 20``int ioctl(int fd, LIRC_SET_REC_CARRIER, __u32 *frequency)`` 21 22Arguments 23========= 24 25``fd`` 26 File descriptor returned by open(). 27 28``frequency`` 29 Frequency of the carrier that modulates PWM data, in Hz. 30 31Description 32=========== 33 34Set receive carrier used to modulate IR PWM pulses and spaces. 35 36.. note:: 37 38 If called together with :ref:`LIRC_SET_REC_CARRIER_RANGE`, this ioctl 39 sets the upper bound frequency that will be recognized by the device. 40 41Return Value 42============ 43 44On success 0 is returned, on error -1 and the ``errno`` variable is set 45appropriately. The generic error codes are described at the 46:ref:`Generic Error Codes <gen-errors>` chapter. 47