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_range: 5 6******************************** 7ioctl LIRC_SET_REC_CARRIER_RANGE 8******************************** 9 10Name 11==== 12 13LIRC_SET_REC_CARRIER_RANGE - Set lower bound of the carrier used to modulate 14IR receive. 15 16Synopsis 17======== 18 19.. c:macro:: LIRC_SET_REC_CARRIER_RANGE 20 21``int ioctl(int fd, LIRC_SET_REC_CARRIER_RANGE, __u32 *frequency)`` 22 23Arguments 24========= 25 26``fd`` 27 File descriptor returned by open(). 28 29``frequency`` 30 Frequency of the carrier that modulates PWM data, in Hz. 31 32Description 33=========== 34 35This ioctl sets the upper range of carrier frequency that will be recognized 36by the IR receiver. 37 38.. note:: 39 40 To set a range use :ref:`LIRC_SET_REC_CARRIER_RANGE 41 <LIRC_SET_REC_CARRIER_RANGE>` with the lower bound first and later call 42 :ref:`LIRC_SET_REC_CARRIER <LIRC_SET_REC_CARRIER>` with the upper bound. 43 44Return Value 45============ 46 47On success 0 is returned, on error -1 and the ``errno`` variable is set 48appropriately. The generic error codes are described at the 49:ref:`Generic Error Codes <gen-errors>` chapter. 50