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1.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later2.. c:namespace:: RC3 4.. _lirc_set_rec_carrier_range:5 6********************************7ioctl LIRC_SET_REC_CARRIER_RANGE8********************************9 10Name11====12 13LIRC_SET_REC_CARRIER_RANGE - Set lower bound of the carrier used to modulate14IR receive.15 16Synopsis17========18 19.. c:macro:: LIRC_SET_REC_CARRIER_RANGE20 21``int ioctl(int fd, LIRC_SET_REC_CARRIER_RANGE, __u32 *frequency)``22 23Arguments24=========25 26``fd``27 File descriptor returned by open().28 29``frequency``30 Frequency of the carrier that modulates PWM data, in Hz.31 32Description33===========34 35This ioctl sets the upper range of carrier frequency that will be recognized36by the IR receiver.37 38.. note::39 40 To set a range use :ref:`LIRC_SET_REC_CARRIER_RANGE41 <LIRC_SET_REC_CARRIER_RANGE>` with the lower bound first and later call42 :ref:`LIRC_SET_REC_CARRIER <LIRC_SET_REC_CARRIER>` with the upper bound.43 44Return Value45============46 47On success 0 is returned, on error -1 and the ``errno`` variable is set48appropriately. The generic error codes are described at the49:ref:`Generic Error Codes <gen-errors>` chapter.50