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 ******************************** 7 ioctl LIRC_SET_REC_CARRIER_RANGE 8 ******************************** 9 10 Name 11 ==== 12 13 LIRC_SET_REC_CARRIER_RANGE - Set lower bound of the carrier used to modulate 14 IR receive. 15 16 Synopsis 17 ======== 18 19 .. c:macro:: LIRC_SET_REC_CARRIER_RANGE 20 21 ``int ioctl(int fd, LIRC_SET_REC_CARRIER_RANGE, __u32 *frequency)`` 22 23 Arguments 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 32 Description 33 =========== 34 35 This ioctl sets the upper range of carrier frequency that will be recognized 36 by 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 44 Return Value 45 ============ 46 47 On success 0 is returned, on error -1 and the ``errno`` variable is set 48 appropriately. The generic error codes are described at the 49 :ref:`Generic Error Codes <gen-errors>` chapter.
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