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 ************************** 7 ioctl LIRC_SET_REC_CARRIER 8 ************************** 9 10 Name 11 ==== 12 13 LIRC_SET_REC_CARRIER - Set carrier used to modulate IR receive. 14 15 Synopsis 16 ======== 17 18 .. c:macro:: LIRC_SET_REC_CARRIER 19 20 ``int ioctl(int fd, LIRC_SET_REC_CARRIER, __u32 *frequency)`` 21 22 Arguments 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 31 Description 32 =========== 33 34 Set 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 41 Return Value 42 ============ 43 44 On success 0 is returned, on error -1 and the ``errno`` variable is set 45 appropriately. The generic error codes are described at the 46 :ref:`Generic Error Codes <gen-errors>` chapter.
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