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- .. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
- .. c:namespace:: RC
- .. _lirc_set_rec_carrier_range:
- ********************************
- ioctl LIRC_SET_REC_CARRIER_RANGE
- ********************************
- Name
- ====
- LIRC_SET_REC_CARRIER_RANGE - Set lower bound of the carrier used to modulate
- IR receive.
- Synopsis
- ========
- .. c:macro:: LIRC_SET_REC_CARRIER_RANGE
- ``int ioctl(int fd, LIRC_SET_REC_CARRIER_RANGE, __u32 *frequency)``
- Arguments
- =========
- ``fd``
- File descriptor returned by open().
- ``frequency``
- Frequency of the carrier that modulates PWM data, in Hz.
- Description
- ===========
- This ioctl sets the upper range of carrier frequency that will be recognized
- by the IR receiver.
- .. note::
- To set a range use :ref:`LIRC_SET_REC_CARRIER_RANGE
- <LIRC_SET_REC_CARRIER_RANGE>` with the lower bound first and later call
- :ref:`LIRC_SET_REC_CARRIER <LIRC_SET_REC_CARRIER>` with the upper bound.
- Return Value
- ============
- On success 0 is returned, on error -1 and the ``errno`` variable is set
- appropriately. The generic error codes are described at the
- :ref:`Generic Error Codes <gen-errors>` chapter.
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