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