Documentation / userspace-api / media / rc / lirc-set-rec-carrier-range.rst


Based on kernel version 6.11. Page generated on 2024-09-24 08:21 EST.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49
.. 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.