48 lines
1.1 KiB
ReStructuredText
48 lines
1.1 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
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.. c:namespace:: RC
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.. _lirc_get_rec_resolution:
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*****************************
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ioctl LIRC_GET_REC_RESOLUTION
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*****************************
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Name
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====
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LIRC_GET_REC_RESOLUTION - Obtain the value of receive resolution, in microseconds.
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Synopsis
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========
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.. c:macro:: LIRC_GET_REC_RESOLUTION
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``int ioctl(int fd, LIRC_GET_REC_RESOLUTION, __u32 *microseconds)``
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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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``microseconds``
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Resolution, in microseconds.
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Description
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===========
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Some receivers have maximum resolution which is defined by internal
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sample rate or data format limitations. E.g. it's common that
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signals can only be reported in 50 microsecond steps.
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This ioctl returns the integer value with such resolution, with can be
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used by userspace applications like lircd to automatically adjust the
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tolerance value.
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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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