| 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647 |
- .. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
- .. c:namespace:: RC
- .. _lirc_get_rec_resolution:
- *****************************
- ioctl LIRC_GET_REC_RESOLUTION
- *****************************
- Name
- ====
- LIRC_GET_REC_RESOLUTION - Obtain the value of receive resolution, in microseconds.
- Synopsis
- ========
- .. c:macro:: LIRC_GET_REC_RESOLUTION
- ``int ioctl(int fd, LIRC_GET_REC_RESOLUTION, __u32 *microseconds)``
- Arguments
- =========
- ``fd``
- File descriptor returned by open().
- ``microseconds``
- Resolution, in microseconds.
- Description
- ===========
- Some receivers have maximum resolution which is defined by internal
- sample rate or data format limitations. E.g. it's common that
- signals can only be reported in 50 microsecond steps.
- This ioctl returns the integer value with such resolution, with can be
- used by userspace applications like lircd to automatically adjust the
- tolerance value.
- 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.
|
