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47 lines
1.1 KiB
47 lines
1.1 KiB
.. 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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