| .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later |
| |
| .. _lirc_get_rec_resolution: |
| |
| ***************************** |
| ioctl LIRC_GET_REC_RESOLUTION |
| ***************************** |
| |
| Name |
| ==== |
| |
| LIRC_GET_REC_RESOLUTION - Obtain the value of receive resolution, in microseconds. |
| |
| Synopsis |
| ======== |
| |
| .. c:function:: int ioctl( int fd, LIRC_GET_REC_RESOLUTION, __u32 *microseconds) |
| :name: LIRC_GET_REC_RESOLUTION |
| |
| 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. |
