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- .. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
- .. c:namespace:: RC
- .. _lirc_set_send_duty_cycle:
- ******************************
- ioctl LIRC_SET_SEND_DUTY_CYCLE
- ******************************
- Name
- ====
- LIRC_SET_SEND_DUTY_CYCLE - Set the duty cycle of the carrier signal for
- IR transmit.
- Synopsis
- ========
- .. c:macro:: LIRC_SET_SEND_DUTY_CYCLE
- ``int ioctl(int fd, LIRC_SET_SEND_DUTY_CYCLE, __u32 *duty_cycle)``
- Arguments
- =========
- ``fd``
- File descriptor returned by open().
- ``duty_cycle``
- Duty cicle, describing the pulse width in percent (from 1 to 99) of
- the total cycle. Values 0 and 100 are reserved.
- Description
- ===========
- Get/set the duty cycle of the carrier signal for IR transmit.
- Currently, no special meaning is defined for 0 or 100, but this
- could be used to switch off carrier generation in the future, so
- these values should be reserved.
- 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.
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