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