.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later .. c:namespace:: RC

.. _lirc_set_send_duty_cycle:

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ioctl LIRC_SET_SEND_DUTY_CYCLE

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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.