1.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later 2.. c:namespace:: RC 3 4.. _lirc_set_send_duty_cycle: 5 6****************************** 7ioctl LIRC_SET_SEND_DUTY_CYCLE 8****************************** 9 10Name 11==== 12 13LIRC_SET_SEND_DUTY_CYCLE - Set the duty cycle of the carrier signal for 14IR transmit. 15 16Synopsis 17======== 18 19.. c:macro:: LIRC_SET_SEND_DUTY_CYCLE 20 21``int ioctl(int fd, LIRC_SET_SEND_DUTY_CYCLE, __u32 *duty_cycle)`` 22 23Arguments 24========= 25 26``fd`` 27 File descriptor returned by open(). 28 29``duty_cycle`` 30 Duty cicle, describing the pulse width in percent (from 1 to 99) of 31 the total cycle. Values 0 and 100 are reserved. 32 33Description 34=========== 35 36Get/set the duty cycle of the carrier signal for IR transmit. 37 38Currently, no special meaning is defined for 0 or 100, but this 39could be used to switch off carrier generation in the future, so 40these values should be reserved. 41 42Return Value 43============ 44 45On success 0 is returned, on error -1 and the ``errno`` variable is set 46appropriately. The generic error codes are described at the 47:ref:`Generic Error Codes <gen-errors>` chapter. 48