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 ****************************** 7 ioctl LIRC_SET_SEND_DUTY_CYCLE 8 ****************************** 9 10 Name 11 ==== 12 13 LIRC_SET_SEND_DUTY_CYCLE - Set the duty cycle of the carrier signal for 14 IR transmit. 15 16 Synopsis 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 23 Arguments 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 33 Description 34 =========== 35 36 Get/set the duty cycle of the carrier signal for IR transmit. 37 38 Currently, no special meaning is defined for 0 or 100, but this 39 could be used to switch off carrier generation in the future, so 40 these values should be reserved. 41 42 Return Value 43 ============ 44 45 On success 0 is returned, on error -1 and the ``errno`` variable is set 46 appropriately. The generic error codes are described at the 47 :ref:`Generic Error Codes <gen-errors>` chapter.
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