| .. 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. |
