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47 lines
1.1 KiB
47 lines
1.1 KiB
.. SPDX-License-Identifier: GPL-2.0 OR 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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