| .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later |
| |
| .. _lirc_set_rec_carrier_range: |
| |
| ******************************** |
| ioctl LIRC_SET_REC_CARRIER_RANGE |
| ******************************** |
| |
| Name |
| ==== |
| |
| LIRC_SET_REC_CARRIER_RANGE - Set lower bound of the carrier used to modulate |
| IR receive. |
| |
| Synopsis |
| ======== |
| |
| .. c:function:: int ioctl( int fd, LIRC_SET_REC_CARRIER_RANGE, __u32 *frequency ) |
| :name: LIRC_SET_REC_CARRIER_RANGE |
| |
| Arguments |
| ========= |
| |
| ``fd`` |
| File descriptor returned by open(). |
| |
| ``frequency`` |
| Frequency of the carrier that modulates PWM data, in Hz. |
| |
| Description |
| =========== |
| |
| This ioctl sets the upper range of carrier frequency that will be recognized |
| by the IR receiver. |
| |
| .. note:: |
| |
| To set a range use :ref:`LIRC_SET_REC_CARRIER_RANGE |
| <LIRC_SET_REC_CARRIER_RANGE>` with the lower bound first and later call |
| :ref:`LIRC_SET_REC_CARRIER <LIRC_SET_REC_CARRIER>` with the upper bound. |
| |
| 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. |
