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+.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
+.. c:namespace:: RC
+
+.. _lirc_set_measure_carrier_mode:
+
+***********************************
+ioctl LIRC_SET_MEASURE_CARRIER_MODE
+***********************************
+
+Name
+====
+
+LIRC_SET_MEASURE_CARRIER_MODE - enable or disable measure mode
+
+Synopsis
+========
+
+.. c:macro:: LIRC_SET_MEASURE_CARRIER_MODE
+
+``int ioctl(int fd, LIRC_SET_MEASURE_CARRIER_MODE, __u32 *enable)``
+
+Arguments
+=========
+
+``fd``
+    File descriptor returned by open().
+
+``enable``
+    enable = 1 means enable measure mode, enable = 0 means disable measure
+    mode.
+
+Description
+===========
+
+.. _lirc-mode2-frequency:
+
+Enable or disable measure mode. If enabled, from the next key
+press on, the driver will send ``LIRC_MODE2_FREQUENCY`` packets. By
+default this should be turned off.
+
+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.