fe-enable-high-lnb-voltage.rst (1112B)
1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2.. c:namespace:: DTV.fe 3 4.. _FE_ENABLE_HIGH_LNB_VOLTAGE: 5 6******************************** 7ioctl FE_ENABLE_HIGH_LNB_VOLTAGE 8******************************** 9 10Name 11==== 12 13FE_ENABLE_HIGH_LNB_VOLTAGE - Select output DC level between normal LNBf voltages or higher LNBf - voltages. 14 15Synopsis 16======== 17 18.. c:macro:: FE_ENABLE_HIGH_LNB_VOLTAGE 19 20``int ioctl(int fd, FE_ENABLE_HIGH_LNB_VOLTAGE, unsigned int high)`` 21 22Arguments 23========= 24 25``fd`` 26 File descriptor returned by :c:func:`open()`. 27 28``high`` 29 Valid flags: 30 31 - 0 - normal 13V and 18V. 32 33 - >0 - enables slightly higher voltages instead of 13/18V, in order 34 to compensate for long antenna cables. 35 36Description 37=========== 38 39Select output DC level between normal LNBf voltages or higher LNBf 40voltages between 0 (normal) or a value grater than 0 for higher 41voltages. 42 43Return Value 44============ 45 46On success 0 is returned. 47 48On error -1 is returned, and the ``errno`` variable is set 49appropriately. 50 51Generic error codes are described at the 52:ref:`Generic Error Codes <gen-errors>` chapter.