Based on kernel version 4.7.2. Page generated on 2016-08-22 22:44 EST.
1 <refentry id="FE_SET_TONE"> 2 <refmeta> 3 <refentrytitle>ioctl FE_SET_TONE</refentrytitle> 4 &manvol; 5 </refmeta> 6 7 <refnamediv> 8 <refname>FE_SET_TONE</refname> 9 <refpurpose>Sets/resets the generation of the continuous 22kHz tone.</refpurpose> 10 </refnamediv> 11 12 <refsynopsisdiv> 13 <funcsynopsis> 14 <funcprototype> 15 <funcdef>int <function>ioctl</function></funcdef> 16 <paramdef>int <parameter>fd</parameter></paramdef> 17 <paramdef>int <parameter>request</parameter></paramdef> 18 <paramdef>enum fe_sec_tone_mode *<parameter>tone</parameter></paramdef> 19 </funcprototype> 20 </funcsynopsis> 21 </refsynopsisdiv> 22 23 <refsect1> 24 <title>Arguments</title> 25 <variablelist> 26 <varlistentry> 27 <term><parameter>fd</parameter></term> 28 <listitem> 29 <para>&fe_fd;</para> 30 </listitem> 31 </varlistentry> 32 <varlistentry> 33 <term><parameter>request</parameter></term> 34 <listitem> 35 <para>FE_SET_TONE</para> 36 </listitem> 37 </varlistentry> 38 <varlistentry> 39 <term><parameter>tone</parameter></term> 40 <listitem> 41 <para>pointer to &fe-sec-tone-mode;</para> 42 </listitem> 43 </varlistentry> 44 </variablelist> 45 </refsect1> 46 47 <refsect1> 48 <title>Description</title> 49 50 <para>This ioctl is used to set the generation of the continuous 22kHz tone. 51 This call requires read/write permissions.</para> 52 <para>Usually, satellite antenna subsystems require that the digital TV 53 device to send a 22kHz tone in order to select between high/low band on 54 some dual-band LNBf. It is also used to send signals to DiSEqC equipment, 55 but this is done using the DiSEqC ioctls.</para> 56 <para>NOTE: if more than one device is connected to the same antenna, 57 setting a tone may interfere on other devices, as they may lose 58 the capability of selecting the band. So, it is recommended that 59 applications would change to SEC_TONE_OFF when the device is not used.</para> 60 61 &return-value-dvb; 62 </refsect1> 63 64 <refsect1 id="fe-sec-tone-mode-t"> 65 <title>enum fe_sec_tone_mode</title> 66 67 <table pgwide="1" frame="none" id="fe-sec-tone-mode"> 68 <title>enum fe_sec_tone_mode</title> 69 <tgroup cols="2"> 70 &cs-def; 71 <thead> 72 <row> 73 <entry>ID</entry> 74 <entry>Description</entry> 75 </row> 76 </thead> 77 <tbody valign="top"> 78 <row> 79 <entry align="char" id="SEC-TONE-ON"><constant>SEC_TONE_ON</constant></entry> 80 <entry align="char">Sends a 22kHz tone burst to the antenna</entry> 81 </row><row> 82 <entry align="char" id="SEC-TONE-OFF"><constant>SEC_TONE_OFF</constant></entry> 83 <entry align="char">Don't send a 22kHz tone to the antenna 84 (except if the FE_DISEQC_* ioctls are called)</entry> 85 </row> 86 </tbody> 87 </tgroup> 88 </table> 89 </refsect1> 90 91 </refentry>