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YEN SIGN h]h¥}hjLsbah}(h]h ]h"]yenah$]h&]uh1hhhhKRhhhhubhsection)}(hhh](htitle)}(h3The Silicon Labs Si4713 FM Radio Transmitter Driverh]h3The Silicon Labs Si4713 FM Radio Transmitter Driver}(hjbhhhNhNubah}(h]h ]h"]h$]h&]uh1j`hj]hhhhhKubh paragraph)}(h'Copyright |copy| 2009 Nokia Corporationh](h Copyright }(hjrhhhNhNubh©}(hjrhhhNhNubh 2009 Nokia Corporation}(hjrhhhNhNubeh}(h]h ]h"]h$]h&]uh1jphhhKhj]hhubjq)}(h6Contact: Eduardo Valentin h](hContact: Eduardo Valentin <}(hjhhhNhNubh reference)}(heduardo.valentin@nokia.comh]heduardo.valentin@nokia.com}(hjhhhNhNubah}(h]h ]h"]h$]h&]refuri!mailto:eduardo.valentin@nokia.comuh1jhjubh>}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1jphhhK hj]hhubj\)}(hhh](ja)}(hInformation about the Deviceh]hInformation about the Device}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j`hjhhhhhKubjq)}(hThis chip is a Silicon Labs product. It is an I2C device, currently on 0x63 address. Basically, it has transmission and signal noise level measurement features.h]hThis chip is a Silicon Labs product. It is an I2C device, currently on 0x63 address. Basically, it has transmission and signal noise level measurement features.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jphhhKhjhhubjq)}(hThe Si4713 integrates transmit functions for FM broadcast stereo transmission. The chip also allows integrated receive power scanning to identify low signal power FM channels.h]hThe Si4713 integrates transmit functions for FM broadcast stereo transmission. The chip also allows integrated receive power scanning to identify low signal power FM channels.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jphhhKhjhhubjq)}(hThe chip is programmed using commands and responses. There are also several properties which can change the behavior of this chip.h]hThe chip is programmed using commands and responses. There are also several properties which can change the behavior of this chip.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jphhhKhjhhubjq)}(hNUsers must comply with local regulations on radio frequency (RF) transmission.h]hNUsers must comply with local regulations on radio frequency (RF) transmission.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jphhhKhjhhubeh}(h]information-about-the-deviceah ]h"]information about the deviceah$]h&]uh1j[hj]hhhhhKubj\)}(hhh](ja)}(hDevice driver descriptionh]hDevice driver description}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j`hjhhhhhKubjq)}(hlThere are two modules to handle this device. One is an I2C device driver and the other is a platform driver.h]hlThere are two modules to handle this device. One is an I2C device driver and the other is a platform driver.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jphhhKhjhhubjq)}(hThe I2C device driver exports a v4l2-subdev interface to the kernel. All properties can also be accessed by v4l2 extended controls interface, by using the v4l2-subdev calls (g_ext_ctrls, s_ext_ctrls).h]hThe I2C device driver exports a v4l2-subdev interface to the kernel. All properties can also be accessed by v4l2 extended controls interface, by using the v4l2-subdev calls (g_ext_ctrls, s_ext_ctrls).}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jphhhK"hjhhubjq)}(hThe platform device driver exports a v4l2 radio device interface to user land. So, it uses the I2C device driver as a sub device in order to send the user commands to the actual device. Basically it is a wrapper to the I2C device driver.h]hThe platform device driver exports a v4l2 radio device interface to user land. So, it uses the I2C device driver as a sub device in order to send the user commands to the actual device. Basically it is a wrapper to the I2C device driver.}(hj*hhhNhNubah}(h]h ]h"]h$]h&]uh1jphhhK&hjhhubjq)}(hApplications can use v4l2 radio API to specify frequency of operation, mute state, etc. But mostly of its properties will be present in the extended controls.h]hApplications can use v4l2 radio API to specify frequency of operation, mute state, etc. But mostly of its properties will be present in the extended controls.}(hj8hhhNhNubah}(h]h ]h"]h$]h&]uh1jphhhK*hjhhubjq)}(hRWhen the v4l2 mute property is set to 1 (true), the driver will turn the chip off.h]hRWhen the v4l2 mute property is set to 1 (true), the driver will turn the chip off.}(hjFhhhNhNubah}(h]h ]h"]h$]h&]uh1jphhhK-hjhhubeh}(h]device-driver-descriptionah ]h"]device driver descriptionah$]h&]uh1j[hj]hhhhhKubj\)}(hhh](ja)}(hProperties descriptionh]hProperties description}(hj_hhhNhNubah}(h]h ]h"]h$]h&]uh1j`hj\hhhhhK0ubjq)}(hbThe properties can be accessed using v4l2 extended controls. Here is an output from v4l2-ctl util:h]hbThe properties can be accessed using v4l2 extended controls. Here is an output from v4l2-ctl util:}(hjmhhhNhNubah}(h]h ]h"]h$]h&]uh1jphhhK2hj\hhubh literal_block)}(hX/ # v4l2-ctl -d /dev/radio0 --all -L Driver Info: Driver name : radio-si4713 Card type : Silicon Labs Si4713 Modulator Bus info : Driver version: 0 Capabilities : 0x00080800 RDS Output Modulator Audio output: 0 (FM Modulator Audio Out) Frequency: 1408000 (88.000000 MHz) Video Standard = 0x00000000 Modulator: Name : FM Modulator Capabilities : 62.5 Hz stereo rds Frequency range : 76.0 MHz - 108.0 MHz Subchannel modulation: stereo+rds User Controls mute (bool) : default=1 value=0 FM Radio Modulator Controls rds_signal_deviation (int) : min=0 max=90000 step=10 default=200 value=200 flags=slider rds_program_id (int) : min=0 max=65535 step=1 default=0 value=0 rds_program_type (int) : min=0 max=31 step=1 default=0 value=0 rds_ps_name (str) : min=0 max=96 step=8 value='si4713 ' rds_radio_text (str) : min=0 max=384 step=32 value='' audio_limiter_feature_enabled (bool) : default=1 value=1 audio_limiter_release_time (int) : min=250 max=102390 step=50 default=5010 value=5010 flags=slider audio_limiter_deviation (int) : min=0 max=90000 step=10 default=66250 value=66250 flags=slider audio_compression_feature_enabl (bool) : default=1 value=1 audio_compression_gain (int) : min=0 max=20 step=1 default=15 value=15 flags=slider audio_compression_threshold (int) : min=-40 max=0 step=1 default=-40 value=-40 flags=slider audio_compression_attack_time (int) : min=0 max=5000 step=500 default=0 value=0 flags=slider audio_compression_release_time (int) : min=100000 max=1000000 step=100000 default=1000000 value=1000000 flags=slider pilot_tone_feature_enabled (bool) : default=1 value=1 pilot_tone_deviation (int) : min=0 max=90000 step=10 default=6750 value=6750 flags=slider pilot_tone_frequency (int) : min=0 max=19000 step=1 default=19000 value=19000 flags=slider pre_emphasis_settings (menu) : min=0 max=2 default=1 value=1 tune_power_level (int) : min=0 max=120 step=1 default=88 value=88 flags=slider tune_antenna_capacitor (int) : min=0 max=191 step=1 default=0 value=110 flags=sliderh]hX/ # v4l2-ctl -d /dev/radio0 --all -L Driver Info: Driver name : radio-si4713 Card type : Silicon Labs Si4713 Modulator Bus info : Driver version: 0 Capabilities : 0x00080800 RDS Output Modulator Audio output: 0 (FM Modulator Audio Out) Frequency: 1408000 (88.000000 MHz) Video Standard = 0x00000000 Modulator: Name : FM Modulator Capabilities : 62.5 Hz stereo rds Frequency range : 76.0 MHz - 108.0 MHz Subchannel modulation: stereo+rds User Controls mute (bool) : default=1 value=0 FM Radio Modulator Controls rds_signal_deviation (int) : min=0 max=90000 step=10 default=200 value=200 flags=slider rds_program_id (int) : min=0 max=65535 step=1 default=0 value=0 rds_program_type (int) : min=0 max=31 step=1 default=0 value=0 rds_ps_name (str) : min=0 max=96 step=8 value='si4713 ' rds_radio_text (str) : min=0 max=384 step=32 value='' audio_limiter_feature_enabled (bool) : default=1 value=1 audio_limiter_release_time (int) : min=250 max=102390 step=50 default=5010 value=5010 flags=slider audio_limiter_deviation (int) : min=0 max=90000 step=10 default=66250 value=66250 flags=slider audio_compression_feature_enabl (bool) : default=1 value=1 audio_compression_gain (int) : min=0 max=20 step=1 default=15 value=15 flags=slider audio_compression_threshold (int) : min=-40 max=0 step=1 default=-40 value=-40 flags=slider audio_compression_attack_time (int) : min=0 max=5000 step=500 default=0 value=0 flags=slider audio_compression_release_time (int) : min=100000 max=1000000 step=100000 default=1000000 value=1000000 flags=slider pilot_tone_feature_enabled (bool) : default=1 value=1 pilot_tone_deviation (int) : min=0 max=90000 step=10 default=6750 value=6750 flags=slider pilot_tone_frequency (int) : min=0 max=19000 step=1 default=19000 value=19000 flags=slider pre_emphasis_settings (menu) : min=0 max=2 default=1 value=1 tune_power_level (int) : min=0 max=120 step=1 default=88 value=88 flags=slider tune_antenna_capacitor (int) : min=0 max=191 step=1 default=0 value=110 flags=slider}hj}sbah}(h]h ]h"]h$]h&]hhƌforcelanguagenonehighlight_args}uh1j{hhhK5hj\hhubjq)}(hHere is a summary of them:h]hHere is a summary of them:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jphhhKchj\hhubh bullet_list)}(hhh]h list_item)}(h-Pilot is an audible tone sent by the device. h]jq)}(h,Pilot is an audible tone sent by the device.h]h,Pilot is an audible tone sent by the device.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jphhhKehjubah}(h]h ]h"]h$]h&]uh1jhjhhhhhNubah}(h]h ]h"]h$]h&]bullet*uh1jhhhKehj\hhubj)}(hhh](j)}(hDpilot_frequency - Configures the frequency of the stereo pilot tone.h]jq)}(hjh]hDpilot_frequency - Configures the frequency of the stereo pilot tone.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jphhhKghjubah}(h]h ]h"]h$]h&]uh1jhjhhhhhNubj)}(hBpilot_deviation - Configures pilot tone frequency deviation level.h]jq)}(hjh]hBpilot_deviation - Configures pilot tone frequency deviation level.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jphhhKhhjubah}(h]h ]h"]h$]h&]uh1jhjhhhhhNubj)}(hj2jMjAj\jPjkj_jzjnjj}jjjjjjjjjjjjjjjjjjjjj.j"j=j1jLj@j[jOjjj^jyjmjj|jjjjjjjjjjjjjjjjjjjjj-j!j<j0jKj?jZjNjij]jxjljj{jjjjjjjjjjjjjjjjjjjjj,j j;j/jJj>jYjMjhj\jwjkjjzjjjjjjjjjjjjjjjjj jjjj+jj:j.jIj=jXjLusubstitution_names}(amphaposjastjbrvbarj bsolj/centj>colonjMcommaj\commatjkcopyjzcurrenjdarrjdegjdividejdollarjequalsjexcljfrac12jfrac14jfrac18jfrac34jfrac38j.frac58j=frac78jLgtj[halfjjhorbarjyhyphenjiexcljiquestjlaquojlarrjlcubjldquojlowbarjlparjlsqbjlsquojltj-microj<middotjKnbspjZnotjinumjxohmjordfjordmjparajpercntjperiodjplusjplusmnjpoundjquestjquotjraquoj,rarrj;rcubjJrdquojYregjhrparjwrsqbjrsquojsectjsemijshyjsoljsungjsup1jsup2jsup3j timesjtradej+uarrj:verbarjIyenjXurefnames}refids}nameids}(j j jjjYjVj3 j0 jx ju j j j j u nametypes}(j jjYj3 jx j j uh}(j j]jjjVjj0 j\ju j6 j j{ j j u footnote_refs} citation_refs} autofootnotes]autofootnote_refs]symbol_footnotes]symbol_footnote_refs] footnotes] citations]autofootnote_startKsymbol_footnote_startK id_counter collectionsCounter}Rparse_messages]transform_messages] transformerN include_log]*Documentation/admin-guide/media/si4713.rst(NNNNta decorationNhhub.