si4731 FM radio source code, is a good source of the original DEMO.

ap_radio
........\ap_fmradio.dtp
........\ap_fmradio.hex
........\ap_fmradio.prj
........\ap_fmradio.XCL
........\ap_radio.bat
........\ap_radio.h
........\autosearchhandle.c
........\basal_fmradio.c
........\fmradio.ap
........\fmradio.apc
........\fm_5800a.msa
........\fm_5800b.msa
........\I2C_Driver.msa
........\List
........\....\ap_common.lst
........\....\ap_common.s01
........\....\ap_common2.lst
........\....\ap_common2.s01
........\....\ap_fmradio.map
........\....\ap_message.lst
........\....\ap_message.s01
........\....\ap_message2.lst
........\....\ap_message2.s01
........\....\ap_message2_for_radio.lst
........\....\ap_message2_for_radio.s01
........\....\autosearchhandle.lst
........\....\autosearchhandle.s01
........\....\basal_fmradio.lst
........\....\basal_fmradio.s01
........\....\displayapi.lst
........\....\fm_5800a.lst
........\....\fm_5800b.lst
........\....\keyapi.lst
........\....\main.lst
........\....\main.s01
........\....\searchhandle.lst
........\....\searchhandle.s01
........\....\tryplaying.lst
........\....\tryplaying.s01
........\....\ui_main.lst
........\....\ui_main.s01
........\....\ui_menu.lst
........\....\ui_menu.s01
........\....\ui_slider.lst
........\....\ui_slider.s01
........\main.c
........\Obj
........\...\ap_common.r01
........\...\ap_common2.r01
........\...\ap_message.r01
........\...\ap_message2.r01
........\...\ap_message2_for_radio.r01
........\...\autosearchhandle.r01
........\...\basal_fmradio.r01
........\...\displayapi.r01
........\...\fm_5800a.r01
........\...\fm_5800b.r01
........\...\keyapi.r01
........\...\main.r01
........\...\searchhandle.r01
........\...\tryplaying.r01
........\...\ui_main.r01
........\...\ui_menu.r01
........\...\ui_slider.r01
........\README.TXT
........\searchhandle.c
........\tryplaying.c

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