http://www.mediafire.com/file/myjzf5jeiiz/FM.rkp
here is compiled sample FM Radio. Please test it, I want to know how it works on RK2608 or RK2706.
I noticed something great btw. Standard FM Player allows to set frequency with precision to 0,10Mhz, here I can adjust it with 0,01Mhz. I noticed that all FM stations have better signal with for example 88,22mhz instead of 88,20mhz. So fm radio works better in this RKP file than standard one :-)) Or perhaps its only my model issue.