thanks mr. Howard for your time, i don't remember what is "HCI commands" and "i2s", can you help me ? hmmm, and is need to have this chip in the device ? and how i can use it ? via assembly language? i can't configure the BT or WLAN to use it and receive low frequency ?
On Dec 19, 7:29 pm, "Howard M. Harte" <[email protected]> wrote: > The FM radio receiver is built in to the same chip that does the WLAN > and BT. It is actually a third radio in those chips. This is true of > the Droid X, which uses the TI WL1271 BT/WLAN/FM chip, and many of the > HTC and Samsung devices use the Broadcom BCM4329, which also has BT/ > WLAN/FM. > > I think vendor-specific HCI commands are used on the BT UART interface > to tune the radio. With some kernel hacking, it should be possible to > snoop the HCI commands. > > The FM audio out is an analog stream that is fed into a mixer, but it > is also possible to get digital audio out over i2s, and probably also > the HCI interface, but I dont think that method is used. > > There is no FM standard API in Android, but it would be nice to create > one.... > > -Howard > > On Dec 19, 3:14 am, wolf <[email protected]> wrote:> do you can make me an > a example code ? and a sketch with a example > > phone how it works ? can i use the bluetooth as an antenna (yes i know > > it's have own API and it's works on 2.4 Ghz and the radio usually 87.5 > > to 108.0 MHz) ? do you know how to use the headphones as antenna or wi- > > fi or whatever ? what do you think about this? do you have ôï suggest > > me a site ? thanks mr bob for your time, you help me a lot!!!! sorry > > for my bad english ....... p.s. i am search wikipedia and other sites, > > i have make a simple plan. Do you work on FM Radio ? and how it's > > works low level phone access ? hmmm... maybe can help me very > > very ...... > > > On Dec 19, 1:44 am, Bob Kerns <[email protected]> wrote: > > > > Me, either. But I'll speculate as to how it works. > > > > Phones are radios. The radio signal is processed and decoded into > > > audio, and fed into the audio streams. The mechanisms for this are > > > open source. > > > > The FM radio signal is a radio signal that is processed and decoded > > > into audio. I bet it works much the same way. > > > > So, if you're serious about figuring it out, I'd start by going and > > > learning how the low level phone access works (i.e. how the audio is > > > routed from radio to audio mixer). That part is open source. > > > > Then I'd start reverse engineering, and find what calls the FM radio > > > app is making that are similar to how the phone works to set up the > > > audio stream for phone callls, and from there, I'd look for what's > > > different, that might be how it tells the radio what stream to route > > > to where. > > > > I doubt there's an easier way to do it, if that's how it's set up to > > > work. If, on the other hand, it's just exposed as a separate device, > > > I'd look at what device drivers are added to the kernel, and look to > > > see how the FM Radio app turns it on and accesses it. (And the FM > > > Radio functionality does have to be specifically turned on by the app. > > > I'm guessing it's normally disabled due to battery consumption, but I > > > don't really know). > > > > On Dec 18, 1:19 pm, Mark Murphy <[email protected]> wrote:> On Sat, > > > Dec 18, 2010 at 4:13 PM, wolf <[email protected]> wrote: > > > > > thanks again mr bob, and how i can to view the code from FM Radio app? > > > > > I am not aware of any "FM Radio" apps for Android that are open source. -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
