Rockbox mail archiveSubject: FM tuner discussion
FM tuner discussion
From: RaeNye <raenye_at_netvision.net.il>
Date: Mon, 29 May 2006 18:16:38 +0200
Following Matze88m's patch (http://www.rockbox.org/tracker/task/5448).
Comment if you please.
Matthias uploaded a patch for TEA5767 tuner chip w/ unstandard FM band
support and signal strength support. I commented about it in view of X5's
isomorphic FM chip.
>Although you might have asked in the board or opened a new patch thread
>have anything todo with tea5767), I can tell you of a problem with 5767:
>value was only updated after some sending to the tunerchip... That is why I
>force mono to false every time before the reading.
Interesting. Doesn't that affect reception as the PLL is reset?
Can't you just send the same settings over and over?
>But I think for the one who needs this indicator, it
>is a really good thing. Perhaps you could (or I could?) add an
>Signalindicator with regularly updates only when the backlight is on (this
>cause problems with the remote... but that is another point. as i dont have
>remote i can't take this into account) to reduce noise and cpu power
I'm not sure about all platforms, but when listening to FM radio (cf.
you're not using I2S at all (bypass/monitor mode of the TLV320/UDA1380),
>Maybe we could constantly put the cpu into idle mode while radio is on and
>backlight is off? That would further remove noise. And it should decrease
>drain a bit. We could even put the whole thing into a "sleep"state after 1
>minute of backlight off so rockbox does NOTHING than checking for keys
>once a second... Shouldnt this increase battery life drastically? (->sleep
>for Ram, sleep mode for lcd controller, maybe even shutdown the
>It should be possible to listen to radio with about only 50mA (15 for
>another 15 for soundmixer and amplifier and some... well... small amounts
>cpu and powercontroller and so on), that would be 1300/50 -> >25 hours with
Power issues... It could be a different discussion.
Did you know? X5 OF uses 57 cpu speeds & settings, whereas RB has only
I would rather see platform-independent "media modes"
(e.g., playback/record from mic/line-in/fm/spdif/file)
exported to the API rather than interlaced in gui, so that you could write a
plugin that uses them
(wild idea example: a plugin that plays a mp3 files when commercial break
jingle is heard on FM and restores FM playback when it's done)
Yes, this post is somewhat incoherent. Sorry.
Received on 2006-05-29