line-level output for Sansa e200

[saratoga]

There are plenty of reasons why dock output should be line level, and I can't think of any why it shouldn't.

As I said before, probably just lack of interest on the part of people who actually have a line out device.  If you want you can try this build:

http://duke.edu/~mgg6/rockbox/rockbox.7z

No idea if it works, I don't have any way to test it.  Heres the code in case someone wants to play with it:

Code: [Select]

Index: firmware/drivers/audio/as3514.c
===================================================================
--- firmware/drivers/audio/as3514.c     (revision 27794)
+++ firmware/drivers/audio/as3514.c     (working copy)
@@ -256,7 +256,7 @@
     ascodec_suppressor_on(false);
 #endif
 
-#if defined(SANSA_E200V2) || defined(SANSA_FUZE)
+#if defined(SANSA_E200) || defined(SANSA_E200V2) || defined(SANSA_FUZE)
     /* Set line out volume to 0dB */
     as3514_write_masked(AS3514_LINE_OUT_R, 0x1b, AS3514_VOL_MASK);
     as3514_write_masked(AS3514_LINE_OUT_L, 0x1b, AS3514_VOL_MASK);

 

[yapper]

It doesn't seem to work on a v1 E200 and Griffin powerdock - the volume remains unaltered.

Edit: there is a seller on ebay offering powerdocks for $6.50 at the moment

[saratoga]

It doesn't seem to work on a v1 E200 and Griffin powerdock - the volume remains unaltered.

Edit: there is a seller on ebay offering powerdocks for $6.50 at the moment

unaltered == muted?

[yapper]

No, the volume remain unaltered from what it was set to before I connected the DAP to the dock (with Select). I initially had it at +6db and it stayed the same. Next time I set it low (-50-ish) and again it remained unaltered.

Both times the volume varied on the line out if I adjusted the volume.

[mc2739]

The line out on the e200v1 appears to be connected directly to the headphone output.  Adjusting the AS3514 line out level has no effect on the line out volume.  The line out level can only be changed by adjusting the headphone volume.

Adjusting the headphone level automatically could be dangerous in the case where someone is listening through the headphones and connects their dock/charger for the purpose of charging the battery.  The headphone level would be switched to 0db which could potentially cause hearing damage.

With my e200v1, I use a saved config file to switch the volume when I wish to use the line out.  In my opinion, it is easier to load the config file than to manually adjust the volume.

[torne]

There should be no noticable/measurable effect on battery life from setting the volume to 0dB, by the way. The power consumed by the amplifier on a portable player is miniscule compared to the rest of the device.

[saratoga]

The line out on the e200v1 appears to be connected directly to the headphone output.  Adjusting the AS3514 line out level has no effect on the line out volume.  The line out level can only be changed by adjusting the headphone volume.

Adjusting the headphone level automatically could be dangerous in the case where someone is listening through the headphones and connects their dock/charger for the purpose of charging the battery.  The headphone level would be switched to 0db which could potentially cause hearing damage.

So it would need to work like on the Fuzev2 where it mutes the HP and maxes the line out?

[soap]

I'd prefer not to crank up my volume -- it's a waste of battery <snip>

I rather doubt that.  Without headphones connected there is no power being transferred.

[mc2739]

So it would need to work like on the Fuzev2 where it mutes the HP and maxes the line out?

It cannot work like the Fuzev2.  The Fuzev2 has a single DAC which is switched to two outputs (headphone & line out).  The e200v1 has two DACs, each with their own outputs, but instead of line out using it's own DAC, it is connected to the headphone DAC.  The line out DAC is unused.

When you adjust the level of the line out DAC, the line out connection stays at the same volume level.  When you adjust the level of the headphone DAC, the volume  level of both the headphones and the line out connection change.

[PickupBetty]

Thanks for the discussion, everyone.  I can rest easy, now that I know it's a matter of "can't" instead of "won't."  Somehow the irritation doesn't exists anymore.