Rockbox Development > New Ports
SanDisk Sansa c200v2, m200v4, clipv1, clipv2, clip+, and fuzev2
johnc60:
I installed the latest build of Rockbox (r23773) on an m250v4 per the instructions and things seem to work pretty good.
One problem that I came across is that the audio is very low, as installed. When I raise the volume up beyond the -2dB setting, the music will play at the higher volume for a short time (seconds) and then the player just turns off. There are no warning messages. It just dies. Restarting the player returns it to the previous volume level. The original firmware plays very loud with no problems across the entire range of volume settings.
Any ideas? Any additional info needed?
-John
saratoga:
edit: Sorry, read "m200v2" as "e200v2".
FWIW, its less confusing if you call it an m200v4, since the m200v2 is probably not what you have :)
mc2739:
--- Quote from: johnc60 on November 27, 2009, 08:14:49 PM ---When I raise the volume up beyond the -2dB setting, the music will play at the higher volume for a short time (seconds) and then the player just turns off.
--- End quote ---
If you check the Current Status chart on the SansaAMS wiki page you will see that this is a known problem on the m200 "v4" port (OF v4.xx.xx).
johnc60:
Right. I corrected it to say v4. I was just following the title which says (v2). :) I actually have a v2 also. Thanks for the pointer to the chart. I've read that chart before but it didn't stick in my head.
I think it might be a power issue. If I disable the backlight, the volume can be raised up a few dB before it dies.
The Rockbox code must be setting up the audio amp or pre-amp in some strange manner on this platform or the codec is not delivering the correct input levels to the audio amp. Even at low to moderate volume, the audio is distorted. With the original firmware, the audio is clean even at ear-deafening volume levels.
Is it possible that the audio level is too low at the input of the final audio amp? Therefore, we have to crank it way up just to get a decent volume causing huge power draw and the power regulator shuts down?
-John
saratoga:
I took a quick look at line out. According to this thread:
http://www.head-fi.org/forums/f6/sansa-fuzes-diylod-v1-v2-guide-56k-421318/
The Fuze OF pulls one of the dock pins high (3v). I have confirmed this on my Fuze. A dock then connects this to another pin We currently do not know how to pull this pin high, but its probably one of the handful of unassigned GPIO pins.
According to this thread:
http://forums.rockbox.org/index.php?topic=22942.0
DBOP_DIN9 changes when a fuze dock (which uses external power to pull the dock pin high so scanning isn't needed) changes. But thats also GPIOB7, which apparently did not change according to that thread, so I'm a little confused.
Edit: I tried manually putting 3v on the dock pin and looking for a change in debug menu, but I didn't see anything. Looking more carefully at the debug menu output, I see that the GPIOB7 pin is configured as output currently, so I suppose I shouldn't see anything. On the upside, assuming I did this right, I was able to rule out GPIOA0, and GPIOC0/1. That only leaves some of the shared GPIO/DBOP pins unaccounted for.
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