Rockbox General > Rockbox General Discussion
Battery measurements at power on, V2 Recorder
dreamlayers:
--- Quote from: Youb on December 04, 2008, 01:34:56 PM ---Hello there,
First, I'm new to the forum, and I must say that Rockbox rocks! (somebody must have said that before me...)
--- End quote ---
Hi, and welcome to the forum!
--- Quote from: Youb on December 04, 2008, 01:34:56 PM ---I am experiencing the exact same problem as you with my FM recorder. I'm using Rockbox 3.0.1 (installed by copying the files on the hard drive). From what I understood I would need to compile a custom Rockbox to tweak my Rockbox the same way you did. I guess I would be able to compile it myself if I take some time... But I'd like to ask you a few questions before...
First, you said you flashed a RomBox, if I remeber what I read some time ago, this is flashing Rockbox instead of just putting it on the hard drive right?
--- End quote ---
With RomBox code runs from ROM and constant data is only in ROM. This leaves more memory free for storing MP3 data, so the hard disk needs to spin up less often. It also speeds up startup because the Rockbox doesn't need to be loaded from disk or decompressed. The main downside is that current versions of Rockbox cannot fit in ROM, and features need to be disabled. For more information see wiki page. When I compiled Rockbox 3.0, disabling the database wasn't enough and I also had to disable the FM tuner hardware.
Rockbox can also be flashed in compressed format. The decompression is quite fast, but no RAM is saved.
--- Quote from: Youb on December 04, 2008, 01:34:56 PM ---Second, is there an option to turn off low batt mode within the configuration files ? I've spotted "Announce Battery Level" in the manual, but I guess this is a voice option...
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There is no configuration option. There is a compile-time option however: define NO_LOW_BATTERY_SHUTDOWN (see firmware/powermgmt.c)
--- Quote from: Youb on December 04, 2008, 01:34:56 PM ---Last question... would an already-compiled version with no low battery shutdown be available somewhere? I am a bit lazy I know... :D
Thanks...
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I'm not aware of any already distributed build. Here's what I'm currently using on my V2 recorder. It's an older version, from November 2007, because that gives me more buffer space. To get more buffer space I've also removed language and codepage changing, the voice interface and radio support. The database has been removed to allow for RomBox. I could rebuild enabling FM if you want.
Youb:
Thank you very much sir!
I am going to read about flashing RomBox properly, and give this a try. I don't think I'll ever use FM tuner, or database, so it seems to be the perfect solution.
I'll let you know. Cheers.
Youb:
Hi,
I have been trying to flash my player.
Before doing ssomething stupid I prefer asking you...
I managed to back up my ROM on my computer (easy :)).
I have put the content of your zip file to my Jukebox, and I managed to start your Rockbox using ROLO.
Now if I replace the ajbrec.ajz file and the .rockbox folder I had with yours, my Jukebox boots up with the Archos firmware.
From what I understood to flash the Jukebox I need to first play your ajbrec.ajz file, and then play the rombox.ucl file in the .rockbox folder, right?
Now I'm a bit afraid of doing it because the Jukebox loads the Archos firmware with your files. Is it normal? I might do something wrong.
Thanks in advance...
dreamlayers:
You'd first need to install BootBox so you have enough space for RomBox. This removes the Archos firmware. I recommend doing it from an official build like Rockbox 3.0.1 because some risk is involved.
Regarding ajbrec.ajz not loading, I remember the Jukebox 6000 had some bug which caused the firmware upgrade file to not load. This from the FAQ seems relevant. But since it's simple, I might as well re-build what I have for the FM recorder... here.
Flashing RomBox shouldn't involve any risk because BootBox allows you to load ajbrec.ajz or enter USB mode. Loading ajbrec.ajz is simple, just hold F1 (the top-left button) and then hold on to turn on the device. Entering USB mode seems to require holding F1, plugging in USB, and then when "Rescue boot" appears continually pressing F1 until "USB mode" appears.
Edit: I just found that if the device is idle, the battery can discharge below 2V, so:
WARNING: This build disables low battery shutdown. If the device is left on but not playing, it may be possible to overdischarge the battery. According to various sources, overdischarge damages lithium-ion batteries. Also, recovery from that state may require charging the battery externally or jump-starting the device. Under normal use, the device will shut down when the hard drive is used before the battery is overdischarged, and if not playing, idle shutoff will shut it down.
Youb:
Awesome !
I've followed the instructions, and now, my player boots up in no time, and I can boot it up with like 5% battery left, versus 65% left before the upgrade.
Thanks a lot !
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