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hi guys

my old mp3 player has been damaged, means i cant hear anything but the player itself is still working great
my idea was to code a little os for it but there are some problems as follow:
-how can i write to the flash? (i mean there are 20mb which i cant use and if i try to formatt, the player os is still starting)
-are there any datasheets? because i dont know which ports are given or not and so on

my mp3 player is a hypersound xd 512mb from yakumo but i cant find any informations about that
hope u can help me

Wrong forum. This is OS Design and Theory. Post reported.

Moved to where it belongs.

Check this out: http://www.rockbox.org

It's an open source OS (well actually, firmware) for MP3 players. Looks real nifty!

thank you for the link, but the software given is not compatible with my mp3
i have searched a bit and i found which processor is built on it: 75 mips dsp
do u know anything about it?

Woellchen wrote:thank you for the link, but the software given is not compatible with my mp3
i have searched a bit and i found which processor is built on it: 75 mips dsp
do u know anything about it?

While I understand your curiosity about the device, the information you've given us is extremely vague..

MIPS can sometimes refer to the architecture, or as a form of measurement..

Read DSP..

In this case, it could indicate that it's a 75 MHz MIPS device... but most likely it's a device capable of executing 75(Million instructions per second), the exact architecture being unknown.

I'm not sure what the commonly used architecture for MP3 players is, but I would assume it's something relativity slow.. most of the audio decoding would be done by an additional chip not the devices processor, which is most likely just used for the control software.

I'm also interested in this stuff, but I haven't really looked into it much.. my only advice is to disassemble it.. write down what's written on the individual IC chips and use Google to find datasheets.

I hope you find what you're looking for... don't be discouraged, consider posting pictures of challenging looking components.. past threads have indicated interest in searching for them.

This is an OS development forum, and I think breaking away from the 'standard' x86 architectures or even from just non-embedded devices would be great. I've always been interested in programming for common electronics (mp3 players, dvd players, switches/routers, phones, etc...). I'll definitely try to aid in this project if it starts developing, although I may not be much help.