Hi All,
I am considering to build CD loader replacement for my integrated car navigation system. Unfortunately mine has broken some time ago and it is hard to find new loader or spare parts. There is quite a number of people like me, having problem with CD loader on car/system I have.
Replacing the navigation unit would cost me around $1500... so I figured that I could build replacement that would connect right into navigation unit instead of CD loader. This loader has is own processors and drives all to motors and laser. So I guess that protocol between CD loader and navigation must be something like "EJECT CD, CD FOUND, READ SECTOR X...". I would like to use Raspberry and connect it to navigation, write software that communicates with navigation<->cd loader protocol. Pi would be accessing ISO file(s) on SD card and transparently behaves as CD loader.
Problem I have is that I cannot find data sheet (pinout at least) of my current loader, I have CDM-M3 4.3/7, it is Philips drive. All CDM-M3 seems similar by pinout, usually they differ only in mounting.
Does somebody know about these CD loaders? Or have access to datasheets? Or has any tip that would help me analysis of current protocol?
Unfortunatelly I don't own oscilloscope or logic analyzer. Any tips which gear to buy for this job? I have no idea how high the clock would be... I guess not so high, because it is older peace and I doubt it support some high data transfer rates..
Thank you for any comment on this...