Rockbox General > Rockbox General Discussion
work on best low cost mp3 player for rockbox
wodz:
Is atj213x still in stock? It is possible target for rockbox (I made some work for this SoC in this direction). Nano-d has too little ram (if I read the informations provided correctly). As pamaury stated earlier, 4MB of ram is about the smallest feasible amount unless you can memory map flash and run code from there which saves you something like ~300-400kB max.
Ingenic 4760 is used in Fiio X1 so I assume it is readily available.
hunterleo:
--- Quote from: wodz on October 30, 2015, 03:54:21 AM ---Is atj213x still in stock? It is possible target for rockbox (I made some work for this SoC in this direction). Nano-d has too little ram (if I read the informations provided correctly). As pamaury stated earlier, 4MB of ram is about the smallest feasible amount unless you can memory map flash and run code from there which saves you something like ~300-400kB max.
Ingenic 4760 is used in Fiio X1 so I assume it is readily available.
--- End quote ---
Yes, ATJ2137 still is in production. Is it a good choice for rockbox?
Ingenic 4760 used BGA packages which is not good for mass production. (easy to get loose)
ZincAlloy:
--- Quote from: hunterleo on October 29, 2015, 11:45:18 PM ---Thank you for the advice! Although we are aiming the mass market, but we don't use cheap material. The buttons were imported in Japan. Check out our new model. AGPTEK B03 has two more buttons to A02.
--- End quote ---
Nice! I'm currently using a Sansa Clip Zip, which is my only experience with a low cost player. The buttons seem to be one of its weaker points. The one I'm pressing the most doesn't "click" anymore like it's supposed to. Still works, though. :) It's other weakness is the display. It just isn't bright enough for outside use.
--- Quote from: hunterleo on October 29, 2015, 11:35:53 PM ---Thanks a lots. Those suitable chips are quite old.
--- End quote ---
The good thing about those old chips is that Rockbox is already running on them, so setting up a port for your new player would need less effort.
pamaury:
If BGA is a no-no, I guess this rules out quite a number of chips, on the other hand, there probably are plenty of chips we don't know about. Doing a new port isn't really an obstacle here, as long as the soc has documentation. So I guess the real requirements boils down to ARM/MIPS and can be interfaced with at least 4MB of RAM. If it helps, Rockbox does not even need a MMU.
I think NXP might have such chips (the LPC series), as well as ST Micro (the higher-end STM32 have a external memory interface I believe). Atmel has such chips, they definitely do have BGA one but not sure for QFP. Cirrus Logic have some of these (like the EP9302 but possibly not powerful enough/suitable for MP3), might be worth a look. Freescale i.MX233 exists in QFP package, and possibly more recent Freescale chips might do. On the high-end of the spectrum, Allwiner has some QFP chips but those are probably beasts and are very big anyway. TI has tons of chips (OMAP, Sitara) but I can't really tell right-away from the website if they have QFP versions. Marvell used to do interesting chips, not sure what they are doing now ;)
EDIT: I will fill this list when I find parts
* NXP: LPC177x/178x/407x/408x/2400/3100/3200 and virtually anything with an EMC, usually NXP makes all chips in TQFP
saratoga:
Whats wrong with BGA? Too expensive for you to assemble? Seems widely used for low cost players.
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