Rockbox Development > New Ports
Rockbox Player - Project to design and build a Free/Open hardware audio player
spark:
Welcome Matt. Good to have you with us.
Could you post more info about your oled clock project? You seem to have PCB design experience. which tools do you use?
--- Quote from: casainho ---However, I changed a bit my ideas now :-) - we don't loose nothing in have it designed by ourselfs, specially If we have resources to do that, If you like and want to do that, go ahead :-)
--- End quote ---
sure, i'll start something on it. I'm new to KiCad, so i will have to do some learning on that first. We also have Matt now with us. ;)
casainho:
--- Quote from: spark on January 30, 2008, 04:02:46 AM ---
--- Quote from: casainho ---However, I changed a bit my ideas now :-) - we don't loose nothing in have it designed by ourselfs, specially If we have resources to do that, If you like and want to do that, go ahead :-)
--- End quote ---
sure, i'll start something on it. I'm new to KiCad, so i will have to do some learning on that first. We also have Matt now with us. ;)
--- End quote ---
About Matt, I had chat with him yesterday. Matt told me that he must have the board designed and produced in 1.5 months!! He will be able to assembly a few for developers, we need to send him money for the components and board. He estimates a price of no more than 100 €.
So he will just make the board for his project in school and after we can continue with the software porting.
Since we will need to spend about 200 € for the dev boad from Olimex + LCD, etc... I think we can try the board from Matt. Spark, I apologize for changed my ideas, since you suggested the same as Matt! I think it shows my inexperience :-)
What do guys think about this? about shifting from Olimex dev board to Matt board?
We can help Matt, It will not be Matt board, instead, our board :-)
Written by Matt on http://www.rockbox.org/twiki/bin/view/Main/RockboxPlayerPrototypeB
components and operation
* atmel arm9 (at91sam9260, 208 pin qfp, ~$20) microcontroller
* organic led display (124x128, 18 bit color, 30 pin connector, $37)
* 2 sd/sdhc card slots
* lithium ion variant battery (charges via usb)
* spi flash (dataflash, 8 pin soic)
* sdram (32 bit wide)
* stereo DAC (twi or spi or ssc/i2s)
Very nice the at91sam9260, we have already a lot of information about it.
The organic led display, Matt wrote: The choice of an oled display was because it was fairly low-cost ($37 in single quantities), easy to interface to and is lower power than an lcd in the case that only a few of the pixels are on (because there’s no backlight on an oled display). --> very nice the low power and the price for that technology will drop, IMO.
Stereo DAC? can it be the same TLV320AIC23?
Rockbox will be stored in spi flash and be copied to ram upon bootup. This means that it will be necessary a larger SDRAM value?
to get truely low power when the device is in pause mode, it needs mobile sdram which is only available in BGA packages (tell me if I'm wrong about this!) --> I went to IRC for asking this question, no one could tell me about mobile sdram.
I found the AT45DB321D-SU - 32M bit / 4 MByte, 2.7-Volt Only Serial Interface Flash, SOIC.
Atmel product page with datahseet and application notes: http://www.atmel.com/dyn/products/product_card.asp?part_id=3818
cost 4,54 € in Farnell: http://uk.farnell.com/jsp/Semiconductors/Memory/ATMEL/AT45DB321D-SU/displayProduct.jsp?sku=1455042&_requestid=63444
And on IRC chat:
- 32mbit/4mb should be enough
- rockbox core is muuuuch smaller than that
- would even have room for some plugins
spark:
--- Quote from: casainho ---About Matt, I had chat with him yesterday. Matt told me that he must have the board designed and produced in 1.5 months!! He will be able to assembly a few for developers, we need to send him money for the components and board. He estimates a price of no more than 100 €.
So he will just make the board for his project in school and after we can continue with the software porting.
--- End quote ---
not a bad idea. Matt, please start work on the wiki as soon as possible so that we can work together to build the schematics.
--- Quote from: casainho ---Spark, I apologize for changed my ideas, since you suggested the same as Matt! I think it shows my inexperience :-)
--- End quote ---
you don't need to. it is not inexperience. it is difference in needs ;).
oled display
can we have datasheets of the oled display? how many colours does it support?
spi flash or NAND flash
--- Quote from: casainho ---Rockbox will be stored in spi flash and be copied to ram upon bootup. This means that it will be necessary a larger SDRAM value?
--- End quote ---
Why not NAND flash? We can have a 8Gbit (1GByte) NAND flash for $16. This can serve as firmware space as well as media storage.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=557-1373-1-ND
Linux can also be used. you can literally swim inside here. :)
It can also save you from buying an SD card.
Mobile SDRAM
Yes, unfortunately these low voltage (1.8V) SDRAMs are only available in BGA package. So we have to stick to 3.3V SDRAMs. :(
casainho:
--- Quote from: spark on January 30, 2008, 09:23:54 AM ---oled display
can we have datasheets of the oled display? how many colours does it support?
--- End quote ---
I am almost sure that is this this display, from SparkFun - there is also listed on that page the example project of Matt: http://www.sparkfun.com/commerce/product_info.php?products_id=712
--- Quote from: spark on January 30, 2008, 09:23:54 AM ---spi flash or NAND flash
--- Quote from: casainho ---Rockbox will be stored in spi flash and be copied to ram upon bootup. This means that it will be necessary a larger SDRAM value?
--- End quote ---
Why not NAND flash? We can have a 8Gbit (1GByte) NAND flash for $16. This can serve as firmware space as well as media storage.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=557-1373-1-ND
Linux can also be used. you can literally swim inside here. :)
It can also save you from buying an SD card.
--- End quote ---
I think Matt did choose that because of SOIC package, to be easier to solder.
scharkalvin:
I like the look of that oled display. Matts clock looks real good on it.
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