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This LCD was mentioned before. You have to buy the carrier board becausesoldering to the connector by itself is very hard. So the total price is just under $40.
Quote from: casainhoI am still waiting for an answer from http://ic-board.de/, I will just for more 3 days, after that I hope to contact Olimex and ask If they can/want to help in defining, designing, build and sell It for us, thinking in that they can upgrade their MOD-MP3 MP3 PLAYER MODULE - http://www.olimex.com/dev/mod-mp3.htmlif some company is gonna do everything, then what are we going to do?
I am still waiting for an answer from http://ic-board.de/, I will just for more 3 days, after that I hope to contact Olimex and ask If they can/want to help in defining, designing, build and sell It for us, thinking in that they can upgrade their MOD-MP3 MP3 PLAYER MODULE - http://www.olimex.com/dev/mod-mp3.html
Quote from: casainhoHardware blocs of the RockboxPlayer-just 16kB flash will not be sufficient. need to have at least 8MB flash on the proto boards. this can reduce later, once we know the firmware size.-4MB RAM may be very conservative to start with. protos can have 16/32MB RAM. we can chip off the excess later.-battery, charger, power supply stage? this is a very important and challenging stage to design.-memmory card -> memory card . we can finalize an SD card since it is compact and cheap.-microphone? sound recording h/w can be added with no extra cost. the codec chip (tlv320aic23b) already supports it.
Hardware blocs of the RockboxPlayer
this processor (Samsung S3C2410) has heavy power consumption and there will be problems as far as availability and support is concerned.the processor is suitable for a feature rich phone, but may be an over kill for a decent RB player.
You can have a look on this project http://www.aesop-embedded.org/download.htmlIt doesn't seem to be active but the drawings are complete.It is almost the Toshiba gigabeat F.Why don't use the gigabeat F as a base, you just have to find a lcd, everything else is documented androckbox is already running on it. Taking the project above and modifying the sound part you have a gigabeat
You can have a look on this project http://www.aesop-embedded.org/download.htmlIt doesn't seem to be active but the drawings are complete.It is almost the Toshiba gigabeat F.
Use NiMH AA batteries because they are cheap, removable, easy to find for buy on any street, also chargers for that batteries. To be a simple and cheap, there will no batteries charger in the player.
Why not try to find an ARM9 from Atmel? Looks like they have low power consumption and there is a lot of information from Atmel. Even two community site backed up by Atmel: http://www.at91.com and http://www.linux4sam.orgDev board - http://www.kwikbyte.com/KB9202.html
i suppose it has all the documentation about the samsung 2440 processor that was almost impossible to find through google.this solves one problem about the S3C2440. what about availability and pricing of this processor? It is a BGA package.
BatteriesQuote from: casainhoUse NiMH AA batteries because they are cheap, removable, easy to find for buy on any street, also chargers for that batteries. To be a simple and cheap, there will no batteries charger in the player.i agree with you casainho. but i'm a bit worried about battery life if we use 1 NiMH cell and ARM9 processor with 3.3V SDRAM and LCD backlight. the player may not run for long.Li-Ion batteries are pretty light weight and cheap these days. and since we have the USB port, charging from a USB port is pretty handy. you can find a USB port everywhere these days, on TV's, in flights, etc.who would want to carry a bulky NiMH charger along with a 2 sets of NiMH batteries?There are 1 chip battery charger chips available and it is not very complex. i have some experience with batteries and power and can support in this area.designing with LiIon is easier because it has a voltage range of 3.2V to 4.2V and we need is a buck regulator for 3.3V & 1.8V supplyIf we go for 1 or 2 Cell NiMH, we will need a buck-boost regulator. (boost for 3.3V, buck-boost for 1.8V).buck regulators are relatively simple and easy to design when compared with buck-boost.
MicrophoneThere is hardly any hardware complexity to add sound recording. only 3 components required (mic, bias resistor and decoupling cap). most of the work needs to be done in software. ;
AT91 atmel processorQuote from: casainhoWhy not try to find an ARM9 from Atmel? Looks like they have low power consumption and there is a lot of information from Atmel. Even two community site backed up by Atmel: http://www.at91.com and http://www.linux4sam.orgDev board - http://www.kwikbyte.com/KB9202.htmli personally like the atmel processor due to good support and documentation. this processor will also have long term availability. the only drawback is that there is no integrated LCD controller. i think for RB v1 we can go for the AT91 processor and use the serial based LCD module.there is a AT91SAM9261 processor which has integrated LCD controller but it comes in a BGA package http://www.atmel.com/dyn/products/product_card.asp?part_id=3638it is available for $22eval boards are expensive though.i think this AT91SAM9261 is comparable to the samsung S3C2440.
So, is this board ok? - Dev board - http://www.kwikbyte.com/KB9202.html
QuoteSo, is this board ok? - Dev board - http://www.kwikbyte.com/KB9202.htmlAt first glance it looks ok, ($200) but will need LCD, A/D-analog, and kb added.If the jtag port supports "wiggler" hw, then jtag will be cheap under linux/gdb.
I also would like to have something simple, cheap, low energy - but I want ALL audio files to be played on there, so, ARM9!
So, is this board ok? - Dev board - http://www.kwikbyte.com/KB9202.htmlI found one that have all we need(less the DAC) for $225 - highlights:# 180 MHz, 200 MIPS ARM9 highly-integrated core - Atmel AT91RM9200....
That MCU don't have a A/D :-( - It looks like we can't find an ideal SOC...
for LCD we can use the serial (SPI based) LCD.http://www.sparkfun.com/commerce/product_info.php?products_id=569
Hi guys,I am following this discussion with great interest. But one question:Are you aware that the ARM9 from atmel as well as the olimex board do have USB full speed (12Mbits) only?Chris
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