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I have been working for some time on a portable MP3 player and came by Rockbox and your player port. I have since switched my efforts to supporting your project instead of working on my own for now.
I am a couple of days away from sending off for a prototype based off your existing specs plus a few more for future incorporation.
Looking at your daughterboard for the Olimex board, I cannot determine your switch needs and would like to discuss your design plans for user input so I can layout the board appropriately.
Also, since you are using the Olimex board which is based on the Atmel evaluation board, there are a few questions that I need answered based on your current port. Does your bootloader use external dataflash, nandflash or just the internal dataflash?
Are you using or planning on using the EEPROM to persist settings?
Do you see a need for a serial interface or is the USB interface sufficient?
Do you see a need for an external RTC or use the processor to keep date/time?
It has a open source Atmel SAM7X processor, ARM7, 32-bit, 256K Flash, 64K SRAM, up to 55MHz and 48 MIPS. Ethernet, 256K EEPROM, MAKE Controller Kit.
I had written a couple of weeks ago regarding an implementation of the Rockbox Player (Little) and am very close to having a final design. I intend to offer it for sale to those looking for one to play with. I should have the full prototype completed in the next couple of weeks and if all goes well, I will go into production shortly after.Casainho, I would like to send you one of the prototypes when I get to that point so you can continue your development around my design. We can talk about this in the near future.Do you have any idea how many people are interested in getting one of the players? They will be cheaper if I can make many rather than just a few. I also don't want to spend money when nobody is buying.
Ouch!!!!! I guess I deserve some of that, but not all of it.I have not contributed before and don't know all the protocols, so be gentle.In looking back at my original post, I see that I did not use much detail, as I assumed the basic design features were set: [...], display, [...]
The current design has a wheel like the sansa e200. What are your thoughts on that? I am not sure at this point. I am looking at adding either the Si4720 or Si4721 for FM support both receive and transmit. Thoughts?https://www.silabs.com/products/audiovideo/fmtransceivers/Pages/default.aspxThe one question remaining from earlier is related to user interface. What are the switches purpose on your expansion board? Up/Down, Play/Stop? Their placement depends on their purpose.Future additions I am thinking about are GPS, Bluetooth(A2DP) and a larger display.
In looking back at my original post, I see that I did not use much detail, as I assumed the basic design features were set: MCU, memory, display, codec, etc. I am doing nothing fancy at this point. At this time, the design is the same hardware you are working with today on the Olimex(Atmel eval kit) board with the addition of your expansion board and LED display. I am simply repackaging it for a handheld player.
I question the need for the DATAFLASH. It seems you can use the 4K of internal ROM on the AT91 for the bootloader rather than external ROM. I will look further into this. I am not designing for any nandflash unless someone sees a need.
There will be no ethernet port or serial ports. One mini USB port and micro-SD are in in the current design.
The current design has a wheel like the sansa e200. What are your thoughts on that? I am not sure at this point.
I am looking at adding either the Si4720 or Si4721 for FM support both receive and transmit. Thoughts?https://www.silabs.com/products/audiovideo/fmtransceivers/Pages/default.aspx
The one question remaining from earlier is related to user interface. What are the switches purpose on your expansion board? Up/Down, Play/Stop? Their placement depends on their purpose.
Future additions I am thinking about are GPS, Bluetooth(A2DP) and a larger display.
If there is something you would like added, let me know.
I'd just like to clarify that this project is really independent of Rockbox, and that any opinions in this post are those of the individuals posting. While he may think the screen is quite good, many of us developers on Rockbox disagree, and I personally am quite certain having such a small screen will limit severely who will be willing to buy such a player.
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