Hoi Yann,

I've been there so, this should help you.

The controller comes in two versions:

uart OR usb. Both is not possible.

When booting using uart. You need to reset the controller into bootmode by using the ISP pin.
Then use the FLIP software to upload your software.

Set / or reset the configuration bits to SKIP the bootloader, otherwise your code will never be executed.

When loading using the USB interface:

The flip software isn't enough ... You need to install the drivers that are available on the CD that comes from your component distributor. Also you may find the drivers (windows) on the ATMEL site.

Next all things should work exactly the same as in uart mode.

Things you should consider when using USB upload.

ALWAYS disconnect and reconnect the target board, cause windows NEEDS to see the bootloader ID for the FLIP software. This is often forgotten when developing your own firmware.

Once you got started, next is to find an OS-firmware for FAT support ... use search on this site..

Then write a driver for your DA, LCD, keypad.... and then you have a VERY expensive MP3 player!!!! Time does not get repayed for projects like this, unless you have big quantities ....

PITFALLS :

- LOW RAM .......
- LOW SPEED .....
- HARD TO GET ...
- USB SUPPORT ... if you buy the drivers :-)
- FAT SUPPORT ... if you buy the drivers :-)


+ POINTS :

- FUN PROJECTS .
- IDE INTERFACE .
- MMC INTERFACE .
- KEYPAD INTERFACE


SO have fun, but watch out when you start.
Do not underestimate some problems, like FAT, DECODE, etc ...