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As of 2/16/12 the usb_cdc_acm.c library cannot compile on Linux Mint 12 64-bit with SDCC #5416 (Feb 3 2010) (that's all 'sdcc --version' gives me).
There are multiple structs defined in the usb.h library header in the form:

typedef struct STRUCT_NAME
{
  ...
} STRUCT_NAME;

usb_cdc_acm.c attempts to use the types 'struct STRUCT_NAME', when it should just use 'STRUCT_NAME'. It compiles without trouble after changing all occurrences.
It may be that it would compile fine with a current version of SDCC (I haven't tried yet), but the version I have is the one currently in the Apt repositories, so I figure it's the version that most Mint/Ubuntu users would have.

This line appears twice in radio_mac.c:

DMAARM |= (1<<DMA_CHANNEL_RADIO);

Someone has reported to us that this gets compiled as a read-write-modify operation and it results in other DMA transfers being armed by mistake. We should look into it and fix those lines if needed.

Hey !
I would like to make the Wixel recognised as midi instrument, any suggestion ?
Thanks ;)