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SPI:
- use PDC DMA for SPI transfers
- use real SPI clock divisor (4.8MHz) rather than current 320kHz clock
RC632:
- Fix locking between 'atomic' ops like set/clear bit and RC632 IRQ
- Implement VFIFO handling
USB:
- don't busy-wait for EP2/EP3 transfers but rather use TX completion IRQ
- Implement VFIFO handling
- Add DFU descriptor to host
DFU:
- implement DFU protocol for bootloader flash partition
- add capability to copy and execute DFU from RAM
- Get rid of lots of constant values and replace them by proper defines
Generic:
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Way Later, for librfid:
- Implement parts (or all of) 14443 in firmware as alternative configuration
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