2 - fix handling of timeout (program timer of RC632)
5 - fix handling of TX or RX > 0x7f [buffer length in atmel chip?]
8 - test anticollision, resolve remaining bugs
11 - implement 'option 2' frame markers
12 - test anticollission (need multiple tags)
15 - implement anticollision
16 - implement all the rest
20 - implement pps for asymmetric (rx/tx) speeds
24 - add ifdhandler driver
27 - implementation of code for various passive tags