ISO-14443 support #32
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Added ISO-14443-A Scaffold peripheral and associated NFC daughterboard based on TRF7970A chip.
Added hints in the ISO-14443 data register to help software know how many bits have been received. Added rx_busy flag in status register to allow waiting for the reception peripheral. Reception method in the API now returns all received bytes, no need to indicate how much to receive anymore.
ISO-14443 transmitter can now resynchronize on the 13.56 MHz carrier clock to reduce jitter.
Using only one state machine for both transmission and reception. Removed synchronization of reception on edges, now using expected timings for sampling. Added reception timeout mechanism. Merged status and control registers.
Reworked how reception is done: we now have a demodulation stage whose output is used for synchronization and decoding. This implementation is much more reliable and works when response takes time to start. As we are not sampling the subcarrier anymore, this is more tolerant to jitter.
trigger signal was not declared in possible module inputs.
Tweaks to slightly reduce ISO-14443 Scaffold response reading time.
Allow chosing the Platform socket for the NFC daughterboard.
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New NFC daughterboard and Scaffold implementation for ISO-14443A support.