Zephyr NFC HCE

This is a PoC (Proof of Concept) for establishing communication between an STM32+PN532 NFC module and an Android phone.

✅ TODO

• Verify APDU responses

• Adding a ring buffer instead of managing a raw buffer and its rx length

• Normalize all functions to fail fast ie: check failed condition first and exit early

• Normalize all functions and variables naming

• Normalize comments + doxygen

• Increase UART baudrate to 921600 in initialization, right after SAMConfig (921600 worked only on native_sim)

• Organize the code in separate pn532.c and pn532.h files with clean APIs

• Start to work on structuring those files as a zephyr out of tree driver

• Remove unnecessary duplicated doxygen comments in the driver

• Clarify API namings for the driver (public vs private)

• Simplify driver CI and make it more lightweight

• Validate driver unit tests and samples

• Encapsulate the waiting for response after each command into a function (eg: pn532_read_response)

• Start work on the application and the challenge response protocol using the APDUs

• Fix high baudrate problem on STM32 (although works fine on native_sim)