Hello CyrilBZH,
I would start from the Python "nfcloader" application in the "tools" folder of the NHS3152 SDK.
This application is designed to work with a USB connected NFC reader but can be easily extended to other readers.
1) If you can run the CCID demo on the PN7642, I expect you can directly interface with it using the --pyscard option on nfcloader.py (*UNTESTED*, I don't have the PN7642 devkit available)
2) If you control the PN7642 using Python in some other way, you can extend nfcloader.py to use that interface. The connection between the programming logic and the actual reader is done via the "TagHandler" class, the definition is in "modules/taghandler.py".
Besides the constructor which stores the connection info, only 2 functions need to be provided namely read and write an ndef message
def read(self):
"""
This function reads the first record in the tag (NDEF message)
@return string containing the record payload
"""
def write(self, packet):
"""
This function writes a single MimeType record NDEF message including the packet
@param packet : The packet to be send to the tag
"""
Two subclasses of TagHandler are included and can serve as example:
- modules/taghandler_nfc.py: high level, uses read and write ndef message
- moduls/taghandler_pyscard.py: low level, does the whole ndef messaging itself only using page read and write commands to the tag.
Depending on the level of the PN7642 api, select the best matching subclass as a starting point for your implementation.
Another option is to translate the Python code in "modules/protocol.py" to C and run it on the PN7642 devkit or on your NFC reader host.
Kind regards,
Patrick
Hello CyrilBZH,
I would start from the Python "nfcloader" application in the "tools" folder of the NHS3152 SDK.
This application is designed to work with a USB connected NFC reader but can be easily extended to other readers.
1) If you can run the CCID demo on the PN7642, I expect you can directly interface with it using the --pyscard option on nfcloader.py (*UNTESTED*, I don't have the PN7642 devkit available)
2) If you control the PN7642 using Python in some other way, you can extend nfcloader.py to use that interface. The connection between the programming logic and the actual reader is done via the "TagHandler" class, the definition is in "modules/taghandler.py".
Besides the constructor which stores the connection info, only 2 functions need to be provided namely read and write an ndef message
def read(self):
"""
This function reads the first record in the tag (NDEF message)
@return string containing the record payload
"""
def write(self, packet):
"""
This function writes a single MimeType record NDEF message including the packet
@param packet : The packet to be send to the tag
"""
Two subclasses of TagHandler are included and can serve as example:
- modules/taghandler_nfc.py: high level, uses read and write ndef message
- moduls/taghandler_pyscard.py: low level, does the whole ndef messaging itself only using page read and write commands to the tag.
Depending on the level of the PN7642 api, select the best matching subclass as a starting point for your implementation.
Another option is to translate the Python code in "modules/protocol.py" to C and run it on the PN7642 devkit or on your NFC reader host.
Kind regards,
Patrick
