How to debug NFC APDUs

RE: How to debug NFC APDUs

Hung Bui — Fri, 10 Nov 2017 15:24:30 GMT

For TX, you can try adding log in hal_nfc_send(), the buffer is in p_data with data_length. But I would assume it is exactly what the application provides.

RE: How to debug NFC APDUs

Mik — Fri, 10 Nov 2017 14:00:17 GMT

Hi Hung Bui, thanks for the comment and it worked fine to get the rx_buffer. I've just added the NRF_LOG_HEXDUMP_DEBUG() at the suggested line and i can see the difference between the two readers. I would also like to see the tx, but there is no m_nfc_tx_buffer. What would you suggest?

RE: How to debug NFC APDUs

Hung Bui — Thu, 09 Nov 2017 13:37:26 GMT

Hi Mik,

You mean you want to see deeper log level like the "HAL_NFC:DEBUG: 02 00 A4 04 00 07 D2 76 00 00 85 01 01 " in the other case ?

You should first enable logging in the sdk_config file, remember to enable logging in both nRF_LOG and nRF_NFC. Change the default logging level to DEBUG instead of Info. Logging with RTT is suggested as I found that when I enable logging with UART i have problem communicate with NFC, could be some timing issue.

Then you can print out the RX data (m_nfc_rx_buffer) when you receive RX event (look for the place where we print "Rx fend" in hal_nfc_t4t.c