NRF52832 NFCT

[I6believe]

hello,we are developing NFC on NRF52832 recently,we want to use NFC as a label,T4T,but we have some problems as follows:

1、firstly,we want to develop NFCT by ourselves(not use LIB provided by SDK),but NFCT can only arrive IDLE state,it cannot achieve READY_A.

     according the NFC state diagram, ALL_REQ should be used for translation  from IDLE to READY_A.

     we have used M24SR02 to communicate with a android phone,M24SR02 should to send some special nums to  accomplish the translation to  READY_A/reading/writting.

     but we do not find some specific information about the translation in "NRF52832 product sepcification V1.4".

     if we do not use LIB,what should we do? 

2、we  attempt to use LIB,but there are some errors(using nfc_t4t_lib_keil.lib)

        we have included the nfc_t4t_lib.h,and added nfc_t4t_lib_keil.lib,but it appears errors such as ".\build\nrf52832_xxaa.axf:Error:L6218E:Undefined symbol hal_nfc_parameter_get(referred from nfc_t4t_lib.o)" , as follows:

we attempt to add hal_nfc_t4t.c and hal_nfc_t4t.h,but the errors do not disappear.what should we do?

 

that is all above,we need your help,thank you very much!

[Einar Thorsrud]

Hi,

Making your own NFC implementation will be very time consuming, so I strongly recommend that you use the library we provide in the SDK. I recommend you start looking at the NFC examples in the SDK.

Regarding the errors you get this is undefined symbols. The typical reason for this is either that you have not included the .c file where it is implemented, or that you have not enabled the relevant module in your projects sdk_config.h, so that it is removed by the preprocessor. You also have a few warnings for unused variables, which can be fixed by removing the variable declarations.

[I6believe]

thank you very much!

according your suggestion,i have added LIB to my project.

now,i want to know if there is an Android APP for NFCT testing?where can i download?

[Einar Thorsrud]

There are a number of NFC apps for Android. NFC Tools seems to be one of the more popular.

[I6believe]

thank you very much!

i still want to know the implementation of translation from IDLE to READY_A,can you tell me simply? 

thanks again!

[Einar Thorsrud]

The state transition from IDLE to READY_A happens when there is a ALL_REQ from the NFC reader (see state diagram). This is allready there in the NFC HW peripheral and is not something you have to (or can) implement.

[I6believe]

thank you.

recently,i have attempted to use nfc_uart example in NRF5_SDK_15.0.0_a53641a on PCA10040,but i found:

uart can receive data from computer,but when i put a breakpoint in

if(app_fifo_put(&m_nfc_tx_fifo,msg_chunk)  == NRF_SUCCESS),

it cannot stop,it means NFC cannot send data from uart,i donot know the reason.

in addition,uart  can receive data from NFC and display on the computer.

i need your help,thank you very much!

best regards.