Enter secure mode on a Tag using a St25R3916 on a X Nucleo NFC08A1

[CT-55555]

Hello everyone, 

for my project I need to enter the secure mode on a em4233 Glastag. I also use X-Cube-NFC6. The rfal-librarys only support tags from STM. I do not know how to send the command to the Tag can some explain or provide a example. 

Thanks

 

[Brian TIDAL]

Hi,

I would suggest to use rfalNfcvPollerTransceiveReq. You will find an example in rfalST25xVPollerPresentPassword that build the ST Custom command Present Password (in file rfal_st25xv.c). This should be very close to the EM Login command. 

Something like this should do the job:

#define RFAL_NFCV_CMD_EM_LOGIN 0xE4 /*!< EM Login command */
#define RFAL_NFCV_EM_IC_MFG_CODE 0x16 /*!< EM IC Mfg code (used for custom commands) */
#define RFAL_NFCV_CMD_EM_LOGIN_PWD_LEN 4 /*!< EM Login password len */ 
ReturnCode rfalST25xVPollerEMLogin( uint8_t flags, const uint8_t* uid, const uint8_t *pwd)
{
 uint16_t rcvLen;
 rfalNfcvGenericRes res;
 
 return rfalNfcvPollerTransceiveReq( RFAL_NFCV_CMD_EM_LOGIN, flags, RFAL_NFCV_EM_IC_MFG_CODE, uid, pwd, RFAL_NFCV_CMD_EM_LOGIN_PWD_LEN, (uint8_t*)&res, sizeof(rfalNfcvGenericRes), &rcvLen ); 
}

 

Rgds

BT

[CT-55555]

Hi, 

first of all thank you so much. I tried to understand the function.

If the request format of a cmd looks different, can the function rfalNfcvPollerTransceiveReq() still be used? For example, how about in this case.

The structure of the function is similar to before, but I don't quite understand how to pass the bits to the Page Nb and Protect statuses. Because in the function: rfalNfcvPollerTransceiveReq() there is only one variable for the data.

 

 

 

 

[Brian TIDAL]

Hi,

this is quite simple. Just create a new function with those 2 parameters (Page and Status) and encode them as a single array before calling rfalNfcvPollerTransceiveReq. This should give something like this.

#define RFAL_NFCV_CMD_EM_PROTECTPAGE 0xzz /*!< EM Protect Page command */
#define RFAL_NFCV_CMD_EM_PROTECTPAGE_DATA_LEN 2 /*!< EM Protect Page data len */ 
ReturnCode rfalST25xVPollerEMProtectPage( uint8_t flags, const uint8_t* uid, const uint8_t pageNb, const uint8_t protectStatus)
{
 uint16_t rcvLen;
 rfalNfcvGenericRes res;
 uint8_t data[RFAL_NFCV_CMD_EM_PROTECTPAGE_DATA_LEN];
 
 data[0] = pageNb;
 data[1] = protectStatus;
 
 return rfalNfcvPollerTransceiveReq( RFAL_NFCV_CMD_EM_LOGIN, flags, RFAL_NFCV_EM_IC_MFG_CODE, uid, data, RFAL_NFCV_CMD_EM_PROTECTPAGE_DATA_LEN, (uint8_t*)&res, sizeof(rfalNfcvGenericRes), &rcvLen ); 
}

 

If you need to use more custom commands, make sure to create related encoding functions.

Rgds

BT

[CT-55555]

Hi, 

I've added the features to the tag. However, it is not possible to protect the read or write process yet. 

Rgds

[Brian TIDAL]

Hi

I afraid I cannot help so much on custom features of tag from competitors. I would suggest to post on their community or to contact their support.

Rgds

BT