Ok, in SmarTagNFC.c (and .h), you need to add this:
//EMG ported from ST25-DISCOVERY
NFCTAG_StatusTypeDef InitMailBoxMode( void )
{
NFCTAG_StatusTypeDef ret = NFCTAG_OK;
//Changing system registers from I2C and RF side both require a password
//default password is 00 00 00 00 00 00 00 00
ST25DV_PASSWD passwd;
passwd.MsbPasswd = 0;
passwd.LsbPasswd = 0;
/* Present password to open session */
ret = St25Dv_i2c_ExtDrv.PresentI2CPassword( passwd );
if ( ret != NFCTAG_OK) return ret; //password failed, can't go any further
//Configure GPO as RF_ACTIVITY interrupt
//Since this is a real-time system, we only want fresh data
//so we use RF_ACTIVITY instead of RF_GET_MSG_EN
//and accept data loss if sample time is too slow
//This exists but is not used by the driver
//ST25DV_GPO gpo;
//gpo.GPO_Enable = 1;
//gpo.GPO_RFActivity_en = 1;
//so we use hex
uint16_t gpo = 0x82;
ret = St25Dv_i2c_Drv.ConfigIT( gpo );
if ( ret != NFCTAG_OK) return ret; //password failed, can't go any further
//Should be A0 for RF_GET_MSG_EN
/* If not activated, activate Energy Harvesting */
ST25DV_EH_MODE_STATUS EH_mode = ST25DV_EH_ON_DEMAND;
St25Dv_i2c_ExtDrv.ReadEHMode( &EH_mode);
if( EH_mode != ST25DV_EH_ACTIVE_AFTER_BOOT )
{
/*
EH_MODE, default: 1 (meaning only energy harvesting upon demand)
0 (ST25DV_EH_ACTIVE_AFTER_BOOT): EH forced after boot
1 (ST25DV_EH_ON_DEMAND): EH on demand only
Set EH_MODE TO 0 to always start energy harvesting on boot (when a field is strong enough)
"Writing 0 in EH_MODE at any time after boot will automatically set EH_EN bit to 1,
and thus activate energy harvesting"
Note: This should only ever happen after initial flash of firmware
it can also be manually set from RF side
*/
EH_mode = ST25DV_EH_ACTIVE_AFTER_BOOT;
ret = St25Dv_i2c_ExtDrv.WriteEHMode( EH_mode );
}
if ( ret != NFCTAG_OK) return ret; //can't go any further
ST25DV_EN_STATUS MB_mode = ST25DV_DISABLE;
/* If not activated, activate Mailbox */
St25Dv_i2c_ExtDrv.ReadMBMode( &MB_mode);
if( MB_mode == ST25DV_DISABLE )
{
MB_mode = ST25DV_ENABLE;
ret =St25Dv_i2c_ExtDrv.WriteMBMode( MB_mode );
}
else
{
/* if already activated Clear MB content and flag */
ret =St25Dv_i2c_ExtDrv.ResetMBEN_Dyn( );
ret |=St25Dv_i2c_ExtDrv.SetMBEN_Dyn( );
}
/* Disable MB watchdog feature */
ret |= St25Dv_i2c_ExtDrv.WriteMBWDG( 1 ); //Watch dog duration = 2(MB_WDG-1)x30ms±6, 4 = ~240ms, 1 = 60ms
//ret |= St25Dv_i2c_ExtDrv.WriteMBWDG( 0 ); //Disable MB Watch Dog
/* present wrong password for closing the session */
passwd.MsbPasswd = ~passwd.MsbPasswd;
passwd.LsbPasswd = ~passwd.LsbPasswd;
St25Dv_i2c_ExtDrv.PresentI2CPassword( passwd );
return ret;
}
/**
* @brief DeInitializes the Mailbox mode, disables mailbox mode.
* @param None No parameters.
* @return NFCTAG_StatusTypeDef status.
*/
NFCTAG_StatusTypeDef DeInitMailBoxMode( void )
{
return St25Dv_i2c_ExtDrv.ResetMBEN_Dyn( );
}
