In the states RFAL_LM_STATE_POWER_OFF or in RFAL_LM_STATE_IDLE ( function rfalRunListenModeWorker File rfal_rfst25r3916 ) the flags ST25R3916_REG_OP_CONTROL_en_fd_auto_efd are reset during detetcting a smartphone.
These bits are set only during initalisation. but why are they reset during working? ? ?
A workaround works better but not sufficient, sometimes a smartphone is detected. The workaround sets the ST25R3916_REG_OP_CONTROL_en_fd_auto_efd bits in both states (see code below).
The hardware is the discovery antenna board with st2533916 and via spi connected to our µc STm32L151.
The hardware antenna works with discovery mainboard fine.
Additional we implement in depency of the field on , to switch from power off to idle and reverse. (seee below)
On the saleae.com you can download a software, to analyse the logic spi data attached.
Ther are two records wih detecting a smartphone. The first tooks a long time to get the smartphone. the sceond ist ok.
switch( gRFAL.Lm.state )
{
/*******************************************************************************/
case RFAL_LM_STATE_POWER_OFF:
irqs = st25r3916GetInterrupt( ( ST25R3916_IRQ_MASK_EON ) );
if( irqs == ST25R3916_IRQ_MASK_NONE )
{
st25r3916ReadRegister( ST25R3916_REG_OP_CONTROL, &OP_control );
if( ( (OP_control & ST25R3916_REG_OP_CONTROL_en_fd_auto_efd)==0) )
{
wobinich = 0;
OP_control = (ST25R3916_REG_OP_CONTROL_en|ST25R3916_REG_OP_CONTROL_rx_en|ST25R3916_REG_OP_CONTROL_en_fd_auto_efd);
st25r3916WriteRegister( ST25R3916_REG_OP_CONTROL, OP_control );
st25r3916ReadRegister( ST25R3916_REG_OP_CONTROL, &OP_control );
}
if( rfalIsExtFieldOn() )
{
if( pwr_of_cnt > 100 )
{
rfalListenSetState( RFAL_LM_STATE_IDLE );
}
pwr_of_cnt++;
}
else
{
pwr_of_cnt=0;
}
break; /* No interrupt to process */
}
if( (irqs & ST25R3916_IRQ_MASK_EON) != 0U )
{
rfalListenSetState( RFAL_LM_STATE_IDLE );
}
else
{
break;
}
/* fall through */
/*******************************************************************************/
case RFAL_LM_STATE_IDLE: /* PRQA S 2003 # MISRA 16.3 - Intentional fall through */
irqs = st25r3916GetInterrupt( ( ST25R3916_IRQ_MASK_NFCT | ST25R3916_IRQ_MASK_WU_F | ST25R3916_IRQ_MASK_RXE | ST25R3916_IRQ_MASK_EOF | ST25R3916_IRQ_MASK_RXE_PTA ) );
// st25r3916ReadRegister( ST25R3916_REG_OP_CONTROL, &OP_control );
if( irqs == ST25R3916_IRQ_MASK_NONE )
{
if( ( (OP_control & ST25R3916_REG_OP_CONTROL_en_fd_auto_efd)==0) )
{
wobinich = 0;
// OP_control |= ST25R3916_REG_OP_CONTROL_en_fd_auto_efd;
OP_control = (ST25R3916_REG_OP_CONTROL_en|ST25R3916_REG_OP_CONTROL_rx_en|ST25R3916_REG_OP_CONTROL_en_fd_auto_efd);
st25r3916WriteRegister( ST25R3916_REG_OP_CONTROL, OP_control );
st25r3916ReadRegister( ST25R3916_REG_OP_CONTROL, &OP_control );
}
if( !rfalIsExtFieldOn() )
{
if( idle_cnt > 100 )
{
rfalListenSetState( RFAL_LM_STATE_POWER_OFF );
}
idle_cnt++;
}
else
{
idle_cnt=0;
}
break; /* No interrupt to process */
}
if( (irqs & ST25R3916_IRQ_MASK_NFCT) != 0U )
{
