How to use nfc_initiator_select_tag to wait for specific timeout

I'm using a while loop with a timeout in the exit guard (DCO_INFINITE_SELECT is false).

The body of the loop is something similar to:

time_t timeout = ...;
time_t start = now();
while (now() - start < timeout)
{
    if (nfc_select_tag(...))
        return true;
}

return false;

There are possible registers/parameters to configure to let the PN53X chip poll for n-times during a .._select_tag()
Plus there is a way to set the time-out to a value related to milliseconds. If you both think this is a useful feature, we could think of a way to implement this into the nfc_configuration()

At the moment it takes a bool

bool nfc_configure(dev_info* pdi, const dev_config_option dco, const bool bEnable);

We could let it take a value

bool nfc_configure(dev_info* pdi, const dev_config_option dco, const dev_config_value dcv);

byte or longer?

typedef byte_t dev_config_value
typedef uint64_t dev_config_value

Thanks for the help!

hmm, I don't think there are many options that require more than a byte_t of value. So uint64_t or a buffer may would be just to much, right?

Probably option 'c' would be the best then, since the PN53x chip gives the following options for "easy" time-out configuration (separately configurable for both, anticollision (=_select_tag()) and transmission (=transceive())

Byte Value (n)  Timeout Value 
0x00 no timeout 
0x01 100 µs 
0x02 200 µs 
0x03 400 µs 
0x04 800 µs 
0x05 1.6 ms 
0x06 3.2 ms 
0x07 6.4 ms 
0x08 12.8 ms 
0x09 25.6 ms 
0x0A 51.2 ms 
0x0B 102.4 ms 
0x0C 204.8 ms 
0x0D 409.6 ms 
0x0E 819.2 ms 
0x0F 1.64 sec 
0x10 3.28 sec 

A descent typedef for the options sounds reasonable. A incorrect configuration option would most likely fail (rejected by the PN53x chip).