NI_65XX_PORT_TO_CHAN
if (base_chan >= NI_65XX_PORT_TO_CHAN(num_ports))
int bitshift = (int)(NI_65XX_PORT_TO_CHAN(port) - base_chan);
int base_port_channel = NI_65XX_PORT_TO_CHAN(port_offset);
s->n_chan = NI_65XX_PORT_TO_CHAN(board->num_di_ports);
s->n_chan = NI_65XX_PORT_TO_CHAN(board->num_do_ports);
s->n_chan = NI_65XX_PORT_TO_CHAN(board->num_dio_ports);