NI_65XX_CHAN_TO_PORT
for (port = NI_65XX_CHAN_TO_PORT(base_chan); port < num_ports; port++) {
unsigned int port = base_port + NI_65XX_CHAN_TO_PORT(chan);
int last_port_offset = NI_65XX_CHAN_TO_PORT(s->n_chan - 1);
for (port_offset = NI_65XX_CHAN_TO_PORT(base_chan);