... comedi_dio_config -- change input/output properties of channel . ... int comedi_dio_config (comedi_t * device, unsigned int subdevice, unsigned int channel, unsigned int direction); . The function comedi_dio_config() configures individual channels in a digital I/O subdevice to be either input or output, depending on the value of parameter direction. ... Depending on the capabilities of the hardware device, multiple channels may be grouped together to determine direction. ...