Comedi Documentation . ... Next . comedi_sv_init -- slowly-varying inputs . ... int comedi_sv_init (comedi_sv_t * sv, comedi_t * device, unsigned int subdevice, unsigned int channel); . The function comedi_sv_init() initializes the slow varying Comedi structure sv to use the device device, the analog input subdevice subdevice, and the channel channel. The slow varying Comedi structure is used by comedi_sv_measure() to accurately measure an analog input by averaging over many samples. ...