... What is a "device driver"? ... A general DAQ device driver package. ... Overview of Comedi. ... comedi_get_n_channels -- number of subdevice channels . ... comedi_data_read -- read single sample from channel . comedi_data_write -- write single sample to channel . ... Each sub-device has parameters for: the number of channels, and the type of the channels. - device: a set of sub-devices that are physically implemented on the same interface card; in other words, the interface card itself. ...