comedi_dio_read - read single bit from digital channel
int comedi_dio_read (comedi_t * device, unsigned int subdevice,
unsigned int channel, unsigned int * bit);
The function reads the channel channel belonging to the subdevice
subdevice of device device. The data value that is read is stored in
the location pointed to by bit. This function is equivalent to
comedi_data_read(device,subdevice,channel,0,0,bit). This function does
not require a digital subdevice or a subdevice with a maximum data
value of 1 to work properly.
Return values and errors are the same as comedi_data_read().
28 October 2007