comedi_data_read_hint — tell driver which channel/range/aref you are going to read from next
#include <comedilib.h>
int comedi_data_read_hint( | comedi_t * device, |
| unsigned int subdevice, | |
| unsigned int channel, | |
| unsigned int range, | |
unsigned int aref); |
Used to prepare an analog input for a subsequent call to
comedi_data_read.
It is not necessary to use this
function, but it can be useful for eliminating inaccuracies
caused by insufficient settling times when switching the
channel
or gain on an analog input. This function sets an analog input
to the channel, range, and aref specified but does not
perform an actual analog to digital conversion.
Alternatively, one can simply use
comedi_data_read_delayed,
which sets up the
input, pauses to allow settling, then performs a conversion.