the constant ND_INTERNAL_80_MHZ is not defined in the header file nidaqcns.h for PCI6602. What is the corresponding value (or can we use 80Mhz with PCI6602)?
Alain: To use the 80MHz with PCI-6602, you need to call GPCTR_Change_parameter and ND_INTERNAL_MAX_TIMEASE for paramID=Source. You will find this documentation under GPCTR_Change_Parameter function in NIDAQ Function Reference Manual.
I had the same problem and tried the same thing as you mention here, but it doesn't work. The clock remains at 20MHZ ... I don't know how to solve this one.
