pwm

[tiannjc]

HI!I have a PCI-6221 Daq card,now I need to generate two pulse trains(about 40k) on DO,moreover the phase bewteen the trains should be adjustable ,how can I do it ?Thanks!

[BeCeGa]

Hi tiannjc you can make the PWM using the counter on your board. on the next page you can find a small tutorial:

http://zone.ni.com/devzone/cda/tut/p/id/2991

For the phase shifting  one way you could do it is by changing the frequency of one of the PWM for a little while till you get the phase shift and return it to its normal frequency.

Hope this helps