Hi, i have an application that need's voltage measurements and a PWM input, i'm using a cRIO-9111 and the modules are the NI-9201 and the NI-9474 to do that. I'm already capable of doing these to things but just one at each time, now i'm wondering to put them working together..i've already tried but it didn't work how i wish it did. The acquisition was working to slow, it seems like i'm not having suficient points of my signal, to be honest i'd never understood the purpose of some waiting times inside of the wile loops and i decided to take them away and the response of the system becomes better but not enough. If some one can help me understood the problem and how to regulate the acquisition to get a good signal view it would be great. i'll attach the VI's i've used and a printscreen of what should be a 50Hz sine wave. Thanks M_Silva

Digital I/O

NI 9201+ 9474 troubles

Author

Hi Olivier,

it's me again...i've made some progresses since the last time we talked, i have change my PWM generation and i think i now have my FPGA and my HOST synchronised cause i'm not getting the overflow condition as much as i get before. At the acquisition i still have some doubts, in the waveform graph seems that my periods take a half of a desired period more in each period i that i generate, but in the scope the period generation is fine. Can you give me an idea to fix this??

Thanks

Regards

Mário