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VISA write problem

hi, people. I'm having some problems with the VISA write module by USB-HID.
I'm been able of receive data from the pic by hid-interrupt, using VISA's particular event, but i cannot send data out (pc-pic); it just get stuck when i asked for it.
i don't know if it is a sync problem between the device and the pc -issue that i have had with USB BULK-, or just bad programming.

particularly i'm using a modified version of the HID MOUSE EXAMPLE SIMPLE, and a pic18f4550.
the structure of the pic firmware is something like this:

if some external event then send data.
then, see if there are some data out pending.
if not, repeat loop.
everything using the same endpoint nº1.

thanks a lot for the help.

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Hello! It might be going wrong because you're not using a USB functionm to do that. You should to use the "VISA USB Control Out Control" instead "VISA Write" Take a look at the "USB RAW - Control.vi" example. It's too close to what you want. Go to Help>>Find Examples. In the Browse tab, go to Hardware Input and Output>>VISA>> USB RAW - Control.vi
Felipe Flores
Application Engineer
National Instruments Brazil




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thanks a lot, ill give it a try, 

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Please, let me know if that work!

 

Regards

Felipe Flores
Application Engineer
National Instruments Brazil




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