Hi there,
I am working on a LabVIEW 8.5 program to read some A/D values from an
instrument we built. The instrument has a Microchip PIC18F4550
microcontroller in it, and the USB firmware supplied by Microchip
configures the chip with an Interrupt OUT and an Interrupt IN endpoint.
I'm using NI-VISA 4.2 for communication, and the PC OS is Windows XP
Pro.
I used NI VISA Driver Development Wizard to create a USB RAW driver, and
my device shows up under MAX just as it should. After I got my device configured, I wrote a simple VI that waits for
the user to enter a device command and push a button, and after the
button is pushed the VI waits for a response. The command is sent via Interrupt OUT transfer, and the response is via Interrupt IN.
The problem I have is that I
can't run my VI more than once. If I run it once I can send a command to and get a response back from the device, but if I re-run the VI it times out waiting for an interrupt event from the device. I can get the VI to work one more time by unplugging my device from USB and plugging it back in again, but that's obviously not a good way to handle things.
My question is, am I handling all of the VISA I/O correctly? As far as I can tell I have, but maybe I need another set of eyes. Attached is my VI.
Thanks,
Mike
