David: Thanks again for the great work on this package!
I ran into an issue when trying to stream data from our USB 1608GX device. When calling code to get continuous data I would get a USB Overflow Error (sample code shown below).
dev.start_continuous_transfer(rate_hz, 1000, packet_size=packet_size)
dev.send_message("AISCAN:START")
while True:
data = dev.get_new_bulk_data(wait=True) # ERROR HERE: USBError: [Errno 84] Overflow
The fix for this is that the packet_size needs to be in multiples of 512. If I manually set the packet size to:
packet_size = X (where X is some integer multiple of 512 that you want)
dev.start_continuous_transfer(rate_hz, 1000, packet_size=packet_size)
then it works! In your module code for start_continuous_transfer you appear to be setting the packet size based on multiples of 64.
This reference I found indicated that the packet sizes must be multiples of 512: http://libusb.sourceforge.net/api-1.0/packetoverflow.html
I have also noticed that if I try to stream data at rates beyond 100kHz for our 1608GX it stops after a bit. I've seen this with the .NET library from measurement computing and with your code. The 1608GX is supposed to go up to 500kHz. I think their devices can't stream long term as fast as they claim. I've had to tune the speed down to get it to work in a stable manner.
-Anthony
David: Thanks again for the great work on this package!
I ran into an issue when trying to stream data from our USB 1608GX device. When calling code to get continuous data I would get a USB Overflow Error (sample code shown below).
The fix for this is that the packet_size needs to be in multiples of 512. If I manually set the packet size to:
then it works! In your module code for start_continuous_transfer you appear to be setting the packet size based on multiples of 64.
This reference I found indicated that the packet sizes must be multiples of 512: http://libusb.sourceforge.net/api-1.0/packetoverflow.html
I have also noticed that if I try to stream data at rates beyond 100kHz for our 1608GX it stops after a bit. I've seen this with the .NET library from measurement computing and with your code. The 1608GX is supposed to go up to 500kHz. I think their devices can't stream long term as fast as they claim. I've had to tune the speed down to get it to work in a stable manner.
-Anthony