I am helpless with this one, I have a digital Pulse oximeter which acts as a COM device - connected through USB port. When it connects, I see on the device manager COM4 port activated with it.
But when I write
The Matlab application goes into an endless busy mode. The only two ways to get out is cntrl-alt-del, or On the device, is an option to switch the USB on or off manually. By default the USB mode is on, but if I switch it to off manually, I can now access Matlab.
To rerun the above I have to give
Surprisingly, the following works:
1. replace ser.BytesAvailable by 512
2. Put USB mode 'off; then run the Matlab program; while it is waiting put the USB mode to 'On' manually on the device. Then I get 512 bytes of data out.
Whenever I replace 512 with BytesAvailable I get error "SIZE has to be greater than 0". Also wheever I run the code with USB 'On', fopen hangs Matlab. On debugging I found that the place where the code hangs is at fopen(getobject1) in fopen.m
Any ideas suggestions. Please help. Thanks. rajn