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From: tomtorfs on 8 Sep 2005 14:10
Everyone,

I have a virtual serial port (this actually connects to an FTDI USB
device), running at 1000000 baud. In C++ I can easily open the serial
port and assign a value of 1000000 to the BaudRate field of the DCB and
everything will function fine.

Now I have to do the same from Matlab. I tried the following code:
usbserialport = 'COM7';
s = serial(usbserialport,'BaudRate',1000000);
%s = serial(usbserialport,'BaudRate',115200);
fopen(s)
s % show serial port settings
b = 0;
while b~=83, % wait for sync character
b = fread(s,1)
end

When I operate at 115200 baud this works fine, but at 1000000 baud the
fread() command times out, even though data is coming.

Is this a known issue, and is there a workaround? If not I will have to
resort to the somewhat ugly solution of writing an external C++
function to do the interface and calling it from Matlab using the MEX
system... or better suggestions?

Thanks,
Tom

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