typecast in MatLab to convert data type

We need to get real-time neural signal from Hitachi’s ETG4000. Hitachi provides a MatLab script “RealtimeOT” to get data from a parallel port and convert the binary data to float. Here is what they did:

fp=fopen('temp','w+');fwrite(fp,bindata);fseek(fp,-4,'cof');
floatdata =fread(fp,4,'float');
fclose(fp);delete('temp');

This piece of code will be called a few hundred times per second. Converting data using file is too slow. As a result, the signal we get is not real time at all (delay up to 10s). Indeed, there is a very simple way to do this (typecast):

floatdata=typecast(uint8(bindata), 'single');

Then the program runs very smoothly and there is no delay.

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