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From: John on 13 Aug 2010 19:44
"Doug Olney" <olney_doug(a)keithley.com> wrote in message <eefa4ca.3(a)webx.raydaftYaTP>...
> It is possible to call the ftdi dll directly from Matlab 7.0. The
> trick is to create a reasonable .h file. I'm not good with MEX
> files, so I just grabbed the FTDI documentation and created my own.
> The key routines I use appear like this in the header file:
>
> long FT_Open(
> int deviceNumber,
> unsigned long int *pHandle
> );
>
> long FT_Close(
> unsigned long ftHandle
> );
>
> long FT_Read(
> unsigned long ftHandle,
> unsigned long * lpBuffer,
> unsigned long nBufferSize,
> unsigned long * lpBytesReturned
> );
>
>
> long FT_Write(
> unsigned long ftHandle,
> ussigned long * lpBuffer,
> unsigned long nBufferSize,
> unsigned long * lpBytesWritten
> );
>
> etc.
>
> Notice that I don't call ftHandle a void * - Matlab tends to crash
> when I do that. So, I treat it as a 32 bit number I have to cart
> around.
>
> With a good version of the .h file, the matlab syntax is:
>
> loadlibrary('FTD2XX.dll','myFTD2XXheader.h')
> usbMem = uint32(0);
> handlePtr = libpointer('uint32Ptr',usbMem);
> deviceNum = 0;
> retval = calllib('FTD2XX', 'FT_Open', deviceNum, handlePtr);
>
> handle = get(handlePtr,'Value');
>
> The handle is then the first pass parameter to all the functions.
> You have to FT_Close when you are done. If you are reading short
> messages (one or two words) back, don't forget to use
> FT_SetLatencyTimer to 1 ms, so the FTDI will flush out the partial
> buffer.
>
> This was done on windows.
>
> Doug Olney
>
> Luiz Henrique Kleinmayer wrote:
> >
> >
> > Hi...
> >
> > Jarrett,
> > Did you make an implementation which uses
> > ftd2xx.h / ftd2xx.lib to talk to an ftdi chip?
> > I´m trying to do it, but it´s not working.
> > Can you help me?
> >
> > Thanks
> > Kleinmayer
> >
Stellar information. Do you have anymore code to share? I'm having a heck of a time setting the bit mode and writing to the device. Sadly, the VCP will not work for me.. I need to toggle individual pins. thanks.
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