How to write a C programme operating on continuously incoming data from a usb device

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Please help me to solve the problem..

I am trying to do fft of data continuously fed via usb port....

Posted 17-Mar-10 3:37am

mathewjohnth

Updated 17-Mar-10 3:38am

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Solution 2

Thank You Khythen,

I am using a dsp processor.
I already have the C code to perform fft. But in that code the data is taken from a file.

What change i should bring to that code...i stead of reading ffrom a file.

Posted 17-Mar-10 23:17pm

mathewjohnth

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Kythen · Accepted Answer · 2010-03-17T05:45:00

Solution 1

You should refer to the documentation and/or API for your USB device. Most likely you will have to either call API functions for the device or one of the Win32 functions ReadFile or DeviceIoControl.

Posted 17-Mar-10 5:45am

Kythen

Avi Berger · Accepted Answer · 2010-03-18T05:23:00

You are somehow getting the data from the USB connection to your DSP chip. How, you have not said. (interrupts, polling, shared memory? your code, a library routine?)

Buffer this data. When you have enough of it, process it just like you would have if it came from a file.

Do deal with synchronizing access to the buffer so that processing data out of it does not conflict with adding data to it. Perhaps you will need to employ double buffering or a ping-pong buffer.