Tool/software: Code Composer Studio
Hi there,
I have read through other relevant posts about this demo code, of which there were a couple. I did not see anyone who is having my issue, so I am creating my own post.
I have successfully imported the FFT Filter Demo Code to my eZDSP USB board, and I have read the Release Notes pdf associated with that code. I have made very minimal changes to the code, only to try each of the different test inputs (the ones not from the codec input) and also to try different FFT Lengths.
I am able to debug, load and run the code without any apparent issues. The code should be performing an FFT on a sine wave stored from memory, and outputting that result as well as the unfiltered result to the headphone jack of my computer. The board's LED is supposed to alternate on/off every five seconds to indicate if the signal is being filtered or not.
My problems: The LED is flashing, and as I said the code doesn't seem to have any issues, however there is no sound either through the computers speakers or when I plug in headphones. There is no issue with my headphones or the computer, because I can listen to any other sound in either configuration.
Additionally, I tried to graph the FFT as another way to view the output, and was unsuccessful, the output is always just 0. This could potentially be an issue with the start address I am using for that graph; I am doing a single time graph and using the start address suggested in this document:
which is 0x3000.
If you have any idea why the FFT output seems to 0 that would be helpful, its possible I need to add more user inputs to the demo code to make it work? The release notes seem to indicate that once you load it to the eZDSP USB Stick it should be ready to test, and I did confirm that the test inputs are being used, not the codec input.
Additional information: I am using code composer studio version 4.
Thanks!
