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The performance table below was compiled using the Embedded Workbench function profiler. FFT execution times were then calculated from the reported CPU cycle count assuming an MCLK rate of 25MHz.
Algorithm
N=64
N=128
N=256
N=512
N=1024
N=2048
MSP430 Extended C - Integer (16 Bit)
0.9ms
2.1ms
4.7ms
8.9ms
22.9ms
49.7ms
Standard ANSI C - Floating Point (32 Bit)
10.8ms
25.7ms
59.7ms
135.4ms
304.2ms
Note 1.
Note 1. Insufficient RAM on selected MSP430 device (MSP430F5418A) for algorithm compilation.
Note 2. The above results are for method MyFFT_CalculateDft(). Besides the DFT calculation, this method also copies data from the circular input buffer to the FFT workspace, applies the Kaiser window function and performs data reordering so that the DFT result is in natural order. The DFT calculation alone accounts for approximately 85% of the overall time.
Now I'm confused with "the Embedded Wrokbench function profiler". This is provided by TI company or others? How can I use this profile in my program? Can you give me some examples or datasheet. Thank you very much.
