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C6748 software simulation and hardware test - with detailed FFT hardware measurement time

2022-04-23 19:29:00 【ToneChip】

Recently C6748 DSP Do on FFT Time measurement , notice 8192 spot FFT The measurement time is 467us, And the result of my hardware test is 882us, I wonder what's wrong ????

The results look good , Find out CCS There's one " Software emulation " and " Hardware simulation "

Software simulation mode （ No memory access latency ） The difference between and hardware simulation lies in the use of ccxml Different files

 

Now sort out the comparison results

The debugging condition is that the optimization level is opened to 3

Actual detailed running time of hardware (6748 Dominant frequency run 456M Hz)

--------------------------- Cache Disabled ---------------------------
　 DSPF_sp_cfftr2_dit DSPF_sp_fftSPxSP DSPF_sp_icfftr2_dif DSPF_sp_ifftSPxSP
32 47.51us 29.46us 46.11us 29.32us
64 106.21us 57.21us 105.58us 56.39us
128 239.95us 154.52us 238.69us 152.84us
256 537.04us 308.41us 534.76us 302.72us
512 1184.55us 756.07us 1182.24us 748.86us
1024 2601.47us 1485.80us 2598.27us 1477.94us
2048 5674.80us 3578.33us 5666.62us 3559.37us
4096 12527.40us 7147.63us 12470.40us 7125.05us
8192 27472.50us 17031.80us 27218.28us 16981.55us
16384 59800.18us 34004.56us 59975.67us 34046.73us
32768 129329.05us 78609.17us 128633.07us 78713.64us
65536 　 　 　 　
131072 　 　 　 　
--------------------------- Cache Enabled ---------------------------
　 DSPF_sp_cfftr2_dit DSPF_sp_fftSPxSP DSPF_sp_icfftr2_dif DSPF_sp_ifftSPxSP
32 0.94us 1.07us 1.24us 1.38us
64 2.06us 1.92us 2.51us 2.59us
128 4.57us 4.26us 5.41us 5.67us
256 10.15us 8.18us 11.99us 11.01us
512 22.43us 18.39us 26.37us 24.08us
1024 49.23us 36.16us 58.08us 46.76us
2048 107.34us 83.42us 127.30us 101.94us
4096 265.84us 199.11us 312.63us 245.76us
8192 880.92us 769.32us 1091.82us 880.77us
16384 1910.95us 2456.24us 2699.05us 2271.15us
32768 6882.59us 11756.84us 8638.64us 11724.79us
65536 　 　 　 　
131072 　 　 　 　

 

The picture version is a little clearer

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https://yzsam.com/2022/04/202204231923488270.html

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