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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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本文为[ToneChip]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/04/202204231923488270.html
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