TMS320C6678開(kāi)發(fā)例程使用手冊(cè)(9)

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3.4FFT_Real_Benchmark——一維FFT性能測(cè)試

此程序的作用是評(píng)估DSP C66x數(shù)字信號(hào)函數(shù)庫(kù)一維FFT計(jì)算性能，測(cè)試16~262144個(gè)實(shí)數(shù)點(diǎn)FFT性能。程序默認(rèn)使用軟件仿真測(cè)試（不計(jì)內(nèi)存延遲），也可使用硬件禁用緩存及使能緩存測(cè)試。

3.4.1軟件仿真（不計(jì)內(nèi)存延遲）

新建軟件仿真配置：

選擇如下配置，點(diǎn)擊save：

使用新建的仿真配置，進(jìn)入debug界面。

按照工程導(dǎo)入步驟加載FFT_Real_Benchmark.out文件，然后點(diǎn)擊程序運(yùn)行按鈕。

[TMS320C66x_0]

Test signal

-Include 2V DC Component

-Include 3V AC Component,Frequency:50Hz Phase:-30 Degree

-Include 1.5V AC Component,Frequency:75Hz Phase:90 Degree

-Formula:y=2+3cos(2pi*50t-(30/180)pi)+1.5cos(2pi*75t+*(90/180)pi)

--------------------------- Cache Disabled ---------------------------

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1: 16 Point FFT Test

-Sampling Period:1s Sampling Frequency:16Hz Frequency Resolution:1Hz

-Forward Transformation Execution Cycle is 263

-Forward Transformation Execution Time is 0.2630000 us (CPU Frequency:1000MHz)

-Inverse Transformation Execution Cycle is 288

-Inverse Transformation Execution Time is 0.2880000 us (CPU Frequency:1000MHz)

16 Point FFT Test End

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2: 32 Point FFT Test

-Sampling Period:1s Sampling Frequency:32Hz Frequency Resolution:1Hz

-Forward Transformation Execution Cycle is 295

-Forward Transformation Execution Time is 0.2950000 us (CPU Frequency:1000MHz)

-Inverse Transformation Execution Cycle is 297

-Inverse Transformation Execution Time is 0.2970000 us (CPU Frequency:1000MHz)

32 Point FFT Test End

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3: 64 Point FFT Test

-Sampling Period:1s Sampling Frequency:64Hz Frequency Resolution:1Hz

-Forward Transformation Execution Cycle is 396

-Forward Transformation Execution Time is 0.3960000 us (CPU Frequency:1000MHz)

-Inverse Transformation Execution Cycle is 394

-Inverse Transformation Execution Time is 0.3940000 us (CPU Frequency:1000MHz)

64 Point FFT Test End

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4: 128 Point FFT Test

-Sampling Period:1s Sampling Frequency:128Hz Frequency Resolution:1Hz

-Forward Transformation Execution Cycle is 581

-Forward Transformation Execution Time is 0.5810000 us (CPU Frequency:1000MHz)

-Inverse Transformation Execution Cycle is 576

-Inverse Transformation Execution Time is 0.5760000 us (CPU Frequency:1000MHz)

128 Point FFT Test End

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5: 256 Point FFT Test

-Sampling Period:1s Sampling Frequency:256Hz Frequency Resolution:1Hz

-Forward Transformation Execution Cycle is 1138

-Forward Transformation Execution Time is 1.1380000 us (CPU Frequency:1000MHz)

-Inverse Transformation Execution Cycle is 1112

-Inverse Transformation Execution Time is 1.1120000 us (CPU Frequency:1000MHz)

256 Point FFT Test End

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6: 512 Point FFT Test

-Sampling Period:1s Sampling Frequency:512Hz Frequency Resolution:1Hz

-Forward Transformation Execution Cycle is 2027

-Forward Transformation Execution Time is 2.0270000 us (CPU Frequency:1000MHz)

-Inverse Transformation Execution Cycle is 1974

-Inverse Transformation Execution Time is 1.9740000 us (CPU Frequency:1000MHz)

512 Point FFT Test End

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7: 1024 Point FFT Test

-Sampling Period:1s Sampling Frequency:1024Hz Frequency Resolution:1Hz

-Forward Transformation Execution Cycle is 4520

-Forward Transformation Execution Time is 4.5200000 us (CPU Frequency:1000MHz)

-Inverse Transformation Execution Cycle is 4398

-Inverse Transformation Execution Time is 4.3980000 us (CPU Frequency:1000MHz)

1024 Point FFT Test End

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8: 2048 Point FFT Test

-Sampling Period:1s Sampling Frequency:2048Hz Frequency Resolution:1Hz

-Forward Transformation Execution Cycle is 8753

-Forward Transformation Execution Time is 8.7530000 us (CPU Frequency:1000MHz)

-Inverse Transformation Execution Cycle is 8508

-Inverse Transformation Execution Time is 8.5080000 us (CPU Frequency:1000MHz)

2048 Point FFT Test End

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9: 4096 Point FFT Test

-Sampling Period:1s Sampling Frequency:4096Hz Frequency Resolution:1Hz

-Forward Transformation Execution Cycle is 20046

-Forward Transformation Execution Time is 20.0460000 us (CPU Frequency:1000MHz)

-Inverse Transformation Execution Cycle is 19540

-Inverse Transformation Execution Time is 19.5400000 us (CPU Frequency:1000MHz)

4096 Point FFT Test End

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10: 8192 Point FFT Test

-Sampling Period:1s Sampling Frequency:8192Hz Frequency Resolution:1Hz

-Forward Transformation Execution Cycle is 39767

-Forward Transformation Execution Time is 39.7670000 us (CPU Frequency:1000MHz)

-Inverse Transformation Execution Cycle is 38754

-Inverse Transformation Execution Time is 38.7540000 us (CPU Frequency:1000MHz)

8192 Point FFT Test End

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11: 16384 Point FFT Test

-Sampling Period:1s Sampling Frequency:16384Hz Frequency Resolution:1Hz

-Forward Transformation Execution Cycle is 90484

-Forward Transformation Execution Time is 90.4840000 us (CPU Frequency:1000MHz)

-Inverse Transformation Execution Cycle is 88442

-Inverse Transformation Execution Time is 88.4420000 us (CPU Frequency:1000MHz)

16384 Point FFT Test End

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12: 32768 Point FFT Test

-Sampling Period:1s Sampling Frequency:32768Hz Frequency Resolution:1Hz

-Forward Transformation Execution Cycle is 180605

-Forward Transformation Execution Time is 180.6050000 us (CPU Frequency:1000MHz)

-Inverse Transformation Execution Cycle is 176520

-Inverse Transformation Execution Time is 176.5200000 us (CPU Frequency:1000MHz)

32768 Point FFT Test End

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13: 65536 Point FFT Test

-Sampling Period:1s Sampling Frequency:65536Hz Frequency Resolution:1Hz

-Forward Transformation Execution Cycle is 405914

-Forward Transformation Execution Time is 405.9140000 us (CPU Frequency:1000MHz)

-Inverse Transformation Execution Cycle is 397728

-Inverse Transformation Execution Time is 397.7280000 us (CPU Frequency:1000MHz)

65536 Point FFT Test End

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14: 131072 Point FFT Test

-Sampling Period:1s Sampling Frequency:131072Hz Frequency Resolution:1Hz

-Forward Transformation Execution Cycle is 811427

-Forward Transformation Execution Time is 811.4270000 us (CPU Frequency:1000MHz)

-Inverse Transformation Execution Cycle is 795054

-Inverse Transformation Execution Time is 795.0540000 us (CPU Frequency:1000MHz)

131072 Point FFT Test End

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15: 262144 Point FFT Test

-Sampling Period:1s Sampling Frequency:262144Hz Frequency Resolution:1Hz

-Forward Transformation Execution Cycle is 1802688

-Forward Transformation Execution Time is 1802.6880000 us (CPU Frequency:1000MHz)

-Inverse Transformation Execution Cycle is 1769926

-Inverse Transformation Execution Time is 1769.9260000 us (CPU Frequency:1000MHz)

262144 Point FFT Test End

Test Finished!