【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

hello everybody，老编又来更新啦！上两集我们讲了TMS320C6748开发板基于SYS/BIOS的Demo例程演示，戳这里回顾前文：https://blog.csdn.net/Celiachenv587/article/details/88098851，那接下来几篇我们来聊聊算法的Demo例程演示。

  1. FIR——有限长单位冲激响应滤波器

       此程序的作用是进行FIR有限长单位冲激响应滤波器测试。

       按照工程导入步骤加载FIR.out文件，然后点击程序运行【学习分享】6 TMS320C6748开发板算法Demo例程演示（一） 按钮，程序会在断点处停下来。

       点击CCS菜单"Tools->Graph->Single Time"，在弹出的界面中按下图数值设置参数。

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图599

 

       点击OK，即可查看原始时域信号+噪声波形，如下图所示：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图600

 

       点击CCS菜单"Tools->Graph->Single Time"，在弹出的界面中按下图数值设置参数。

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图601

 

       点击OK，即可查看滤波后时域信号波形，如下图所示：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图602

 

       点击CCS菜单"Tools->Graph->FFT Magnitude"，在弹出的界面中按下图数值设置参数。

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图603

 

       点击OK，即可查看原始频域信号+噪声波形，如下图所示：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图604

 

       点击CCS菜单"Tools->Graph->FFT Magnitude"，在弹出的界面中按下图数值设置参数。

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图605

 

       点击OK，即可查看滤波后频域信号波形，如下图所示：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图606

 

Matlab FIR滤波器辅助设计

       打开Matlab软件，并打开"Filter Designed&Analaysis Tool"工具，在弹出的界面中按照所需滤波器修改以下参数：

  1. 滤波器类型：低通Lowpass；
  2. 滤波方式： 等纹波FIR（Equiripple）；
  3. 滤波器阶数：Specifyorder（31+1阶）；
  4. 采样频率：1000Hz；
  5. 通带截止频率：150Hz；
  6. 阻带截止频率：350Hz   ；

       如下图所示：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图607

 

       点击"Filter Designed&Analaysis Tool"工具菜单"Target->Generate C Header"，在弹出的窗口中修改"Exportas"参数为"Single-precisionfloat"（单精度浮点型），其他设置按下图所示：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图608

 

       最后点击Generate生成包含滤波器系数的.h头文件。此头文件的数据用于FIR函数，如下图所示：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图609

 

备注：

  1. 信号频率100Hz，噪声频率450Hz；
  2. 若采用TIC6000DSP库开发，请选用实数FIR非优化滤波函数；

2、IIR——无限脉冲响应数字滤波器

       此程序的作用是进行IIR无限脉冲响应数字滤波器测试。

       按照工程导入步骤加载IIR.out文件，然后点击程序运行【学习分享】6 TMS320C6748开发板算法Demo例程演示（一） 按钮，程序会在断点处停下来。

点击CCS菜单"Tools->Graph->Single Time"，在弹出的界面中点击Import按钮，选择IIR工程下的"IIR_Graph\IIR_In_Time.graphProp"后点击OK，可以发现在CCS底部出现如下原始时域信号+噪声波形：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图610

 

       点击CCS菜单"Tools->Graph->Single Time"，在弹出的界面中点击Import按钮，选择IIR工程下的"IIR_Graph\IIR_Out_Time.graphProp"后点击OK，可以发现在CCS底部出现如下原始时域信号波形：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图611

 

       点击CCS菜单"Tools->Graph->FFT Magnitude "，在弹出的界面中点击Import按钮，选择IIR工程下的"IIR_Graph\IIR_In_FFT.graphProp"后点击OK，可以发现在CCS底部出现如下滤波后频域信号+噪声波形：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图612

 

       击CCS菜单"Tools->Graph->FFT Magnitude"，在弹出的界面中点击Import按钮，选择IIR工程下的"IIR_Graph\IIR_OuT_FFT.graphProp"后点击OK，可以发现在CCS底部出现如下滤波后频域信号波形：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图613

 

Matlab IIR滤波器辅助设计

       打开Matlab软件，并打开"Filter Designed&Analaysis Tool"工具，在弹出的界面中按照所需滤波器修改以下参数：

  1. 滤波器类型：低通Lowpass；
  2. 滤波方式：巴特沃斯IIR（Butterworth）；
  3. 滤波器阶数：Specifyorder（4+1阶）；
  4. 采样频率：1000Hz；
  5. 通带截止频率：150Hz；

       如下图所示：   

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图614

 

       点击"Filter Designed&Analaysis Tool"工具菜单"Target->Generate C Header"，在弹出的窗口中修改"Exportas"参数为"Single-precisionfloat"（单精度浮点型），其他设置按照下图所示：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图615

 

       最后点击Generate生成包含滤波器系数的.h头文件。此头文件的数据用于IIR函数，如下图所示：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图616

 

备注：

信号频率100Hz，噪声频率450Hz；

若采用TIC6000DSP库开发，请选用实数IIR非优化滤波函数；

3、Matrix——矩阵运算

       此程序的作用是进行Matrix矩阵运算测试。

       按照工程导入步骤加载Matrix.out文件，然后点击程序运行【学习分享】6 TMS320C6748开发板算法Demo例程演示（一） 按钮，程序会在断点处停下来。

演示现象

CCS的Console会打印测试结果。

[C674X_0] 矩阵运算测试：

***********************

矩阵A：4*4

       3.00.07.02.0

       0.00.0  -1.0  -1.0

       0.02.00.04.0

       1.05.00.02.0

矩阵B：4*2

4.01.0

0.0  -1.0

       1.02.0

3.0  -1.0

矩阵C：4*4

       2.01.00.0  -3.0

       5.00.0  -1.09.0

       4.00.06.0  -2.0

       7.00.01.08.0

***********************

矩阵A的转置矩阵为：

       3.00.00.01.0

       0.00.02.05.0

7.0  -1.00.00.0

2.0  -1.04.02.0

矩阵B的转置矩阵为：

       4.00.01.03.0

1.0  -1.02.0  -1.0

***********************

矩阵D=A*B：（外积）

25.015.0

       -4.0  -1.0

12.0  -6.0

10.0  -6.0

***********************

矩阵E=A.*B：（内积）

       6.00.00.0  -6.0

       0.00.01.0  -9.0

       0.00.00.0  -8.0

       7.00.00.016.0

***********************

4、FFT——快速傅里叶变换/逆变换

       此程序的作用是实现FFT处理功能，但是没有打开缓存。

       按照工程导入步骤加载FFT.out文件，然后点击程序运行【学习分享】6 TMS320C6748开发板算法Demo例程演示（一） 按钮。

       CCS支持绘制多种类型的图表时域图、频域图、瀑布图等等。待测试信号为原始信号做1K采样频率进行1024个点抽样得到。

信号源公式：y=5*sin（2*pi*150*t）+15*sin（2*pi*350*t）

   该信号含有150Hz和350Hz两种频率分量。

演示步骤现象

       点击"Tools->Graph->Single Time"选择单时域信号图，如下图所示：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图617

 

       按照下图进行设置：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图618

 

       点击OK，CCS界面底部弹出如下界面：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图619

 

       MATLAB代码FFT.m文件位于FFT工程目录下，程序如下图：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图620

 

       MATLAB图表如下图：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图621

 

       经对比可以看出经过DSPC6748计算的结果与MATLAB计算结果一致.

5、FFT_Benchmark——快速傅里叶变换/逆变换（打开/关闭缓存速度对比）

       此程序的作用是测试快速傅里叶变换/快速傅里叶逆变换处理速度。

       将开发板的UART2和PC机连接，打开串口调试软件，按照工程导入步骤加载FFT_Benchmark.out文件，然后点击程序运行【学习分享】6 TMS320C6748开发板算法Demo例程演示（一） 按钮。

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

演示现象

串口会打印测试结果。

  1. 软件仿真模式（无内存访问延迟）

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 ---------------------------
--------------------------------------------------
1: 8 Point FFT Test 
-Sampling Period:1s Sampling Frequency:8Hz Frequency Resolution:1Hz
Use DSPF_sp_fftSPxSP Function
-Forward Transformation Execution Cycle is 144 
-Forward Transformation Execution Time is 0 us （CPU Frequency:456MHz）
Use DSPF_sp_ifftSPxSP Function
-Inverse Transformation Execution Cycle is 159 
-Inverse Transformation Execution Time is 0 us （CPU Frequency:456MHz）
8 Point FFT Test End
--------------------------------------------------
2: 16 Point FFT Test 
-Sampling Period:1s Sampling Frequency:16Hz Frequency Resolution:1Hz
Use DSPF_sp_fftSPxSP Function
-Forward Transformation Execution Cycle is 168 
-Forward Transformation Execution Time is 0 us （CPU Frequency:456MHz）
Use DSPF_sp_ifftSPxSP Function
-Inverse Transformation Execution Cycle is 183 
-Inverse Transformation Execution Time is 0 us （CPU Frequency:456MHz）
16 Point FFT Test End
--------------------------------------------------
3: 32 Point FFT Test 
-Sampling Period:1s Sampling Frequency:32Hz Frequency Resolution:1Hz
Use DSPF_sp_cfftr2_dit Function
-Forward Transformation Execution Cycle is 370 
-Forward Transformation Execution Time is 0 us （CPU Frequency:456MHz）
Use DSPF_sp_fftSPxSP Function
-Forward Transformation Execution Cycle is 299 
-Forward Transformation Execution Time is 0 us （CPU Frequency:456MHz）
Use DSPF_sp_icfftr2_dif Function
-Inverse Transformation Execution Cycle is 424 
-Inverse Transformation Execution Time is 0 us （CPU Frequency:456MHz）
Use DSPF_sp_ifftSPxSP Function
-Inverse Transformation Execution Cycle is 316 
-Inverse Transformation Execution Time is 0 us （CPU Frequency:456MHz）
32 Point FFT Test End
--------------------------------------------------
4: 64 Point FFT Test 
-Sampling Period:1s Sampling Frequency:64Hz Frequency Resolution:1Hz
Use DSPF_sp_cfftr2_dit Function
-Forward Transformation Execution Cycle is 818 
-Forward Transformation Execution Time is 1 us （CPU Frequency:456MHz）
Use DSPF_sp_fftSPxSP Function
-Forward Transformation Execution Cycle is 467 
-Forward Transformation Execution Time is 1 us （CPU Frequency:456MHz）
Use DSPF_sp_icfftr2_dif Function
-Inverse Transformation Execution Cycle is 979 
-Inverse Transformation Execution Time is 2 us （CPU Frequency:456MHz）
Use DSPF_sp_ifftSPxSP Function
-Inverse Transformation Execution Cycle is 484 
-Inverse Transformation Execution Time is 1 us （CPU Frequency:456MHz）
64 Point FFT Test End
--------------------------------------------------
5: 128 Point FFT Test 
-Sampling Period:1s Sampling Frequency:128Hz Frequency Resolution:1Hz
Use DSPF_sp_cfftr2_dit Function
-Forward Transformation Execution Cycle is 1842 
-Forward Transformation Execution Time is 4 us （CPU Frequency:456MHz）
Use DSPF_sp_fftSPxSP Function
-Forward Transformation Execution Cycle is 1059 
-Forward Transformation Execution Time is 2 us （CPU Frequency:456MHz）
Use DSPF_sp_icfftr2_dif Function
-Inverse Transformation Execution Cycle is 2254 
-Inverse Transformation Execution Time is 4 us （CPU Frequency:456MHz）
Use DSPF_sp_ifftSPxSP Function
-Inverse Transformation Execution Cycle is 1078 
-Inverse Transformation Execution Time is 2 us （CPU Frequency:456MHz）
128 Point FFT Test End
--------------------------------------------------
6: 256 Point FFT Test 
-Sampling Period:1s Sampling Frequency:256Hz Frequency Resolution:1Hz
Use DSPF_sp_cfftr2_dit Function
-Forward Transformation Execution Cycle is 4146 
-Forward Transformation Execution Time is 9 us （CPU Frequency:456MHz）
Use DSPF_sp_fftSPxSP Function
-Forward Transformation Execution Cycle is 1955 
-Forward Transformation Execution Time is 4 us （CPU Frequency:456MHz）
Use DSPF_sp_icfftr2_dif Function
-Inverse Transformation Execution Cycle is 5129 
-Inverse Transformation Execution Time is 11 us （CPU Frequency:456MHz）
Use DSPF_sp_ifftSPxSP Function
-Inverse Transformation Execution Cycle is 1974 
-Inverse Transformation Execution Time is 4 us （CPU Frequency:456MHz）
256 Point FFT Test End
--------------------------------------------------
7: 512 Point FFT Test 
-Sampling Period:1s Sampling Frequency:512Hz Frequency Resolution:1Hz
Use DSPF_sp_cfftr2_dit Function
-Forward Transformation Execution Cycle is 9266 
-Forward Transformation Execution Time is 20 us （CPU Frequency:456MHz）
Use DSPF_sp_fftSPxSP Function
-Forward Transformation Execution Cycle is 4675 
-Forward Transformation Execution Time is 10 us （CPU Frequency:456MHz）
Use DSPF_sp_icfftr2_dif Function
-Inverse Transformation Execution Cycle is 11524 
-Inverse Transformation Execution Time is 25 us （CPU Frequency:456MHz）
Use DSPF_sp_ifftSPxSP Function
-Inverse Transformation Execution Cycle is 4696 
-Inverse Transformation Execution Time is 10 us （CPU Frequency:456MHz）
512 Point FFT Test End
--------------------------------------------------
8: 1024 Point FFT Test 
-Sampling Period:1s Sampling Frequency:1024Hz Frequency Resolution:1Hz
Use DSPF_sp_cfftr2_dit Function
-Forward Transformation Execution Cycle is 20530 
-Forward Transformation Execution Time is 45 us （CPU Frequency:456MHz）
Use DSPF_sp_fftSPxSP Function
-Forward Transformation Execution Cycle is 9155 
-Forward Transformation Execution Time is 20 us （CPU Frequency:456MHz）
Use DSPF_sp_icfftr2_dif Function
-Inverse Transformation Execution Cycle is 25599 
-Inverse Transformation Execution Time is 56 us （CPU Frequency:456MHz）
Use DSPF_sp_ifftSPxSP Function
-Inverse Transformation Execution Cycle is 9176 
-Inverse Transformation Execution Time is 20 us （CPU Frequency:456MHz）
1024 Point FFT Test End
--------------------------------------------------
9: 2048 Point FFT Test 
-Sampling Period:1s Sampling Frequency:2048Hz Frequency Resolution:1Hz
Use DSPF_sp_cfftr2_dit Function
-Forward Transformation Execution Cycle is 45106 
-Forward Transformation Execution Time is 98 us （CPU Frequency:456MHz）
Use DSPF_sp_fftSPxSP Function
-Forward Transformation Execution Cycle is 21731 
-Forward Transformation Execution Time is 47 us （CPU Frequency:456MHz）
Use DSPF_sp_icfftr2_dif Function
-Inverse Transformation Execution Cycle is 56314 
-Inverse Transformation Execution Time is 123 us （CPU Frequency:456MHz）
Use DSPF_sp_ifftSPxSP Function
-Inverse Transformation Execution Cycle is 21754 
-Inverse Transformation Execution Time is 47 us （CPU Frequency:456MHz）
2048 Point FFT Test End
--------------------------------------------------
10: 4096 Point FFT Test 
-Sampling Period:1s Sampling Frequency:4096Hz Frequency Resolution:1Hz
Use DSPF_sp_cfftr2_dit Function
-Forward Transformation Execution Cycle is 98354 
-Forward Transformation Execution Time is 215 us （CPU Frequency:456MHz）
Use DSPF_sp_fftSPxSP Function
-Forward Transformation Execution Cycle is 43235 
-Forward Transformation Execution Time is 94 us （CPU Frequency:456MHz）
Use DSPF_sp_icfftr2_dif Function
-Inverse Transformation Execution Cycle is 122869 
-Inverse Transformation Execution Time is 269 us （CPU Frequency:456MHz）
Use DSPF_sp_ifftSPxSP Function
-Inverse Transformation Execution Cycle is 43258 
-Inverse Transformation Execution Time is 94 us （CPU Frequency:456MHz）
4096 Point FFT Test End
--------------------------------------------------
11: 8192 Point FFT Test 
-Sampling Period:1s Sampling Frequency:8192Hz Frequency Resolution:1Hz
Use DSPF_sp_cfftr2_dit Function
-Forward Transformation Execution Cycle is 213042 
-Forward Transformation Execution Time is 467 us （CPU Frequency:456MHz）
Use DSPF_sp_fftSPxSP Function
-Forward Transformation Execution Cycle is 100611 
-Forward Transformation Execution Time is 220 us （CPU Frequency:456MHz）
Use DSPF_sp_icfftr2_dif Function
-Inverse Transformation Execution Cycle is 266224 
-Inverse Transformation Execution Time is 583 us （CPU Frequency:456MHz）
Use DSPF_sp_ifftSPxSP Function
-Inverse Transformation Execution Cycle is 100636 
-Inverse Transformation Execution Time is 220 us （CPU Frequency:456MHz）
8192 Point FFT Test End
--------------------------------------------------
12: 16384 Point FFT Test 
-Sampling Period:1s Sampling Frequency:16384Hz Frequency Resolution:1Hz
Use DSPF_sp_cfftr2_dit Function
-Forward Transformation Execution Cycle is 458802 
-Forward Transformation Execution Time is 1006 us （CPU Frequency:456MHz）
Use DSPF_sp_fftSPxSP Function
-Forward Transformation Execution Cycle is 200963 
-Forward Transformation Execution Time is 440 us （CPU Frequency:456MHz）
Use DSPF_sp_icfftr2_dif Function
-Inverse Transformation Execution Cycle is 573419 
-Inverse Transformation Execution Time is 1257 us （CPU Frequency:456MHz）
Use DSPF_sp_ifftSPxSP Function
-Inverse Transformation Execution Cycle is 200988 
-Inverse Transformation Execution Time is 440 us （CPU Frequency:456MHz）
16384 Point FFT Test End
--------------------------------------------------
13: 32768 Point FFT Test 
-Sampling Period:1s Sampling Frequency:32768Hz Frequency Resolution:1Hz
Use DSPF_sp_cfftr2_dit Function
-Forward Transformation Execution Cycle is 983090 
-Forward Transformation Execution Time is 2155 us （CPU Frequency:456MHz）
Use DSPF_sp_fftSPxSP Function
-Forward Transformation Execution Cycle is 459043 
-Forward Transformation Execution Time is 1006 us （CPU Frequency:456MHz）
Use DSPF_sp_icfftr2_dif Function
-Inverse Transformation Execution Cycle is 1228774 
-Inverse Transformation Execution Time is 2694 us （CPU Frequency:456MHz）
Use DSPF_sp_ifftSPxSP Function
-Inverse Transformation Execution Cycle is 459070 
-Inverse Transformation Execution Time is 1006 us （CPU Frequency:456MHz）
32768 Point FFT Test End
--------------------------------------------------
14: 65536 Point FFT Test 
-Sampling Period:1s Sampling Frequency:65536Hz Frequency Resolution:1Hz
Use DSPF_sp_fftSPxSP Function
-Forward Transformation Execution Cycle is 917795 
-Forward Transformation Execution Time is 2012 us （CPU Frequency:456MHz）
Use DSPF_sp_ifftSPxSP Function
-Inverse Transformation Execution Cycle is 917822 
-Inverse Transformation Execution Time is 2012 us （CPU Frequency:456MHz）
65536 Point FFT Test End
--------------------------------------------------
15: 131072 Point FFT Test 
-Sampling Period:1s Sampling Frequency:131072Hz Frequency Resolution:1Hz
Use DSPF_sp_fftSPxSP Function
-Forward Transformation Execution Cycle is 2064707 
-Forward Transformation Execution Time is 4527 us （CPU Frequency:456MHz）
Use DSPF_sp_ifftSPxSP Function
-Inverse Transformation Execution Cycle is 2064736 
-Inverse Transformation Execution Time is 4527 us （CPU Frequency:456MHz）
131072 Point FFT Test End
Test Finished!

  1. 硬件测试（禁用缓存及使用缓存）
    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 ---------------------------
    --------------------------------------------------
    1: 8 Point FFT Test 
    -Sampling Period:1s Sampling Frequency:8Hz Frequency Resolution:1Hz
    Use DSPF_sp_fftSPxSP Function
    -Forward Transformation Execution Cycle is 5859 
    -Forward Transformation Execution Time is 12 us （CPU Frequency:456MHz）
    Use DSPF_sp_ifftSPxSP Function
    -Inverse Transformation Execution Cycle is 5770 
    -Inverse Transformation Execution Time is 12 us （CPU Frequency:456MHz）
    8 Point FFT Test End
    --------------------------------------------------
    2: 16 Point FFT Test 
    -Sampling Period:1s Sampling Frequency:16Hz Frequency Resolution:1Hz
    Use DSPF_sp_fftSPxSP Function
    -Forward Transformation Execution Cycle is 4889 
    -Forward Transformation Execution Time is 10 us （CPU Frequency:456MHz）
    Use DSPF_sp_ifftSPxSP Function
    -Inverse Transformation Execution Cycle is 5210 
    -Inverse Transformation Execution Time is 11 us （CPU Frequency:456MHz）
    16 Point FFT Test End
    --------------------------------------------------
    3: 32 Point FFT Test 
    -Sampling Period:1s Sampling Frequency:32Hz Frequency Resolution:1Hz
    Use DSPF_sp_cfftr2_dit Function
    -Forward Transformation Execution Cycle is 24866 
    -Forward Transformation Execution Time is 54 us （CPU Frequency:456MHz）
    Use DSPF_sp_fftSPxSP Function
    -Forward Transformation Execution Cycle is 13687 
    -Forward Transformation Execution Time is 30 us （CPU Frequency:456MHz）
    Use DSPF_sp_icfftr2_dif Function
    -Inverse Transformation Execution Cycle is 24840 
    -Inverse Transformation Execution Time is 54 us （CPU Frequency:456MHz）
    Use DSPF_sp_ifftSPxSP Function
    -Inverse Transformation Execution Cycle is 13728 
    -Inverse Transformation Execution Time is 30 us （CPU Frequency:456MHz）
    32 Point FFT Test End
    --------------------------------------------------
    4: 64 Point FFT Test 
    -Sampling Period:1s Sampling Frequency:64Hz Frequency Resolution:1Hz
    Use DSPF_sp_cfftr2_dit Function
    -Forward Transformation Execution Cycle is 48916 
    -Forward Transformation Execution Time is 107 us （CPU Frequency:456MHz）
    Use DSPF_sp_fftSPxSP Function
    -Forward Transformation Execution Cycle is 26429 
    -Forward Transformation Execution Time is 57 us （CPU Frequency:456MHz）
    Use DSPF_sp_icfftr2_dif Function
    -Inverse Transformation Execution Cycle is 48430 
    -Inverse Transformation Execution Time is 106 us （CPU Frequency:456MHz）
    Use DSPF_sp_ifftSPxSP Function
    -Inverse Transformation Execution Cycle is 26258 
    -Inverse Transformation Execution Time is 57 us （CPU Frequency:456MHz）
    64 Point FFT Test End
    --------------------------------------------------
    5: 128 Point FFT Test 
    -Sampling Period:1s Sampling Frequency:128Hz Frequency Resolution:1Hz
    Use DSPF_sp_cfftr2_dit Function
    -Forward Transformation Execution Cycle is 109656 
    -Forward Transformation Execution Time is 240 us （CPU Frequency:456MHz）
    Use DSPF_sp_fftSPxSP Function
    -Forward Transformation Execution Cycle is 70813 
    -Forward Transformation Execution Time is 155 us （CPU Frequency:456MHz）
    Use DSPF_sp_icfftr2_dif Function
    -Inverse Transformation Execution Cycle is 109292 
    -Inverse Transformation Execution Time is 239 us （CPU Frequency:456MHz）
    Use DSPF_sp_ifftSPxSP Function
    -Inverse Transformation Execution Cycle is 69922 
    -Inverse Transformation Execution Time is 153 us （CPU Frequency:456MHz）
    128 Point FFT Test End
    --------------------------------------------------
    6: 256 Point FFT Test 
    -Sampling Period:1s Sampling Frequency:256Hz Frequency Resolution:1Hz
    Use DSPF_sp_cfftr2_dit Function
    -Forward Transformation Execution Cycle is 245308 
    -Forward Transformation Execution Time is 537 us （CPU Frequency:456MHz）
    Use DSPF_sp_fftSPxSP Function
    -Forward Transformation Execution Cycle is 140847 
    -Forward Transformation Execution Time is 308 us （CPU Frequency:456MHz）
    Use DSPF_sp_icfftr2_dif Function
    -Inverse Transformation Execution Cycle is 244910 
    -Inverse Transformation Execution Time is 537 us （CPU Frequency:456MHz）
    Use DSPF_sp_ifftSPxSP Function
    -Inverse Transformation Execution Cycle is 138932 
    -Inverse Transformation Execution Time is 304 us （CPU Frequency:456MHz）
    256 Point FFT Test End
    --------------------------------------------------
    7: 512 Point FFT Test 
    -Sampling Period:1s Sampling Frequency:512Hz Frequency Resolution:1Hz
    Use DSPF_sp_cfftr2_dit Function
    -Forward Transformation Execution Cycle is 538732 
    -Forward Transformation Execution Time is 1181 us （CPU Frequency:456MHz）
    Use DSPF_sp_fftSPxSP Function
    -Forward Transformation Execution Cycle is 345203 
    -Forward Transformation Execution Time is 757 us （CPU Frequency:456MHz）
    Use DSPF_sp_icfftr2_dif Function
    -Inverse Transformation Execution Cycle is 539358 
    -Inverse Transformation Execution Time is 1182 us （CPU Frequency:456MHz）
    Use DSPF_sp_ifftSPxSP Function
    -Inverse Transformation Execution Cycle is 341900 
    -Inverse Transformation Execution Time is 749 us （CPU Frequency:456MHz）
    512 Point FFT Test End
    --------------------------------------------------
    8: 1024 Point FFT Test 
    -Sampling Period:1s Sampling Frequency:1024Hz Frequency Resolution:1Hz
    Use DSPF_sp_cfftr2_dit Function
    -Forward Transformation Execution Cycle is 1182170 
    -Forward Transformation Execution Time is 2592 us （CPU Frequency:456MHz）
    Use DSPF_sp_fftSPxSP Function
    -Forward Transformation Execution Cycle is 677995 
    -Forward Transformation Execution Time is 1486 us （CPU Frequency:456MHz）
    Use DSPF_sp_icfftr2_dif Function
    -Inverse Transformation Execution Cycle is 1184016 
    -Inverse Transformation Execution Time is 2596 us （CPU Frequency:456MHz）
    Use DSPF_sp_ifftSPxSP Function
    -Inverse Transformation Execution Cycle is 673586 
    -Inverse Transformation Execution Time is 1477 us （CPU Frequency:456MHz）
    1024 Point FFT Test End
    --------------------------------------------------
    9: 2048 Point FFT Test 
    -Sampling Period:1s Sampling Frequency:2048Hz Frequency Resolution:1Hz
    Use DSPF_sp_cfftr2_dit Function
    -Forward Transformation Execution Cycle is 2586680 
    -Forward Transformation Execution Time is 5672 us （CPU Frequency:456MHz）
    Use DSPF_sp_fftSPxSP Function
    -Forward Transformation Execution Cycle is 1632443 
    -Forward Transformation Execution Time is 3579 us （CPU Frequency:456MHz）
    Use DSPF_sp_icfftr2_dif Function
    -Inverse Transformation Execution Cycle is 2583616 
    -Inverse Transformation Execution Time is 5665 us （CPU Frequency:456MHz）
    Use DSPF_sp_ifftSPxSP Function
    -Inverse Transformation Execution Cycle is 1623924 
    -Inverse Transformation Execution Time is 3561 us （CPU Frequency:456MHz）
    2048 Point FFT Test End
    --------------------------------------------------
    10: 4096 Point FFT Test 
    -Sampling Period:1s Sampling Frequency:4096Hz Frequency Resolution:1Hz
    Use DSPF_sp_cfftr2_dit Function
    -Forward Transformation Execution Cycle is 5724196 
    -Forward Transformation Execution Time is 12553 us （CPU Frequency:456MHz）
    Use DSPF_sp_fftSPxSP Function
    -Forward Transformation Execution Cycle is 3259229 
    -Forward Transformation Execution Time is 7147 us （CPU Frequency:456MHz）
    Use DSPF_sp_icfftr2_dif Function
    -Inverse Transformation Execution Cycle is 5686338 
    -Inverse Transformation Execution Time is 12470 us （CPU Frequency:456MHz）
    Use DSPF_sp_ifftSPxSP Function
    -Inverse Transformation Execution Cycle is 3250562 
    -Inverse Transformation Execution Time is 7128 us （CPU Frequency:456MHz）
    4096 Point FFT Test End
    --------------------------------------------------
    11: 8192 Point FFT Test 
    -Sampling Period:1s Sampling Frequency:8192Hz Frequency Resolution:1Hz
    Use DSPF_sp_cfftr2_dit Function
    -Forward Transformation Execution Cycle is 12557192 
    -Forward Transformation Execution Time is 27537 us （CPU Frequency:456MHz）
    Use DSPF_sp_fftSPxSP Function
    -Forward Transformation Execution Cycle is 7747971 
    -Forward Transformation Execution Time is 16991 us （CPU Frequency:456MHz）
    Use DSPF_sp_icfftr2_dif Function
    -Inverse Transformation Execution Cycle is 12414154 
    -Inverse Transformation Execution Time is 27224 us （CPU Frequency:456MHz）
    Use DSPF_sp_ifftSPxSP Function
    -Inverse Transformation Execution Cycle is 7745036 
    -Inverse Transformation Execution Time is 16984 us （CPU Frequency:456MHz）
    8192 Point FFT Test End
    --------------------------------------------------
    12: 16384 Point FFT Test 
    -Sampling Period:1s Sampling Frequency:16384Hz Frequency Resolution:1Hz
    Use DSPF_sp_cfftr2_dit Function
    -Forward Transformation Execution Cycle is 27328648 
    -Forward Transformation Execution Time is 59931 us （CPU Frequency:456MHz）
    Use DSPF_sp_fftSPxSP Function
    -Forward Transformation Execution Cycle is 15508781 
    -Forward Transformation Execution Time is 34010 us （CPU Frequency:456MHz）
    Use DSPF_sp_icfftr2_dif Function
    -Inverse Transformation Execution Cycle is 27357100 
    -Inverse Transformation Execution Time is 59993 us （CPU Frequency:456MHz）
    Use DSPF_sp_ifftSPxSP Function
    -Inverse Transformation Execution Cycle is 15523320 
    -Inverse Transformation Execution Time is 34042 us （CPU Frequency:456MHz）
    16384 Point FFT Test End
    --------------------------------------------------
    13: 32768 Point FFT Test 
    -Sampling Period:1s Sampling Frequency:32768Hz Frequency Resolution:1Hz
    Use DSPF_sp_cfftr2_dit Function
    -Forward Transformation Execution Cycle is 59078610 
    -Forward Transformation Execution Time is 129558 us （CPU Frequency:456MHz）
    Use DSPF_sp_fftSPxSP Function
    -Forward Transformation Execution Cycle is 35851587 
    -Forward Transformation Execution Time is 78621 us （CPU Frequency:456MHz）
    Use DSPF_sp_icfftr2_dif Function
    -Inverse Transformation Execution Cycle is 58662542 
    -Inverse Transformation Execution Time is 128645 us （CPU Frequency:456MHz）
    Use DSPF_sp_ifftSPxSP Function
    -Inverse Transformation Execution Cycle is 35901612 
    -Inverse Transformation Execution Time is 78731 us （CPU Frequency:456MHz）
    32768 Point FFT Test End
    --------------------------------------------------
    14: 65536 Point FFT Test 
    -Sampling Period:1s Sampling Frequency:65536Hz Frequency Resolution:1Hz
    Use DSPF_sp_fftSPxSP Function
    -Forward Transformation Execution Cycle is 71828025 
    -Forward Transformation Execution Time is 157517 us （CPU Frequency:456MHz）
    Use DSPF_sp_ifftSPxSP Function
    -Inverse Transformation Execution Cycle is 71958818 
    -Inverse Transformation Execution Time is 157804 us （CPU Frequency:456MHz）
    65536 Point FFT Test End
    --------------------------------------------------
    15: 131072 Point FFT Test 
    -Sampling Period:1s Sampling Frequency:131072Hz Frequency Resolution:1Hz
    Use DSPF_sp_fftSPxSP Function
    -Forward Transformation Execution Cycle is 163465645 
    -Forward Transformation Execution Time is 358477 us （CPU Frequency:456MHz）
    Use DSPF_sp_ifftSPxSP Function
    -Inverse Transformation Execution Cycle is 163730794 
    -Inverse Transformation Execution Time is 359058 us （CPU Frequency:456MHz）
    131072 Point FFT Test End

 

       以上是没有使能L1、L2缓存的测试结果。可以看到测试128K点正变换执行时间为358477us，逆变换执行时间为359058us。

       将main.c文件以下代码可选择是否打开缓存，如下图所示：

 

【学习分享】6 TMS320C6748开发板算法Demo例程演示（一）

图622

      

--------------------------- Cache Enabled ---------------------------

--------------------------------------------------

1: 8 Point FFT Test

-Sampling Period:1s Sampling Frequency:8Hz Frequency Resolution:1Hz

Use DSPF_sp_fftSPxSP Function

-Forward Transformation Execution Cycle is 340

-Forward Transformation Execution Time is 0 us （CPU Frequency:456MHz）

Use DSPF_sp_ifftSPxSP Function

-Inverse Transformation Execution Cycle is 452

-Inverse Transformation Execution Time is 0 us （CPU Frequency:456MHz）

8 Point FFT Test End

--------------------------------------------------

2: 16 Point FFT Test

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

Use DSPF_sp_fftSPxSP Function

-Forward Transformation Execution Cycle is 487

-Forward Transformation Execution Time is 1 us （CPU Frequency:456MHz）

Use DSPF_sp_ifftSPxSP Function

-Inverse Transformation Execution Cycle is 412

-Inverse Transformation Execution Time is 0 us （CPU Frequency:456MHz）

16 Point FFT Test End

--------------------------------------------------

3: 32 Point FFT Test

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

Use DSPF_sp_cfftr2_dit Function

-Forward Transformation Execution Cycle is 432

-Forward Transformation Execution Time is 0 us （CPU Frequency:456MHz）

Use DSPF_sp_fftSPxSP Function

-Forward Transformation Execution Cycle is 490

-Forward Transformation Execution Time is 1 us （CPU Frequency:456MHz）

Use DSPF_sp_icfftr2_dif Function

-Inverse Transformation Execution Cycle is 569

-Inverse Transformation Execution Time is 1 us （CPU Frequency:456MHz）

Use DSPF_sp_ifftSPxSP Function

-Inverse Transformation Execution Cycle is 620

-Inverse Transformation Execution Time is 1 us （CPU Frequency:456MHz）

32 Point FFT Test End

--------------------------------------------------

4: 64 Point FFT Test

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

Use DSPF_sp_cfftr2_dit Function

-Forward Transformation Execution Cycle is 941

-Forward Transformation Execution Time is 2 us （CPU Frequency:456MHz）

Use DSPF_sp_fftSPxSP Function

-Forward Transformation Execution Cycle is 873

-Forward Transformation Execution Time is 1 us （CPU Frequency:456MHz）

Use DSPF_sp_icfftr2_dif Function

-Inverse Transformation Execution Cycle is 1146

-Inverse Transformation Execution Time is 2 us （CPU Frequency:456MHz）

Use DSPF_sp_ifftSPxSP Function

-Inverse Transformation Execution Cycle is 1100

-Inverse Transformation Execution Time is 2 us （CPU Frequency:456MHz）

64 Point FFT Test End

--------------------------------------------------

5: 128 Point FFT Test

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

Use DSPF_sp_cfftr2_dit Function

-Forward Transformation Execution Cycle is 2083

-Forward Transformation Execution Time is 4 us （CPU Frequency:456MHz）

Use DSPF_sp_fftSPxSP Function

-Forward Transformation Execution Cycle is 1955

-Forward Transformation Execution Time is 4 us （CPU Frequency:456MHz）

Use DSPF_sp_icfftr2_dif Function

-Inverse Transformation Execution Cycle is 2470

-Inverse Transformation Execution Time is 5 us （CPU Frequency:456MHz）

Use DSPF_sp_ifftSPxSP Function

-Inverse Transformation Execution Cycle is 2364

-Inverse Transformation Execution Time is 5 us （CPU Frequency:456MHz）

128 Point FFT Test End

--------------------------------------------------

6: 256 Point FFT Test

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

Use DSPF_sp_cfftr2_dit Function

-Forward Transformation Execution Cycle is 4629

-Forward Transformation Execution Time is 10 us （CPU Frequency:456MHz）

Use DSPF_sp_fftSPxSP Function

-Forward Transformation Execution Cycle is 4037

-Forward Transformation Execution Time is 8 us （CPU Frequency:456MHz）

Use DSPF_sp_icfftr2_dif Function

-Inverse Transformation Execution Cycle is 5442

-Inverse Transformation Execution Time is 11 us （CPU Frequency:456MHz）

Use DSPF_sp_ifftSPxSP Function

-Inverse Transformation Execution Cycle is 4560

-Inverse Transformation Execution Time is 10 us （CPU Frequency:456MHz）

256 Point FFT Test End

--------------------------------------------------

7: 512 Point FFT Test

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

Use DSPF_sp_cfftr2_dit Function

-Forward Transformation Execution Cycle is 10285

-Forward Transformation Execution Time is 22 us （CPU Frequency:456MHz）

Use DSPF_sp_fftSPxSP Function

-Forward Transformation Execution Cycle is 8939

-Forward Transformation Execution Time is 19 us （CPU Frequency:456MHz）

Use DSPF_sp_icfftr2_dif Function

-Inverse Transformation Execution Cycle is 12026

-Inverse Transformation Execution Time is 26 us （CPU Frequency:456MHz）

Use DSPF_sp_ifftSPxSP Function

-Inverse Transformation Execution Cycle is 10065

-Inverse Transformation Execution Time is 22 us （CPU Frequency:456MHz）

512 Point FFT Test End

--------------------------------------------------

8: 1024 Point FFT Test

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

Use DSPF_sp_cfftr2_dit Function

-Forward Transformation Execution Cycle is 22572

-Forward Transformation Execution Time is 49 us （CPU Frequency:456MHz）

Use DSPF_sp_fftSPxSP Function

-Forward Transformation Execution Cycle is 16951

-Forward Transformation Execution Time is 37 us （CPU Frequency:456MHz）

Use DSPF_sp_icfftr2_dif Function

-Inverse Transformation Execution Cycle is 26562

-Inverse Transformation Execution Time is 58 us （CPU Frequency:456MHz）

Use DSPF_sp_ifftSPxSP Function

-Inverse Transformation Execution Cycle is 19995

-Inverse Transformation Execution Time is 43 us （CPU Frequency:456MHz）

1024 Point FFT Test End

--------------------------------------------------

9: 2048 Point FFT Test

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

Use DSPF_sp_cfftr2_dit Function

-Forward Transformation Execution Cycle is 49066

-Forward Transformation Execution Time is 107 us （CPU Frequency:456MHz）

Use DSPF_sp_fftSPxSP Function

-Forward Transformation Execution Cycle is 37885

-Forward Transformation Execution Time is 83 us （CPU Frequency:456MHz）

Use DSPF_sp_icfftr2_dif Function

-Inverse Transformation Execution Cycle is 58110

-Inverse Transformation Execution Time is 127 us （CPU Frequency:456MHz）

Use DSPF_sp_ifftSPxSP Function

-Inverse Transformation Execution Cycle is 44437

-Inverse Transformation Execution Time is 97 us （CPU Frequency:456MHz）

2048 Point FFT Test End

--------------------------------------------------

10: 4096 Point FFT Test

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

Use DSPF_sp_cfftr2_dit Function

-Forward Transformation Execution Cycle is 121294

-Forward Transformation Execution Time is 265 us （CPU Frequency:456MHz）

Use DSPF_sp_fftSPxSP Function

-Forward Transformation Execution Cycle is 91605

-Forward Transformation Execution Time is 200 us （CPU Frequency:456MHz）

Use DSPF_sp_icfftr2_dif Function

-Inverse Transformation Execution Cycle is 142558

-Inverse Transformation Execution Time is 312 us （CPU Frequency:456MHz）

Use DSPF_sp_ifftSPxSP Function

-Inverse Transformation Execution Cycle is 104487

-Inverse Transformation Execution Time is 229 us （CPU Frequency:456MHz）

4096 Point FFT Test End

--------------------------------------------------

11: 8192 Point FFT Test

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

Use DSPF_sp_cfftr2_dit Function

-Forward Transformation Execution Cycle is 401700

-Forward Transformation Execution Time is 880 us （CPU Frequency:456MHz）

Use DSPF_sp_fftSPxSP Function

-Forward Transformation Execution Cycle is 352584

-Forward Transformation Execution Time is 773 us （CPU Frequency:456MHz）

Use DSPF_sp_icfftr2_dif Function

-Inverse Transformation Execution Cycle is 497872

-Inverse Transformation Execution Time is 1091 us （CPU Frequency:456MHz）

Use DSPF_sp_ifftSPxSP Function

-Inverse Transformation Execution Cycle is 391087

-Inverse Transformation Execution Time is 857 us （CPU Frequency:456MHz）

8192 Point FFT Test End

--------------------------------------------------

12: 16384 Point FFT Test

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

Use DSPF_sp_cfftr2_dit Function

-Forward Transformation Execution Cycle is 875217

-Forward Transformation Execution Time is 1919 us （CPU Frequency:456MHz）

Use DSPF_sp_fftSPxSP Function

-Forward Transformation Execution Cycle is 1121040

-Forward Transformation Execution Time is 2458 us （CPU Frequency:456MHz）

Use DSPF_sp_icfftr2_dif Function

-Inverse Transformation Execution Cycle is 1230357

-Inverse Transformation Execution Time is 2698 us （CPU Frequency:456MHz）

Use DSPF_sp_ifftSPxSP Function

-Inverse Transformation Execution Cycle is 1040519

-Inverse Transformation Execution Time is 2281 us （CPU Frequency:456MHz）

16384 Point FFT Test End

--------------------------------------------------

13: 32768 Point FFT Test

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

Use DSPF_sp_cfftr2_dit Function

-Forward Transformation Execution Cycle is 3137966

-Forward Transformation Execution Time is 6881 us （CPU Frequency:456MHz）

Use DSPF_sp_fftSPxSP Function

-Forward Transformation Execution Cycle is 5362082

-Forward Transformation Execution Time is 11758 us （CPU Frequency:456MHz）

Use DSPF_sp_icfftr2_dif Function

-Inverse Transformation Execution Cycle is 3939588

-Inverse Transformation Execution Time is 8639 us （CPU Frequency:456MHz）

Use DSPF_sp_ifftSPxSP Function

-Inverse Transformation Execution Cycle is 5348305

-Inverse Transformation Execution Time is 11728 us （CPU Frequency:456MHz）

32768 Point FFT Test End

--------------------------------------------------

14: 65536 Point FFT Test

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

Use DSPF_sp_fftSPxSP Function

-Forward Transformation Execution Cycle is 24956639

-Forward Transformation Execution Time is 54729 us （CPU Frequency:456MHz）

Use DSPF_sp_ifftSPxSP Function

-Inverse Transformation Execution Cycle is 24975289

-Inverse Transformation Execution Time is 54770 us （CPU Frequency:456MHz）

65536 Point FFT Test End

--------------------------------------------------

15: 131072 Point FFT Test

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

Use DSPF_sp_fftSPxSP Function

-Forward Transformation Execution Cycle is 53716505

-Forward Transformation Execution Time is 117799 us （CPU Frequency:456MHz）

Use DSPF_sp_ifftSPxSP Function

-Inverse Transformation Execution Cycle is 53734869

-Inverse Transformation Execution Time is 117839 us （CPU Frequency:456MHz）

131072 Point FFT Test End

Test Finished!

 

       以上是使能L1、L2缓存的测试结果。可以看到测试128K点正变换执行时间为117799us，逆变换执行时间为117839us。

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