FFT demo

[中文]

1、Function overview

FFT demo mainly includes FFT and IFFT function tests, which can convert digital signals between time domain and frequency domain, and are mainly used for filtering processing of digital signals such as audio images.

2、Code path

demo path: \components\demos\media\audio\fft

For the detailed description of the API interface of the FFT module, please refer to the same webpage: /api-reference/multi_media/bk_fft.html

3、Cli command introduction

The commands supported by the demo are as follows:

Command	Description
cpu1 fft_fft_test {start|stop}	run fft test demo
cpu1 fft_ifft_test {start|stop}	run ifft test demo

The macro configuration that the demo runs depends on:

Name	Description	File	value
CONFIG_FFT	Configure FFT function enable	\properties\soc\bk7256_cp1\bk7256_cp1.defconfig	y
CONFIG_FFT_TEST	configuration demo enable	\properties\soc\bk7256_cp1\bk7256_cp1.defconfig	y

Demo runs dependent libraries and drivers:

• FFT fft driver

4、Demo introduction

The steps performed by the demo are as follows:

1.Execute the fft test

• Uart sends AT command cpu1 fft_fft_test start to execute fft function test

2.stop fft test

• Uart sends AT command cpu1 fft_fft_test stop to stop executing the fft function test

3.perform ifft test

• Uart sends AT command cpu1 fft_ifft_test start to execute ifft function test

4.stop ifft test

• Uart sends AT command cpu1 fft_ifft_test stop to stop executing ifft function test

Execute the test command, the workflow of the case is shown in the following figure:

Figure 1. fft demo flow chart

5、Detailed configuration and description

Important

Precautions:

• 1.Only one of the FFT and IFFT functions can be selected for execution at the same time;