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Basic Math Example

(See the README.md file in the upper level 'examples' directory for more information about examples.)

This example demonstrates how to use basic math functions from esp-dsp library. Example does the following steps:

  1. Initialize the library
  2. Initialize input signals with 1024 samples
  3. Apply window to input signal by standard C loop.
  4. Calculate FFT for 1024 complex samples and show the result
  5. Show results on the plots
  6. Apply window to input signal by basic math functions dsps_mul_f32 and dsps_mulc_f32.
  7. Calculate FFT for 1024 complex samples
  8. Show results on the plots

How to use example

Hardware required

This example does not require any special hardware, and can be run on any common development board.

Configure the project

Under Component Config ---> DSP Library ---> DSP Optimization, it's possible to choose either the optimized or ANSI implementation, to compare them.

Build and flash

Build the project and flash it to the board, then run monitor tool to view serial output (replace PORT with serial port name):

idf.py -p PORT flash monitor

(To exit the serial monitor, type Ctrl-].)

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Example output

Here is an typical example console output.

I (132) main: *** Start Example. ***
I (132) main: *** Multiply tone signal with Hann window by standard C loop. ***
I (152) view: Data min[432] = -173.749878, Data max[205] = 23.849705
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I (162) view: Plot: Length=512, min=-120.000000, max=40.000000
I (162) main: *** Multiply tone signal with Hann window by esp-dsp basic math functions. ***
I (162) view: Data min[432] = -173.749878, Data max[205] = 23.849705
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I (172) view: Plot: Length=512, min=-120.000000, max=40.000000
I (172) main: *** End Example. ***