15b4baba28
- minimize RAM usage of all components - use both IRAM and DRAM in player component so we can buffer up to 1s on modules without SPI RAM - support fragemented pcm chunks so we can use all available RAM if there isn't a big enough block available but still enough HEAP - reinclude all components from jorgen's master branch - add custom i2s driver to get a precise timing of initial sync - change wrong usage of esp_timer for latency measurement of snapcast protocol - add player component
84 lines
3.6 KiB
Markdown
84 lines
3.6 KiB
Markdown
# Basic Math Example
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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This example demonstrates how to use basic math functions from esp-dsp library. Example does the following steps:
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1. Initialize the library
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2. Initialize input signals with 1024 samples
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3. Apply window to input signal by standard C loop.
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4. Calculate FFT for 1024 complex samples and show the result
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5. Show results on the plots
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6. Apply window to input signal by basic math functions dsps_mul_f32 and dsps_mulc_f32.
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7. Calculate FFT for 1024 complex samples
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8. Show results on the plots
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## How to use example
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### Hardware required
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This example does not require any special hardware, and can be run on any common development board.
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### Configure the project
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If using Make based build system, run `make menuconfig` and set serial port under Serial Flasher Options.
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If using CMake based build system, no configuration is required.
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Also, under Component Config ---> DSP Library ---> Optimization for ESP32, it's possible to select optimized or ansi implementation to compare.
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### Build and flash
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Build the project and flash it to the board, then run monitor tool to view serial output:
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```
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make -j4 flash monitor
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```
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Or, for CMake based build system (replace PORT with serial port name):
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```
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idf.py -p PORT flash monitor
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```
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Example output
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Here is an typical example console output.
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```bash
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I (132) main: *** Start Example. ***
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I (132) main: *** Multiply tone signal with Hann window by standard C loop. ***
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I (152) view: Data min[432] = -173.749878, Data max[205] = 23.849705
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________________________________________________________________
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0123456789012345678901234567890123456789012345678901234567890123
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I (162) view: Plot: Length=512, min=-120.000000, max=40.000000
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I (162) main: *** Multiply tone signal with Hann window by esp-dsp basic math functions. ***
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I (162) view: Data min[432] = -173.749878, Data max[205] = 23.849705
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________________________________________________________________
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0123456789012345678901234567890123456789012345678901234567890123
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I (172) view: Plot: Length=512, min=-120.000000, max=40.000000
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I (172) main: *** End Example. ***
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```
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