kopia lustrzana https://github.com/espressif/esp-idf
103 wiersze
3.5 KiB
Markdown
103 wiersze
3.5 KiB
Markdown
| Supported Targets | ESP32 | ESP32-S3 |
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| ----------------- | ----- | -------- |
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# I2S Digital Microphone Recording 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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In this example, we record a sample audio file captured from the digital MEMS microphone on the I2S peripheral using PDM data format.
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The audio is recorded into the SDCard using WAVE file format.
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| Audio Setting | Value |
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|:---:|:---:|
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| Sample Rate |44100 Hz|
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| Bits per Sample |16 bits|
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## How to Use Example
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### Hardware Required
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* A development board with ESP32 or ESP32S3 SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
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* A USB cable for power supply and programming
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* A digital microphone (SPK0838HT4H PDM output was used in this example)
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The digital PDM microphone is connected on the I2S interface `I2S_NUM_0`.
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The default GPIO configuration is the following:
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|Mic | GPIO |
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|:---------:|:------:|
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| PDM Clock | GPIO4 |
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| PDM Data | GPIO5 |
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The SDCard is connected using SPI peripheral.
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| SPI | SDCard | GPIO |
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|:----:|:------:|:------:|
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| MISO | DAT0 | GPIO17 |
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| MOSI | CMD | GPIO16 |
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| SCLK | CLK | GPIO18 |
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| CS | CD | GPIO19 |
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To change the GPIO configuration, see the `Example Configuration` from the menuconfig.
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### Configure the Project
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```
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idf.py menuconfig
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```
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In the `Example Configuration` menu:
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* Use `SDCard Configuration` to assign the SPI peripheral GPIOs.
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* Use `I2S MEMS MIC Configuration` to assign the I2S peripheral GPIOs and audio settings.
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Optional: If you need, change the other options according to your requirements.
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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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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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* [ESP-IDF Getting Started Guide on ESP32](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/get-started/index.html)
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## Example Output
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Running this example, you will see the Bits per Sample changes every 5 seconds after you have run this example. You can use `i2s_set_clk` to change the Bits per Sample and the Sample Rate. The output log can be seen below:
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```
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I (361) pdm_rec_example: PDM microphone recording Example start
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I (371) I2S: DMA Malloc info, datalen=blocksize=2048, dma_desc_num=64
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I (401) I2S: APLL: Req RATE: 44100, real rate: 88199.977, BITS: 16, CLKM: 1, BCK_M: 8, MCLK: 22579194.000, SCLK: 2822399.250000, diva: 1, divb: 0
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I (431) I2S: APLL: Req RATE: 44100, real rate: 88199.977, BITS: 16, CLKM: 1, BCK_M: 8, MCLK: 22579194.000, SCLK: 2822399.250000, diva: 1, divb: 0
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I (431) pdm_rec_example: Initializing SD card
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I (431) pdm_rec_example: Using SDMMC peripheral
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I (441) gpio: GPIO[13]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
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Name: USD
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Type: SDHC/SDXC
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Speed: 20 MHz
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Size: 3813MB
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I (481) pdm_rec_example: Starting recording for 60 seconds!
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I (481) pdm_rec_example: Opening file
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I (60451) pdm_rec_example: Recording done!
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I (60471) pdm_rec_example: File written on SDCard
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I (60471) pdm_rec_example: Card unmounted
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```
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## Troubleshooting
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* Program upload failure
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* Hardware connection is not correct: run `idf.py -p PORT monitor`, and reboot your board to see if there are any output logs.
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* The baud rate for downloading is too high: lower your baud rate in the `menuconfig` menu, and try again.
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For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.
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