1c92945f59
Currently, several example dependencies rely on the fact that all registered components are added to the build, along with components specified in common requirements. This results in longer build times because even unused components must be built. Switch all examples to use idf_minimal_build to compile only the components actually required by the example. Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>
| Supported Targets | ESP32 | ESP32-S2 |
|---|
DAC Constant Example
(See the README.md file in the upper level 'examples' directory for more information about examples.)
Overview
This example shows how to play a piece of audio by DAC driver.
How to use the Example
Hardware Required
- A development board with ESP32 or ESP32-S2 SoC
- Note that some ESP32-S2 DevKits have LED on it which is connected to GPIO18 (same pin as DAC channel2), so the output voltage of DAC channel 1 can't go down due the this LED.
- An Audio Power Amplifier like
NS4150 - A speaker or earphone to play the audio
Configure the Project
This example uses the audio that stored in a buffer, which is put in audio_example_file.h. You can also create your own audio buffer by the python script generate_audio_file.py.
Build and Flash
Build the project and flash it to the board, then run monitor tool to view serial output:
idf.py -p PORT flash monitor
(Replace PORT with the name of the serial port to use.)
(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
You can see the following logs on the monitor:
I (277) dac audio: DAC audio example start
I (277) dac audio: --------------------------------------
I (287) dac audio: DAC initialized success, DAC DMA is ready
I (297) dac audio: Audio size 79512 bytes, played at frequency 16000 Hz
I (5137) dac audio: Audio size 79512 bytes, played at frequency 16000 Hz
I (9967) dac audio: Audio size 79512 bytes, played at frequency 16000 Hz
...
And meanwhile, you can hear the audio played every 1 second from the speaker or earphone.