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1.3 KiB
1.3 KiB
Stream URL to I2S external DAC
We are reading a raw audio file from the Intenet and write the data to the I2S interface. The audio file must be available using 16 bit integers with 2 channels. I used a sampling rate of 8000.
Audacity might help you out here: export with the file name audio.raw as RAW signed 16 bit PCM and copy it to the SD card. In my example I was using the file audio.raw.
External DAC:
I am just using the default pins defined by the framework. However I could change them with the help of the config object. The mute pin can be defined in the constructor of the I2SStream - by not defining anything we use the default which is GPIO23
DAC | ESP32 |
---|---|
VCC | 5V |
GND | GND |
BCK | BCK (GPIO14) |
DIN | OUT (GPIO22) |
LCK | BCK (GPIO15) |
FMT | GND |
XMT | 3V (or another GPIO PIN which is set to high) |
- DMP - De-emphasis control for 44.1kHz sampling rate(1): Off (Low) / On (High)
- FLT - Filter select : Normal latency (Low) / Low latency (High)
- SCL - System clock input (probably SCL on your board).
- FMT - Audio format selection : I2S (Low) / Left justified (High)
- XMT - Soft mute control(1): Soft mute (Low) / soft un-mute (High)