28 lines
1,012 B
Markdown
28 lines
1,012 B
Markdown
# SD Player
|
|
|
|
We just play a mp3 file (using the Arduino SD library) and output the result via I2S to an external DAC.
|
|
|
|
An ESP32 was used to test this sketch.
|
|
|
|
### 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)
|