I compiled and uploaded the I2S example from ESP-IDF to my ESP32 board, with the only change that I wanted to use pin 27 for data
out for easier wiring:
Code: Select all
-#define I2S_DO_IO (GPIO_NUM_22)
+#define I2S_DO_IO (GPIO_NUM_27)
Unfortunately, I don't now which is which.
The FFT analysis also seems to suggest that there is a triangle wave in there somewhere:
Lastly, I have tried the DAC with a Raspberry PI, where it does work as expected.