Hi ALEX-KIR,
Please try this connection:
| Tone2 | Luckfox Pico Max | Note |
|---|---|---|
| I2S_BCLK(PIN29) | I2S_SCLK | - |
| I2S_MCLK(PIN30) | I2S_MCLK | - |
| I2S_SDI(PIN31) | I2S_SDO0 | - |
| I2S_LRCK(PIN32) | I2S_LRCK | - |
| I2S_DECT(PIN35) | - | Connect to Tone2 PWR_EN (PIN38) |
| USB_DECT(PIN37) | - | Connect to Tone2 GND(PIN40) |
| GND(PIN21) | GND | - |