audio code board PROTOとraspberry pi 3との接続 proto raspberry----- -----sck(I2S_SCK) -> rpi 12 GPIO 18 / PCM_CLKmiso(I2S_DOUT) -> rpi 38 GPIO 20 / PCM_DINmosi(I2S_DIN) -> rpi 40 GPIO 21 / PCM_DOUTadcl+dacl(I2S_LRCK) -> rpi 35 //both proto…