Fix the M5Stack Node example.

examples/M5Stack.ino

@@ -16,9 +16,8 @@
 #define I2S_DOUT     2
 #define I2S_DIN     34
 
-/* M5Stack WM8978 MCLK gpio number and frequency */
+/* M5Stack WM8978 MCLK gpio number */
 #define I2S_MCLKPIN  0
-#define I2S_MFREQ  (24 * 1000 * 1000)
 
 WM8978 dac;
 Audio audio;
@@ -29,12 +28,13 @@ void setup() {
     ESP_LOGE(TAG, "Error setting up dac. System halted");
     while (1) delay(100);
   }
-  /* Setup wm8978 MCLK on gpio - for example M5Stack Node needs a 24Mhz clock on gpio 0 */
-  dac.setPinClockFreq(I2S_MCLKPIN, I2S_MFREQ);
 
   /* Setup wm8978 I2S interface */
   audio.setPinout(I2S_BCK, I2S_WS, I2S_DOUT, I2S_DIN);
 
+  /* Setup wm8978 MCLK on gpio - for example M5Stack Node needs a 24Mhz clock on gpio 0 */
+  audio.i2s_mclk_pin_select(I2S_MCLKPIN);
+
   WiFi.begin("xxx", "xxx");
   while (!WiFi.isConnected()) {
     delay(10);