example(ble): Update ble a2d_sink example

examples/bluetooth/a2dp_sink/main/main.c

@@ -54,14 +54,14 @@ void app_main()
 
     i2s_config_t i2s_config = {
 #ifdef CONFIG_A2DP_SINK_OUTPUT_INTERNAL_DAC
-        .mode = I2S_MODE_DAC_BUILT_IN,
+        .mode = I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN,
 #else
         .mode = I2S_MODE_MASTER | I2S_MODE_TX,                                  // Only TX
 #endif
         .sample_rate = 44100,
         .bits_per_sample = 16,                                              
         .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,                           //2-channels
-        .communication_format = I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB,
+        .communication_format = I2S_COMM_FORMAT_I2S_MSB,
         .dma_buf_count = 6,
         .dma_buf_len = 60,                                                      //
         .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1                                //Interrupt level 1
@@ -70,6 +70,7 @@ void app_main()
 
     i2s_driver_install(0, &i2s_config, 0, NULL);
 #ifdef CONFIG_A2DP_SINK_OUTPUT_INTERNAL_DAC
+    i2s_set_dac_mode(I2S_DAC_CHANNEL_BOTH_EN);
     i2s_set_pin(0, NULL);
 #else
     i2s_pin_config_t pin_config = {