catching up (trying to) wiht CSpot

components/spotify/cspot/bell/src/sinks/esp/InternalAudioSink.cpp

@@ -0,0 +1,33 @@
+#include "InternalAudioSink.h"
+#include "driver/i2s.h"
+
+InternalAudioSink::InternalAudioSink()
+{
+    softwareVolumeControl = true;
+    usign = true;
+
+    i2s_config_t i2s_config = {
+        .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN),                                  // Only TX
+        .sample_rate = (i2s_bits_per_sample_t)44100,
+        .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
+        .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
+        .communication_format = (i2s_comm_format_t)I2S_COMM_FORMAT_STAND_I2S,
+        .intr_alloc_flags = 0,//ESP_INTR_FLAG_LEVEL1
+        .dma_buf_count = 6,
+        .dma_buf_len = 512,
+        .use_apll = true,
+        .tx_desc_auto_clear = true, //Auto clear tx descriptor on underflow
+        .fixed_mclk=-1
+    };
+
+    //install and start i2s driver
+    i2s_driver_install((i2s_port_t)0, &i2s_config, 0, NULL);
+    //init DAC
+    i2s_set_dac_mode(I2S_DAC_CHANNEL_BOTH_EN);
+
+    startI2sFeed();
+}
+
+InternalAudioSink::~InternalAudioSink()
+{
+}