i2s: add Internal DAC Output config

Author: redchenjs

main/Kconfig.projbuild

@@ -179,23 +179,53 @@ config SLEEP_KEY_PIN
 endmenu
 
 menu "Audio Configuration"
-config ENABLE_AUDIO_PROMPT
-    bool "Enable Audio Prompt"
-    default y
+choice AUDIO_OUTPUT
+    prompt "Audio Output"
+    default AUDIO_OUTPUT_EXTERNAL_I2S
     help
-        Select this to enable Audio Prompt.
+        Select to use Internal DAC or External I2S CODEC.
+
+    config AUDIO_OUTPUT_INTERNAL_DAC
+        bool "Internal DAC"
+    config AUDIO_OUTPUT_EXTERNAL_I2S
+        bool "External I2S CODEC"
+endchoice
+
+choice INTERNAL_DAC_MODE
+    prompt "Internal DAC Mode"
+    default INTERNAL_DAC_MODE_BOTH
+    depends on AUDIO_OUTPUT_INTERNAL_DAC
+    help
+        Select the Internal DAC Output Mode.
+
+    config INTERNAL_DAC_MODE_LEFT
+        bool "Left Channel Only (GPIO26)"
+    config INTERNAL_DAC_MODE_RIGHT
+        bool "Right Channel Only (GPIO25)"
+    config INTERNAL_DAC_MODE_BOTH
+        bool "Both Channel Enabled"
+endchoice
 
 config I2S_BCLK_PIN
     int "I2S BCLK Pin"
     default 22
+    depends on AUDIO_OUTPUT_EXTERNAL_I2S
 
 config I2S_LRCK_PIN
     int "I2S LRCK Pin"
     default 21
+    depends on AUDIO_OUTPUT_EXTERNAL_I2S
 
 config I2S_DOUT_PIN
     int "I2S DOUT Pin"
     default 19
+    depends on AUDIO_OUTPUT_EXTERNAL_I2S
+
+config ENABLE_AUDIO_PROMPT
+    bool "Enable Audio Prompt"
+    default y
+    help
+        Select this to enable Audio Prompt.
 endmenu
 
 config FIRMWARE_VERSION

main/src/chip/i2s.c

@@ -22,7 +22,11 @@ void i2s0_init(void)
 {
     esp_chip_info(&chip_info);
     i2s_config_t i2s_config = {
+#ifdef CONFIG_AUDIO_OUTPUT_INTERNAL_DAC
+        .mode = I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN,          // Only TX
+#else
         .mode = I2S_MODE_MASTER | I2S_MODE_TX,                                  // Only TX
+#endif
         .communication_format = I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB,
         .use_apll = chip_info.revision,                                         // Don't use apll on rev0 chips
         .sample_rate = i2s0_sample_rate,
@@ -32,14 +36,27 @@ void i2s0_init(void)
         .dma_buf_len = 60,
         .tx_desc_auto_clear = true                                              // Auto clear tx descriptor on underflow
     };
+    ESP_ERROR_CHECK(i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL));
+#ifdef CONFIG_AUDIO_OUTPUT_INTERNAL_DAC
+
+#ifdef CONFIG_INTERNAL_DAC_MODE_LEFT
+    ESP_ERROR_CHECK(i2s_set_dac_mode(I2S_DAC_CHANNEL_LEFT_EN));
+#elif defined(CONFIG_INTERNAL_DAC_MODE_RIGHT)
+    ESP_ERROR_CHECK(i2s_set_dac_mode(I2S_DAC_CHANNEL_RIGHT_EN));
+#else
+    ESP_ERROR_CHECK(i2s_set_dac_mode(I2S_DAC_CHANNEL_BOTH_EN));
+#endif
+    ESP_ERROR_CHECK(i2s_set_pin(0, NULL));
+
+#else
     i2s_pin_config_t pin_config = {
         .bck_io_num   = CONFIG_I2S_BCLK_PIN,
         .ws_io_num    = CONFIG_I2S_LRCK_PIN,
         .data_out_num = CONFIG_I2S_DOUT_PIN,
         .data_in_num  = -1                                                     // Not used
     };
-    ESP_ERROR_CHECK(i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL));
     ESP_ERROR_CHECK(i2s_set_pin(I2S_NUM_0, &pin_config));
+#endif // CONFIG_AUDIO_OUTPUT_INTERNAL_DAC
     ESP_LOGI(TAG, "i2s-0 initialized.");
 }