支持乐鑫的esp32-box-lite开发板 (#288)

* add esp-box-lite

* 增加adc按钮支持，响应esp32box-lite的音量上下键

* 注释改进

* 只对esp-box-lite启用CONFIG_SOC_ADC_SUPPORTED

---------

Co-authored-by: cqm <cqm@97kid.com>

main/audio_codecs/box_audio_codec_lite.h

@@ -0,0 +1,37 @@
+#ifndef _BOX_AUDIO_CODEC_LITE_H
+#define _BOX_AUDIO_CODEC_LITE_H
+
+#include "audio_codec.h"
+
+#include <esp_codec_dev.h>
+#include <esp_codec_dev_defaults.h>
+
+class BoxAudioCodecLite : public AudioCodec {
+private:
+    const audio_codec_data_if_t* data_if_ = nullptr;
+    const audio_codec_ctrl_if_t* out_ctrl_if_ = nullptr;
+    const audio_codec_if_t* out_codec_if_ = nullptr;
+    const audio_codec_ctrl_if_t* in_ctrl_if_ = nullptr;
+    const audio_codec_if_t* in_codec_if_ = nullptr;
+    const audio_codec_gpio_if_t* gpio_if_ = nullptr;
+
+    esp_codec_dev_handle_t output_dev_ = nullptr;
+    esp_codec_dev_handle_t input_dev_ = nullptr;
+
+    void CreateDuplexChannels(gpio_num_t mclk, gpio_num_t bclk, gpio_num_t ws, gpio_num_t dout, gpio_num_t din);
+
+    virtual int Read(int16_t* dest, int samples) override;
+    virtual int Write(const int16_t* data, int samples) override;
+
+public:
+    BoxAudioCodecLite(void* i2c_master_handle, int input_sample_rate, int output_sample_rate,
+        gpio_num_t mclk, gpio_num_t bclk, gpio_num_t ws, gpio_num_t dout, gpio_num_t din,
+        gpio_num_t pa_pin, bool input_reference);
+    virtual ~BoxAudioCodecLite();
+
+    virtual void SetOutputVolume(int volume) override;
+    virtual void EnableInput(bool enable) override;
+    virtual void EnableOutput(bool enable) override;
+};
+
+#endif // _BOX_AUDIO_CODEC_LITE_H