Microphone Record/Capture Test using ESP-32 with AKM7755 Audio Codec

Here's a Microphone record/Capture Test using ESP-32 with AKM7755 Audio Codec.The recording is done at 48kHz, Stereo using AKM7755 which transfers the audio captured using I2S over DMA for 16-bit PCM data which is written to an SDCard RAW file using SPI over DMA. This RAW File is attached to a WAV file header and subsequently a Wav file is created in the SDCard. The RAW file is deleted and the WAV file is played back when user presses Record/Play button.