@file       main.cpp
       @brief      SDR con ESP32 + TFT + PCM1808 + PCM5102 + SI5351

       @author     Jordi Gauchia

       @date       21/06/2022

       Pinout:
       TFT            MICRO SD       ENCODER          PCM1808            PCM5102         I2C
       -----------------------------------------------------------------------------------------------------
       VCC  3,3v      VCC  3,3v      VCC  3,3v        VCC   3,3v-5v      VCC   5v        SCL   GPIO22
       GND  GND       GND  GND       GND  GND         GND   GND          GND   GND       SCA   GPIO21
       LED  3,3v      CS   GPIO4     A    GPIO16      BCK   GPIO26       SCK   GPIO0
       MISO GPIO27    MISO GPIO27    B    GPIO17      OUT   GPIO35       BCK   GPIO26
       SCK  GPIO14    SCK  GPIO14    SW   GPIO19      LRC   GPIO33       DIN   GPIO25
       MOSI GPIO13    MOSI GPIO13                     SCK   GPIO0        LCK   GPIO33
       DC   GPIO15
       RST  GPIO32
       CS   GPIO2
       T_CS GPIO18


       Librerías:
       SI5351  :  https://github.com/etherkit/Si5351Arduino
       TFT     :  https://github.com/lovyan03/LovyanGFX
       ENCODER :  https://github.com/madhephaestus/ESP32Encoder
       FFT     :  https://github.com/kosme/arduinoFFT