ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 9.2.1 (GCC) 20200122
...
Guessed Channel Layout for Input Stream #0.0 : mono
Input #0, wav, from '.\sirius.wav':
Metadata:
...
encoder : Lavf58.29.100
Duration: 00:01:55.28, bitrate: 256 kb/s
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 Hz, mono, s16, 256 kb/s

// Global var
var TXRXbufffer[1000] ;
var RXbuff[1000];

func main()


   COM2_RX_pin(PA10);
   COM2_TX_pin(PA8);
   com2_Reset();
   com_SetBaud(COM2, 39700); // Parameter for the function is Baud/10
   com2_Init(RXbuff, BACKGROUND_SERIAL_COM_BUFFER_SIZE,0);
   com2_TXbuffer(TXRXbufffer,TX_COM_BUFFER_SIZE_ENCODED_FRAME, PA8);


   repeat

      // Some actions
      // Different for each app

      // Check if there is some data
      get_serial_messages();

      foreever
endfunc

func get_serial_messages()
   var singleData ;

   singleData := serin2();

   if(singleData >= 0)
       // Some processing
   endif

endfunc

// Global Variable
#constant TX_COM_BUFFER_SIZE_ENCODED_FRAME 1024
var TXbuff [TX_COM_BUFFER_SIZE_ENCODED_FRAME];



func main()

[Some inits]

com_Reset();
com_SetBaud(COM0, 39700); // Parameter for the function is Baud/10
com_Init(RXbuff, BACKGROUND_SERIAL_COM_BUFFER_SIZE,0);
com_TXbuffer(TXbuff,TX_COM_BUFFER_SIZE_ENCODED_FRAME*2,0); // Each array cell is 2 bytes

func sendSerialFrame(var cmd, var * dat, var dataLength)

var i := 0;
var checksum := 0;

var tst_start ;
var tst_stop ;


tst_start := sys_T();


// Make sure the previous frame is completely sent (equivalent to while(isDMABusy()) )
while(com_TXcount() > 0) ;


// Tell TXBuffer that we want to fill the buffer, but not send directly
com_TXbufferHold(ON);    // REMOVED WHEN TRYING NON-BUFFERED


// START CODE
serout(SERIAL_COMMUNICATION_START_CODE) ;

// Command (need to add an ESCAPE if required)
if((cmd == SERIAL_COMMUNICATION_START_CODE) | (cmd == SERIAL_COMMUNICATION_STOP_CODE) | (cmd == SERIAL_COMMUNICATION_ESCAPE_CODE))
     serout(SERIAL_COMMUNICATION_ESCAPE_CODE) ;
endif
serout(cmd) ;
checksum := cmd ;


// All data
// Using the same loop, compute the checksum.
// Using a while() is a bit faster than for() !!
while(i<dataLength)
     // If any of these byte needs an ESCAPE, add the ESCAPE to the encoded frame
     if((dat[i] == SERIAL_COMMUNICATION_START_CODE) | (dat[i] == SERIAL_COMMUNICATION_STOP_CODE) | (dat[i] == SERIAL_COMMUNICATION_ESCAPE_CODE))
          serout(SERIAL_COMMUNICATION_ESCAPE_CODE) ;
     endif
     serout(dat[i]) ;

     // The checksum does not take into account the START, STOP and ESCAPE
     checksum := checksum + dat[i] ;
     if(checksum > 255)
          checksum := (checksum - 256) ;
     endif

i++ ;
wend


// Checksum
serout(checksum) ;

// STOP CODE
serout(SERIAL_COMMUNICATION_STOP_CODE) ;

// Release TX buffer : all the data will be sent !
com_TXbufferHold(OFF);   // REMOVED WHEN TRYING NON-BUFFERED

// Display the execution duration
tst_stop := sys_T();
putstrXY(0,0,"Total: ");
putnumXY(50,0, DEC, tst_stop-tst_start);
endfunc

Connecting...
File "C:\Users\Josh Wardell\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.6.3/tools/upload.py", line 65, in <module>
esptool.main(cmdline)
File "C:/Users/Josh Wardell/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/tools/esptool\esptool.py", line 2890, in main
esp.connect(args.before)
File "C:/Users/Josh Wardell/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/tools/esptool\esptool.py", line 483, in connect
raise FatalError('Failed to connect to %s: %s' % (self.CHIP_NAME, last_error))
esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header
An error occurred while uploading the sketch
_