fix auto detect speed transmitter buf

fix bug with comparator, add changing threshold and changing transmitting freq in interpreter

Add define statement to remove clashes of PD0 between edgedebug and AUDIO DAC

Use Input Capture for Falling edge and Rising Edge instead

add helix source code into project

checkpoint before starting audio output

add FAT32 FileSystem

Add DAC module as AUDIOOUT

make oversampling to be dynamic instead of a constant

fix receiver using oversampling factor properly