Directly check pin for HIGH or LOW

[johnwasser]

@jannik_b

I also need it only for one pin, so to safe some time can I write like :
bool myState = !!(g_APinDescription[12].pPort → PIO_PDSR & g_APinDescription[12].ulPin); because Pin51 = PC12 and then I check the pin like: if(myState==true)?

The 'g_APinDescription' table is indexed by ARDUINO pin number so for Arduino Pin 51 you would use 51, not 12:
bool myState = !!(g_APinDescription[51].pPort->PIO_PDSR & g_APinDescription[51].ulPin);
And I already gave you the contents of that table entry (above) so you can avoid the two look-ups:
bool myState = !!(PIOC->PIO_PDSR & PIO_PC12);