lin for bluepill stmf103

[wchpikus]

Hello.
Is it possible to add lin for this mcu?
Arduino report error compile with names.

[wchpikus]

i have problem to compile it with errors:

C:\Users\W77FE~1.CHM\AppData\Local\Temp\arduino_build_248717\sketch\lin_stack.cpp: In member function 'int lin_stack::serial_pause(int)':
lin_stack.cpp:230:5: error: 'GPIO13' was not declared in this scope
PORTA->PIO_PER = PIO_PA13; // enable PIO register
^
lin_stack.cpp:230:23: error: 'PIO_PA13' was not declared in this scope
PORTA->PIO_PER = PIO_PA13; // enable PIO register
^
lin_stack.cpp:231:5: error: 'PORTA' was not declared in this scope
PORTA->PIO_OER = PIO_PA13; // enable PA13 as output
^
lin_stack.cpp:238:5: error: 'PORTA' was not declared in this scope
PORTA->PIO_PER = PIO_PA11; // enable PIO register
^
lin_stack.cpp:238:22: error: 'PIO_PA11' was not declared in this scope
PORTA->PIO_PER = PIO_PA11; // enable PIO register
^
exit status 1
'GPIO13' was not declared in this scope