STM32F103 external interrupts does not work

Does anybody now how to implement attachInterrupt routine in a sketch using a STM32F103 microprocessor ? I am trying with regular way such attachInterrupt(PA15, touched, FALLING) but it does not work. I have also tryied attachInterrupt(digitalPinToInterrupt(PA15), touched, FALLING) but it does not work too. I am using the PA15 pin of STM32F103 to interrupt at falling edge... Any help will be deeply appreciated.

Are you familiar with the low level routines or hal routines ? They are the underlying drivers that the arduino code calls. I know there is "Rogers" core and the newer ST supported core. Unfortunatly the STM32duino site is no longer around. That is where you would find the most help.