I want to enable IRQ on GPIOA 0, there is my simple code: palSetPadMode(GPIOA, 0,PAL_MODE_INPUT_PULLUP | PAL_STM32_OSPEED_HIGHEST); palSetPadCallback(GPIOA, 0, cbIrqA0, NULL); palEnablePadEvent(GPIOA, 0, PAL_EVENT_MODE_FALLING_EDGE); but I got Assert in this line osalDbgAssert(((EXTI->RTSR & pad...