USER_BUTTON_SYSCFG_SET_EXTI is only used within WWDG_RefreshUntilUserEvent.
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USER_BUTTON_SYSCFG_SET_EXTI macro
Syntax
#define USER_BUTTON_SYSCFG_SET_EXTI() do { \
LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_SYSCFG); \
LL_SYSCFG_SetEXTISource(LL_SYSCFG_EXTI_PORTC, LL_SYSCFG_EXTI_LINE13); \
} while(0)