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Problem with STM32F746 : EXTI15_10_IRQ is constantly fired

Question asked by kimtys.juozas on Mar 29, 2018
Latest reply on May 3, 2018 by Nawres GHARBI

Hi, today I have observed and solved a problem when I started to develop my simple program for NUCLEO-F746ZG. A problem  was following: EXTI15_10_IRQHandler interrupt fired always - regardless of my changes in program. By observing system register SYSCFG content in my debugger, I have found, that content of SYSCFG always is zero, regardless of executing of the line LL_SYSCFG_SetEXTISource(LL_SYSCFG_EXTI_PORTC, LL_SYSCFG_EXTI_LINE13);

My code was generated by newest CubeMX with my selection USE_FULL_LL_DRIVER (without Ethernet and without USB support) and manually ported to Embitz. I have found solution - to add a line LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_SYSCFG);

Interestingly - why CubeMX do not add this line!

Best regards.