unknown type name 'IRQn_Type'
Hello DDMW,
your problem seems quite simple. However I believe it is annoying to change many different names of peripherals etc.
IRQn_Type defines are written in the stm32f769xx.h in my case, generally in the stm32fXXXxx.h.
This is: STM32F7xx Interrupt Number Definition, according to the selected device in @ref Library_configuration_section.
Best regards
vt23