Pointing Cortex M3 Systick timer to your fonction using Cylib will not work if you use SysTick_IRQn definition from core_cm3_psoc5.h
CyIntSetSysVector(SysTick_IRQn,YourFonction) this do not work.
Because SysTick_IRQn is define as -1 in core_cm3_psoc5.h
Systick vector number is 15.
So this works: CyIntSetSysVector(15,YourFonction);
One more thing, SysTick_Config() do not specify which clock is used.
In my case because I used USB, I deducted that the clock used was 48MHz.
So to get 1ms ticks I used :
I guess default clock is one of the clock at 48Mhz, but when I consulted the documentation, I was told that the clock for systick would be ILO.
Maybe I did not use the proper definition, but it is at least confusing.
It should be clear which clock is used and what definition we should used.
I proposed that CyLib should be modified so that CyIntSetSysVector works with SysTick_IRQn definition from core_cm3_psoc5.h
I also proposed that SysTick_Config should be modified to include clock selection if it is possible or to specify which clock is used.