MSPM0G3507: Systick stuff

I have set the systick interrupt well,and bind the Systick_Handler() function,but it dosent work properly.When I start to debug the program,it even didnt enter into the interrupt.The main() works well,and the clock source is set like this picture below.I can't find the problem. 

Daniel：

您好

已经收到了您的案例，调查需要些时间，感谢您的耐心等待

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Alice：

您好，

      请参考systick_periodic_timer