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TMS320F28069: About Flash_CallbackPtr Pointers Assignment

Part Number: TMS320F28069


In my application, I will use Flash2806x_API_wFPU_Library.lib to wirite or Erase the flash. This Lib provide a Function Pointer Flash_CallbackPtr, but I can't assign value for it. 

At first, I assigned the address of FEE_Wdg to Flash_CallbackPtr, but it is invalid. So I write below test code.

The fptr can be assigned avalue, but the Flash_CallbackPtr can’t.  And I found the  assembly is same. 

So my question is why Flash_CallbackPtr Pointers  can't assignment. Thx