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about C5501 peripheral registers

Other Parts Discussed in Thread: TMS320VC5501

Currently, I use CCS5.5 to develop TMS320VC5501 code, but don't know how to check the peripheral register.

I use the following way to write register and read back:

   *(ioport UINT16 *)addr = val1;

  val2 =  *(ioport UINT16 *)addr;

however, val2 != val1, val2 is 0. 

CCS5.5 can view peripheral registers value?