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TMS320F28027F: About the call of OTP/ROM codes

Part Number: TMS320F28027F

hi, experts

     I am planning to programming OTP of 28027F with function codes, and call them in later use.

     In C2000 Drive library, I find two ways to call OTP/ROM codes as below:

     1. address pointer

     for example, Device_cal: #define Device_cal (void   (*)(void))0x3D7C80

     2.FAST ROM code

     for example, 2802xRevB_Fast_ONLY_ROMSymbols.lib  and so on.

now I am wondering:

   1. what's the content of 2802xRevB_Fast_ONLY_ROMSymbols.lib?  is it better in security?

   2. how to build myown .lib like this for OTP codes?

   3. how to allocate a specifically RAM area for variables used by OTP codes?

best wishes~~