F28M35H52C: How can I run FPUmathtables from RAM?

Hi,

I would like to tell you two things here.

1. FPUmath tables are present in ROM.
2. FPUmath tables are present in the FastRTS library.

Now, if you simply want to run(access in this case) FPUtables from the RAM using your Flash, you can use the following like Brandon mentioned. This goes into your linker command file.

   FPUmathTables   : LOAD = FLASHB,
                     RUN = RAMLS5,
                     RUN_START(_FPUmathTablesRunStart),
                     LOAD_START(_FPUmathTablesLoadStart),
                     LOAD_SIZE(_FPUmathTablesLoadSize),
                     PAGE = 1

This simply loads all the Tables to Flash, and then copies into RAM. Now you can extern any table from your C code and it will be accessible to you. This method assumes that you are using Flash for running your program.

Now if you are running your program in RAM, then it's simple:

FPUmathTables   : > RAMGS3,    PAGE = 1

RAMGS3 is a global RAM section. You will need to see where your RAM section lies in the device and then define RAMGS3 appropriately.

Please let me know if you need further help.

Ritvik

Hi,

I understand that utilizing flash space isn't a good idea. I assumed that you ran your code either on Flash or on RAM, using a debugger.

I am not fully aware of the working of standalone mode. But I guess your concern with standalone mode is that it ignores Globals while initializing the space (I think so!!).

You can follow the second approach I suggested, but try putting your Tables in some other RAM section(other than global) which is not utilized and then run your program.

I am not sure if this will work because I need to test it myself. Only then can I give you a concrete solution.

Also, it would be great if you could send me a small sample code (or pseudo code) of what you are trying to in standalone mode. Probably I can help you better then.

Regards

Ritvik