CLA Math Table RAM Load

Cem Koose

Hi,

I'm trying to load CLA math tables to RAM. I have CLA functions perfectly works and compiled using "cla1_math_library_datarom.lib".

I want to use "cla1_math_library.lib" and load the tables to RAM for faster execution rate.

in main() I have;

    extern uint32_t CLA1mathTablesRunStart, CLA1mathTablesLoadStart, CLA1mathTablesLoadSize;
   memcpy((uint32_t *)&CLA1mathTablesRunStart, (uint32_t *)&CLA1mathTablesLoadStart,
   (uint32_t)&CLA1mathTablesLoadSize); //Use with "2837xD_FLASH_CLA_C_lnk.cmd"

and in linker cmd. file;
...

#if !(CLA_MATH_TABLES_IN_ROM)
   CLA1mathTables   : > RAMLS1,    PAGE = 1
#endif

#if !(CLA_MATH_TABLES_IN_ROM)
   //Load tables to Flash and copy over to RAM
   /* CLA Math Tables in ROM*/
   CLA1mathTables   : LOAD = FLASHN,   //FLASHN
                       RUN = RAMLS1, //RAMGS5
                       RUN_START(_CLA1mathTablesRunStart),
                       LOAD_START(_CLA1mathTablesLoadStart),
                       LOAD_SIZE(_CLA1mathTablesLoadSize),
                       PAGE = 1, ALIGN(4)
#endif //CLA_MATH_TABLES_IN_ROM

...

When I compile project using "cla1_math_library.lib" there is no error and my functions works well. When I examine the .map file I see that "cla1_math_library.lib" is used for linking CLAdiv.obj files. But the map files show FLASHN is empty, also in CCS memory allocation tool show in RAMLS1, CLA1MathTables empty. I'm not sure tables are loaded correctly to RAM, but CLA and my functions works.

How can I verify tables are loaded into RAM?

Another Question, "CLA-MATH-LIB-UG" says "Some devices, like the F2837x and F2805x, have all the lookup tables in a special data ROM (CLA
Data ROM)". I'm using F28377D, where the CLA tables are located, can we read it using CPU and view through CCS memory browser?

over 8 years ago

0 Vishal_Coelho over 8 years ago

TI__Mastermind 20850 points

Hi,

CEM KOOSE said:
How can I verify tables are loaded into RAM?

Make sure CLA_MATH_TABLES_IN_ROM is not defined in either your linker command file or int eh project properties C2000 Linker->command file preprocessing-> --define

In the library examples look at "acos" it has a FLASH_NOROM build configuration that you can use. Once you build it check the map file you should see something liek this

CLA1mathTables 
*          1    000bc000    00000184     RUN ADDR = 0000a000
                  000bc000    00000184     cla1_math_library.lib : CLAacosineTable.obj (CLA1mathTables)

0 Cem Koose over 8 years ago in reply to Vishal_Coelho

Intellectual 880 points

Hi Mr Coelho,

CLA_MATH_TABLES_IN_ROM is not defined and I see below lines in map file.

00088f24 00000020 cla1_math_library.lib : CLAdiv.obj (Cla1Prog)

CLA1mathTables
* 1 00008800 00000000 UNINITIALIZED

Why it says "UNINITIALIZED"?

0 Vishal_Coelho over 8 years ago in reply to Cem Koose

TI__Mastermind 20850 points

Division does not use any math tables so they arent pulled in. Try using cos or sin and see if the table gets pulled in

0 Cem Koose over 8 years ago in reply to Vishal_Coelho

Intellectual 880 points

Thanks Mr Coelho, when I use CLAsin(), table pulled in map file. Also CCS memory allocation tool shows in RAMLS1 CLA1mathTables are filled but FLASHN is still empty. My guess is the tables are loaded from ROM to RAMLS1 instead of FLASHN to RAMLS1.

0 Vishal_Coelho over 8 years ago in reply to Cem Koose

TI__Mastermind 20850 points

No that shouldnt be the case. In my original response that showed the map file you see the origin is 0xbc000 which is FLASHB. If i were to look at FLASHB

  FLASHB                000bc000   00002000  00000184  00001e7c  RWIX

The second highlighted portion shows that some memory is used. this is the table. You should see something similar for FLASHN

0 Cem Koose over 8 years ago in reply to Vishal_Coelho

Intellectual 880 points

I remove the below lines from linker file and now I see that some of the flashN is used.
Thanks, regards...

/*#if !(CLA_MATH_TABLES_IN_ROM)
CLA1mathTables : > RAMLS1, PAGE = 1
#endif*/

C2000™︎ microcontrollers

C2000 microcontrollers forum

CLA Math Table RAM Load