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Original question:

Compiler/TMS320F28035: define variable in assembly and access the variable in C

Compiler/TMS320F28335: variable definition in Assembly

Susan Yang
Genius 9955 points

Part Number: TMS320F28335

Tool/software: TI C/C++ Compiler

Dear team,

I am using C/C++ and Assembly mixing programming with CCS 6.1. I defined variables in .asm file. These variables were not shared with C code.

But the variables declared in the assembly header file failed to compile normally into the Map file.

_TEST_1					.SET	140H
_TEST_2					.SET	141H
_TEST_3					.SET	142H
_TEST_4					.SET	143H
_TEST_5					.SET	144H
_TEST_6					.SET	145H
_TEST_7					.SET	146H
_TEST_8					.SET	147H
_TEST_9					.SET	148H
_TEST_10				.SET	149H

ps: 

If i use the .global declaration and the global variable declared externally in the C language header file, the declared variable and the corresponding address can be found in the Map file.

EC-F28335-BasicAndCProgram.rar

  • 0
    TI__Guru**** 252280 points

    Names such as _TEST_1 are absolute symbols.  Absolute symbols are not shown in the map file.  Though you do see them in the symbol table shown with the utility nm2000 ...

    % nm2000 BasicAndCProgramTest.out | findstr _TEST_
00008800 T B_TEST_FUN
00000140 A _TEST_1
00000149 a _TEST_10
00000149 a _TEST_10
0000014a a _TEST_11
...

    If you want to see an absolute symbol in the map file, you have to make it global.  You already do this for a few symbols in the source file BasicVar.h ...

    	.global _TEST_1
	.global _TEST_2
	.global _TEST_3
	.global _TEST_4

    Add the same entry for any other absolute symbol you want to see in the map file.

    Thanks and regards,

    -George