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difference in assembler behavior using TI tools v15.12.2LTS between F28069 and F28379

SpencerM
Intellectual 310 points

Hello all,

I'm trying to port some assembly running on a Piccolo 069 to a Delfino 379 using the same version of the compiler tools, ( v15.12.2LTS) on CCS 6.1.0

I've isolated the problem with the following sample code:

B_3             .set    0008h   ; Bit Mask to set bit 3
B_2             .set    0004h   ; Bit Mask to set bit 2
B_1             .set    0002h   ; Bit Mask to set bit 1
B_0             .set    0001h   ; Bit Mask to set bit 0

B4                .set    0010h    ; Bit Mask to set bit 4
B3                .set    0008h    ; Bit Mask to set bit 3    ERROR ON THIS LINE
B2              .set    0004h   ; Bit Mask to set bit 2       ERROR ON THIS LINE
B1              .set    0002h   ; Bit Mask to set bit 1       ERROR ON THIS LINE
B0              .set    0001h   ; Bit Mask to set bit 0       ERROR ON THIS LINE

   .def     _Sample_code
    .text

 .c28_amode
_Sample_code:
    SETC     SXM                                       ;
    MOV      AH,            AL
    SUB      AH,            *+XAR4[6]                  ;
    MOV      *+XAR4[6],     AL                         ;
    MOV      ACC,           AH<<16                     ;
    LRETR

When I assemble the file for the 069, it compiles without a problem.

When I assemble the file for the 379, I get eight errors, two each for the lines indicated above.

The errors I get are:

1) Invalid mnemonic specification

2) Only labels and comments may begin in the first column. Make sure that the label name is not a reserved keyword.

I've searched the online assembler tools user guide for reserved/keywords, and didn't find any listed restrictions on the symbols B0, B1, B2, or B3

Am I missing something?

Thanks,

Spencer

  • 0
    TI__Mastermind 20850 points

    Hi Spencer,

    Im pretty sure this is because of the VCU. The 069 has a VCU-type 0 (VCU-0) while the 2837x has a VCU-type 1 (commonly known as VCU-2). Now on the VCU-2 there are new instructions that can operate on each byte of a VRx register; these instructions weren't on the VCU-0. The operands take the form VRx.By, x=0:7, y=0:3

    So VR1.B2 is byte 2 of the VR1 register. So B0, B1, B2 and B3 are reserved for use in a VCU assembly instruction only and thats why its complaining its reserved. I dont know if its reserved only if the VCU support is turned off -  you can try turning of the --vcu_support and see if its still reserved...but i think it will probably be best to rename them. 

  • 0 in reply to Vishal_Coelho
    TI__Mastermind 20850 points
    Correction: " I dont know if its reserved only if the VCU support is turned *ON* - you can try turning *OFF* the --vcu_support and see if its still reserved...but i think it will probably be best to rename them"