load register with 32-bit value when compiling for L138

Steve Dear

Hi,

I am trying to load a register with a 32 bit value. I don't have trouble doing this with IAR, but when trying to build with TI code composer 5.2 I find the LDR command is not allowed.

I tried MOVW to see if I could move half the value and the compiler tells me that it will only allow that instruction for v7, and the 926 is a 5e core.

Please could someone let me know what command I need to use?

Thanks

over 13 years ago

0 AartiG over 13 years ago

TI__Guru**** 173310 points

What is the exact instruction you are trying to use and what is the error generated by the compiler? Also what are your build options? (you can copy and paste the output of the CCS build console).

0 Steve Dear over 13 years ago in reply to AartiG

Intellectual 340 points

At the top of the file I have the following constant decalred:

AINTC_HIER .set 0xFFFEF500 ; Host Interrupt Enable Register

Later on in the file I need to pass this value into register r2, in IAR assembler the following instruction was allowed and worked:

LDR r2, =AINTC_HIER

TMS470 does not like this, and it looks like a move command is required, but I can only find examples of MOV which is for 8-bit values. The MOVW variant is v7 only so I am not sure what I can use.

0 Steve Dear over 13 years ago in reply to Steve Dear

Intellectual 340 points

Some additional info: This is the code affected with the first two lines being alternate attempts to get pass the assembler error.

   LDR    r2, #AINTC_HIER            ; Disable Host interrupts LDR not legal operand in this instance
   MOVW r2, #0xF500                 ; not allowed with a 5e core
   MOV    r1, #0x0
   STR    r1,[r2]

0 AartiG over 13 years ago in reply to Steve Dear

TI__Guru**** 173310 points

I could get the following to build. Would this work for you?

AINTC_HIER .word 0xFFFEF500
LDR r2, AINTC_HIER

Some related threads that may help:

http://e2e.ti.com/support/development_tools/compiler/f/343/t/40580.aspx
http://e2e.ti.com/support/development_tools/compiler/f/343/p/88870/309567.aspx#309567

0 Steve Dear over 13 years ago in reply to AartiG

Intellectual 340 points

Thanks for the update, I had just downloaded the examples for the L138 from TI's site and I found an instance of register definitions showing the use of .word.

It looks like I was using a define directive (.set) that only sets up 8-bit values.

TMS470 assembler is new to me so converting my IAR assembler code is going a bit slow. Thanks for your help, I am now able to move on.

Steve

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load register with 32-bit value when compiling for L138