AURIX™ Forum Discussions

[User19424]

Hello
I am having trouble reading the A11 Register.
I tried:

 __mfcr(CPU_A11)
(&CPU0_A11)->B.ADDR
 *((unsigned int *)&CPU0_A11)

//Also Tried with inline assembly
int *res;
 __asm__ volatile ("mov.aa %0, %%a11": "=a" (res) : :"a11");
 return res;

But none seem to work. Can someone please help me?
Thank you very much.

[NeMa_4793301]

This didn't work?

int res;
res = __mfcr( CPU_A11 );

What value did you get? What were you expecting?

[User19424]

UC_wrangler wrote:
This didn't work?

int res;
res = __mfcr( CPU_A11 );

What value did you get? What were you expecting?

I get 0
I was expecting to get the address located in a11, but the mnemonic places 0 into d15, instead of the expected address.

I noticed from reading the documentation that __mfcr is only intended for CSFR Registers. Could this be why it doesn't work for General Purpose ones?

[NeMa_4793301]

I think you're right about __mfcr and general registers - coffee hasn't kicked in yet :).

How about this:

	register int res asm("d0");
	__asm__ ("mov.d %d0, %a11" );

[User19424]

UC_wrangler wrote:
I think you're right about __mfcr and general registers - coffee hasn't kicked in yet :).

How about this:

	register int res asm("d0");
	__asm__ ("mov.d %d0, %a11" );

I may also be making a silly mistake, but doing this gives me

syntax error - token ";" inserted before "asm"

Is there something I have to import for this to work properly?

Thought maybe a "=" was missing but that just gives me linker errors

[NeMa_4793301]

Sorry - which compiler are you using here? The one I posted was gcc (Hightec) syntax.

[User19424]

UC_wrangler wrote:
Sorry - which compiler are you using here? The one I posted was gcc (Hightec) syntax.

Tasking 🙂

[NeMa_4793301]

And here I went to all the work of installing GCC just to answer 😛

In Tasking, it's:

volatile int res;
__asm( "mov.d %0,a11" : "=d"(res) );

[User19424]

UC_wrangler wrote:
And here I went to all the work of installing GCC just to answer 😛

In Tasking, it's:

volatile int res;
__asm( "mov.d %0,a11" : "=d"(res) );

This works. Thank you! 😄