TMS570LC4357: TI CCS

Jayant Singh

Part Number: TMS570LC4357

I am not able to compile the following code in CCS

static inline void *OsReadMainStackPtr(void)
{
  void *result = NULL;
  asm volatile( "MRS  R1, CPSR\n\t"
                "CPS #0x13\n\t"
                "MOV %0, SP\n\t"
                "MSR CPSR_c, R1\n\t" : "=r" (result)); 

  return result;
}

It throws error

error #18: expected a ")"

at "MSR CPSR_c, R1\n\t" : "=r" (result));

The above code compiles properly in IAR.

over 3 years ago

0 Jayant Singh over 3 years ago

Prodigy 81 points

Taking a cue from https://e2e.ti.com/support/tools/code-composer-studio-group/ccs/f/code-composer-studio-forum/943713/compiler-awr1843-access-external-address-in-inline-assembly

I changed my code to this:

static inline void *OsReadMainStackPtr(void)
{
  void *result = NULL;
  asm volatile( "LOCALVAR:     .word       result"
                "MRS  R1, CPSR\n\t"
                "CPS #0x13\n\t"
                "MOV LOCALVAR, SP\n\t"
                "MSR CPSR_c, R1\n\t"); 

  return result;
}

This is compiling without error.

0 QJ Wang over 3 years ago in reply to Jayant Singh

TI__Guru**** 197596 points

So the issue has been resolved. Thanks

0 Jayant Singh over 3 years ago in reply to Jayant Singh

Prodigy 81 points

Actually, no it did not solve the problem. I am still getting compilation error.

0 QJ Wang over 3 years ago in reply to Jayant Singh

TI__Guru**** 197596 points

I compiled your modified code, there is no problem.

The GCC extended asm syntax uses colons (:) to delimit the operand parameters. I think that this extended syntax my not be supported by TI ARM assembler.

Arm-based microcontrollers

Arm-based microcontrollers forum

TMS570LC4357: TI CCS