GNU vs GHS

[kb24]

I am using SPC58EC. When I compile same code with GNU and GHS(Green Hills Software) I see different results.

int main(void) {
 
 
	uint8_t mode;
 
	MC_ME.PCTL[15].R = (uint8_t)18;
	mode = (uint8_t)MC_ME.MCTL.B.TARGET_MODE;
 
	//SPCSetRunMode
	/* Clearing status register bits */
	MC_ME.IS.R = 0x3FU;
 
	/* Starts a transition process.*/
	MC_ME.MCTL.R = (mode << 28) | 0x5AF0UL;
	MC_ME.MCTL.R = (mode << 28) | 0xA50FUL;
 
	/* Waits for the mode switch or an error condition.*/
	while (MC_ME.IS.R == 0U) {
	;
	}
	/* Check if no error during mode switch */
	if (MC_ME.IS.B.I_MTC != 1U)
	{
		while(1);
	}
 
	SIUL2.GPDO[88].R = 0;
	SIUL2.MSCR_IO[88].R = ((2 << 24) | (1 << 23));
 
	SIUL2.GPDO[89].R = 0;
	SIUL2.MSCR_IO[89].R = ((2 << 24) | (1 << 23));
 
  
  /* Application main loop.*/
  for ( ; ; ) {
	  SIUL2.GPDO[88].R = ~SIUL2.GPDO[88].R;
	  SIUL2.GPDO[89].R = ~SIUL2.GPDO[89].R;
	  for(long i=0;i<10000000;i++);
  }
}

All code is this, I am not using library functions. Startup files are almost same only order of ram init, interrupt vector init etc. is different. In GNU version I can toggle LED, but in GHS version I cant modify SIUL2 registers, so I cant do settings or toggle the output. Why is this happening? Cant we compile SPC5 studio example codes with GHS?

[kb24]

I removed that part and it is still working, anyways thank you for your help.

[ODOUV.1]

Hello,

it concludes it is not the root cause of your issue.

I wonder if you have the same definition of SIUL2 in your 2 projects ?

on SPC58EC it should be:

#define SIUL2                 (*(volatile struct SIUL2_tag *) 0xf7fc0000UL)

BRs,

-Olivier

[kb24]

Yes those definitions are same. As I said I commented out existing project's code and used the code above only toggling LEDs. It didn't work so I gave up commenting out their initialization and use it. I only put this part:

SIUL2.GPDO[88].R = 0;

SIUL2.MSCR_IO[88].R = ((2 << 24) | (1 << 23));

SIUL2.GPDO[89].R = 0;

SIUL2.MSCR_IO[89].R = ((2 << 24) | (1 << 23));

That way let me change SIUL2 and I could toggle LEDs. I couldn't understand because assembly codes of main functions were same, so code was trying to modify that register and processor doesn't let it change. Also in debug session I couldnt change it from SFRs window. It somehow does protection or something like that.

[ODOUV.1 · Accepted solution]

As you removed all ST libraries, I wonder if you also removed the stuff done at boot in clock.c

void __early_init(void) {

 spc_clock_init();

}

removing that, I cannot toggle the led either.

BRs,

-Olivier

[kb24]

I am so sorry, I didn't see it was weak function and __early_init name was like just assembly function, I couldn't imagine ST define it in .c file so I didn't even search in project. I only looked in that file and __early_init was an empty function. Thank you for making me awake to this and thank you for all replies and support.

[ODOUV.1]

Thank you for your answer.

Happy that the situation is unlocked at your side.

Best regards,

-Olivier