AVR Freaks

   8030c:	4b07      	ldr	r3, [pc, #28]	; (8032c <main+0x28>)
   8030e:	f44f 4200 	mov.w	r2, #32768	; 0x8000
   80312:	605a      	str	r2, [r3, #4]
	
    while (1) 
    {
		static int count = 0;
		
        delay(5); 
   80314:	2005      	movs	r0, #5
   80316:	4b06      	ldr	r3, [pc, #24]	; (80330 <main+0x2c>)
   80318:	4798      	blx	r3
		
		++count;
   8031a:	4b06      	ldr	r3, [pc, #24]	; (80334 <main+0x30>)
   8031c:	681b      	ldr	r3, [r3, #0]
   8031e:	1c5a      	adds	r2, r3, #1
   80320:	4b04      	ldr	r3, [pc, #16]	; (80334 <main+0x30>)
   80322:	601a      	str	r2, [r3, #0]
    }
   80324:	e7f6      	b.n	80314 <main+0x10>
   80326:	bf00      	nop
   80328:	00080235 	.word	0x00080235
   8032c:	400e1a50 	.word	0x400e1a50
   80330:	00080338 	.word	0x00080338
   80334:	20000454 	.word	0x20000454

00080338 <delay>:
 * Created: Mon 10 6 2014 6:14:19 PM
 *  Author: Mike
 */ 
		.section .text.utils
		.global delay
delay:	mov		R1, #0x0021
   80338:	2121      	movs	r1, #33	; 0x21

0008033a <loop>:
loop:	sub		R1, R1, #1
   8033a:	3901      	subs	r1, #1
		cbz		R1, iloop
   8033c:	b101      	cbz	r1, 80340 <iloop>
		b		loop
   8033e:	e7fc      	b.n	8033a <loop>

00080340 <iloop>:
iloop:	sub		R0, R0, #1
   80340:	3801      	subs	r0, #1
		cbnz	R0, ret
   80342:	b900      	cbnz	r0, 80346 <ret>
		b		delay
   80344:	e7f8      	b.n	80338 <delay>

00080346 <ret>:
ret:	bx		lr	
   80346:	4770      	bx	lr

Hmm hadn't thought of alignment problem, but looks OK?

[edit]

I tried adding an .align 8 with no success?

[/edit]

Clawson I appreciate your time with this.

The asm invocation is; -mthumb -D_SAM3X8E_   //Looks OK

void cdelay(int count)
{
   80304:	b480      	push	{r7}
   80306:	b085      	sub	sp, #20
   80308:	af00      	add	r7, sp, #0
   8030a:	6078      	str	r0, [r7, #4]
	for (int i = 0; i < count; i++){}
   8030c:	2300      	movs	r3, #0
   8030e:	60fb      	str	r3, [r7, #12]
   80310:	e002      	b.n	80318 <cdelay+0x14>
   80312:	68fb      	ldr	r3, [r7, #12]
   80314:	3301      	adds	r3, #1
   80316:	60fb      	str	r3, [r7, #12]
   80318:	68fa      	ldr	r2, [r7, #12]
   8031a:	687b      	ldr	r3, [r7, #4]
   8031c:	429a      	cmp	r2, r3
   8031e:	dbf8      	blt.n	80312 <cdelay+0xe>
}
   80320:	3714      	adds	r7, #20
   80322:	46bd      	mov	sp, r7
   80324:	f85d 7b04 	ldr.w	r7,  , #4
   80328:	4770      	bx	lr
   8032a:	bf00      	nop

0008032c <main>:
 * \brief Application entry point.
 *
 * \return Unused (ANSI-C compatibility).
 */
int main(void)
{
   8032c:	b580      	push	{r7, lr}
   8032e:	af00      	add	r7, sp, #0
    /* Initialize the SAM system */
    SystemInit();
   80330:	4b06      	ldr	r3, [pc, #24]	; (8034c <main+0x20>)
   80332:	4798      	blx	r3

	//Disable WDT
	WDT->WDT_MR = WDT_MR_WDDIS;
   80334:	4b06      	ldr	r3, [pc, #24]	; (80350 <main+0x24>)
   80336:	f44f 4200 	mov.w	r2, #32768	; 0x8000
   8033a:	605a      	str	r2, [r3, #4]
	
    while (1) 
    {
		cdelay(5);
   8033c:	2005      	movs	r0, #5
   8033e:	4b05      	ldr	r3, [pc, #20]	; (80354 <main+0x28>)
   80340:	4798      	blx	r3
        delay(5); 
   80342:	2005      	movs	r0, #5
   80344:	4b04      	ldr	r3, [pc, #16]	; (80358 <main+0x2c>)
   80346:	4798      	blx	r3
    }
   80348:	e7f8      	b.n	8033c <main+0x10>
   8034a:	bf00      	nop
   8034c:	00080235 	.word	0x00080235
   80350:	400e1a50 	.word	0x400e1a50
   80354:	00080305 	.word	0x00080305
   80358:	0008035c 	.word	0x0008035c

0008035c <delay>:
 *  Author: Mike
 */ 
		.section .text.utils
		.align	2
		.global delay
delay:	mov		R1, #0x0021
   8035c:	2121      	movs	r1, #33	; 0x21

0008035e <loop>:
loop:	sub		R1, R1, #1
   8035e:	3901      	subs	r1, #1
		cbz		R1, iloop
   80360:	b101      	cbz	r1, 80364 <iloop>
		b		loop
   80362:	e7fc      	b.n	8035e <loop>

00080364 <iloop>:
iloop:	sub		R0, R0, #1
   80364:	3801      	subs	r0, #1
		cbnz	R0, ret
   80366:	b900      	cbnz	r0, 8036a <ret>
		b		delay
   80368:	e7f8      	b.n	8035c <delay>

0008036a <ret>:
ret:	bx		lr	
   8036a:	4770      	bx	lr

Interesting that the cdelay pointer in the jump table is to  0x00080305 but the code says it begins at 0x00080304? and if you look at the asm code it points to what I would thing would be the correct address.

The C code equivalent works and the asm code does not?  Now I'm really confused...but at my age that don't take much. :)

Clawson,

I included the .s file in my original post.

Why does the thumb code point to destination + 1 instead of destination?  All the asm code I've wrote over the years always pointed to the actual address, but then again it never used a jump table like they do here.

Here's the .s file again;

/*
 * utils.s
 *
 * Created: Mon 10 6 2014 6:14:19 PM
 *  Author: Mike
 */ 
		.section .text.utils
		.align	2
		.global delay
delay:	mov		R1, #0x0021
loop:	sub		R1, R1, #1
		cbz		R1, iloop
		b		loop
iloop:	sub		R0, R0, #1
		cbnz	R0, ret
		b		delay
ret:	bx		lr	
		.end

Clawson,

Followup;

Found an excellent article while researching my problem and found http://www.coranac.com/tonc/text/asm.htm "Whirlwind Tour of ARM Assembly", very good article and explains a lot.

Thanks again for your help,

Mike

Found a good article on ARM assembler http://www.coranac.com/tonc/text/asm.htm and the .thumb can be used but it also says, and I use the .code 16 directive.  I guess that still a bit of a kludge but the .code 16 is a little more definitive.

Yes I was just passing it on to the OP.

I agree let the C compiler do the work!