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I forgot to add the disassembly after adding mmcu to linking.
Here's what it looks like now:
- --- --- Disassembly being --- ---
example.elf: file format elf32-avr
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00000090 00000000 00000000 00000054 2**1
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .stab 000006cc 00000000 00000000 000000e4 2**2
CONTENTS, READONLY, DEBUGGING
2 .stabstr 00000081 00000000 00000000 000007b0 2**0
CONTENTS, READONLY, DEBUGGING
Disassembly of section .text:
00000000 <__vectors>:
0: 0c 94 34 00 jmp 0x68 ; 0x68 <__ctors_end>
4: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
8: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
c: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
10: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
14: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
18: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
1c: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
20: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
24: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
28: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
2c: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
30: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
34: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
38: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
3c: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
40: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
44: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
48: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
4c: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
50: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
54: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
58: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
5c: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
60: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
64: 0c 94 3e 00 jmp 0x7c ; 0x7c <__bad_interrupt>
00000068 <__ctors_end>:
68: 11 24 eor r1, r1
6a: 1f be out 0x3f, r1 ; 63
6c: cf ef ldi r28, 0xFF ; 255
6e: d8 e0 ldi r29, 0x08 ; 8
70: de bf out 0x3e, r29 ; 62
72: cd bf out 0x3d, r28 ; 61
74: 0e 94 42 00 call 0x84 ; 0x84 <main>
78: 0c 94 46 00 jmp 0x8c ; 0x8c <_exit>
0000007c <__bad_interrupt>:
7c: 0c 94 00 00 jmp 0 ; 0x0 <__vectors>
00000080 <turn_on_pb>:
return 0;
}
void turn_on_pb(void)
{
PORTB |= (1 << PB0);
80: 28 9a sbi 0x05, 0 ; 5
}
82: 08 95 ret
00000084 <main>:
void turn_on_pb(void);
int main(void)
{
DDRB |= (1 << PB0);
84: 20 9a sbi 0x04, 0 ; 4
turn_on_pb();
86: 0e 94 40 00 call 0x80 ; 0x80 <turn_on_pb>
8a: ff cf rjmp .-2 ; 0x8a <main+0x6>
0000008c <_exit>:
8c: f8 94 cli
0000008e <__stop_program>:
8e: ff cf rjmp .-2 ; 0x8e <__stop_program>
- --- --- Disassembly end --- ---
On 3/1/12 4:00 PM, Richard Zetterberg wrote:
> Thanks for the input Georg-Johann and Johannes.
>
> Georg-Johann: I double checked the fuses and the watchdog is not
> active.
>
> Johannes: I'm not sure how I would go about doing that. But I just
> read a document called "Getting started with GCC for AVR32" and
> found the following:
>
> "The linking process needs information about code and data memory
> location. Using a linker script provides this. If specifying which
> device you are compiling code for by using the ?-mpart=<part>?
> option in avr32-gcc, a default linker script for that device will
> be used."
>
> That got me thinking, maybe that's the problem, that I don't
> provide the mmcu when linking. So I changed this line in the
> makefile:
>
> elf: avr-gcc example.o -o example.elf
>
> To this:
>
> elf: avr-gcc -mmcu=atmega328 example.o -o example.elf
>
>
> And after I compiled, linked, hexed and upload the problem was no
> longer present.
>
> With my no-existing experience I conclude that's the source of the
> problem, and thus the problem is solved.
>
> Does that make sense or is that just a coincidence that it is now
> working?
>
> On 3/1/12 3:30 PM, Georg-Johann Lay wrote:
>
>> You are sure there is no watchdog active?
>
>
> On 3/1/12 3:24 PM, Johannes Bauer wrote:
>
>> Why don't you include the whole program assembly (i.e. after
>> linking), but only compile units? This would also show the
>> startup code, where a fault in setting up the stack pointer would
>> be visible (i.e. would cause the "call" to fail and therefore
>> resetting the MCU instead of the behavior you desire).
>
>> Best regards, Joe
>
>> _______________________________________________ AVR-GCC-list
>> mailing list AVR-GCC-list@nongnu.org
>> https://lists.nongnu.org/mailman/listinfo/avr-gcc-list
>
>
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