C podozrenie na bug compilera

[Stano]

Ano zda sa ze naozaj keca debugger, funkcia sa sprava korektne a aj 
debug vypis cez usart je spravny.
Dakujem za nakopnutie spravnym smerom.

Jan Waclawek  wrote / napísal(a):
> V tom disassembleri nevidim ziadny zasadnejsi problem; samozrejme zalezi na
> hodnote stack pointra (co zrejme ukazuje na zaciatok predtym vytvoreneho
> stack frame) a registra r4 (ktory zase zrejme ukazuje na pole buf[]); ale
> silne pochybujem, ze by tam bol nejaky problem.
>
> Skor verim tomu, ze kecia nastroj, ktorym to pozerate, ci je to uz
> simulator alebo nejaky iny debugger. Skuste nejaku nezavislu metodu -
> poslat hodnotu premennej cez seriak do PC, vypisat ho na nejaky pripojeny
> displej, alebo take nieco.
>
> wek
>
>
> ----- Original Message ---------------
>
>   
>> Keil MDK470a
>>    uint16_t radress, rquantity;
>>
>>    buf[0] = 0x87;
>>    buf[1] = 0x65;
>>    buf[2] = 0x43;
>>    buf[3] = 0x21;
>>    radress = (uint16_t)buf[0] << 8;
>>    radress |= buf[1];
>>    rquantity = (uint16_t)buf[2] << 8;
>>    rquantity |= buf[3];
>>
>> prelozil ako:
>>   382:         buf[0] = 0x87;
>> 0x08000B82 2087      MOVS     r0,#0x87
>> 0x08000B84 7020      STRB     r0,[r4,#0x00]
>>   383:         buf[1] = 0x65;
>> 0x08000B86 2065      MOVS     r0,#0x65
>> 0x08000B88 7060      STRB     r0,[r4,#0x01]
>>   384:         buf[2] = 0x43;
>> 0x08000B8A 2043      MOVS     r0,#0x43
>> 0x08000B8C 70A0      STRB     r0,[r4,#0x02]
>>   385:         buf[3] = 0x21;
>> 0x08000B8E 2021      MOVS     r0,#0x21
>> 0x08000B90 70E0      STRB     r0,[r4,#0x03]
>>   386:         radress = (uint16_t)buf[0] << 8;
>> 0x08000B92 7820      LDRB     r0,[r4,#0x00]
>> 0x08000B94 0200      LSLS     r0,r0,#8
>> 0x08000B96 9003      STR      r0,[sp,#0x0C]
>>   387:         radress |= buf[1];
>> 0x08000B98 7860      LDRB     r0,[r4,#0x01]
>> 0x08000B9A 9903      LDR      r1,[sp,#0x0C]
>> 0x08000B9C 4308      ORRS     r0,r0,r1
>> 0x08000B9E 9003      STR      r0,[sp,#0x0C]
>>   388:         rquantity = (uint16_t)buf[2] << 8;
>> 0x08000BA0 78A0      LDRB     r0,[r4,#0x02]
>> 0x08000BA2 0205      LSLS     r5,r0,#8
>>   389:         rquantity |= buf[3];
>> 0x08000BA4 78E0      LDRB     r0,[r4,#0x03]
>> 0x08000BA6 4305      ORRS     r5,r5,r0
>>
>> rquantity je OK, radress hodnota 0x0001
>> MCU core cortex M0
>>
>> Jan Waclawek  wrote / napísal(a):
>>     
>>> Aky kompilator, aka verzia, ake su command-line options, ako vyzera
>>> disassembly funkcie?
>>>
>>> wek
>>>
>>>
>>>
>>> ----- Original Message ---------------
>>>
>>>
>>>
>>>   
>>>       
>>>> Zdravim konferenci, mam nasledovny problem:
>>>>
>>>> void funkcia (uint8_t *buf, uint8_t len, uint32_t *coils){
>>>>    uint16_t radr;
>>>>    radr = buf[0];
>>>>    ...
>>>> }
>>>>
>>>> A v debuggeri do radr priradi 0x0102, cize 16bit cislo. Optimalizacie su 
>>>> vypnute a priznam sa, nechapem.
>>>> Ako je nieco take vobec mozne?
>>>>     
>>>>         
>
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