On Thu, Aug 4, 2011 at 10:22 AM, Alexandru Stefan
<alexandru.ste...@cloudbit.ro> wrote:
> Hello,
>
> I am currently working on two inline routines to read and write
> data to
> addresses >64k.
>
> This is the 'write' routine:
>
>
> static inline __attribute__((always_inline)) void
> flash_write(uint32_t addr,
> uint16_t val){
>
> __asm__ __volatile__ (
> "dint \n"
> "nop \n"
> "pushx.a r15 \n"
> "movx.a %[addr], r15 \n"
> "movx %[val], @r15 \n"
> "popx.a r15 \n"
> "eint \n"
> :
> :[addr] "r"(addr), [val] "r"(val)
> );
> }
>
> and this is the asm code it generates:
>
> static inline __attribute__((always_inline)) void
> flash_write(uint32_t addr,
> uint16_t val){
>
> __asm__ __volatile__ (
> 315c: 2e 44 mov @r4, r14
> 315e: 1f 44 02 00 mov 2(r4),
> r15 ;0x0002(r4)
> 3162: 1d 44 04 00 mov 4(r4),
> r13 ;0x0004(r4)
> 3166: 32 c2 dint
> 3168: 03 43 nop
> 316a: 00 18 .word 0x1800; ????
> 316c: 4f 12 push.b r15
> 316e: 00 18 .word 0x1800; ????
> 3170: 4f 4e mov.b r14, r15
> 3172: 40 18 .word 0x1840; ????
> 3174: 8f 4d 00 00 mov r13,
> 0(r15) ;0x0000(r15)
> 3178: 00 18 .word 0x1800; ????
> 317a: 7f 41 pop.b r15
> 317c: 32 d2 eint
0: 32 c2 dint
2: 03 43 nop
4: 00 18 4f 12 pushx.a r15
8: 00 18 4f 4e movx.a r14, r15
c: 40 18 8f 4d movx r13, 0(r15) ;0x00000(r15)
10: 00 00
12: 00 18 7f 41 popx.a r15
16: 32 d2 eint
18: 30 41 ret
Your disassembler isn't up to date.
Peter
>
> uint32_t address = 0x11110UL;
> uint16_t val = 0x33;
>
> flash_write(address, val);
> }
>
> The main question is why is used the simple MOV instruction
> instead of the
> extended version?
>
> Regards,
> Alex
>
>
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