Doesn't there need to be a nop between the clear of GIE and the
following move? The DINT instruction description in the manual
implies that without it the interrupt could still occur during the
first movx.
Peter
On Mon, Apr 18, 2011 at 9:27 AM, JMGross <msp...@grossibaer.de> wrote:
> extern inline __attribute__((always_inline)) unsigned char FlashReadByte
> (unsigned long addr){
> unsigned char result;
> unsigned int register sr, flash;
> __asm__ __volatile__ ("mov r2 , %1 \n"
> "bic %3 , r2 \n"
> "movx.a %4 , %2 \n"
> "movx.b @%2, %0 \n"
> "mov %1 , r2 \n"
> :"=X"(result),"=r"(sr),"=r"(flash)
> :"i"(GIE),"m"(addr));
> return result;
> }
>
> It compiles well with or without optimization and is always inlined.
> It still lets the compiler decide where to put the result (memory, register,
> whatever) and
> without optimization generates still some unnecessary stuff, but less that
> the original version.
> And it works.
> With optimization, the result is identical to the original.
>
>> p.s. just starting with this toolchain and MSP430 in general.
>
> We all did once :)
>
>
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