Re: [uracoli-devel] Re: Regarding the hif_put_blk() function

[Charles Goyard]

Hi,

2010/6/17 rifo rifo <address@hidden>:
> I have checked an uracoli example that calls the hif_put_blk() function
> (namely, xmpl_hif.c)  and I couldn't see any mechanism to restore the 
> interrupts after hif_put_blk() function returns.

Here's what you are missing: SREG is the register for global
interrupts. Basically, sei "does" SREG=1, and cli "does" SREG=0.

Doing:
k=SREG;
...stuff...
SREG=k;

if a more efficient way to do that:
k=SREG;
...stuff...
if(k == 1)
    sei();
}

So the conclusion is : interrupts are re-enabled at the end of
hif_put_blk() ONLY IF they where at the beginning.

In avr libc there's a straightforward relationship between
instructions and hardware, so have a look at the libc source code and
the datasheet of your mcu, it should help a lot.

see ya,

-- 
Charles