Re: [avr-gcc-list] Time-efficient read of high byte in two-byte variable

[Wallace White]

E. Weddington wrote:
> > Let's see, my variable in question is a signed int... so I could
> > change the typedef union
> >
> > typedef union
> > {
> >  int16_t word;
> >  hilow_t byte;
> > } mytype ;
> >
> > and tack on .word to all my references to that variable... that should
> > be fine, right?
> >
> > Thanks,
> > Wallace
>
> Hmm. Well it's up to you as to how you want to handle the signed 
> issue. Do you want the high byte to be signed? or unsigned? Do you 
> want the low byte to be signed as well?

I don't really care which byte carries the sign... I'd just like to be 
able to use the variable as a regular signed int in the rest of the 
program--where it is used in math functions--while efficiently accessing 
its high byte during the function that spits the variable out the UART.

The efficiency isn't critical for this application, really, so I may 
just keep doing it the way I had been. But thanks, Eric and Ralph, for 
the suggestions.

- Wallace