AVR-Chat

Hi Cat,

On Mon, Jul 4, 2011 at 12:55 PM, Cat C <catalin_cluj@hotmail.com> wrote:
>
> Hi there,
> Looking at the delay functions, I see that:     void _delay_us
>          (
>          double
>           __us )has a maximal possible delay is 768 us / F_CPU in MHz.
> But:If the avr-gcc toolchain has __builtin_avr_delay_cycles(unsigned long)
> support, maximal possible delay is 4294967.295 us/ F_CPU in MHz.
> How do I know if the avr-gcc toolchain has __builtin_avr_delay_cycles(unsigned long) support?

I think that as long as you don't disable it on the command line, then
the builtin support will be there. You can disable builtin functions
using -fno-builtin  or disable particular builtin functions using
-fno-builtin-function (replace function with the name of the
function).

-- 
Dave Hylands
Shuswap, BC, Canada
http://www.davehylands.com