[TriEmbed] Atmega fast startup

[Josh Wyatt]

I wonder how safe this is... Seems like it would be flirting with a few
race conditions, depending on what is needed after startup (timers, etc)...?
Thanks,
Josh

On Tue, Jan 9, 2018 at 8:00 PM, Pete Soper via TriEmbed <
triembed at triembed.org> wrote:

> Apropos Shane's discussion of trying to get an Atmega going quickly, I
> hacked a 328p to use the internal 8mhz clock with 0ms startup delay. Then I
> hacked the C runtime code to skip zeroing data, etc and instead go directly
> from the boot reset vector to setting the pin's DDR and the PORT high.  I
> triggered on the five volt supply coming up (yellow trace) and timed to the
> point where I could get a GPIO pin driven high (blue trace). It takes right
> at 400usec and is very repeatable.
> -Pete
>
>
>
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