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Re: [Simulavr-devel] UART

From: Theodore A. Roth
Subject: Re: [Simulavr-devel] UART
Date: Thu, 20 Nov 2003 14:59:21 -0800 (PST)

On Thu, 20 Nov 2003, Keith Gudger wrote:

> Ted:
> How is checking out the spi / adc going?

Sorry, I've been slacking on that. I am hoping to get on it this
weekend. I've been having to do a lot of girlfriend stuff on my weekends

> The reason I ask is that I'm close to having the UART code ready.
> I'm hoping you want it...

Definitely. Keep 'em coming.

> I have some questions about simulavr behavior with my uart code that I'm
> hoping your experience can help me find the answers.
> First, it appears that when starting up, simulavr executes the "read"
> routine passed to vdev_construct.  I haven't noticed this before, but
> maybe it's just the way my code works this time.  Is this possible?  (It's
> showing up a message from that function even before I get the "Waiting on
> port 1212 ... message.)

I need more info. Can you send me the output message in question?

> Second, the interrupt call-back gets installed as an
> avr_core_async_cb_add, the same as all the other files I've worked on.
> However, I notice that the call-back routine gets called *a lot*.  Even
> when it looks like nothings happening.  Is this normal?  Should I be
> worried?

The callbacks should get called a lot. Clock callbacks get called for
_every_ clock cycle, async callbacks for every instruction.

Ted Roth

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