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Subject: Re: Use SLEEP instruction for longer (?) runtime

Re: Use SLEEP instruction for longer (?) runtime

From: Linus Nielsen Feltzing <>
Date: Wed, 22 Jan 2003 23:01:56 +0100

On Wed, 22 Jan 2003 22:50:24 +0100, Simon ElÚn wrote:
> Question: In button.c the remote control is polled every tick. The
> comments seems to imply that it could work interrupt-driven
> instead, is it possible?

No, it will not work interrupt driven. The garbage that is generated
when the phones are inserted/extracted screws up the interrupt
handling. We moved from interrupt driven to polled for just that

> If not, can the poll frequency be slowed down without problems?

Should be possible, yes.

> Other than this, there seems to be nothing left (on the recorder,
> at least)
> that needs polling more often than about 20 times/s. Now a more
> intelligent scheduler seems a much better idea.

Intelligent == more complex. I want proof of a fairly substantial
power saving before we mess with the scheduler. There is a lot of
code that depends on the scheduler behaviour.


Linus Nielsen Feltzing, on 2003-01-22
Received on 2003-01-22

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