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Re: [avr-gcc-list] light up and led

From: Joerg Wunsch
Subject: Re: [avr-gcc-list] light up and led
Date: Thu, 6 Oct 2005 21:59:53 +0200 (MET DST)

Patrick Blanchard <address@hidden> wrote:

>> Yes, use a hardware timer. ;-)  ...

>> Otherwise, have a look at the functions in <avr/delay.h>.

> FWIW using the delay.h made more sense for me; easier code to
> follow.

It eats up your CPU.  Even if you don't have any other work for your
CPU while waiting, with a hardware timer, you could at least reduce
the overall power consumption by putting the CPU to sleep.

Sure, for really short delays, a spin-loop makes sense, but when
you want your LED to blink, just use it as a good example to get
acquainted with hardware timers (even though obviously, conserving
energy isn't the most important feature of a LED blinker ;-).

It's for some reason that even the very simple demo.c that accompanies
avr-libc uses a hardware timer.

cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/                        NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)

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