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RE: [avr-libc-dev] does delay.h really need all this junk?
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From: |
Weddington, Eric |
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Subject: |
RE: [avr-libc-dev] does delay.h really need all this junk? |
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Date: |
Mon, 8 Dec 2008 22:34:43 -0700 |
> -----Original Message-----
> From:
> address@hidden
> [mailto:address@hidden
> org] On Behalf Of Steve Franks
> Sent: Monday, December 08, 2008 5:06 PM
> To: address@hidden
> Subject: [avr-libc-dev] does delay.h really need all this junk?
>
> Y'all,
>
> I was trying to figure out why _delay_us() was eating up all my flash
> in a tiny2313, so I threw in a <link> -nodefaultlibs, and look what I
> found! Is this really just for the convinienece of using F_CPU? I
> grabbed delay_loop_2(), put it in a for() loop, and my code went from
> 4k to 1k...
Read the documentation on _delay_us(). You need to use a constant value for the
parameter, and you need to turn optimizations on.