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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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 Posted: Sat Nov 26, 2011 3:42 pm |
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I'm not at a location today where I can test this in hardware, or even with
the latest version, but try this code. I think it has a good chance to work.
| Code: |
#include <18F25K20.h>
#fuses H4,NOWDT,NOLVP,BROWNOUT,PUT,NOPBADEN
#use delay(clock=40M)
//===========================================
void main()
{
while(1) // Toggle LED at 1 Hz rate
{
output_toggle(PIN_B0);
delay_ms(500);
}
} |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Sat Nov 26, 2011 4:22 pm |
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| Quote: | | try this code. I think it has a good chance to work. |
Yes. If you specify H4, you don't need (oscillator=10M,clock=40M) respectively (crystal=10M,clock=40M). The #delay syntax has been apparently intended as an alternative to explicite PLL fuses. Both methods work.
You may recognize an adavantage of the #use delay PLL specification when using a device that supports various clock multiply rates, not only fixed factor 4.
The problem is, that CCS abandoned once more a previously working syntax. |
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mose
Joined: 26 Nov 2011
Posts: 4
Location: Denmark
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| Posted: Sat Nov 26, 2011 5:41 pm |
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@PCM programmer
Your code works.
I have tried the delay without either oscillator or crystal. But that just didn't make sense to me, that none was needed all of a sudden.
@FvM
You are right that since the PLL is fixed, they can very well come to the conclusion that all will be easier without oscillator / crystal in the delay line.
But I just prefer if CCS clearly state how their syntax is intended to work, especially when they change a working syntax to something new. - otherwise it hard to trust ones code to work properly under all conditions.
In general I just prefer to be sure, and when even the help file examples didnt work, I went for help...
Thanks for your help and answers. |
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