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delay_us()

 
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Fabri



Joined: 22 Aug 2005
Posts: 275

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delay_us()
PostPosted: Wed Nov 23, 2005 9:38 am     Reply with quote
Hi Everybody,

In my application I use delay_us(9000) to have an delay of 9ms. And Work right.

I change so:

Quote:

int16 m;

m=9000; // 0x2328
delay_us(m);


In this case the delay is not 9ms but only 45us. I verified so with oscilloscope in debug mode.

My compiler Version is. 3.235 with PIC16F876A

what are you think about?
drh



Joined: 12 Jul 2004
Posts: 192
Location: Hemet, California USA

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PostPosted: Wed Nov 23, 2005 9:57 am     Reply with quote
I think you should read the compilor manual. You can use DELAY_US() with a constant up to 65535 OR a variable up to 255. That's why delay_us(9000) worked and delay_us(m) did not.
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David
Fabri



Joined: 22 Aug 2005
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PostPosted: Wed Nov 23, 2005 10:00 am     Reply with quote
Is there any way to use 16 bit variable in delay_us() ?

I need the maximal resolution.

Regards
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Nov 23, 2005 10:08 am     Reply with quote
http://www.ccsinfo.com/forum/viewtopic.php?t=16656&highlight=longdelayus
drh



Joined: 12 Jul 2004
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PostPosted: Wed Nov 23, 2005 10:15 am     Reply with quote
Here's one way.

Code:

int8   i;
int8   resolution;

resolution = 100; // adjust this number

for (i = 90;i > 0;i--)
   delay_us(resolution);


Adjust 'resolution' to compensate for the time it takes
to execute the for loop.
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David
Fabri



Joined: 22 Aug 2005
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PostPosted: Wed Nov 23, 2005 10:29 am     Reply with quote
Thanks for support,

I decided to use Timer1 whith his 16 bits of resolution. After reset it I stay in loop till became the same or more than my variable.

By the way, in other routine I use timer1 to mesure frequency of some waves.

Regards,
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