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Why doesn't count more than 255 ??

 
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jruibarroso



Joined: 07 Jan 2006
Posts: 64
Location: Braga

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Why doesn't count more than 255 ??
PostPosted: Fri Jan 20, 2006 11:10 am     Reply with quote

I'm working with a 16F877 , made a counter but it don't pass over (seconds) >255 countings, it step to 0..1..2..3..4..255..0..1. Any body can help me with this ?? Thank you ALL

int seconds;

#int_rtcc
clock_isr() {
output_high(LED);
if(--int_count==0)
{
output_low(LED);
++seconds;
int_count=INTS_PER_SECOND;
}
Ttelmah
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PostPosted: Fri Jan 20, 2006 11:11 am     Reply with quote

Look at what sizes variables can hold.
An _integer_, by default, is an 'int8', and can only hold 0....255.

Best Wishes
jruibarroso



Joined: 07 Jan 2006
Posts: 64
Location: Braga

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PostPosted: Fri Jan 20, 2006 11:59 am     Reply with quote

ok, thank you very much

but there is another problem...

i changed int seconds; to int16 seconds;

but returns an erros on this line

printf(lcd_putc,"\f %U TEMPERATURA %2U\n", seconds , temp);

do you know why ?
newguy



Joined: 24 Jun 2004
Posts: 1908

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PostPosted: Fri Jan 20, 2006 12:18 pm     Reply with quote

Since 'seconds' is now a long integer (int16), you must use '%lu' not '%u' in your printf statement.

I recommend that you take some time to peruse the manual and/or online help.
Humberto



Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata

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PostPosted: Fri Jan 20, 2006 12:22 pm     Reply with quote

Quote:

i changed int seconds; to int16 seconds;


Ok, then you used %U within the string to indicate an unsigned 8 bit variable.
If you defined int16 seconds, printf expect %lu.

Read the CCS Compiler Manual, it will show you the diferent formats for the built-in function printf().


Humberto
jruibarroso



Joined: 07 Jan 2006
Posts: 64
Location: Braga

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PostPosted: Fri Jan 20, 2006 12:43 pm     Reply with quote

THANK you !! Very Happy
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