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Problems with the pic16f877A exercise book code

 
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Problems with the pic16f877A exercise book code
PostPosted: Sat Jun 05, 2004 11:36 pm     Reply with quote
Im useing the this code from the book

Code:

#include <16f877A.h>
#include <ds1631.c>
#fuses HS,NOLVP,NOWDT,PUT

#use DELAY(clock=20000000)
#use RS232(BAUD=9600, XMIT=PIN_C6, RCV=PIN_C7)

void main(){
   float value;
   
   init_temp();
   
   while(true){
      
      value = read_full_temp();
      value /= 100.0;
      printf("%3.2f\n\r", value);
      delay_ms(1000);
      
   }

}


here is the snip of the output from the serial port

84.41
87.80
93.91
-31.79
-28.09
-26.29

I'm using pcm 3.182

Why cant it read temps over 100?
RatFink



Joined: 01 May 2004
Posts: 49

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oops
PostPosted: Sun Jun 06, 2004 12:50 am     Reply with quote
oops
MikeP



Joined: 07 Sep 2003
Posts: 49

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PostPosted: Sun Jun 06, 2004 4:39 pm     Reply with quote
Nobody has any ideas about this problem..

Im thinking its the math in the ds1631.c driver file
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Jun 06, 2004 4:55 pm     Reply with quote
I once posted a modification of the DS1631 driver that lets
you see the raw data returned by the chip. You could try
this code and see if you're able to get the full range of
values out of the chip.
http://www.ccsinfo.com/forum/viewtopic.php?t=18743
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