CCS C Software and Maintenance Offers
FAQFAQ   FAQForum Help   FAQOfficial CCS Support   SearchSearch  RegisterRegister 

ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

CCS does not monitor this forum on a regular basis.

Please do not post bug reports on this forum. Send them to support@ccsinfo.com

ADC problem

 
Post new topic   Reply to topic    CCS Forum Index -> General CCS C Discussion
View previous topic :: View next topic  
Author Message
jjude
Guest







ADC problem
PostPosted: Fri Mar 31, 2006 11:13 am     Reply with quote

ADC-results is 8-bit!?! I need 10-bit!

Code (i load code PIC16F876A bootloader):

#case
#include <16F876A.h>
#include <ctype.h>
#device *=16
#device adc=10

#org 0x1F00, 0x1FFF {} //BootLoader 8k 16F876/7

#use delay(clock=10000000)
#fuses NOWDT,HS, PUT, NOPROTECT, NODEBUG, BROWNOUT, NOLVP, NOCPD, NOWRT
#use rs232(baud=19200,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,errors)
.
setup_adc_ports(ALL_ANALOG);
setup_adc(ADC_CLOCK_INTERNAL);
int16 int16count;
.
set_adc_channel(0);
delay_us(100);
int16count=read_adc();
.
Results is 1,66 volt -> 85.

What is wrong?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

View user's profile Send private message

PostPosted: Fri Mar 31, 2006 1:23 pm     Reply with quote

You didn't show a complete test program so I have to guess what the problem is.

My guess is that you are using only the 8-bit format specifier for printf,
and you need to use 16-bit.

Example:

You are probably doing this:
Quote:
printf("%x", int16count);


You should do this:
Quote:
printf("%lx", int16count);

Note the lower case "L" in front of the x. This tells the compiler
to display a 16-bit value.
jjude
Guest







Print
PostPosted: Sat Apr 01, 2006 1:34 am     Reply with quote

I print print("%lu",int32count);
I test adc=16. This send results 0x1ff0
adc=10 results is 0x0ff?!?!?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

View user's profile Send private message

PostPosted: Sat Apr 01, 2006 2:05 am     Reply with quote

Post your compiler version. This is a number such as 3.191 or 3.245,
and you can find it at the top of the .LST file. The .LST file is generated
each time you compile a program. Look for that file in your project
folder.

If you post your compiler version, I can check if there is a problem
with the A/D converter functions in your version.
Display posts from previous:   
Post new topic   Reply to topic    CCS Forum Index -> General CCS C Discussion All times are GMT - 6 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group