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Setting up ADC

 
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Student
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Setting up ADC
PostPosted: Thu Feb 22, 2007 7:16 am     Reply with quote

Hi,

i'm trying to write a program to run setup my adc and i'm getting problems and i do not know the reason why. Anyone can help me? Thanks!

Code:
#include <16F877.h>
#device adc=10
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=2000000)
#use rs232(baud=9600, xmit = PIN_C6, rcv = PIN_C7)

int16 value;

void main() {
   setup_adc_ports(RA0_ANALOG);
   setup_adc(ADC_CLOCK_INTERNAL);
   delay_ms(2000);
   set_adc_channel(0);

   while(1)
   {
      value=read_adc(); //read the ADC
     printf("%LX \n\r", value);
     delay_ms(1000);
   }
}



Output from hyperterminal:
rrrrr>>>>><<<<>>>>[/code]
Ttelmah
Guest







PostPosted: Thu Feb 22, 2007 9:39 am     Reply with quote

How is the serial connected to the PC?. What happens if you do a 'test' print like:

printf("Test message\n\r");

There is nothing obviously wrong with the code, so I'd suspect a hardware problem with the serial connection.

Best Wishes
buiz



Joined: 21 Feb 2007
Posts: 4

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PostPosted: Thu Feb 22, 2007 9:48 am     Reply with quote

Hello!



#include <16F877.h>
#device adc=10
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=2000000) // crystal 2000000? or 20000000? look at this detail!!!
#use rs232(baud=9600, xmit = PIN_C6, rcv = PIN_C7)

int16 value;

void main() {
setup_ADC_ports (an0); // (an0) it configures door an0
setup_adc(ADC_CLOCK_INTERNAL);
delay_ms(2000);
set_adc_channel(0);

while(1)
{
value=read_adc(); //read the ADC
printf("%LX \n\r", value);
delay_ms(1000);
}
}



Ok!


Last edited by buiz on Thu Feb 22, 2007 11:36 am; edited 2 times in total
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Feb 22, 2007 11:20 am     Reply with quote

Quote:

Output from hyperterminal:
rrrrr>>>>><<<<>>>>

#include <16F877.h>
#device adc=10
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=2000000)
#use rs232(baud=9600, xmit = PIN_C6, rcv = PIN_C7)

Look closely at the line in bold. Then look at the numbers on your
crystal.
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