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ADC is not working in PIC18F2431

 
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bells_electronics



Joined: 05 Dec 2009
Posts: 40

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ADC is not working in PIC18F2431
PostPosted: Sat Sep 03, 2011 8:43 am     Reply with quote
hey guy ADC is not working in PIC18F2431 plzz help me

Code:

#include<18F2431.h>
#device adc=10

#fuses NOWDT, NOPROTECT, NOBROWNOUT, PUT, NOLVP
#use delay(clock=20MHz , crystal)

#define LED PIN_B7
unsigned int16 adc(void);
unsigned int16 adc_value;
 
void main()
{
 set_tris_a (0xFF);
 set_tris_b (0x00);
 
 setup_adc(ADC_CLOCK_INTERNAL);
 setup_adc_ports(sAN0);

while(TRUE)
 {
  set_adc_channel(0);   
  delay_us(20);
  adc_value = adc();
  if(adc_value > 512)
   output_high(LED);
  else
   output_low(LED);
  delay_ms(100);
 }
}

unsigned int16 adc()
 {
  read_adc(ADC_START_ONLY);
  while(!adc_done());
  return read_adc(ADC_READ_ONLY);
 }
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Sep 03, 2011 1:12 pm     Reply with quote
Try a simple program that just calls read_adc(), instead of breaking it up
into several calls to minor adc functions. Here is an example:
http://www.ccsinfo.com/forum/viewtopic.php?t=42952&start=1

Also post your compiler version.
Ttelmah



Joined: 11 Mar 2010
Posts: 19540

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PostPosted: Sun Sep 04, 2011 8:18 am     Reply with quote
Also, have you verified that the rest of the circuit is working. A simple one second delay, light the LED, one second delay, turn off the LED, and loop?. Things that could stop the code from apparently working include:
1) LED without a current limiting resistor - chip resets each time it is turned on, result it apparently doesn't work.
2) No pullup on MCLR.
3) Oscillator not actually working.
etc. etc..

Best Wishes
temtronic



Joined: 01 Jul 2010
Posts: 9243
Location: Greensville,Ontario

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PostPosted: Sun Sep 04, 2011 10:25 am     Reply with quote
Also is this a REAL circuit and NOT a Proteus 'simulation'?

Show the schematic of the real layout might help as well.
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