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a very basic code not working? 16F870

 
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digitalfreak



Joined: 16 Feb 2005
Posts: 25

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a very basic code not working? 16F870
PostPosted: Wed Feb 08, 2006 11:58 am     Reply with quote
I have used (Mplab, picstartplus, CCS c compiler) a while ago, now kind of of lost touch completely...please help what am I doing wrong?


Code:
#include <16f870.h>
#device adc=8
#use delay(clock= 4000000, restart_wdt)
#fuses NOWDT, XT, PUT, NOPROTECT, BROWNOUT, NOLVP, NOCPD, NOWRT
#include <math.h>

#use fast_io(A)
#use fast_io(B)
#use fast_io(C)

void main () {

  set_tris_a(0b00111110);
  set_tris_b(0b11111100);
  set_tris_c(0b00000000);         

  setup_adc(ADC_CLOCK_INTERNAL);
  setup_adc_ports(NO_ANALOGS);
 
  output_low(PIN_B1); 

  while (TRUE) {     
    output_high(PIN_B1);
    delay_ms(10);
  }
}



just to be sure

pin 1 - pulled high to vdd (5V) using 5.1K rresistor
8 and 19 - ground
9 and 10 - 4MHz crystal and 33pF caps as shown in data sheet
20 vdd(5V)

I couldnot see HIGH (5V) on PIN_B1 what the heck....

I have programmed before and made few working circuits, this is killing me...

what could go wrong?

thx
sonicdeejay



Joined: 20 Dec 2005
Posts: 112

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PostPosted: Sat Feb 11, 2006 12:54 pm     Reply with quote
trying taking out...

Code:
set_tris_a(0b00111110);
  set_tris_b(0b11111100);
  set_tris_c(0b00000000);


and run it....??

Measure it again,,,

I ain't no expert..just a suggestion... Very Happy
Ttelmah
Guest
PostPosted: Sat Feb 11, 2006 4:20 pm     Reply with quote
The program as written should work.
He has fast_io selected, so needs the TRIS statements. B1, is correctly set as an output.
Realistically, at this point one would be looking for something faulty. A crystal not oscillating. A chip that is damaged. An IC socket that is not actually making good contact. A supply that is not quite good enough, triggering a brownout. Inadequate decoupling, causing the chip to reset.
What compiler version?. if old, there might be a problem here.

Best Wishes
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