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digitalfreak
Joined: 16 Feb 2005 Posts: 25
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a very basic code not working? 16F870 |
Posted: Wed Feb 08, 2006 11:58 am |
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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 |
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sonicdeejay
Joined: 20 Dec 2005 Posts: 112
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Posted: Sat Feb 11, 2006 12:54 pm |
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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](images/smiles/icon_biggrin.gif) |
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Ttelmah Guest
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Posted: Sat Feb 11, 2006 4:20 pm |
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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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