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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 11:59 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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treitmey
Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA
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| Posted: Wed Feb 08, 2006 12:16 pm |
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I changed the header and a little of the code. This works.
I don't think the code is bad.
Check MCLR and clock. The caps should agree with the crystal's spec sheet. NOT and arbitrary schematic. Does that make sense?
| Code: | #include <16F877a.h>
#device *=16 //not needed for now.
#use delay(clock=4000000)
#fuses hs,nowdt,nolvp,protect,put,brownout
#use rs232(baud=19200,xmit=PIN_C6,rcv=PIN_C7) // STDERR(same as DEBUG)
#case
#zero_ram
//#include <16f877a.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_B0);
output_high(PIN_B0);
while (TRUE) {
output_toggle(PIN_B0);
output_toggle(PIN_B1);
delay_ms(1000);
}
} |
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digitalfreak
Joined: 16 Feb 2005
Posts: 25
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| Posted: Wed Feb 08, 2006 12:48 pm |
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thx treitmey for your response....
NOW changed to PIC 16F876A, using 20MHz crstal with 33pF. I still could not see output high on B1.
I see 5V at MLCR , clock is good (checking volatge at pins 9 and 10 ~2.5, ~2.4)
| Code: | #include <16F876A.h>
#device adc=16
#use delay(clock=20000000)
#fuses NOWDT, HS, PUT, NOPROTECT, BROWNOUT, NOLVP, NOCPD, NOWRT
#use rs232(baud=19200,xmit=PIN_C6,rcv=PIN_C7) // STDERR(same as DEBUG)
#case
#zero_ram
#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_B0);
output_high(PIN_B1);
while (TRUE) {
output_toggle(PIN_B0);
output_toggle(PIN_B1);
delay_ms(1000);
}
} |
Iam just trying to see HIGH on at least one pin to make sure things are working to start my project....I could not EVEN GET STARTED...
help... |
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treitmey
Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA
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| Posted: Wed Feb 08, 2006 1:42 pm |
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This code works. Can't get much smaller. I have the wrong freq and wrong chip and it still works for me. Have you put +5 and ground all the places it needs to be?
| Code: | #include <16F876A.h>
#use delay(clock=20000000)
#fuses HS,NOLVP
void main () {
output_high(PIN_B0);
while (TRUE) {
}
}
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digitalfreak
Joined: 16 Feb 2005
Posts: 25
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| Posted: Wed Feb 08, 2006 2:17 pm |
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thanks treitmey
no change in circuitry .... works brilliant.!! now need to jump start on things...i still donot know whats wrong with previous code?
thanks again... |
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