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Help me with a TMR0 PWM ADC problem

 
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souyirouh



Joined: 13 Aug 2013
Posts: 2

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Help me with a TMR0 PWM ADC problem
PostPosted: Tue Aug 13, 2013 11:45 am     Reply with quote
I'm trying to do a PWM control for a servo so i end up doing it with the TMR0 cause in my opinion is the most exactly but i don't know exactly what is the problem with my program. It doesn't show any error and the logic behind it is good or at least i think so, anyway when i try to simulate it in Proteus it doesn't send the PWM signal, the TMR0 interrupt should appear each 0.1 that's why i put set_timer0(6) . I hope someone could help me here.

Code:

#include <16f877.h>
#device adc=10
#fuses HS,NOWDT,PUT,NOPROTECT,NOLVP,NOBROWNOUT,NOWRT
#use delay(clock=20000000)

#define MAX_VALUE 200

#int_TIMER0
int pulse_max=0;
int16 adc=0,pulse_top=10; //min
void TIMER0_isr(void) {
         
if (pulse_max<=pulse_top)
   output_high(PIN_B0);
else
   output_low(PIN_B0);

if (pulse_max>=MAX_VALUE)
   pulse_max=0;

pulse_max++;
set_timer0(6);
}

void main(){
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_2);
enable_interrupts(INT_TIMER0);
enable_interrupts(GLOBAL);
set_timer0(6);
setup_adc_ports(AN0);
setup_adc(ADC_CLOCK_INTERNAL);

for(;;){
  set_adc_channel(0);
  delay_us(20);
  adc=read_adc();
  pulse_top=(10*adc+10230)/1023;
  //x= (max-min)adc + 1023*min )/1023
 }

}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Aug 13, 2013 12:35 pm     Reply with quote
Quote:

#int_TIMER0
int pulse_max=0;
int16 adc=0,pulse_top=10; //min
void TIMER0_isr(void) {

Read this post:
http://www.ccsinfo.com/forum/viewtopic.php?t=46477&start=4
souyirouh



Joined: 13 Aug 2013
Posts: 2

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PostPosted: Tue Aug 13, 2013 12:58 pm     Reply with quote
GOD BLESS YOU MAN !!!!!

PCM programmer wrote:
Quote:

#int_TIMER0
int pulse_max=0;
int16 adc=0,pulse_top=10; //min
void TIMER0_isr(void) {

Read this post:
http://www.ccsinfo.com/forum/viewtopic.php?t=46477&start=4
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