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Generating 50Hz by calling Timer0 Interrupt

 
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karimpain



Joined: 15 Feb 2012
Posts: 39
Location: italia

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Generating 50Hz by calling Timer0 Interrupt
PostPosted: Tue Jun 19, 2012 5:42 pm     Reply with quote
Hello Everybody!
I want to generate a 50hz signal using timer0, and I want to vary the duty cycle of the signal from 1ms to 2ms(servo control). I didn't test it, so I want to take in consideration all of your opinions because really I didn't understand timer0 so much, this is the code:
Code:

#include <16F877a.h>
//#device adc=10
#Fuses HS,NOPROTECT,NOWDT,NOLVP
#use delay(clock=20000000)
int32 x=0;

#int_timer0
void timer0_isr()
{
x=x+1;
if(x>2500)
 {
  output_low(pin_b6);
 }
  if(x<2500)
 {
  output_high(pin_b6);
 }
if(x==50000) //each 50000 counts equal 20ms
{
x=0;//reset count each 20ms
}

void main()
{
set_tris_b(0x00);
setup_timer_0(rtcc_internal | rtcc_div_2);
set_timer0(255);//         interrupt will called each 0.4us
enable_interrupts(global);
enable_interrupts(int_timer0);
while(1)
{
}
}

Thax 4 reading !!
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Jun 19, 2012 6:03 pm     Reply with quote
50 Hz software PWM using Timer0:
http://www.ccsinfo.com/forum/viewtopic.php?t=37807&start=3

Servo examples using the CCP module in Compare mode:
http://www.ccsinfo.com/forum/viewtopic.php?t=34560&start=22
http://www.ccsinfo.com/forum/viewtopic.php?t=44328
Mike Walne



Joined: 19 Feb 2004
Posts: 1785
Location: Boston Spa UK

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PostPosted: Wed Jun 20, 2012 3:02 pm     Reply with quote
Quote:
I want to generate a 50hz signal using timer0, and I want to vary the duty cycle of the signal from 1ms to 2ms(servo control). I didn't test it, so I want to take in consideration all of your opinions because really I didn't understand timer0 so much, this is the code:

You don't tell us how many steps you want from 1ms to 2ms.

Mike
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