Interrupt programming help

[Rohith_elec]

What is the difference between software interupt and hardware interrupt ?
is the software interrupt initiated when a condition inside a code is satisfied ?
can anyone provide an example ?

thank you
Rohith

 

[Neyolight]

An example of software interrupt:
When the Timer 1 of PIC18F4620 gets overflowed, it automatically sets the INTCONbits.TMR0IF to 1.

Hardware interrupt is more like , pressing buttons on demo boards ( from an external stimuli)

 

[Rohith_elec]

can the software interrupt can be of any number ?

 

[Neyolight]

can the software interrupt can be of any number ?

What do you mean by any number? You have high, low priority on the interrupts. You can also select high-to-low or the other way round !

 

[Rohith_elec]

ok , i was asking that 5 different pushbutton and 5 different actions on each like , controlling an LED , controlling a motor , pwm on led and so forth

 

[Neyolight]

Hmm sure you can ! Controlling a motor, PWM would require a lot of coding but you can certainly do that!

 

[Rohith_elec]

Can the below code can be used for PWM ?

void pwm(int c)
{
output_high(PIN_B0);
delay_us(30);
output_low(PIN_B0);
delay_us(c);
}


by varying the delay , can we adjust the duty cycle ?

 

[Neyolight]

If its a function then you need a "return;" at the end of your pwm function!

Yup, I see no reason that will not work.

 

[Rohith_elec]

for an application like LED or motor , do i need to set the frequency (PWM frequency)?