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PWM using PIC with out CCP module ???

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sahu

sahu

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how can use PWM using PIC with out CCP module ???
my aim controlling brightness of power led.
 

When you use CCP, you're using the hardware PWM. So, for PWM without CCP module, use software PWM. One way would be to use a timer. Have the timer interrupt at the end of each period. Depending on the time required, keep output on and off as required.

Check this out:

AN1074 - Software PWM Generation for LED Dimming and RGB Color Applications
**broken link removed**

Hope this helps.
Tahmid.
 

Dear Sahu

You have use timer to get the pulse. Something like this one

Here is sample

int i;
int percent;

percent = 52; // % time on
while(1) // loop forever
{
for (i=0; i>100; i++)
{
if (i < percent)
{
ra0 = 1; // turn bit on
}
else
{
ra0 = 0; // turn bit off
}
delay_ms(1); //some sort of delay here, determines freq
}

This will definately help you.
:) ))
 

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