PWM conflict

[Dwayne]

Hello Srig,

Srig>>Hi Dwayne, Thanks for your reply. Here is the thing. when I only try to control one of the LED with PWM to turns it on and off smoothly and the program works fine.. but when I try to control two of them at the same time.. I am noticing flickering and not getting what I wanted. I dont know why this is the case. I konw I have the code fine with compliance with PBP. Can anyone help me with some answers.. thanksss in <<

Ok, this explains everything.... Remember when I said in a Software PWM, you must wait until the entire command is done? What you are doing, is switching between two LED's and because of the time it takes to switch, you are getting this "Flickering" effect. In other words the Software PWM can Probably only handle 1 LCD at a time on the "Fade" effect.

If you had a hardware PWM, you would have no probems at all. Hardware PWMS operate continuosly, while your chip does other things. Thus, while your chip is switching loops, Jumping around in the program, your PWM is still outputting a continuous stream of Pulses. (Software PWM can't do this).

You *may* be able to adjust your "Cycle" to make the "Flickering" less noticeable", but between your Duty Cycle and your Cycling, it may be difficult to remove this "Flicker" to the eye using two LCD's... and the problem compounds itself, the more Pins you use to simulate a Software PWM...

Dwayne

Dwayne