Hi all,

I am driving stepper motor that requires H to L transition to do stepping. =
I used pic 32 core timer and it works
fine now my co worker wants me to change it to hardware PWM instead of usin=
g timer. well sounds ok until
when I started changing the frequency on PWM the result I got all unknown. =
like frequency is too off or duty cycle
is moved after changing the frequency. the duty cycle is half the period. b=
asically the user is going to change the frequency
on stepper motor from 20hz to 2khz and I noticed that hardware pwm is its l=
imits. according to my co worker hardware pwm
is flexible and based on my test it is not going to give 20hz to 2k output.=
 some frequencys are not even close.
using time I am able to get accurate frequency but it is using interrupt an=
d they worry about it. my question is
how do you guys calculate hardware pwm to get accurate result that always i=
s going to output 50% duty cycle and
close frequency. I am using pic32mx =A080mhz


any idea?

thanks

AA
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.