topic MPC5554 - PWM eTPU Function in Other NXP Products

MPC5554 - PWM eTPU Function

n_ — Tue, 30 Oct 2007 22:01:30 GMT

I want to create an interrupt for each rising edge of the PWM signal using PWM eTPU function. I have read many eTPU Application Notes and the eTPU Reference Manual, but I can't find the solution.

How can I do that? What register do I need to configure or what API do I need to use?

Please guide me the solution and what document it is mentioned.

Thanks,

Re: MPC5554 - PWM eTPU Function

mr_venkatarao — Wed, 31 Oct 2007 18:14:34 GMT

Hello n ..in micro code entry point...i.e in if ,if else conditions you have to use the following assembly code #asm

cir.

#endasm

for eg...............

if()

{

\---

----

}

else if(m1==1&&m2==0)

{

#asm

cir.

#endasm

}

else if(m1==0&&m2==1)

{

#asm

cir.

#endasm

}

so this willl generate interrupt at both rising edge and falling edge of pwm signal..uoy can generate only at either edge also... hope this will help you.

regards,

venki

Re: MPC5554 - PWM eTPU Function

mr_venkatarao — Wed, 31 Oct 2007 18:21:40 GMT

And you can also generate squre wave with linearly increasing with time..

it is so simple just you have to increase period and it's duty cycle periodically...if you are writing micro code on your own it is so simple insted of using freescale code API.

regards,

venki

Re: MPC5554 - PWM eTPU Function

n_ — Fri, 09 Nov 2007 18:22:44 GMT

Thank power pc for all useful information in your posts.

It's the first time I programs for eTPU. I don't have any book about programming for eTPU. I have just read eTPU_RM and Application Notes about eTPU functions and try to understand by my way.

Please explain for me more about micro code entry point and m0 and m1 in your code. I see m0 and m1 is the last value and current value of the PWM signal, but how to read it from eTPU channel.

According to you, what document or book are useful for me to have enough knowledge to program eTPU?

Thanks and regards,

Re: MPC5554 - PWM eTPU Function

mr_venkatarao — Tue, 13 Nov 2007 13:37:15 GMT

Hi find the etpu examples in code warrior ide and download the bytecraft copmiler in the site given http://www.bytecraft.com/depot/depot.php.

Write micro code in byte craft compiler then it generares .h file, include the same in the main project.

Initialisation for the channels and channel paramater base address everything is given in that example..follow the same.

{

}

else if

{

}

else

{

}

these are entry point....

{

contains chnnel and function initilisation..like either i/p or o/p,which tcr to be used etc..

}

else if

{

contians incrementing period value foe the next match

}

else

{this is also as same as above..

}

so better to understand example given..

regards,

venki