LPC MicrocontrollersのトピックRe: Generating six-channel PWM using LPC824's SCT/PWM

Generating six-channel PWM using LPC824's SCT/PWM

valerio — Tue, 05 Sep 2017 09:59:30 GMT

Hello everybody,

this is my first ever discussion on NXP Community. I'm a bachelor student from Italy and I'm facing a few problems with my final project.

I need to generate a six-channel PWM with the SCT provided by LPC824 (LPCXpresso824-max board) but, even if the LPCXpresso IDE signals no errors, my oscilloscope detects no PWM wave at the output of my board.

I'll link my code so you can better understand what I did. Just as an example, in the code, duty cycle values are set to 50%

Is there anything I can do to fix it?

Thank you for your help

Original Attachment has been moved to: sct.c.zip

Original Attachment has been moved to: main.c.zip

Re: Generating six-channel PWM using LPC824's SCT/PWM

kerryzhou — Wed, 06 Sep 2017 06:16:46 GMT

Hello Valerio Campomaggiore,

I think you can test the official sample code at first, whether it works on your side.

You can download the code bundle :

http://www.nxp.com/downloads/en/software/LPC824_Example_Code_Bundle_LPCXpresso_r1.0.zip

The SCT_PWM project, whether it works on your side, if it works, you can modify the official code, then check it again.

Please try it at first.

If you still have question, please let me know!

Have a great day,
Kerry

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Re: Generating six-channel PWM using LPC824's SCT/PWM

kerryzhou — Wed, 06 Sep 2017 06:19:39 GMT

You also can refer to the application note SCTimer PWM cookbook :

http://cache.nxp.com/docs/en/application-note/AN11538.zip?fsrch=1&sr=7&pageNum=1

Have a great day,
Kerry

Re: Generating six-channel PWM using LPC824's SCT/PWM

valerio — Wed, 06 Sep 2017 10:23:31 GMT

Hello Kerry Zhou,

thank you for your answer. I edited my code and now it seems to work as I wanted.

Have a nice day,

Valerio

Re: Generating six-channel PWM using LPC824's SCT/PWM

kerryzhou — Fri, 08 Sep 2017 02:32:12 GMT

HI Valerio,

That's very good to hear you make it work.

And thank you for your updated information.

Have a great day,
Kerry