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Unable to get PWM to work with ext crystal-only configuration

Question asked by dave408 on Jun 24, 2015
Latest reply on Jul 1, 2015 by dave408

I've been reading up on the various clock configurations, and currently I am trying out a project for fun that uses the UART at 115.2kbps and a PWM channel at 20MHz.  I only want to use a 32khz external crystal, connected to EXTAL32.  I am using a FRDM-K64F for testing.

 

I believe I have all of the clock configuration parameters set properly.  My main loop sends 0x55 over the UART and that works as expected.  However, when I try to start my PWM channel, nothing happens.  I'm using it just as I do in other projects (which work), and I basically just call:

 

FTM_DRV_PwmStart(FSL_FLEXTIMER1, &flexTimer1_ChnConfig0, 1);

 

I'm using the following FTM configuration:

 

(all of the other pins are unchecked)

 

'

These are the settings I have used in other projects, which do work properly.


I've attached my project, in case anyone has time to import it and take a look.  Thank you!

Original Attachment has been moved to: KDS3_crystal_test.zip

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