Unable to wake up with LPTMR0

[rogerpease]

I am using an MKL24Z64VLH4 with KDS 3.1.0.

I have a simple routine which I am trying to debug:

1) Go to sleep.

2) Use LPTMR0 to wake me up.

while (1) {

	AS1_BlockSent = 0;
	LDD_TError sendError = AS1_SendBlock(AS1_DeviceData,"Sleeping\r\n",10);
	while (AS1_BlockSent == 0) {  }
	// Now go to sleep.
	Cpu_SetClockConfiguration(1);
	Cpu_SetOperationMode(DOM_STOP,NULL,NULL);

	//
	// TU2 is programmed... so why don't I wake up?
	//
	Cpu_SetClockConfiguration(0);

}

I have TU2 programmed as LPTMR0 with the interrupt enabled.

And it's set to Auto-init. I also have the LLWU interrupt enabled in the CPU configuration

I've also tried ensuring I use the BLPI Clock (I have two clock configs- one is for low power mode, the other for normal operation).

I also considered the possibility that I was waking up but just not seeing my message because of the change in clock configurations messing with the baud rate, but if I remove the DOM_STOP instruction the Serial port is fine.

Thoughts on what I may be doing wrong? I can supply a sample project if necessary.

Thanks,

Roger

[mjbcswitzerland]

Roger

The LPTMR only operates when clocked by a source that also runs in the low power mode - check that it is not configured to run from one that is stopped in the mode that you use.

Regards

Mark

[jeremyzhou]

Hi Roger,

Thank you for your interest in NXP Semiconductor products and the opportunity to serve you.

I was wondering if you can sharing the demo, then I can debug with the FRDM-KL26 on my site.

I'm looking forward to your reply.

Have a great day,
Ping

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------