TWR-K60 KDS The PLL/FLL clock value is 0 - the clock is disabled Warning

[kashyapgada]

Hello, I am new to Kinetis Design Studio. I started off by following the tutorial on this link http://cache.freescale.com/files/soft_dev_tools/doc/user_guide/PEXDRVGETSTARTEDUG.pdf

The clock settings within this tutorial give me a warning

Description	Resource	Path	Location	Type
Warning: The PLL/FLL clock value is 0 - the clock is disabled. (Clock frequency [MHz])	k60_uart_adc		Cpu/Clock frequency [MHz]	Processor Expert Problem

Everything else within the project is fine. But the code isnt working. the code building doesnt seem to work. I am confused.

Please help or guide if more information required. The default clock settings of processor expert doesnt make the k60 run at full 100mhz,. Can you please suggest how to get rid of this issue. I am exactly following the project on the above mentioned link

[kashyapgada]

The System works on internal clock, if I shift to external clock the code keeps looping in cpu_init function waiting for the clock to be ready. In default cpu settings at a frequency of 28Mhz the program works fine. So donot understand what is the issue, is it the board? I am working on a board which has a defective external clock?

[BlackNight]

Hello,

I believe you have not configured the PLL/FLL clock output settings. See my settings below (using PLL 0): I have configured it here to 120 MHz (my K60F120M runs at 120 MHz):

This configures which clock is feed to the peripherals, e.g. USB or in your case the UART.

The following articles touch on this aspect:

• FRDM-K64F at Maximum Speed of 120 MHz | MCU on Eclipse
• http://mcuoneclipse.com/2013/07/10/usb-msd-host-for-the-frdm-k20d50m-board/
• USB with the TWR-K60F120M and TWR-K70F120M | MCU on Eclipse

I hope this helps,

Erich

[kashyapgada]

Hello. Thanks for the helpful reply. I tried replicating clock settings as you've shown but still I am having same issue, the PLL/FLL Clock selection remains 0 disabled I am attaching 2 pictures. first was Clock Source Settings->External Reference Clock which you have not mentioned values of.. In that case in one of the links you sent ERCLK32 value is set to 50MHz but when i set that value that is not being accepted and another is the main issue for which I had started the thread.

Regards

[BlackNight]

Which TWR-K60 board are you using? There are different boards around for the K60.

So my settings might not apply for your TWR board.

And it is easier if you do not use the tabbed view, see http://mcuoneclipse.com/2014/06/20/switching-between-tabs-and-no-tabs-ui-in-processor-expert/

Erich

[kashyapgada]

Yes, The advanced mode was not selected.

I have set cpu settings as given by you. Here in the pic you can see it settings I have done.

2 issues.

1. ERCLK32 Clock Settings in pic 1 says that ERCLK32K should be withing 40KHz. whereas the system oscillator is 50Mhz.  Also in the 3rd pic above erclk32 remains 0. Does this thing create any issue?

2. The code in debug mode stops keeps waiting at this condition

  while((MCG_S & MCG_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */

  }

I dont understand what I am doing wrong. The Processor Expert Default code without modifications runs fine but at a lower speed. I want to make it run at 100MHz.

[kashyapgada]

Another thing that I noticed by changing from tabbed view to the list view was many of the options available in the tabbed view were missing in the list view. Any pointers for that?

In my previous reply, you can observe that in the PLL/FLL Selection under Clock Configuration/System Clocks shows the FLL is selected by default. Should this place have PLL clock?

Please Help!

[BlackNight]

Hello,

have you enabled 'Advanced' mode?

Erich

[kashyapgada]

It's a Chinese development kit with k60d512 with 50mhz oscillator and 32k oscillator for rtc. I had selected the chip directly while creating the project. The new project with default clock setting works fine art 40mhz. And when I change clocks it doesn't work because of this issue.