topic Software stuck at function CLOCK_SYS_BootToPee() at startup in Kinetis Microcontrollers

Software stuck at function CLOCK_SYS_BootToPee() at startup

ksk10 — Mon, 22 May 2017 08:56:29 GMT

I am currently working on a custom hardware with Mk64fn1m0vll12 controller.

I have imported the gpio driver example project for frdm k64 board and changed the gpio pin to toggle led on one of the port pins.

When i start to debug the software , the code get stuck at CLOCK_HAL_GetFllSrc(MCG) . It continuously loops in the while loop where the above function is called.

Kindly suggest a workaround for this problem. Am I missing something for development on a custom hardware, or I can use the example project for frdmk64 as it is .

Re: Software stuck at function CLOCK_SYS_BootToPee() at startup

mjbcswitzerland — Mon, 22 May 2017 12:54:43 GMT

The FRDM-K64F has a 50MHz external oscillator as clock. If you use the same clock initialisation code for your board you will need to ensure the same 50MHz clock signal is available.

Regards

Mark

Re: Software stuck at function CLOCK_SYS_BootToPee() at startup

ksk10 — Tue, 23 May 2017 10:11:22 GMT

Hi,

Thank you for the prompt response.

I am relatively new to kds , how can I set the clock frequency for my hardware.

Which ksdk APIs i need to refer. I am using a 25Mhz crystal .

I am also trying to use Processor expert, how do I set clock frequency in PE.

Regards,

Sanket

Re: Software stuck at function CLOCK_SYS_BootToPee() at startup

mjbcswitzerland — Tue, 23 May 2017 17:03:12 GMT

No idea about the settings in the mentioned frameworks/case tools.

In teh uTasker project the K64F with 50MHz is set up like this:

        #define EXTERNAL_CLOCK       50000000                            // this must be 50MHz in order to use Ethernet in RMII mode
        #define _EXTERNAL_CLOCK      EXTERNAL_CLOCK
        #define CLOCK_DIV            20                                  // input must be divided to 2MHz..4MHz range (/1 to /24)
        #define CLOCK_MUL            48                                  // the PLL multiplication factor to achieve operating frequency of 120MHz (x24 to x55 possible)
        #define FLEX_CLOCK_DIVIDE    3                                   // 120/3 to give 40MHz
        #define FLASH_CLOCK_DIVIDE   5                                   // 120/5 to give 24MHz

To use 25MHz clock (which can't be used with Ethernet RMII) it needs:

        #define EXTERNAL_CLOCK       25000000                            // this would need to be 50MHz in order to use Ethernet in RMII mode !!!!!!!
        #define _EXTERNAL_CLOCK      EXTERNAL_CLOCK
        #define CLOCK_DIV            10                                  // input must be divided to 2MHz..4MHz range (/1 to /24)
        #define CLOCK_MUL            48                                  // the PLL multiplication factor to achieve operating frequency of 120MHz (x24 to x55 possible)
        #define FLEX_CLOCK_DIVIDE    3                                   // 120/3 to give 40MHz
        #define FLASH_CLOCK_DIVIDE   5                                   // 120/5 to give 24MHz

Regards

Mark

Re: Software stuck at function CLOCK_SYS_BootToPee() at startup

Jorge_Gonzalez — Thu, 25 May 2017 16:32:04 GMT

Hello Sanket K,

If you are working with KSDK v1.3 and Processor Expert, the next document might be helpful to understand clock configurations:

https://community.nxp.com/docs/DOC-329554

Regards!

Jorge Gonzalez