topic Re: CLOCK_SYS_GetBusClockFreq() returns 0 in KSDK 1.1 in Kinetis Microcontrollers

CLOCK_SYS_GetBusClockFreq() returns 0 in KSDK 1.1

marcohess — Wed, 11 Feb 2015 05:43:13 GMT

I ported a project from KSDK 1.0 to 1.1 (in KDS 2.0) and am running into some trouble during the PDB initialisation.

Previously using KSDK 1.0, CLOCK_SYS_GetBusClockFreq() returned the correct 60MHz and I can calculate the correct PDB MOD value.

Now with KSDK 1.1 it returns 0.

I traced through the CLOCK_SYS_GetBusClockFreq() call but it goes through so many levels of lower level functions, I can't make sense of it anymore.

What's wrong?

Re: CLOCK_SYS_GetBusClockFreq() returns 0 in KSDK 1.1

Alice_Yang — Wed, 11 Feb 2015 06:40:32 GMT

Hi Marco,

You'd better don't port the KSDK1.0 project to KSDK1.1, they are not incompatible.

Sorry for the inconvenient for you !

Have a great day,
Alice

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Re: CLOCK_SYS_GetBusClockFreq() returns 0 in KSDK 1.1

marcohess — Wed, 11 Feb 2015 07:28:49 GMT

In the mean time I found I needed the following in my hardware_init():

/* Setup board clock source. */

g_xtal0ClkFreq = 8000000U;

g_xtalRtcClkFreq = 32768U;

The bus clock now properly returns the 60MHz value I was expecting.

But I am stilling having trouble with the PDB when I enable the DMA trigger of the PDB.

Re: CLOCK_SYS_GetBusClockFreq() returns 0 in KSDK 1.1

Alice_Yang — Wed, 11 Feb 2015 09:03:45 GMT

Hi Marco,

The driver function between SDK1.0 and SDK1.1 are different , so it hared to porting .

So recommend create a new project about SDK 1.1 refer to the previous project.

Alice