TWR-K60N512 and KSDK Demo Apps

[weblar]

I'm trying to get some KSDK demo apps up and running on my TWR-K60N512 tower stack (together with TWR-SER). Used the online configurator tool to generate the basic KSDK framework for the TWR-K60D100M (which I assume is the correct choice as the TWR-K60N512 option was not available to me).

When debugging any demo application, a hard fault occurs when calling the BOARD_BootClockRUN function, more specifically in the CLOCK_SetExternalRefClkConfig call within the CLOCK_BootToPeeMode function. 

As far as I know, the tower stack is configured correctly (50MHz EXTAL connected to CLKIN0 on elevator for ethernet) and all other jumpers set to their defaults.

Could anyone suggest what I'm missing?

Thanks.

[weblar · Accepted solution]

Ok, so I've managed to work around the issue - I've modified the following function and everything seems to work as expected.

status_t CLOCK_SetExternalRefClkConfig(mcg_oscsel_t oscsel)
{
bool needDelay;
uint32_t i;

#if (defined(MCG_CONFIG_CHECK_PARAM) && MCG_CONFIG_CHECK_PARAM)
/* If change MCG_C7[OSCSEL] and external reference clock is system clock source, return error. */
if ((MCG_C7_OSCSEL_VAL != oscsel) && (!(MCG->S & MCG_S_IREFST_MASK)))
{
return kStatus_MCG_SourceUsed;
}
#endif /* MCG_CONFIG_CHECK_PARAM */

// #######

// FIX - RETURN EARLY AS THE FOLLOWING CAUSES A HARD FAULT

// #######

return kStatus_Success;

if (MCG_C7_OSCSEL_VAL != oscsel)
{
// If change OSCSEL, need to delay, ERR009878.
needDelay = true;
}
else
{
needDelay = false;
}

MCG->C7 = (MCG->C7 & ~MCG_C7_OSCSEL_MASK) | MCG_C7_OSCSEL(oscsel);
if (kMCG_OscselOsc == oscsel)
{
if (MCG->C2 & MCG_C2_EREFS_MASK)
{
while (!(MCG->S & MCG_S_OSCINIT0_MASK))
{
}
}
}

if (needDelay)
{
/* ERR009878 Delay at least 50 micro-seconds for external clock change valid. */
i = 1500U;
while (i--)
{
__NOP();
}
}

return kStatus_Success;
}

[stnslv]

Hello, I don't know how stable is this solution but it helped me to get my code running. The problem is that MCG_C7_OSCSEL_VAL appears in the code not only one time. After fixing the clock initialization I got a problem with the UART initialization.

The TWR-K60N512, as I know, has some old Kinetis MCU. My board has revision D and uses the PK60N512VMD100 (Mask set 0M33Z). This MCU just doesn't have register MCG_C7. I expect that you use the same MCU. The best solution is maybe to switch to the TWR-K60D100M with newer MCU.

This Application Note explains the problem (https://www.nxp.com/docs/en/application-note/AN4526.pdf)

Best regards!