MK10 PLL clock configuration

[davithakobyan]

Hi,

I try to run a sample project for MK10DN512VLL10 by configuring the clock to use the external OSC and run at 100 MHz of PLL. However, the execution hangs in a while loop for waiting the clock source to be set to external clock reference. The relevant parts are as follows:

Configuration part

const mcg_config_t mcgConfig_BOARD_BootClockRUN =
    {
        .mcgMode = kMCG_ModePEE,                  /* PEE - PLL Engaged External */
        .irclkEnableMode = MCG_IRCLK_DISABLE,     /* MCGIRCLK disabled */
        .ircs = kMCG_IrcSlow,                     /* Slow internal reference clock selected */
        .fcrdiv = 0x1U,                           /* Fast IRC divider: divided by 2 */
        .frdiv = 0x0U,                            /* FLL reference clock divider: divided by 1 */
        .drs = kMCG_DrsLow,                       /* Low frequency range */
        .dmx32 = kMCG_Dmx32Default,               /* DCO has a default range of 25% */
        .oscsel = kMCG_OscselOsc,                 /* Selects System Oscillator (OSCCLK) */
        .pll0Config =
            {
                .enableMode = kMCG_PllEnableIndependent,/* MCGPLLCLK enabled independent of MCG clock mode, MCGPLLCLK disabled in STOP mode */
                .prdiv = 0x3U,                    /* PLL Reference divider: divided by 4 */
                .vdiv = 0x1aU,                    /* VCO divider: multiplied by 50 */
            },
    };
const sim_clock_config_t simConfig_BOARD_BootClockRUN =
    {
        .pllFllSel = SIM_PLLFLLSEL_MCGFLLCLK_CLK, /* PLLFLL select: MCGFLLCLK clock */
        .er32ksrc=SIM_OSC32KSEL_OSC32KCLK_CLK,  /* OSC32KSEL select: OSC32KCLK clock */
        .clkdiv1 = 0x1130000U,                    /* SIM_CLKDIV1 - OUTDIV1: /1, OUTDIV2: /2, OUTDIV3: /2, OUTDIV4: /4 */
    };
const osc_config_t oscConfig_BOARD_BootClockRUN =
    {
        .freq = 8000000U,                         /* Oscillator frequency: 8000000Hz */
        .capLoad = (OSC_CAP0P),                   /* Oscillator capacity load: 0pF */
        .workMode = kOSC_ModeExt,                 /* Use external clock */
        .oscerConfig =
            {
                .enableMode = OSC_ER_CLK_DISABLE, /* Disable external reference clock */
            }
    };

Setting up the clock

void BOARD_BootClockRUN(void)
{
    /* Set the system clock dividers in SIM to safe value. */
    CLOCK_SetSimSafeDivs();
    /* Initializes OSC0 according to board configuration. */
    CLOCK_InitOsc0(&oscConfig_BOARD_BootClockRUN);
    CLOCK_SetXtal0Freq(oscConfig_BOARD_BootClockRUN.freq);
    /* Configure FLL external reference divider (FRDIV). */
    CLOCK_CONFIG_SetFllExtRefDiv(mcgConfig_BOARD_BootClockRUN.frdiv);
    /* Set MCG to PEE mode. */
    CLOCK_BootToPeeMode(mcgConfig_BOARD_BootClockRUN.oscsel,
                        kMCG_PllClkSelPll0,
                        &mcgConfig_BOARD_BootClockRUN.pll0Config);
    /* Set the clock configuration in SIM module. */
    CLOCK_SetSimConfig(&simConfig_BOARD_BootClockRUN);
    /* Set SystemCoreClock variable. */
    SystemCoreClock = BOARD_BOOTCLOCKRUN_CORE_CLOCK;
}

The problem occurs in the above CLOCK_BootToPeeMode function. Particularly, it hangs in the following check:

    while ((MCG->S & (MCG_S_IREFST_MASK | MCG_S_CLKST_MASK)) !=
           (MCG_S_IREFST(kMCG_FllSrcExternal) | MCG_S_CLKST(kMCG_ClkOutStatExt)))
    {
    }

Does anyone know the reason why it is not possible to set the external ref. clock?

Does anyone have a working clock initialization procedure which one could use?

Thanks a lot in advance.

[Robin_Shen]

Hi davithakobyan,

Are you using an external crystal or external reference clock source?

Crystal or external reference clock.png

Here is the difference:

clock tools.png

In addition, you can also check if there is a matching errata.

Please check the mask of MCU, make sure the part number is MK10DN512VLL10 not MK10DN512ZVLL10

The codes shown below belong to CLOCK_BootToBlpeMode and CLOCK_SetPbeMode. Did you call these function?

    while ((MCG->S & (MCG_S_IREFST_MASK | MCG_S_CLKST_MASK)) !=
           (MCG_S_IREFST(kMCG_FllSrcExternal) | MCG_S_CLKST(kMCG_ClkOutStatExt)))
    {
    }

Best Regards,
Robin
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