How to setup clock from external crystal on K64F and KSDK2.1

mastupristi — Mon, 02 Nov 2020 13:51:34 GMT

I'm porting a firmware running on a custom board from KSDK 1.3 to KSDK 2.1. I use Kinetis MK64FN1M0VLQ12 clocked with a 12.288 MHz crystal. With KSDK 1.3 the firmware works fine. With KSDK 2.1 I am not able to correctly setup clock.

void BOARD_BootClockRUN(void)
{
    /*
    * Core clock: 119.808MHz
    * Bus clock: 59.904MHz
    */
    const mcg_pll_config_t pll0Config = {
        .enableMode = 0U,
        .prdiv = 0x03U,        // divide by 4
        .vdiv = 0x0fU,        // multiply by 39
    };
    const sim_clock_config_t simConfig = {
        .pllFllSel = 1U,        /* PLLFLLSEL select PLL. */
        .er32ksrc=2U,         /* ERCLK32K selection, use RTC. */
        .clkdiv1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(1) | SIM_CLKDIV1_OUTDIV3(2) | SIM_CLKDIV1_OUTDIV4(4),
    };

    CLOCK_SetSimSafeDivs();
    BOARD_InitOsc0();

    CLOCK_BootToPeeMode(kMCG_OscselOsc, kMCG_PllClkSelPll0, &pll0Config);

    CLOCK_SetInternalRefClkConfig(kMCG_IrclkEnable, kMCG_IrcSlow, 0);
    CLOCK_SetSimConfig(&simConfig);

    SystemCoreClock = 119808000U;    // 12288000/4 * 39
}

void BOARD_InitOsc0(void)
{
    const osc_config_t oscConfig = {.freq = BOARD_XTAL0_CLK_HZ,
                                    .capLoad = 0,
                                    .workMode = kOSC_ModeOscHighGain,
                                    .oscerConfig = {
                                        .enableMode = kOSC_ErClkEnable,
#if (defined(FSL_FEATURE_OSC_HAS_EXT_REF_CLOCK_DIVIDER) && FSL_FEATURE_OSC_HAS_EXT_REF_CLOCK_DIVIDER)
                                        .erclkDiv = 0U,
#endif
                                    }};

    CLOCK_InitOsc0(&oscConfig);

    /* Passing the XTAL0 frequency to clock driver. */
    CLOCK_SetXtal0Freq(BOARD_XTAL0_CLK_HZ);
}

firmware hangs in CLOCK_BootToPeeMode().

I want to make this clock path:

where am I wrong?

best regards

Max

Re: How to setup clock from external crystal on K64F and KSDK2.1

MarekTrmac — Mon, 06 Mar 2017 08:32:51 GMT

Hi Max,

there is available Clocks tool on http://mcuxpresso.nxp.com/ that can generate clock tool initialization code for you. This might help. The tool is available both as WEB version and also as DESKTOP version.

Regards

Marek

Kinetis Software Development KitのトピックRe: How to setup clock from external crystal on K64F and KSDK2.1

How to setup clock from external crystal on K64F and KSDK2.1

Re: How to setup clock from external crystal on K64F and KSDK2.1