topic Re: SDK_2.2_LPCXpresso54608 in MCUXpresso SDK

SDK_2.2_LPCXpresso54608

johannzimmerman — Fri, 01 Sep 2017 10:26:16 GMT

Hi all,

has someone already run the CPU with 180Mhz?

If so with what example from the SDK?

Have not found one...

I have the function BOARD_BootClockFROHF96M (); with the
call from BOARD_BootClockPLL180M (); replaced.

BOARD_BootClockPLL180M(); does not change MCU clock.
According to the function SystemCoreClockUpdate();
the variable SystemCoreClock =0 ???
In this case, the MCU is clocked at 48MHz.

What am I doing wrong?

Please help with an example.

Re: SDK_2.2_LPCXpresso54608

soledad — Thu, 07 Sep 2017 19:32:53 GMT

Hi,

Please try the below code:

void BOARD_BootClock180M(void)
{
    /*!< Set up the clock sources */
    /*!< Set up FRO */
    POWER_DisablePD(kPDRUNCFG_PD_FRO_EN);                   /*!< Ensure FRO is on */
    CLOCK_AttachClk(kFRO12M_to_MAIN_CLK);                  /*!< Switch to FRO 12MHz first to ensure we can change voltage without accidentally
                                                                being below the voltage for current speed */
    POWER_SetVoltageForFreq(180000000U);             /*!< Set voltage for the one of the fastest clock outputs: System clock output */
    CLOCK_SetFLASHAccessCyclesForFreq(180000000U);    /*!< Set FLASH wait states for core */
    /*!< Set up SYS PLL */
    const pll_setup_t pllSetup = {
        .syspllctrl = SYSCON_SYSPLLCTRL_SELI(32U) | SYSCON_SYSPLLCTRL_SELP(16U) | SYSCON_SYSPLLCTRL_SELR(0U),
        .syspllndec = (SYSCON_SYSPLLNDEC_NDEC(770U)),
        .syspllpdec = (SYSCON_SYSPLLPDEC_PDEC(98U)),
        .syspllmdec = (SYSCON_SYSPLLMDEC_MDEC(8191U)),
        .pllRate = 180000000U,
        .flags = PLL_SETUPFLAG_WAITLOCK | PLL_SETUPFLAG_POWERUP
    };

    CLOCK_AttachClk(kFRO12M_to_SYS_PLL);        /*!< Set sys pll clock source*/
    CLOCK_SetPLLFreq(&pllSetup);                     /*!< Configure PLL to the desired value */

    /*!< Set up dividers */
    CLOCK_SetClkDiv(kCLOCK_DivAhbClk, 1U, false);                  /*!< Reset divider counter and set divider to value 1 */
    /*!< Set up clock selectors - Attach clocks to the peripheries */
    CLOCK_AttachClk(kSYS_PLL_to_MAIN_CLK);                  /*!< Switch MAIN_CLK to SYS_PLL */
    SYSCON->MAINCLKSELA = ((SYSCON->MAINCLKSELA & ~SYSCON_MAINCLKSELA_SEL_MASK) | SYSCON_MAINCLKSELA_SEL(3U)); /*!< Switch MAINCLKSELA to FRO_HF even it is not used for MAINCLKSELB */
    /* Set SystemCoreClock variable. */
    SystemCoreClock = 180000000;
}

I hope this helps,

Have a great day,
Soledad

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Re: SDK_2.2_LPCXpresso54608

Alex_Tsai — Fri, 08 Sep 2017 03:55:03 GMT

I think the fundamental problem is that CLKIN is define to 0 in system_LPC54608.h

Must be replace to 12000000u

Re: SDK_2.2_LPCXpresso54608

Alex_Tsai — Fri, 08 Sep 2017 06:46:13 GMT

In addition, The SystemCoreClockUpdate() seems to have bugs in line.351

clkRate = workRate / ((uint64_t)postdiv);
clkRate = workRate * 2; /* PLL CCO output is divided by 2 before to M-Divider */

The correct should be ...

clkRate = workRate / ((uint64_t)postdiv);
clkRate = clkRate * 2; /* PLL CCO output is divided by 2 before to M-Divider */

Re: SDK_2.2_LPCXpresso54608

johannzimmerman — Fri, 08 Sep 2017 13:07:28 GMT

Thank you very much for the help. Can confirm that your function works, the MCU switches to 180MHZ.

Re: SDK_2.2_LPCXpresso54608

johannzimmerman — Fri, 08 Sep 2017 13:08:39 GMT

Thank you very much, the change does it.

Re: SDK_2.2_LPCXpresso54608

johannzimmerman — Fri, 08 Sep 2017 13:12:09 GMT

Has anyone already implemented the function BOARD_BootClock220M () for the LPC54628?

Would be very grateful.