Order to turn on the crystal oscillator and setup to run on PLL0

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Order to turn on the crystal oscillator and setup to run on PLL0

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Contributor III

Hi,

I wanted to know what are the correct order of setup to utilize the crystal oscillator and the PLL0 on LPC55S69.

My code looks like this

 //Declarations
 pll_setup_t pll0_setup;
 pll_config_t pll0_config;
 pll_error_t pll0_error;
   // Init board hardware.
    BOARD_InitBootPins();
    BOARD_InitBootClocks();
    BOARD_InitBootPeripherals();
   // Init FSL debug console.
    BOARD_InitDebugConsole();
    // Setting up the Clock to run from external oscillator and PLL0
 CLOCK_AttachClk(kFRO_HF_to_CTIMER0);
    CLOCK_AttachClk(kEXT_CLK_to_PLL0);
 pll0_config.desiredRate = 96000000;
 pll0_config.flags = PLL_CONFIGFLAG_FORCENOFRACT;
    pll0_error = CLOCK_SetupPLL0Data(&pll0_config, &pll0_setup);
    if (!pll0_error){
     while(1);
    }
    pll0_error = CLOCK_SetupPLL0Prec(&pll0_setup, PLL_SETUPFLAG_WAITLOCK);
    if (!pll0_error){
         while(1);
    }
    CLOCK_AttachClk(kPLL0_to_CTIMER0);
    CLOCK_AttachClk(kPLL0_to_MAIN_CLK);
    PRINTF("Configuring Timer 0...\n");

Is this correct?

Regards, 

Safi 

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2 Replies

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NXP Employee
NXP Employee

Hi, 

I'd highly recommend you to use the MCUXpresso Config Tool to configure the clock, as the tool provides a graphical interaction interface to help the developer to do it.

MCUXpresso Config Tools|Software Development for NXP Microcontrollers (MCUs)|NXP

Have a great day,
Sol

 

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27 Views
Contributor III

Thanks soledad,

The tool is really helpful.

Regards,

Safi

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