clock_config.c

void board_init ( void )

{

    RTC_init();

    CLKSYS_Prescalers_Config( CLK_PSADIV_1_gc, CLK_PSBCDIV_1_1_gc ) ;

    Clock_init();

    exClock_init();

    PLL_init();

    sei();

    PMIC.CTRL |= PMIC_LOLVLEN_bm | PMIC_MEDLVLEN_bm | PMIC_HILVLEN_bm;

    PMIC.INTPRI=0x00;

}

void RTC_init ( void )

{

    OSC.CTRL |= OSC_RC32KEN_bm ;

    while ( ( OSC.STATUS & OSC_RC32KRDY_bm ) == 0) ;

    CLK.RTCCTRL = CLK_RTCSRC_RCOSC_gc | CLK_RTCEN_bm ;

}

void Clock_init ( void )

{

    //OSC.CTRL |= OSC_RC32MEN_bm;

    //while(!(OSC.STATUS & OSC_RC32MRDY_bm));

    //CCP = CCP_IOREG_gc;

    //CLK.CTRL = CLK_SCLKSEL_RC32M_gc;

        // Configure clock to 32MHz

    OSC.CTRL |= OSC_RC32MEN_bm | OSC_RC32KEN_bm;  /* Enable the internal 32MHz & 32KHz oscillators */

    while(!(OSC.STATUS & OSC_RC32KRDY_bm));       /* Wait for 32Khz oscillator to stabilize */

    while(!(OSC.STATUS & OSC_RC32MRDY_bm));       /* Wait for 32MHz oscillator to stabilize */

    DFLLRC32M.CTRL = DFLL_ENABLE_bm ;             /* Enable DFLL - defaults to calibrate against internal 32Khz clock */

    CCP = CCP_IOREG_gc;                           /* Disable register security for clock update */

    CLK.CTRL = CLK_SCLKSEL_RC32M_gc;              /* Switch to 32MHz clock */

    OSC.CTRL &= ~OSC_RC2MEN_bm;                   /* Disable 2Mhz oscillator */

}

void exClock_init ( void )

{

    /*

    OSC_XOSCCTRL = OSC_XOSCSEL_XTAL_16KCLK_gc |

                   OSC_FRQRANGE_12TO16_gc;

    OSC.CTRL |= OSC_XOSCEN_bm;

    while(!(OSC.STATUS & OSC_XOSCRDY_bm));

    CCP = CCP_IOREG_gc;

    CLK.CTRL = CLK_SCLKSEL_XOSC_gc;

    */

    OSC.XOSCCTRL = OSC_FRQRANGE_12TO16_gc | OSC_XOSCSEL_XTAL_256CLK_gc;

    OSC.CTRL |= OSC_XOSCEN_bm;

    while( (OSC.STATUS & OSC_XOSCRDY_bm) == 0){

        //PORTF.OUTTGL = (1<<6);

        //PORTK.OUTTGL = (1<<0); //toggle led   //toggle led

    }

    OSC.PLLCTRL = OSC_PLLSRC_XOSC_gc | (2 << OSC_PLLFAC_gp);

    CLKSYS_Prescalers_Config( CLK_PSADIV_1_gc, CLK_PSBCDIV_1_1_gc ) ;

    OSC.CTRL |= OSC_PLLEN_bm;

    while( (OSC.STATUS & OSC_PLLRDY_bm) == 0){

        //nop

    }

    CLK.CTRL = CLK_SCLKSEL_PLL_gc;

    CLKSYS_Disable(OSC_RC2MEN_bm);

    CLKSYS_Disable(OSC_RC32MEN_bm);

}

void PLL_init ( void )

{

    //OSC.PLLCTRL = OSC_PLLSRC_XOSC_gc | 0x06;

    OSC.PLLCTRL = OSC_PLLSRC_RC32M_gc | 0x04;

    OSC.CTRL |= OSC_PLLEN_bm;

    while (!(OSC.STATUS & OSC_PLLRDY_bm));

    CCP = CCP_IOREG_gc;

    CLK.CTRL = CLK_SCLKSEL_PLL_gc;

}