source: asp_wio_terminal/trunk/target/samd51_gcc/lib/plib_clock.c

/*******************************************************************************
 CLOCK PLIB

  Company:
    Microchip Technology Inc.

  File Name:
    plib_clock.c

  Summary:
    CLOCK PLIB Implementation File.

  Description:
    None

*******************************************************************************/

/*******************************************************************************
* Copyright (C) 2018 Microchip Technology Inc. and its subsidiaries.
*
* Subject to your compliance with these terms, you may use Microchip software
* and any derivatives exclusively with Microchip products. It is your
* responsibility to comply with third party license terms applicable to your
* use of third party software (including open source software) that may
* accompany Microchip software.
*
* THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES, WHETHER
* EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, INCLUDING ANY IMPLIED
* WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE,
* INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND
* WHATSOEVER RELATED TO THE SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS
* BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE
* FULLEST EXTENT ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN
* ANY WAY RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
* THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
*******************************************************************************/

#include "plib_clock.h"
#include "atsamd51p19a.h"

static void OSCCTRL_Initialize(void)
{

    /****************** XOSC1 Initialization   ********************************/

    /* Configure External Oscillator */
    OSCCTRL_REGS->OSCCTRL_XOSCCTRL[1] = OSCCTRL_XOSCCTRL_STARTUP(0) | OSCCTRL_XOSCCTRL_IMULT(6) | OSCCTRL_XOSCCTRL_IPTAT(3) | OSCCTRL_XOSCCTRL_XTALEN_Msk | OSCCTRL_XOSCCTRL_ENABLE_Msk;

    while((OSCCTRL_REGS->OSCCTRL_STATUS & OSCCTRL_STATUS_XOSCRDY1_Msk) != OSCCTRL_STATUS_XOSCRDY1_Msk)
    {
        /* Waiting for the XOSC Ready state */
    }
}

static void OSC32KCTRL_Initialize(void)
{
    /****************** XOSC32K initialization  ******************************/

    /* Configure 32K External Oscillator */
    OSC32KCTRL_REGS->OSC32KCTRL_XOSC32K = OSC32KCTRL_XOSC32K_STARTUP(2) | OSC32KCTRL_XOSC32K_ENABLE_Msk | OSC32KCTRL_XOSC32K_CGM(1) | OSC32KCTRL_XOSC32K_EN32K_Msk | OSC32KCTRL_XOSC32K_XTALEN_Msk;


    while(!((OSC32KCTRL_REGS->OSC32KCTRL_STATUS & OSC32KCTRL_STATUS_XOSC32KRDY_Msk) == OSC32KCTRL_STATUS_XOSC32KRDY_Msk))
    {
        /* Waiting for the XOSC32K Ready state */
    }

    OSC32KCTRL_REGS->OSC32KCTRL_RTCCTRL = OSC32KCTRL_RTCCTRL_RTCSEL(0);
}

static void FDPLL0_Initialize(void)
{
    GCLK_REGS->GCLK_PCHCTRL[1] = GCLK_PCHCTRL_GEN(0x2)  | GCLK_PCHCTRL_CHEN_Msk;
    while ((GCLK_REGS->GCLK_PCHCTRL[1] & GCLK_PCHCTRL_CHEN_Msk) != GCLK_PCHCTRL_CHEN_Msk)
    {
        /* Wait for synchronization */
    }

    /****************** DPLL0 Initialization  *********************************/

    /* Configure DPLL    */
    OSCCTRL_REGS->DPLL[0].OSCCTRL_DPLLCTRLB = OSCCTRL_DPLLCTRLB_FILTER(0) | OSCCTRL_DPLLCTRLB_LTIME(0x0)| OSCCTRL_DPLLCTRLB_REFCLK(0) ;


    OSCCTRL_REGS->DPLL[0].OSCCTRL_DPLLRATIO = OSCCTRL_DPLLRATIO_LDRFRAC(0) | OSCCTRL_DPLLRATIO_LDR(199);

    while((OSCCTRL_REGS->DPLL[0].OSCCTRL_DPLLSYNCBUSY & OSCCTRL_DPLLSYNCBUSY_DPLLRATIO_Msk) == OSCCTRL_DPLLSYNCBUSY_DPLLRATIO_Msk)
    {
        /* Waiting for the synchronization */
    }

    /* Enable DPLL */
    OSCCTRL_REGS->DPLL[0].OSCCTRL_DPLLCTRLA = OSCCTRL_DPLLCTRLA_ENABLE_Msk   ;

    while((OSCCTRL_REGS->DPLL[0].OSCCTRL_DPLLSYNCBUSY & OSCCTRL_DPLLSYNCBUSY_ENABLE_Msk) == OSCCTRL_DPLLSYNCBUSY_ENABLE_Msk )
    {
        /* Waiting for the DPLL enable synchronization */
    }

    while((OSCCTRL_REGS->DPLL[0].OSCCTRL_DPLLSTATUS & (OSCCTRL_DPLLSTATUS_LOCK_Msk | OSCCTRL_DPLLSTATUS_CLKRDY_Msk)) !=
                (OSCCTRL_DPLLSTATUS_LOCK_Msk | OSCCTRL_DPLLSTATUS_CLKRDY_Msk))
    {
        /* Waiting for the Ready state */
    }
}

static void FDPLL1_Initialize(void)
{
    GCLK_REGS->GCLK_PCHCTRL[2] = GCLK_PCHCTRL_GEN(0x2)  | GCLK_PCHCTRL_CHEN_Msk;
    while ((GCLK_REGS->GCLK_PCHCTRL[1] & GCLK_PCHCTRL_CHEN_Msk) != GCLK_PCHCTRL_CHEN_Msk)
    {
        /* Wait for synchronization */
    }

    /****************** DPLL1 Initialization  *********************************/

    /* Configure DPLL    */
    OSCCTRL_REGS->DPLL[1].OSCCTRL_DPLLCTRLB = OSCCTRL_DPLLCTRLB_FILTER(0) | OSCCTRL_DPLLCTRLB_LTIME(0x0)| OSCCTRL_DPLLCTRLB_REFCLK(0) ;


    OSCCTRL_REGS->DPLL[1].OSCCTRL_DPLLRATIO = OSCCTRL_DPLLRATIO_LDRFRAC(0) | OSCCTRL_DPLLRATIO_LDR(159);

    while((OSCCTRL_REGS->DPLL[1].OSCCTRL_DPLLSYNCBUSY & OSCCTRL_DPLLSYNCBUSY_DPLLRATIO_Msk) == OSCCTRL_DPLLSYNCBUSY_DPLLRATIO_Msk)
    {
        /* Waiting for the synchronization */
    }

    /* Enable DPLL */
    OSCCTRL_REGS->DPLL[1].OSCCTRL_DPLLCTRLA = OSCCTRL_DPLLCTRLA_ENABLE_Msk   ;

    while((OSCCTRL_REGS->DPLL[1].OSCCTRL_DPLLSYNCBUSY & OSCCTRL_DPLLSYNCBUSY_ENABLE_Msk) == OSCCTRL_DPLLSYNCBUSY_ENABLE_Msk )
    {
        /* Waiting for the DPLL enable synchronization */
    }

    while((OSCCTRL_REGS->DPLL[1].OSCCTRL_DPLLSTATUS & (OSCCTRL_DPLLSTATUS_LOCK_Msk | OSCCTRL_DPLLSTATUS_CLKRDY_Msk)) !=
                (OSCCTRL_DPLLSTATUS_LOCK_Msk | OSCCTRL_DPLLSTATUS_CLKRDY_Msk))
    {
        /* Waiting for the Ready state */
    }
}

static void DFLL_Initialize(void)
{
}


static void GCLK0_Initialize(void)
{
    
    /* selection of the CPU clock Division */
    MCLK_REGS->MCLK_CPUDIV = MCLK_CPUDIV_DIV(0x01);

    while((MCLK_REGS->MCLK_INTFLAG & MCLK_INTFLAG_CKRDY_Msk) != MCLK_INTFLAG_CKRDY_Msk)
    {
        /* Wait for the Main Clock to be Ready */
    }
    GCLK_REGS->GCLK_GENCTRL[0] = GCLK_GENCTRL_DIV(1) | GCLK_GENCTRL_SRC(7) | GCLK_GENCTRL_GENEN_Msk;

    while((GCLK_REGS->GCLK_SYNCBUSY & GCLK_SYNCBUSY_GENCTRL_GCLK0) == GCLK_SYNCBUSY_GENCTRL_GCLK0)
    {
        /* wait for the Generator 0 synchronization */
    }
}

static void GCLK1_Initialize(void)
{
    GCLK_REGS->GCLK_GENCTRL[1] = GCLK_GENCTRL_DIV(2) | GCLK_GENCTRL_SRC(7) | GCLK_GENCTRL_GENEN_Msk;

    while((GCLK_REGS->GCLK_SYNCBUSY & GCLK_SYNCBUSY_GENCTRL_GCLK1) == GCLK_SYNCBUSY_GENCTRL_GCLK1)
    {
        /* wait for the Generator 1 synchronization */
    }
}

static void GCLK2_Initialize(void)
{
    GCLK_REGS->GCLK_GENCTRL[2] = GCLK_GENCTRL_DIV(32) | GCLK_GENCTRL_SRC(1) | GCLK_GENCTRL_GENEN_Msk;

    while((GCLK_REGS->GCLK_SYNCBUSY & GCLK_SYNCBUSY_GENCTRL_GCLK2) == GCLK_SYNCBUSY_GENCTRL_GCLK2)
    {
        /* wait for the Generator 2 synchronization */
    }
}

static void GCLK3_Initialize(void)
{
    GCLK_REGS->GCLK_GENCTRL[3] = GCLK_GENCTRL_DIV(1) | GCLK_GENCTRL_SRC(8) | GCLK_GENCTRL_GENEN_Msk;

    while((GCLK_REGS->GCLK_SYNCBUSY & GCLK_SYNCBUSY_GENCTRL_GCLK3) == GCLK_SYNCBUSY_GENCTRL_GCLK3)
    {
        /* wait for the Generator 3 synchronization */
    }
}

void CLOCK_Initialize (void)
{
    /* Function to Initialize the Oscillators */
    OSCCTRL_Initialize();

    /* Function to Initialize the 32KHz Oscillators */
    OSC32KCTRL_Initialize();

    DFLL_Initialize();
    GCLK2_Initialize();
    FDPLL0_Initialize();
    FDPLL1_Initialize();
    GCLK0_Initialize();
    GCLK1_Initialize();
    GCLK3_Initialize();



    /* Selection of the Generator and write Lock for SERCOM2_CORE */
    GCLK_REGS->GCLK_PCHCTRL[23] = GCLK_PCHCTRL_GEN(0x1)  | GCLK_PCHCTRL_CHEN_Msk;

    while ((GCLK_REGS->GCLK_PCHCTRL[23] & GCLK_PCHCTRL_CHEN_Msk) != GCLK_PCHCTRL_CHEN_Msk)
    {
        /* Wait for synchronization */
    }
    /* Selection of the Generator and write Lock for SERCOM7_CORE */
    GCLK_REGS->GCLK_PCHCTRL[37] = GCLK_PCHCTRL_GEN(0x3)  | GCLK_PCHCTRL_CHEN_Msk;

    while ((GCLK_REGS->GCLK_PCHCTRL[37] & GCLK_PCHCTRL_CHEN_Msk) != GCLK_PCHCTRL_CHEN_Msk)
    {
        /* Wait for synchronization */
    }

    /* Configure the AHB Bridge Clocks */
    MCLK_REGS->MCLK_AHBMASK = 0xffffff;

    /* Configure the APBA Bridge Clocks */
    MCLK_REGS->MCLK_APBAMASK = 0x7ff;

    /* Configure the APBB Bridge Clocks */
    MCLK_REGS->MCLK_APBBMASK = 0x18256;

    /* Configure the APBD Bridge Clocks */
    MCLK_REGS->MCLK_APBDMASK = 0x8;


}