NANO112系列的看门狗唤醒

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

 * [url=home.php?mod=space&uid=288409]@file[/url]     main.c

 * [url=home.php?mod=space&uid=895143]@version[/url]  V1.00

 * $Revision: 3 $

 * $Date: 14/11/25 1:06p $

 * [url=home.php?mod=space&uid=247401]@brief[/url]    Use WDT to wake up system from Power-down mode periodically.

 *

 * @note

 * Copyright (C) 2013-2014 Nuvoton Technology Corp. All rights reserved.

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

#include <stdio.h>

#include "Nano1x2Series.h"





void WDT_IRQHandler(void)

{



    // Clear WDT interrupt flag

    WDT_CLEAR_TIMEOUT_INT_FLAG();



    // Check WDT wake up flag

    if(WDT_GET_TIMEOUT_WAKEUP_FLAG()) {

        printf("Wake up by WDT\n");

        // Clear WDT wake up flag

        WDT_CLEAR_TIMEOUT_WAKEUP_FLAG();

    }



}





void SYS_Init(void)

{



    /*---------------------------------------------------------------------------------------------------------*/

    /* Init System Clock                                                                                       */

    /*---------------------------------------------------------------------------------------------------------*/

    /* Unlock protected registers */

    SYS_UnlockReg();



    /* Enable External XTAL (4~24 MHz) */

    CLK_EnableXtalRC(CLK_PWRCTL_HXT_EN_Msk);



    /* Enable LIRC */

    CLK_EnableXtalRC(CLK_PWRCTL_LIRC_EN_Msk);



    /* Waiting for 12MHz clock ready */

    CLK_WaitClockReady( CLK_CLKSTATUS_HXT_STB_Msk);



    /* Waiting for LIRC clock ready */

    CLK_WaitClockReady( CLK_CLKSTATUS_LIRC_STB_Msk);



    /* Switch HCLK clock source to HXT */

    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HXT,CLK_HCLK_CLK_DIVIDER(1));



    /* Enable IP clock */

    CLK_EnableModuleClock(UART0_MODULE);

    CLK_EnableModuleClock(WDT_MODULE);





    /* Select IP clock source */

    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_UART_CLK_DIVIDER(1));

    CLK_SetModuleClock(WDT_MODULE, 0, 0);



    /* Update System Core Clock */

    /* User can use SystemCoreClockUpdate() to calculate SystemCoreClock. */

    SystemCoreClockUpdate();





    /*---------------------------------------------------------------------------------------------------------*/

    /* Init I/O Multi-function                                                                                 */

    /*---------------------------------------------------------------------------------------------------------*/

    /* Set GPB multi-function pins for UART0 RXD and TXD */

    SYS->PB_L_MFP &= ~(SYS_PB_L_MFP_PB0_MFP_Msk | SYS_PB_L_MFP_PB1_MFP_Msk);

    SYS->PB_L_MFP |= (SYS_PB_L_MFP_PB0_MFP_UART0_TX | SYS_PB_L_MFP_PB1_MFP_UART0_RX);

    /* Lock protected registers */

    SYS_LockReg();



}





int32_t main (void)

{

    /* Init System, IP clock and multi-function I/O

       In the end of SYS_Init() will issue SYS_LockReg()

       to lock protected register. If user want to write

       protected register, please issue SYS_UnlockReg()

       to unlock protected register if necessary */

    SYS_Init();



    /* Init UART to 115200-8n1 for print message */

    UART_Open(UART0, 115200);



    printf("\nThis sample code demonstrate using WDT to wake system up from power down mode\n");



    // WDT register is locked, so it is necessary to unlock protect register before configure WDT

    SYS_UnlockReg();



    // WDT timeout every 2^14 WDT clock, disable system reset, enable wake up system

    WDT_Open(WDT_TIMEOUT_2POW14, 0, FALSE, TRUE);



    // Enable WDT timeout interrupt

    WDT_EnableInt();

    NVIC_EnableIRQ(WDT_IRQn);



    while(1) {

        // Wait 'til UART FIFO empty to get a cleaner console out

        while(!UART_IS_TX_EMPTY(UART0));

        CLK_PowerDown();

    }



}



/*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/