M0518通过看门狗复位系统

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

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

 * [url=home.php?mod=space&uid=895143]@version[/url]  V2.00

 * $Revision: 2 $

 * $Date: 14/12/25 10:24a $

 * @brief

 *           Show how to generate time-out reset system event while WDT time-out reset delay period expired.

 *           

 * @note

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

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

#include <stdio.h>

#include "M0518.h"



#define PLL_CLOCK           50000000





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

/* Global Interface Variables Declarations                                                                 */

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

volatile uint8_t g_u8IsWDTTimeoutINT = 0;





/**

 * [url=home.php?mod=space&uid=247401]@brief[/url]       IRQ Handler for WDT and WWDT Interrupt

 *

 * @param       None

 *

 * [url=home.php?mod=space&uid=266161]@return[/url]      None

 *

 * [url=home.php?mod=space&uid=1543424]@Details[/url]     The WDT_IRQHandler is default IRQ of WDT and WWDT, declared in startup_M0518.s.

 */

void WDT_IRQHandler(void)

{

    if(WDT_GET_TIMEOUT_INT_FLAG() == 1)

    {

        /* Clear WDT time-out interrupt flag */

        WDT_CLEAR_TIMEOUT_INT_FLAG();



        g_u8IsWDTTimeoutINT = 1;

    }

}



void SYS_Init(void)

{

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

    /* Init System Clock                                                                                       */

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

    /* Enable HIRC clock */

    CLK_EnableXtalRC(CLK_PWRCON_IRC22M_EN_Msk);



    /* Waiting for HIRC clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_IRC22M_STB_Msk);



    /* Switch HCLK clock source to HIRC */

    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));



    /* Enable HXT and LIRC */

    CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk | CLK_PWRCON_IRC10K_EN_Msk);



    /* Waiting for clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk | CLK_CLKSTATUS_IRC10K_STB_Msk);



    /* Set core clock as PLL_CLOCK from PLL and SysTick source to HCLK/2*/

    CLK_SetCoreClock(PLL_CLOCK);

    CLK_SetSysTickClockSrc(CLK_CLKSEL0_STCLK_S_HCLK_DIV2);



    /* Enable peripheral clock */

    CLK_EnableModuleClock(UART0_MODULE);

    CLK_EnableModuleClock(WDT_MODULE);



    /* Peripheral clock source */

    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_PLL, CLK_CLKDIV_UART(1));

    CLK_SetModuleClock(WDT_MODULE, CLK_CLKSEL1_WDT_S_LIRC, 0);



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

    /* Init I/O Multi-function                                                                                 */

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

    /* Set PB multi-function pins for UART0 RXD, TXD */

    SYS->GPB_MFP = SYS_GPB_MFP_PB0_UART0_RXD | SYS_GPB_MFP_PB1_UART0_TXD;

}



void UART0_Init(void)

{

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

    /* Init UART                                                                                               */

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

    /* Reset IP */

    SYS_ResetModule(UART0_RST);



    /* Configure UART0 and set UART0 Baudrate */

    UART_Open(UART0, 115200);

}



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

/*  MAIN function                                                                                          */

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

int main(void)

{

    /* Unlock protected registers */

    SYS_UnlockReg();



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

    SYS_Init();



    /* Lock protected registers */

    SYS_LockReg();



    /* Init UART0 for printf */

    UART0_Init();



    if(WDT_GET_RESET_FLAG() == 1)

    {

        /* Use PA.0 to check time-out period time */

        GPIO_SetMode(PA, 0, GPIO_PMD_OUTPUT);

        PA0 = 1;



        WDT_CLEAR_RESET_FLAG();

        printf("*** System has been reset by WDT time-out event ***\n\n");

        while(1);

    }



    printf("CPU [url=home.php?mod=space&uid=72445]@[/url] %d Hz\n", SystemCoreClock);

    printf("+---------------------------------------------+\n");

    printf("|    WDT Time-out Reset System Sample Code    |\n");

    printf("+---------------------------------------------+\n\n");



    printf("# WDT Settings:\n");

    printf("    - Clock source is 10 kHz                \n");

    printf("    - Time-out interval is 2^14 * WDT clock \n");

    printf("      (around 1.6384 second)                \n");

    printf("    - Interrupt enable                      \n");

    printf("    - Reset function enable                 \n");

    printf("    - Reset delay period is 18 * WDT clock  \n");

    printf("# System will generate a WDT time-out interrupt event after around 1.6384 second.\n");

    printf("    (Use PA.0 low period time to check WDT time-out interval)\n");

    printf("# Do not reset WDT counter in WDT_IRQHandler and system will be reset immediately by WDT time-out reset signal.\n\n");



    /* Use PA.0 to check time-out period time */

    GPIO_SetMode(PA, 0, GPIO_PMD_OUTPUT);

    PA0 = 1;

    PA0 = 0;



    /* Because of all bits can be written in WDT Control Register are write-protected;

       To program it needs to disable register protection first. */

    SYS_UnlockReg();



    /* Enable WDT time-out reset function and select time-out interval to 2^14 * WDT clock then start WDT counting */

    g_u8IsWDTTimeoutINT = 0;

    WDT_Open(WDT_TIMEOUT_2POW14, WDT_RESET_DELAY_18CLK, TRUE, FALSE);



    /* Enable WDT interrupt function */

    WDT_EnableInt();



    /* Enable WDT NVIC */

    NVIC_EnableIRQ(WDT_IRQn);



    while(1);

}



/*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/