/*************************************************************************//**
 * @file     main.c
 * @version  V1.00
 * $Revision: 1 $
 * $Date: 14/09/15 2:23p $
 * @brief    Use Polling mode to check WDT time-out state and reset WDT after time-out occurs.
 *
 * @note
 * Copyright (C) 2013-2014 Nuvoton Technology Corp. All rights reserved.
 *****************************************************************************/
#include <stdio.h>
#include "Nano100Series.h"


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_PB1_MFP_UART0_TX | SYS_PB_L_MFP_PB0_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 in polling 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, disable wake up system
    WDT_Open(WDT_TIMEOUT_2POW14, 0, FALSE, FALSE);

    while(1)
    {
        // WDT timeout flag set
        if(WDT_GET_TIMEOUT_INT_FLAG())
        {
            // Reset WDT and clear time out flag
            WDT_CLEAR_TIMEOUT_INT_FLAG();
            printf("Reset WDT counter\n");
        }
    }

}

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


