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

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

 * [url=home.php?mod=space&uid=895143]@version[/url]  V3.00

 * $Revision: 3 $

 * $Date: 15/05/22 2:35p $

 * [url=home.php?mod=space&uid=247401]@brief[/url]    Use WDT time-out interrupt event to wake-up system.

 * @note

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

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

#include <stdio.h>

#include "M051Series.h"



#define PLLCON_SETTING      CLK_PLLCON_50MHz_HXT

#define PLL_CLOCK           50000000





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

/* Global Interface Variables Declarations                                                                 */

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

extern int IsDebugFifoEmpty(void);

volatile uint8_t g_u8IsWDTWakeupINT = 0;





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

/*  Function for System Entry to Power-down Mode                                                           */

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

void PowerDownFunction(void)

{

    printf("System enter to power-down mode.\n\n");



    /* To check if all the debug messages are finished */

    while(IsDebugFifoEmpty() == 0);



    SCB->SCR = 4;



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

    CLK->PWRCON = (CLK->PWRCON & ~(CLK_PWRCON_PWR_DOWN_EN_Msk | CLK_PWRCON_PD_WAIT_CPU_Msk)) |

                  CLK_PWRCON_PD_WAIT_CPU_Msk | CLK_PWRCON_PD_WU_INT_EN_Msk;

    CLK->PWRCON |= CLK_PWRCON_PWR_DOWN_EN_Msk;



    __WFI();

}



/**

 * @brief       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_M051Series.s.

 */

void WDT_IRQHandler(void)

{

    if((WDT_GET_TIMEOUT_INT_FLAG() == 1) && (WDT_GET_TIMEOUT_WAKEUP_FLAG() == 1))

    {

        /* Clear WDT time-out interrupt and wake-up flag */

        WDT_CLEAR_TIMEOUT_INT_FLAG();

        WDT_CLEAR_TIMEOUT_WAKEUP_FLAG();



        g_u8IsWDTWakeupINT = 1;



        printf("WDT time-out wake-up interrupt occurred.\n");

    }

}



void SYS_Init(void)

{

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

    /* Init System Clock                                                                                       */

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

    /* Enable IRC22M clock */

    CLK->PWRCON |= CLK_PWRCON_IRC22M_EN_Msk;



    /* Waiting for IRC22M clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_IRC22M_STB_Msk);



    /* Switch HCLK clock source to HIRC */

    CLK->CLKSEL0 = CLK_CLKSEL0_HCLK_S_HIRC;



    /* Set PLL to Power-down mode and PLL_STB bit in CLKSTATUS register will be cleared by hardware.*/

    CLK->PLLCON |= CLK_PLLCON_PD_Msk;



    /* Enable external 12 MHz XTAL, IRC10K */

    CLK->PWRCON |= CLK_PWRCON_XTL12M_EN_Msk | CLK_PWRCON_OSC10K_EN_Msk;



    /* Enable PLL and Set PLL frequency */

    CLK->PLLCON = PLLCON_SETTING;



    /* Waiting for clock ready */

    CLK_WaitClockReady(CLK_CLKSTATUS_PLL_STB_Msk | CLK_CLKSTATUS_XTL12M_STB_Msk | CLK_CLKSTATUS_IRC10K_STB_Msk);



    /* Switch HCLK clock source to PLL, STCLK to HCLK/2 */

    CLK->CLKSEL0 = CLK_CLKSEL0_STCLK_S_HCLK_DIV2 | CLK_CLKSEL0_HCLK_S_PLL;



    /* Enable peripheral clock */

    CLK->APBCLK = CLK_APBCLK_UART0_EN_Msk | CLK_APBCLK_WDT_EN_Msk;



    /* Peripheral clock source */

    CLK->CLKSEL1 = CLK_CLKSEL1_UART_S_PLL | CLK_CLKSEL1_WDT_S_LIRC;



    /* Update System Core Clock */

    /* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */

    SystemCoreClockUpdate();



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

    /* Init I/O Multi-function                                                                                 */

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

    /* Set P3 multi-function pins for UART0 RXD, TXD */

    SYS->P3_MFP = SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0;

}



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();



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

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

    printf("|    WDT Power-down and Wake-up Sample Code    |\n");

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



    printf("# WDT Settings:\n");

    printf("  Clock source is 10 kHz; Enable interrupt; Enable Wake-up; Time-out interval is 2^16 * WDT clock.\n");

    printf("# When WDT statr counting, system will generate a WDT time-out interrupt after 6.5536 ~ 6.656 s.\n");

    printf("  Measure P0.0 low period to check time-out interval and system can be waken-up by WDT time-out event.\n\n");



    /* Use P0.0 to check time-out period time */

    GPIO_SetMode(P0, 0, GPIO_PMD_OUTPUT);

    P00 = 1;

    P00 = 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 wake-up function and select time-out interval to 2^16 * WDT clock then start WDT counting */

    g_u8IsWDTWakeupINT = 0;

    WDT_Open(WDT_TIMEOUT_2POW16, WDT_RESET_DELAY_1026CLK, FALSE, TRUE);



    /* Enable WDT interrupt function */

    WDT_EnableInt();



    /* Enable WDT NVIC */

    NVIC_EnableIRQ(WDT_IRQn);



    /* System entry into Power-down Mode */

    PowerDownFunction();



    /* Check if WDT time-out interrupt and wake-up interrupt flag occurred */

    while(1)

    {

        if(((CLK->PWRCON & CLK_PWRCON_PD_WU_STS_Msk) == CLK_PWRCON_PD_WU_STS_Msk) && (g_u8IsWDTWakeupINT == 1))

            break;

    }



    P00 = 1;



    /* Clear Power-down wake-up interrupt flag */

    CLK->PWRCON |= CLK_PWRCON_PD_WU_STS_Msk;



    /* Disable WDT counting */

    WDT_Close();



    while(1);

}



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