/**************************************************************************//**
 * @file     main.c
 * @version  V3.00
 * $Revision: 4 $
 * $Date: 15/02/06 10:22a $
 * @brief    Show how to wake up system from Power-down mode by GPIO interrupt.
 * @note
 * @copyright SPDX-License-Identifier: Apache-2.0
 * @copyright Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
 ******************************************************************************/
#include <stdio.h>
#include "M058S.h"


#define PLL_CLOCK           50000000


/*---------------------------------------------------------------------------------------------------------*/
/*  Function for System Entry to Power Down Mode                                                           */
/*---------------------------------------------------------------------------------------------------------*/
void PowerDownFunction(void)
{
    uint32_t u32TimeOutCnt;

    /* Check if all the debug messages are finished */
    u32TimeOutCnt = SystemCoreClock; /* 1 second time-out */
    UART_WAIT_TX_EMPTY(UART0)
        if(--u32TimeOutCnt == 0) break;

    /* Enter to Power-down mode */
    CLK_PowerDown();
}

/**
 * @brief       Port0/Port1 IRQ
 *
 * @param       None
 *
 * @return      None
 *
 * @details     The Port0/Port1 default IRQ, declared in startup_M058S.s.
 */
void GPIOP0P1_IRQHandler(void)
{
    /* To check if P1.3 interrupt occurred */
    if(GPIO_GET_INT_FLAG(P1, BIT3))
    {
        GPIO_CLR_INT_FLAG(P1, BIT3);
        printf("P1.3 INT occurred.\n");
    }
    else
    {
        /* Un-expected interrupt. Just clear all PORT0, PORT1 interrupts */
        P0->ISRC = P0->ISRC;
        P1->ISRC = P1->ISRC;
        printf("Un-expected interrupts.\n");
    }
}

/**
 * @brief       Port6/Port7 IRQ
 *
 * @param       None
 *
 * @return      None
 *
 * @details     The Port6/Port7 default IRQ, declared in startup_M058S.s.
 */
void GPIOP6P7_IRQHandler(void)
{
    /* To check if P6.2 interrupt occurred */
    if(GPIO_GET_INT_FLAG(P6, BIT2))
    {
        GPIO_CLR_INT_FLAG(P6, BIT2);
        printf("P6.2 INT occurred.\n");
    }
    else
    {
        /* Un-expected interrupt. Just clear all PORT6, PORT7 interrupts */
        P6->ISRC = P6->ISRC;
        P7->ISRC = P7->ISRC;
        printf("Un-expected interrupts.\n");
    }
}

void SYS_Init(void)
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init System Clock                                                                                       */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Enable Internal RC 22.1184MHz clock */
    CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);

    /* Waiting for Internal RC clock ready */
    CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);

    /* Switch HCLK clock source to Internal RC and HCLK source divide 1 */
    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));

    /* Enable external XTAL 12MHz clock */
    CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);

    /* Waiting for external XTAL clock ready */
    CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk);

    /* Set core clock as PLL_CLOCK from PLL */
    CLK_SetCoreClock(PLL_CLOCK);

    /* Enable UART module clock */
    CLK_EnableModuleClock(UART0_MODULE);

    /* Select UART module clock source */
    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_PLL, CLK_CLKDIV_UART(1));

    /*---------------------------------------------------------------------------------------------------------*/
    /* Init I/O Multi-function                                                                                 */
    /*---------------------------------------------------------------------------------------------------------*/

    /* Set P3 multi-function pins for UART0 RXD and TXD */
    SYS->P3_MFP &= ~(SYS_MFP_P30_Msk | SYS_MFP_P31_Msk);
    SYS->P3_MFP |= (SYS_MFP_P30_RXD | SYS_MFP_P31_TXD);

}

void UART0_Init(void)
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init UART                                                                                               */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Reset UART0 */
    SYS_ResetModule(UART0_RST);

    /* Configure UART0 and set UART0 Baudrate */
    UART_Open(UART0, 115200);
}

/*---------------------------------------------------------------------------------------------------------*/
/* MAIN function                                                                                           */
/*---------------------------------------------------------------------------------------------------------*/
int32_t 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 @ %d Hz\n", SystemCoreClock);
    printf("+---------------------------------------------------------------+\n");
    printf("|    GPIO Power-Down and Wake-up by P1.3 or P6.2 Sample Code    |\n");
    printf("+---------------------------------------------------------------+\n\n");

    /* Configure P1.3 as Input mode and enable interrupt by rising edge trigger */
    GPIO_SetMode(P1, BIT3, GPIO_PMD_INPUT);
    GPIO_EnableInt(P1, 3, GPIO_INT_RISING);
    NVIC_EnableIRQ(GPIO_P0P1_IRQn);

    /* Configure P6.2 as Input mode and enable interrupt by falling edge trigger */
    GPIO_SetMode(P6, BIT2, GPIO_PMD_INPUT);
    GPIO_EnableInt(P6, 2, GPIO_INT_FALLING);
    NVIC_EnableIRQ(GPIO_P6P7_IRQn);

    /* Enable interrupt de-bounce function and select de-bounce sampling cycle time is 1024 clocks of LIRC clock */
    GPIO_SET_DEBOUNCE_TIME(GPIO_DBCLKSRC_LIRC, GPIO_DBCLKSEL_1024);
    GPIO_ENABLE_DEBOUNCE(P1, BIT3);
    GPIO_ENABLE_DEBOUNCE(P6, BIT2);

    /* Unlock protected registers before entering Power-down mode */
    SYS_UnlockReg();

    /* Waiting for P1.3 rising-edge or P6.2 falling-edge interrupt event */
    while(1)
    {
        printf("Enter to Power-Down ......\n");

        /* Enter to Power-down mode */
        PowerDownFunction();

        printf("System waken-up done.\n\n");
    }

}

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