/**************************************************************************//**
 * @file     main.c
 * @version  V3.00
 * $Revision: 1 $
 * $Date: 14/10/01 10:34a $
 * @brief    NUC029 Series GPIO Driver Sample Code
 *
 * @note
 * @copyright SPDX-License-Identifier: Apache-2.0
 * @copyright Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
 ******************************************************************************/
#include <stdio.h>
#include "NUC029xAN.h"


#define PLL_CLOCK           50000000


/**
 * @brief       External INT0 IRQ
 *
 * @param       None
 *
 * @return      None
 *
 * @details     The External INT0(P3.2) default IRQ, declared in startup_NUC029xAN.s.
 */
void EINT0_IRQHandler(void)
{
    /* For P3.2, clear the INT flag */
    GPIO_CLR_INT_FLAG(P3, BIT2);

    printf("P3.2 EINT0 occurred.\n");
}

/**
 * @brief       External INT1 IRQ
 *
 * @param       None
 *
 * @return      None
 *
 * @details     The External INT1(P3.3) default IRQ, declared in startup_NUC029xAN.s.
 */
void EINT1_IRQHandler(void)
{
    /* For P3.3, clear the INT flag */
    GPIO_CLR_INT_FLAG(P3, BIT3);

    printf("P3.3 EINT1 occurred.\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, TXD, EINT0 and EINT1 */
    SYS->P3_MFP &= ~(SYS_MFP_P30_Msk | SYS_MFP_P31_Msk | SYS_MFP_P32_Msk | SYS_MFP_P33_Msk);
    SYS->P3_MFP |= (SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0 | SYS_MFP_P32_INT0 | SYS_MFP_P33_INT1);

}

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 EINT0/EINT1 Interrupt and De-bounce Sample Code    |\n");
    printf("+------------------------------------------------------------+\n\n");

    /*-----------------------------------------------------------------------------------------------------*/
    /* GPIO External Interrupt Function Test                                                               */
    /*-----------------------------------------------------------------------------------------------------*/
    printf("EINT0(P3.2) and EINT1(P3.3) are used to test interrupt \n");

    /* Configure P3.2 as EINT0 pin and enable interrupt by falling edge trigger */
    GPIO_SetMode(P3, BIT2, GPIO_PMD_INPUT);
    GPIO_EnableEINT0(P3, 2, GPIO_INT_FALLING);
    NVIC_EnableIRQ(EINT0_IRQn);

    /* Configure P3.3 as EINT1 pin and enable interrupt by rising and falling edge trigger */
    GPIO_SetMode(P3, BIT3, GPIO_PMD_INPUT);
    GPIO_EnableEINT1(P3, 3, GPIO_INT_BOTH_EDGE);
    NVIC_EnableIRQ(EINT1_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(P3, BIT2 | BIT3);

    /* Waiting for interrupts */
    while(1);
}

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